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session-android-service is merged under the "service" module.

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This commit is contained in:
Anton Chekulaev 2020-11-24 15:22:02 +11:00
parent 9052431bf8
commit 1c5e62a2de
358 changed files with 103885 additions and 25 deletions
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10
build.gradle
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@ -7,9 +7,9 @@ buildscript {
}
dependencies {
classpath "com.android.tools.build:gradle:4.0.1"
classpath files('libs/gradle-witness.jar')
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion"
classpath "com.google.gms:google-services:4.3.3"
classpath files('libs/gradle-witness.jar')
}
}
@ -56,4 +56,10 @@ allprojects {
jcenter()
maven { url "https://jitpack.io" }
}
project.ext {
androidBuildToolsVersion = '29.0.3'
androidCompileSdkVersion = 29
androidMinSdkVersion = 21
}
}

8
gradle.properties
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@ -2,5 +2,9 @@ android.useAndroidX=true
android.enableJetifier=true
org.gradle.jvmargs=-Xmx2048m
kotlin_version=1.4.0
kovenant_version=3.3.0
kotlinVersion=1.4.0
kovenantVersion=3.3.0
curve25519Version=0.5.0
protobufVersion=2.5.0
okhttpVersion=3.12.1
jacksonDatabindVersion=2.9.8

34
messenger/build.gradle
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@ -93,18 +93,18 @@ dependencies {
}
// Loki
// Local:
implementation "org.whispersystems:signal-service-android:2.13.2" // Run ./gradlew install from session-android-service to install
implementation "org.whispersystems:curve25519-java:0.5.0"
implementation project(":service:android")
// Remote:
implementation "org.whispersystems:curve25519-java:$curve25519Version"
implementation "com.goterl.lazycode:lazysodium-android:4.2.0@aar"
implementation "net.java.dev.jna:jna:5.5.0@aar"
implementation "com.google.protobuf:protobuf-java:2.5.0"
implementation "com.fasterxml.jackson.core:jackson-databind:2.9.8"
implementation "com.squareup.okhttp3:okhttp:3.12.1"
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
implementation "com.google.protobuf:protobuf-java:$protobufVersion"
implementation "com.fasterxml.jackson.core:jackson-databind:$jacksonDatabindVersion"
implementation "com.squareup.okhttp3:okhttp:$okhttpVersion"
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlinVersion"
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.9'
implementation "nl.komponents.kovenant:kovenant:$kovenant_version"
implementation "nl.komponents.kovenant:kovenant-android:$kovenant_version"
implementation "nl.komponents.kovenant:kovenant:$kovenantVersion"
implementation "nl.komponents.kovenant:kovenant-android:$kovenantVersion"
implementation "com.github.lelloman:android-identicons:v11"
implementation "com.prof.rssparser:rssparser:2.0.4"
implementation "com.jakewharton.rxbinding3:rxbinding:3.1.0"
@ -147,8 +147,8 @@ def abiPostFix = ['armeabi-v7a' : 1,
android {
flavorDimensions "none"
compileSdkVersion 29
buildToolsVersion '29.0.3'
compileSdkVersion androidCompileSdkVersion
buildToolsVersion androidBuildToolsVersion
useLibrary 'org.apache.http.legacy'
dexOptions {
@ -159,8 +159,9 @@ android {
versionCode canonicalVersionCode * postFixSize
versionName canonicalVersionName
minSdkVersion 21
targetSdkVersion 29
minSdkVersion androidMinSdkVersion
targetSdkVersion androidCompileSdkVersion
multiDexEnabled true // Even though we're running API 21+, this is still needed for release builds
vectorDrawables.useSupportLibrary = true
@ -310,15 +311,6 @@ android {
buildFeatures {
dataBinding true
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = '1.8'
}
}
/*

10
service/.editorconfig Normal file
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@ -0,0 +1,10 @@
# indicate this is the root of the project
root = true
[*.{kt,java,xml,gradle,md}]
charset = utf-8
indent_style = space
indent_size = 4
trim_trailing_whitespace = true
insert_final_newline = true
end_of_line = lf

674
service/LICENSE Normal file
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@ -0,0 +1,674 @@
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the GNU General Public License from time to time. Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.
Each version is given a distinguishing version number. If the
Program specifies that a certain numbered version of the GNU General
Public License "or any later version" applies to it, you have the
option of following the terms and conditions either of that numbered
version or of any later version published by the Free Software
Foundation. If the Program does not specify a version number of the
GNU General Public License, you may choose any version ever published
by the Free Software Foundation.
If the Program specifies that a proxy can decide which future
versions of the GNU General Public License can be used, that proxy's
public statement of acceptance of a version permanently authorizes you
to choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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apply plugin: 'com.android.library'
apply plugin: 'maven'
apply plugin: 'signing'
archivesBaseName = "signal-service-android"
version = versionNumber
group = groupName
repositories {
mavenLocal()
google()
jcenter()
mavenCentral()
}
configurations.all {
resolutionStrategy.cacheChangingModulesFor 0, 'seconds'
}
dependencies {
api (project(':service:java')) {
exclude group: 'org.signal', module: 'signal-metadata-java'
exclude group: 'org.apache.httpcomponents', module: 'httpclient'
}
}
android {
compileSdkVersion androidCompileSdkVersion
buildToolsVersion androidBuildToolsVersion
defaultConfig {
minSdkVersion androidMinSdkVersion
targetSdkVersion androidCompileSdkVersion
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
libraryVariants.all { variant ->
variant.outputs.each { output ->
def outputFile = output.outputFile
if (outputFile != null && outputFile.name.endsWith('.aar')) {
def fileName = "${archivesBaseName}-${version}.aar"
output.outputFileName = fileName
}
}
}
}
tasks.whenTaskAdded { task ->
if (task.name.equals("lint")) {
task.enabled = false
}
}
def isReleaseBuild() {
return version.contains("SNAPSHOT") == false
}
def getReleaseRepositoryUrl() {
return ""
}
def getRepositoryUsername() {
return ""
}
def getRepositoryPassword() {
return ""
}
signing {
required { isReleaseBuild() && gradle.taskGraph.hasTask("uploadArchives") }
sign configurations.archives
}
uploadArchives {
configuration = configurations.archives
repositories.mavenDeployer {
beforeDeployment { MavenDeployment deployment -> signing.signPom(deployment) }
repository(url: getReleaseRepositoryUrl()) {
authentication(userName: getRepositoryUsername(), password: getRepositoryPassword())
}
pom.project {
name 'signal-service-android'
packaging 'aar'
description 'Signal service communication library for Android'
url 'https://github.com/loki-project/session-android-service'
scm {
url 'scm:git@github.com:loki-project/session-android-service.git'
connection 'scm:git@github.com:loki-project/session-android-service.git'
developerConnection 'scm:git@github.com:loki-project/session-android-service.git'
}
licenses {
license {
name 'GPLv3'
url 'https://www.gnu.org/licenses/gpl-3.0.txt'
distribution 'repo'
}
}
developers {
developer {
name 'Niels Andriesse'
}
}
}
}
}
task installArchives(type: Upload) {
description "Installs the artifacts to the local Maven repository."
configuration = configurations['archives']
repositories {
mavenDeployer {
repository url: "file://${System.properties['user.home']}/.m2/repository"
}
}
}

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="org.whispersystems.signalservice"
android:versionCode="1"
android:versionName="0.1">
<application />
</manifest>

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service/android/src/main/java/org/whispersystems/signalservice/api/util/RealtimeSleepTimer.java Normal file
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package org.whispersystems.signalservice.api.util;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Build;
import android.os.SystemClock;
import android.util.Log;
import org.whispersystems.signalservice.api.util.SleepTimer;
import java.util.concurrent.TimeUnit;
/**
* A sleep timer that is based on elapsed realtime, so
* that it works properly, even in low-power sleep modes.
*
*/
public class RealtimeSleepTimer implements SleepTimer {
private static final String TAG = RealtimeSleepTimer.class.getSimpleName();
private final AlarmReceiver alarmReceiver;
private final Context context;
public RealtimeSleepTimer(Context context) {
this.context = context;
alarmReceiver = new RealtimeSleepTimer.AlarmReceiver();
}
@Override
public void sleep(long millis) {
context.registerReceiver(alarmReceiver,
new IntentFilter(AlarmReceiver.WAKE_UP_THREAD_ACTION));
final long startTime = System.currentTimeMillis();
alarmReceiver.setAlarm(millis);
while (System.currentTimeMillis() - startTime < millis) {
try {
synchronized (this) {
wait(millis - System.currentTimeMillis() + startTime);
}
} catch (InterruptedException e) {
Log.w(TAG, e);
}
}
context.unregisterReceiver(alarmReceiver);
}
private class AlarmReceiver extends BroadcastReceiver {
private static final String WAKE_UP_THREAD_ACTION = "org.whispersystems.signalservice.api.util.RealtimeSleepTimer.AlarmReceiver.WAKE_UP_THREAD";
private void setAlarm(long millis) {
final Intent intent = new Intent(WAKE_UP_THREAD_ACTION);
final PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, 0);
final AlarmManager alarmManager = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
Log.w(TAG, "Setting alarm to wake up in " + millis + "ms.");
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
alarmManager.setExactAndAllowWhileIdle(AlarmManager.ELAPSED_REALTIME_WAKEUP,
SystemClock.elapsedRealtime() + millis,
pendingIntent);
} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
alarmManager.setExact(AlarmManager.ELAPSED_REALTIME_WAKEUP,
SystemClock.elapsedRealtime() + millis,
pendingIntent);
} else {
alarmManager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP,
SystemClock.elapsedRealtime() + millis,
pendingIntent);
}
}
@Override
public void onReceive(Context context, Intent intent) {
Log.w(TAG, "Waking up.");
synchronized (RealtimeSleepTimer.this) {
RealtimeSleepTimer.this.notifyAll();
}
}
}
}

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apply plugin: "maven"
subprojects {
ext.versionNumber = "2.13.2"
ext.groupName = "org.whispersystems"
if (JavaVersion.current().isJava8Compatible()) {
allprojects {
tasks.withType(Javadoc) {
options.addStringOption('Xdoclint:none', '-quiet')
}
}
}
}

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apply plugin: "java-library"
apply plugin: "kotlin"
apply plugin: "maven"
apply plugin: "signing"
sourceCompatibility = 8
targetCompatibility = 8
archivesBaseName = "signal-service-java"
version = versionNumber
group = groupName
repositories {
mavenLocal()
google()
jcenter()
mavenCentral()
}
configurations.all {
resolutionStrategy.cacheChangingModulesFor 0, 'seconds'
}
dependencies {
implementation "com.google.protobuf:protobuf-java:$protobufVersion"
implementation "com.googlecode.libphonenumber:libphonenumber:8.10.7"
implementation "com.fasterxml.jackson.core:jackson-databind:$jacksonDatabindVersion"
implementation "org.whispersystems:curve25519-java:$curve25519Version"
implementation "com.squareup.okhttp3:okhttp:$okhttpVersion"
implementation "org.threeten:threetenbp:1.3.6"
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlinVersion"
implementation "org.jetbrains.kotlin:kotlin-reflect:$kotlinVersion"
//FIXME AC: If we want to keep this library to target pure Java,
// we should remove Android related dependencies.
implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.9"
implementation "nl.komponents.kovenant:kovenant:$kovenantVersion"
testImplementation "junit:junit:3.8.2"
testImplementation "org.assertj:assertj-core:1.7.1"
testImplementation "org.conscrypt:conscrypt-openjdk-uber:2.0.0"
}
tasks.whenTaskAdded { task ->
if (task.name.equals("lint")) {
task.enabled = false
}
}
def isReleaseBuild() {
return version.contains("SNAPSHOT") == false
}
def getReleaseRepositoryUrl() {
return ""
}
def getRepositoryUsername() {
return ""
}
def getRepositoryPassword() {
return ""
}
signing {
required { isReleaseBuild() && gradle.taskGraph.hasTask("uploadArchives") }
sign configurations.archives
}
uploadArchives {
configuration = configurations.archives
repositories.mavenDeployer {
beforeDeployment { MavenDeployment deployment -> signing.signPom(deployment) }
repository(url: getReleaseRepositoryUrl()) {
authentication(userName: getRepositoryUsername(), password: getRepositoryPassword())
}
pom.project {
name "signal-service-java"
packaging "jar"
description "Signal Service communication library for Java"
url 'https://github.com/loki-project/loki-messenger-android-core'
scm {
url 'scm:git@github.com:loki-project/loki-messenger-android-core.git'
connection 'scm:git@github.com:loki-project/loki-messenger-android-core.git'
developerConnection 'scm:git@github.com:loki-project/loki-messenger-android-core.git'
}
licenses {
license {
name "GPLv3"
url "https://www.gnu.org/licenses/gpl-3.0.txt"
distribution "repo"
}
}
developers {
developer {
name "Niels Andriesse"
}
}
}
}
}
task installArchives(type: Upload) {
description "Installs the artifacts to the local Maven repository."
configuration = configurations["archives"]
repositories {
mavenDeployer {
repository url: "file://${System.properties["user.home"]}/.m2/repository"
}
}
}
task packageJavadoc(type: Jar, dependsOn: "javadoc") {
from javadoc.destinationDir
classifier = "javadoc"
}
task packageSources(type: Jar) {
from sourceSets.main.allSource
classifier = "sources"
}
artifacts {
archives packageJavadoc
archives packageSources
}

13
service/java/src/main/java/org/signal/libsignal/metadata/InvalidMetadataMessageException.java Normal file
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package org.signal.libsignal.metadata;
public class InvalidMetadataMessageException extends Exception {
public InvalidMetadataMessageException(String s) {
super(s);
}
public InvalidMetadataMessageException(Exception s) {
super(s);
}
}

8
service/java/src/main/java/org/signal/libsignal/metadata/InvalidMetadataVersionException.java Normal file
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package org.signal.libsignal.metadata;
public class InvalidMetadataVersionException extends Exception {
public InvalidMetadataVersionException(String s) {
super(s);
}
}

8
service/java/src/main/java/org/signal/libsignal/metadata/ProtocolDuplicateMessageException.java Normal file
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package org.signal.libsignal.metadata;
public class ProtocolDuplicateMessageException extends ProtocolException {
public ProtocolDuplicateMessageException(Exception e, String sender, int senderDevice) {
super(e, sender, senderDevice);
}
}

22
service/java/src/main/java/org/signal/libsignal/metadata/ProtocolException.java Normal file
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package org.signal.libsignal.metadata;
public abstract class ProtocolException extends Exception {
private final String sender;
private final int senderDevice;
public ProtocolException(Exception e, String sender, int senderDevice) {
super(e);
this.sender = sender;
this.senderDevice = senderDevice;
}
public String getSender() {
return sender;
}
public int getSenderDevice() {
return senderDevice;
}
}

10
service/java/src/main/java/org/signal/libsignal/metadata/ProtocolInvalidKeyException.java Normal file
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package org.signal.libsignal.metadata;
import org.whispersystems.libsignal.InvalidKeyException;
public class ProtocolInvalidKeyException extends ProtocolException {
public ProtocolInvalidKeyException(InvalidKeyException e, String sender, int senderDevice) {
super(e, sender, senderDevice);
}
}

8
service/java/src/main/java/org/signal/libsignal/metadata/ProtocolInvalidKeyIdException.java Normal file
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package org.signal.libsignal.metadata;
public class ProtocolInvalidKeyIdException extends ProtocolException {
public ProtocolInvalidKeyIdException(Exception e, String sender, int senderDevice) {
super(e, sender, senderDevice);
}
}

10
service/java/src/main/java/org/signal/libsignal/metadata/ProtocolInvalidMessageException.java Normal file
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package org.signal.libsignal.metadata;
import org.whispersystems.libsignal.InvalidMessageException;
public class ProtocolInvalidMessageException extends ProtocolException {
public ProtocolInvalidMessageException(InvalidMessageException e, String sender, int senderDevice) {
super(e, sender, senderDevice);
}
}

10
service/java/src/main/java/org/signal/libsignal/metadata/ProtocolInvalidVersionException.java Normal file
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@ -0,0 +1,10 @@
package org.signal.libsignal.metadata;
import org.whispersystems.libsignal.InvalidVersionException;
public class ProtocolInvalidVersionException extends ProtocolException {
public ProtocolInvalidVersionException(InvalidVersionException e, String sender, int senderDevice) {
super(e, sender, senderDevice);
}
}

10
service/java/src/main/java/org/signal/libsignal/metadata/ProtocolLegacyMessageException.java Normal file
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package org.signal.libsignal.metadata;
import org.whispersystems.libsignal.LegacyMessageException;
public class ProtocolLegacyMessageException extends ProtocolException {
public ProtocolLegacyMessageException(LegacyMessageException e, String sender, int senderDeviceId) {
super(e, sender, senderDeviceId);
}
}

10
service/java/src/main/java/org/signal/libsignal/metadata/ProtocolNoSessionException.java Normal file
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@ -0,0 +1,10 @@
package org.signal.libsignal.metadata;
import org.whispersystems.libsignal.NoSessionException;
public class ProtocolNoSessionException extends ProtocolException {
public ProtocolNoSessionException(NoSessionException e, String sender, int senderDevice) {
super(e, sender, senderDevice);
}
}

10
service/java/src/main/java/org/signal/libsignal/metadata/ProtocolUntrustedIdentityException.java Normal file
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package org.signal.libsignal.metadata;
import org.whispersystems.libsignal.UntrustedIdentityException;
public class ProtocolUntrustedIdentityException extends ProtocolException {
public ProtocolUntrustedIdentityException(UntrustedIdentityException e, String sender, int senderDevice) {
super(e, sender, senderDevice);
}
}

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service/java/src/main/java/org/signal/libsignal/metadata/SealedSessionCipher.java Normal file
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package org.signal.libsignal.metadata;
import org.signal.libsignal.metadata.certificate.CertificateValidator;
import org.signal.libsignal.metadata.certificate.InvalidCertificateException;
import org.signal.libsignal.metadata.certificate.SenderCertificate;
import org.signal.libsignal.metadata.protocol.UnidentifiedSenderMessage;
import org.signal.libsignal.metadata.protocol.UnidentifiedSenderMessageContent;
import org.whispersystems.libsignal.DuplicateMessageException;
import org.whispersystems.libsignal.IdentityKey;
import org.whispersystems.libsignal.IdentityKeyPair;
import org.whispersystems.libsignal.InvalidKeyException;
import org.whispersystems.libsignal.InvalidKeyIdException;
import org.whispersystems.libsignal.InvalidMacException;
import org.whispersystems.libsignal.InvalidMessageException;
import org.whispersystems.libsignal.InvalidVersionException;
import org.whispersystems.libsignal.LegacyMessageException;
import org.whispersystems.libsignal.NoSessionException;
import org.whispersystems.libsignal.SessionCipher;
import org.whispersystems.libsignal.SignalProtocolAddress;
import org.whispersystems.libsignal.UntrustedIdentityException;
import org.whispersystems.libsignal.ecc.Curve;
import org.whispersystems.libsignal.ecc.ECKeyPair;
import org.whispersystems.libsignal.ecc.ECPrivateKey;
import org.whispersystems.libsignal.ecc.ECPublicKey;
import org.whispersystems.libsignal.kdf.HKDFv3;
import org.whispersystems.libsignal.loki.FallbackSessionCipher;
import org.whispersystems.libsignal.loki.LokiSessionCipher;
import org.whispersystems.libsignal.loki.SessionResetProtocol;
import org.whispersystems.libsignal.protocol.CiphertextMessage;
import org.whispersystems.libsignal.protocol.PreKeySignalMessage;
import org.whispersystems.libsignal.protocol.SignalMessage;
import org.whispersystems.libsignal.state.SignalProtocolStore;
import org.whispersystems.libsignal.util.ByteUtil;
import org.whispersystems.libsignal.util.Hex;
import org.whispersystems.libsignal.util.Pair;
import java.io.IOException;
import java.security.InvalidAlgorithmParameterException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.text.ParseException;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.Mac;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public class SealedSessionCipher {
private final SignalProtocolStore signalProtocolStore;
private final SessionResetProtocol sessionResetProtocol;
private final SignalProtocolAddress localAddress;
public SealedSessionCipher(SignalProtocolStore signalProtocolStore,
SessionResetProtocol sessionResetProtocol,
SignalProtocolAddress localAddress)
{
this.signalProtocolStore = signalProtocolStore;
this.sessionResetProtocol = sessionResetProtocol;
this.localAddress = localAddress;
}
public byte[] encrypt(SignalProtocolAddress destinationAddress, SenderCertificate senderCertificate, byte[] paddedPlaintext)
throws InvalidKeyException, UntrustedIdentityException
{
CiphertextMessage message = new SessionCipher(signalProtocolStore, destinationAddress).encrypt(paddedPlaintext);
return encrypt(destinationAddress, senderCertificate, message);
}
public byte[] encrypt(SignalProtocolAddress destinationAddress, SenderCertificate senderCertificate, CiphertextMessage message)
throws InvalidKeyException
{
try {
IdentityKeyPair ourIdentity = signalProtocolStore.getIdentityKeyPair();
byte[] theirPublicKey = Hex.fromStringCondensed(destinationAddress.getName());
ECPublicKey theirIdentity = new IdentityKey(theirPublicKey, 0).getPublicKey();
ECKeyPair ephemeral = Curve.generateKeyPair();
byte[] ephemeralSalt = ByteUtil.combine("UnidentifiedDelivery".getBytes(), theirIdentity.serialize(), ephemeral.getPublicKey().serialize());
EphemeralKeys ephemeralKeys = calculateEphemeralKeys(theirIdentity, ephemeral.getPrivateKey(), ephemeralSalt);
byte[] staticKeyCiphertext = encrypt(ephemeralKeys.cipherKey, ephemeralKeys.macKey, ourIdentity.getPublicKey().serialize());
byte[] staticSalt = ByteUtil.combine(ephemeralKeys.chainKey, staticKeyCiphertext);
StaticKeys staticKeys = calculateStaticKeys(theirIdentity, ourIdentity.getPrivateKey(), staticSalt);
UnidentifiedSenderMessageContent content = new UnidentifiedSenderMessageContent(message.getType(), senderCertificate, message.serialize());
byte[] messageBytes = encrypt(staticKeys.cipherKey, staticKeys.macKey, content.getSerialized());
return new UnidentifiedSenderMessage(ephemeral.getPublicKey(), staticKeyCiphertext, messageBytes).getSerialized();
} catch (IOException e) {
throw new InvalidKeyException(e);
}
}
/**
* Decrypt a sealed session message.
* This will return a Pair<Integer, byte[]> which is the CipherTextMessage type and the decrypted message content
*/
public Pair<SignalProtocolAddress, Pair<Integer, byte[]>> decrypt(CertificateValidator validator, byte[] ciphertext, long timestamp, String prefixedPublicKey)
throws
InvalidMetadataMessageException, InvalidMetadataVersionException,
ProtocolInvalidMessageException, ProtocolInvalidKeyException,
ProtocolNoSessionException, ProtocolLegacyMessageException,
ProtocolInvalidVersionException, ProtocolDuplicateMessageException,
ProtocolInvalidKeyIdException, ProtocolUntrustedIdentityException,
SelfSendException, IOException
{
UnidentifiedSenderMessageContent content;
try {
IdentityKeyPair ourIdentity = signalProtocolStore.getIdentityKeyPair();
UnidentifiedSenderMessage wrapper = new UnidentifiedSenderMessage(ciphertext);
byte[] ephemeralSalt = ByteUtil.combine("UnidentifiedDelivery".getBytes(), ourIdentity.getPublicKey().serialize(), wrapper.getEphemeral().serialize());
EphemeralKeys ephemeralKeys = calculateEphemeralKeys(wrapper.getEphemeral(), ourIdentity.getPrivateKey(), ephemeralSalt);
byte[] staticKeyBytes = decrypt(ephemeralKeys.cipherKey, ephemeralKeys.macKey, wrapper.getEncryptedStatic());
ECPublicKey staticKey = Curve.decodePoint(staticKeyBytes, 0);
byte[] staticSalt = ByteUtil.combine(ephemeralKeys.chainKey, wrapper.getEncryptedStatic());
StaticKeys staticKeys = calculateStaticKeys(staticKey, ourIdentity.getPrivateKey(), staticSalt);
byte[] messageBytes = decrypt(staticKeys.cipherKey, staticKeys.macKey, wrapper.getEncryptedMessage());
content = new UnidentifiedSenderMessageContent(messageBytes);
validator.validate(content.getSenderCertificate(), timestamp);
if (content.getSenderCertificate().getSender().equals(localAddress.getName()) &&
content.getSenderCertificate().getSenderDeviceId() == localAddress.getDeviceId())
{
throw new SelfSendException();
}
} catch (InvalidKeyException e) {
throw new InvalidMetadataMessageException(e);
} catch (InvalidMacException e) {
throw new InvalidMetadataMessageException(e);
} catch (InvalidCertificateException e) {
throw new InvalidMetadataMessageException(e);
}
try {
Pair<Integer, byte[]> dataPair = new Pair<>(content.getType(), decrypt(content));
return new Pair<>(
new SignalProtocolAddress(content.getSenderCertificate().getSender(), content.getSenderCertificate().getSenderDeviceId()),
dataPair
);
} catch (InvalidMessageException e) {
throw new ProtocolInvalidMessageException(e, content.getSenderCertificate().getSender(), content.getSenderCertificate().getSenderDeviceId());
} catch (InvalidKeyException e) {
throw new ProtocolInvalidKeyException(e, content.getSenderCertificate().getSender(), content.getSenderCertificate().getSenderDeviceId());
} catch (NoSessionException e) {
throw new ProtocolNoSessionException(e, content.getSenderCertificate().getSender(), content.getSenderCertificate().getSenderDeviceId());
} catch (LegacyMessageException e) {
throw new ProtocolLegacyMessageException(e, content.getSenderCertificate().getSender(), content.getSenderCertificate().getSenderDeviceId());
} catch (InvalidVersionException e) {
throw new ProtocolInvalidVersionException(e, content.getSenderCertificate().getSender(), content.getSenderCertificate().getSenderDeviceId());
} catch (DuplicateMessageException e) {
throw new ProtocolDuplicateMessageException(e, content.getSenderCertificate().getSender(), content.getSenderCertificate().getSenderDeviceId());
} catch (InvalidKeyIdException e) {
throw new ProtocolInvalidKeyIdException(e, content.getSenderCertificate().getSender(), content.getSenderCertificate().getSenderDeviceId());
} catch (UntrustedIdentityException e) {
throw new ProtocolUntrustedIdentityException(e, content.getSenderCertificate().getSender(), content.getSenderCertificate().getSenderDeviceId());
}
}
public int getSessionVersion(SignalProtocolAddress remoteAddress) {
return new SessionCipher(signalProtocolStore, remoteAddress).getSessionVersion();
}
public int getRemoteRegistrationId(SignalProtocolAddress remoteAddress) {
return new SessionCipher(signalProtocolStore, remoteAddress).getRemoteRegistrationId();
}
private EphemeralKeys calculateEphemeralKeys(ECPublicKey ephemeralPublic, ECPrivateKey ephemeralPrivate, byte[] salt) throws InvalidKeyException {
try {
byte[] ephemeralSecret = Curve.calculateAgreement(ephemeralPublic, ephemeralPrivate);
byte[] ephemeralDerived = new HKDFv3().deriveSecrets(ephemeralSecret, salt, new byte[0], 96);
byte[][] ephemeralDerivedParts = ByteUtil.split(ephemeralDerived, 32, 32, 32);
return new EphemeralKeys(ephemeralDerivedParts[0], ephemeralDerivedParts[1], ephemeralDerivedParts[2]);
} catch (ParseException e) {
throw new AssertionError(e);
}
}
private StaticKeys calculateStaticKeys(ECPublicKey staticPublic, ECPrivateKey staticPrivate, byte[] salt) throws InvalidKeyException {
try {
byte[] staticSecret = Curve.calculateAgreement(staticPublic, staticPrivate);
byte[] staticDerived = new HKDFv3().deriveSecrets(staticSecret, salt, new byte[0], 96);
byte[][] staticDerivedParts = ByteUtil.split(staticDerived, 32, 32, 32);
return new StaticKeys(staticDerivedParts[1], staticDerivedParts[2]);
} catch (ParseException e) {
throw new AssertionError(e);
}
}
private byte[] decrypt(UnidentifiedSenderMessageContent message)
throws InvalidVersionException, InvalidMessageException, InvalidKeyException, DuplicateMessageException, InvalidKeyIdException, UntrustedIdentityException, LegacyMessageException, NoSessionException
{
SignalProtocolAddress sender = new SignalProtocolAddress(message.getSenderCertificate().getSender(), message.getSenderCertificate().getSenderDeviceId());
switch (message.getType()) {
case CiphertextMessage.WHISPER_TYPE: return new LokiSessionCipher(signalProtocolStore, sessionResetProtocol, sender).decrypt(new SignalMessage(message.getContent()));
case CiphertextMessage.PREKEY_TYPE: return new LokiSessionCipher(signalProtocolStore, sessionResetProtocol, sender).decrypt(new PreKeySignalMessage(message.getContent()));
case CiphertextMessage.FALLBACK_MESSAGE_TYPE: {
try {
byte[] privateKey = signalProtocolStore.getIdentityKeyPair().getPrivateKey().serialize();
return new FallbackSessionCipher(privateKey, sender.getName()).decrypt(message.getContent());
} catch (Exception e) {
throw new InvalidMessageException("Failed to decrypt fallback message.");
}
}
default: throw new InvalidMessageException("Unknown type: " + message.getType());
}
}
private byte[] encrypt(SecretKeySpec cipherKey, SecretKeySpec macKey, byte[] plaintext) {
try {
Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding");
cipher.init(Cipher.ENCRYPT_MODE, cipherKey, new IvParameterSpec(new byte[16]));
Mac mac = Mac.getInstance("HmacSHA256");
mac.init(macKey);
byte[] ciphertext = cipher.doFinal(plaintext);
byte[] ourFullMac = mac.doFinal(ciphertext);
byte[] ourMac = ByteUtil.trim(ourFullMac, 10);
return ByteUtil.combine(ciphertext, ourMac);
} catch (NoSuchAlgorithmException e) {
throw new AssertionError(e);
} catch (NoSuchPaddingException e) {
throw new AssertionError(e);
} catch (java.security.InvalidKeyException e) {
throw new AssertionError(e);
} catch (BadPaddingException e) {
throw new AssertionError(e);
} catch (IllegalBlockSizeException e) {
throw new AssertionError(e);
} catch (InvalidAlgorithmParameterException e) {
throw new AssertionError(e);
}
}
private byte[] decrypt(SecretKeySpec cipherKey, SecretKeySpec macKey, byte[] ciphertext) throws InvalidMacException {
try {
if (ciphertext.length < 10) {
throw new InvalidMacException("Ciphertext not long enough for MAC!");
}
byte[][] ciphertextParts = ByteUtil.split(ciphertext, ciphertext.length - 10, 10);
Mac mac = Mac.getInstance("HmacSHA256");
mac.init(macKey);
byte[] digest = mac.doFinal(ciphertextParts[0]);
byte[] ourMac = ByteUtil.trim(digest, 10);
byte[] theirMac = ciphertextParts[1];
if (!MessageDigest.isEqual(ourMac, theirMac)) {
throw new InvalidMacException("Bad mac!");
}
Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding");
cipher.init(Cipher.DECRYPT_MODE, cipherKey, new IvParameterSpec(new byte[16]));
return cipher.doFinal(ciphertextParts[0]);
} catch (NoSuchAlgorithmException e) {
throw new AssertionError(e);
} catch (java.security.InvalidKeyException e) {
throw new AssertionError(e);
} catch (NoSuchPaddingException e) {
throw new AssertionError(e);
} catch (InvalidAlgorithmParameterException e) {
throw new AssertionError(e);
} catch (IllegalBlockSizeException e) {
throw new AssertionError(e);
} catch (BadPaddingException e) {
throw new AssertionError(e);
}
}
private static class EphemeralKeys {
private final byte[] chainKey;
private final SecretKeySpec cipherKey;
private final SecretKeySpec macKey;
private EphemeralKeys(byte[] chainKey, byte[] cipherKey, byte[] macKey) {
this.chainKey = chainKey;
this.cipherKey = new SecretKeySpec(cipherKey, "AES");
this.macKey = new SecretKeySpec(macKey, "HmacSHA256");
}
}
private static class StaticKeys {
private final SecretKeySpec cipherKey;
private final SecretKeySpec macKey;
private StaticKeys(byte[] cipherKey, byte[] macKey) {
this.cipherKey = new SecretKeySpec(cipherKey, "AES");
this.macKey = new SecretKeySpec(macKey, "HmacSHA256");
}
}
}

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service/java/src/main/java/org/signal/libsignal/metadata/SelfSendException.java Normal file
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package org.signal.libsignal.metadata;
public class SelfSendException extends Exception { }

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service/java/src/main/java/org/signal/libsignal/metadata/SignalProtos.java Normal file
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24
service/java/src/main/java/org/signal/libsignal/metadata/certificate/CertificateValidator.java Normal file
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package org.signal.libsignal.metadata.certificate;
import java.util.HashSet;
import java.util.Set;
public class CertificateValidator {
@SuppressWarnings("MismatchedQueryAndUpdateOfCollection")
private static final Set<Integer> REVOKED = new HashSet<Integer>() {{
}};
public void validate(SenderCertificate certificate, long validationTime) throws InvalidCertificateException {
if (certificate.getSender() == null || certificate.getSenderDeviceId() <= 0) {
throw new InvalidCertificateException("Sender or sender device id is invalid");
}
}
// VisibleForTesting
void validate(ServerCertificate certificate) throws InvalidCertificateException {
}
}

12
service/java/src/main/java/org/signal/libsignal/metadata/certificate/InvalidCertificateException.java Normal file
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package org.signal.libsignal.metadata.certificate;
public class InvalidCertificateException extends Exception {
public InvalidCertificateException(String s) {
super(s);
}
public InvalidCertificateException(Exception e) {
super(e);
}
}

51
service/java/src/main/java/org/signal/libsignal/metadata/certificate/SenderCertificate.java Normal file
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package org.signal.libsignal.metadata.certificate;
import com.google.protobuf.InvalidProtocolBufferException;
import org.signal.libsignal.metadata.SignalProtos;
public class SenderCertificate {
private final int senderDeviceId;
private final String sender;
private final byte[] serialized;
private final byte[] certificate;
public SenderCertificate(byte[] serialized) throws InvalidCertificateException {
try {
SignalProtos.SenderCertificate certificate = SignalProtos.SenderCertificate.parseFrom(serialized);
if (!certificate.hasSenderDevice() || !certificate.hasSender()) {
throw new InvalidCertificateException("Missing fields");
}
this.sender = certificate.getSender();
this.senderDeviceId = certificate.getSenderDevice();
this.serialized = serialized;
this.certificate = certificate.toByteArray();
} catch (InvalidProtocolBufferException e) {
throw new InvalidCertificateException(e);
}
}
public int getSenderDeviceId() {
return senderDeviceId;
}
public String getSender() {
return sender;
}
public byte[] getSerialized() {
return serialized;
}
public byte[] getCertificate() {
return certificate;
}
}

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service/java/src/main/java/org/signal/libsignal/metadata/certificate/ServerCertificate.java Normal file
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package org.signal.libsignal.metadata.certificate;
import com.google.protobuf.InvalidProtocolBufferException;
import org.signal.libsignal.metadata.SignalProtos;
import org.whispersystems.libsignal.InvalidKeyException;
import org.whispersystems.libsignal.ecc.Curve;
import org.whispersystems.libsignal.ecc.ECPublicKey;
public class ServerCertificate {
private final int keyId;
private final ECPublicKey key;
private final byte[] serialized;
private final byte[] certificate;
private final byte[] signature;
public ServerCertificate(byte[] serialized) throws InvalidCertificateException {
try {
SignalProtos.ServerCertificate wrapper = SignalProtos.ServerCertificate.parseFrom(serialized);
if (!wrapper.hasCertificate() || !wrapper.hasSignature()) {
throw new InvalidCertificateException("Missing fields");
}
SignalProtos.ServerCertificate.Certificate certificate = SignalProtos.ServerCertificate.Certificate.parseFrom(wrapper.getCertificate());
if (!certificate.hasId() || !certificate.hasKey()) {
throw new InvalidCertificateException("Missing fields");
}
this.keyId = certificate.getId();
this.key = Curve.decodePoint(certificate.getKey().toByteArray(), 0);
this.serialized = serialized;
this.certificate = wrapper.getCertificate().toByteArray();
this.signature = wrapper.getSignature().toByteArray();
} catch (InvalidProtocolBufferException e) {
throw new InvalidCertificateException(e);
} catch (InvalidKeyException e) {
throw new InvalidCertificateException(e);
}
}
public int getKeyId() {
return keyId;
}
public ECPublicKey getKey() {
return key;
}
public byte[] getSerialized() {
return serialized;
}
public byte[] getCertificate() {
return certificate;
}
public byte[] getSignature() {
return signature;
}
}

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service/java/src/main/java/org/signal/libsignal/metadata/protocol/UnidentifiedSenderMessage.java Normal file
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package org.signal.libsignal.metadata.protocol;
import com.google.protobuf.ByteString;
import com.google.protobuf.InvalidProtocolBufferException;
import org.signal.libsignal.metadata.InvalidMetadataMessageException;
import org.signal.libsignal.metadata.InvalidMetadataVersionException;
import org.signal.libsignal.metadata.SignalProtos;
import org.whispersystems.libsignal.InvalidKeyException;
import org.whispersystems.libsignal.InvalidMessageException;
import org.whispersystems.libsignal.InvalidVersionException;
import org.whispersystems.libsignal.ecc.Curve;
import org.whispersystems.libsignal.ecc.ECPublicKey;
import org.whispersystems.libsignal.util.ByteUtil;
public class UnidentifiedSenderMessage {
private static final int CIPHERTEXT_VERSION = 1;
private final int version;
private final ECPublicKey ephemeral;
private final byte[] encryptedStatic;
private final byte[] encryptedMessage;
private final byte[] serialized;
public UnidentifiedSenderMessage(byte[] serialized)
throws InvalidMetadataMessageException, InvalidMetadataVersionException
{
try {
this.version = ByteUtil.highBitsToInt(serialized[0]);
if (version > CIPHERTEXT_VERSION) {
throw new InvalidMetadataVersionException("Unknown version: " + this.version);
}
SignalProtos.UnidentifiedSenderMessage unidentifiedSenderMessage = SignalProtos.UnidentifiedSenderMessage.parseFrom(ByteString.copyFrom(serialized, 1, serialized.length - 1));
if (!unidentifiedSenderMessage.hasEphemeralPublic() ||
!unidentifiedSenderMessage.hasEncryptedStatic() ||
!unidentifiedSenderMessage.hasEncryptedMessage())
{
throw new InvalidMetadataMessageException("Missing fields");
}
this.ephemeral = Curve.decodePoint(unidentifiedSenderMessage.getEphemeralPublic().toByteArray(), 0);
this.encryptedStatic = unidentifiedSenderMessage.getEncryptedStatic().toByteArray();
this.encryptedMessage = unidentifiedSenderMessage.getEncryptedMessage().toByteArray();
this.serialized = serialized;
} catch (InvalidProtocolBufferException e) {
throw new InvalidMetadataMessageException(e);
} catch (InvalidKeyException e) {
throw new InvalidMetadataMessageException(e);
}
}
public UnidentifiedSenderMessage(ECPublicKey ephemeral, byte[] encryptedStatic, byte[] encryptedMessage) {
this.version = CIPHERTEXT_VERSION;
this.ephemeral = ephemeral;
this.encryptedStatic = encryptedStatic;
this.encryptedMessage = encryptedMessage;
byte[] versionBytes = {ByteUtil.intsToByteHighAndLow(CIPHERTEXT_VERSION, CIPHERTEXT_VERSION)};
byte[] messageBytes = SignalProtos.UnidentifiedSenderMessage.newBuilder()
.setEncryptedMessage(ByteString.copyFrom(encryptedMessage))
.setEncryptedStatic(ByteString.copyFrom(encryptedStatic))
.setEphemeralPublic(ByteString.copyFrom(ephemeral.serialize()))
.build()
.toByteArray();
this.serialized = ByteUtil.combine(versionBytes, messageBytes);
}
public ECPublicKey getEphemeral() {
return ephemeral;
}
public byte[] getEncryptedStatic() {
return encryptedStatic;
}
public byte[] getEncryptedMessage() {
return encryptedMessage;
}
public byte[] getSerialized() {
return serialized;
}
}

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service/java/src/main/java/org/signal/libsignal/metadata/protocol/UnidentifiedSenderMessageContent.java Normal file
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package org.signal.libsignal.metadata.protocol;
import com.google.protobuf.ByteString;
import com.google.protobuf.InvalidProtocolBufferException;
import org.signal.libsignal.metadata.InvalidMetadataMessageException;
import org.signal.libsignal.metadata.SignalProtos;
import org.signal.libsignal.metadata.certificate.InvalidCertificateException;
import org.signal.libsignal.metadata.certificate.SenderCertificate;
import org.whispersystems.libsignal.protocol.CiphertextMessage;
public class UnidentifiedSenderMessageContent {
private final int type;
private final SenderCertificate senderCertificate;
private final byte[] content;
private final byte[] serialized;
public UnidentifiedSenderMessageContent(byte[] serialized) throws InvalidMetadataMessageException, InvalidCertificateException {
try {
SignalProtos.UnidentifiedSenderMessage.Message message = SignalProtos.UnidentifiedSenderMessage.Message.parseFrom(serialized);
if (!message.hasType() || !message.hasSenderCertificate() || !message.hasContent()) {
throw new InvalidMetadataMessageException("Missing fields");
}
switch (message.getType()) {
case MESSAGE: this.type = CiphertextMessage.WHISPER_TYPE; break;
case PREKEY_MESSAGE: this.type = CiphertextMessage.PREKEY_TYPE; break;
case FALLBACK_MESSAGE: this.type = CiphertextMessage.FALLBACK_MESSAGE_TYPE; break;
default: throw new InvalidMetadataMessageException("Unknown type: " + message.getType().getNumber());
}
this.senderCertificate = new SenderCertificate(message.getSenderCertificate().toByteArray());
this.content = message.getContent().toByteArray();
this.serialized = serialized;
} catch (InvalidProtocolBufferException e) {
throw new InvalidMetadataMessageException(e);
}
}
public UnidentifiedSenderMessageContent(int type, SenderCertificate senderCertificate, byte[] content) {
try {
this.serialized = SignalProtos.UnidentifiedSenderMessage.Message.newBuilder()
.setType(SignalProtos.UnidentifiedSenderMessage.Message.Type.valueOf(getProtoType(type)))
.setSenderCertificate(SignalProtos.SenderCertificate.parseFrom(senderCertificate.getSerialized()))
.setContent(ByteString.copyFrom(content))
.build()
.toByteArray();
this.type = type;
this.senderCertificate = senderCertificate;
this.content = content;
} catch (InvalidProtocolBufferException e) {
throw new AssertionError(e);
}
}
public int getType() {
return type;
}
public SenderCertificate getSenderCertificate() {
return senderCertificate;
}
public byte[] getContent() {
return content;
}
public byte[] getSerialized() {
return serialized;
}
private int getProtoType(int type) {
switch (type) {
case CiphertextMessage.WHISPER_TYPE: return SignalProtos.UnidentifiedSenderMessage.Message.Type.MESSAGE_VALUE;
case CiphertextMessage.PREKEY_TYPE: return SignalProtos.UnidentifiedSenderMessage.Message.Type.PREKEY_MESSAGE_VALUE;
case CiphertextMessage.FALLBACK_MESSAGE_TYPE: return SignalProtos.UnidentifiedSenderMessage.Message.Type.FALLBACK_MESSAGE_VALUE;
default: throw new AssertionError(type);
}
}
}

10
service/java/src/main/java/org/whispersystems/libsignal/DecryptionCallback.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal;
public interface DecryptionCallback {
public void handlePlaintext(byte[] plaintext);
}

12
service/java/src/main/java/org/whispersystems/libsignal/DuplicateMessageException.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal;
public class DuplicateMessageException extends Exception {
public DuplicateMessageException(String s) {
super(s);
}
}

55
service/java/src/main/java/org/whispersystems/libsignal/IdentityKey.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal;
import org.whispersystems.libsignal.ecc.Curve;
import org.whispersystems.libsignal.ecc.ECPublicKey;
import org.whispersystems.libsignal.util.Hex;
/**
* A class for representing an identity key.
*
* @author Moxie Marlinspike
*/
public class IdentityKey {
private final ECPublicKey publicKey;
public IdentityKey(ECPublicKey publicKey) {
this.publicKey = publicKey;
}
public IdentityKey(byte[] bytes, int offset) throws InvalidKeyException {
this.publicKey = Curve.decodePoint(bytes, offset);
}
public ECPublicKey getPublicKey() {
return publicKey;
}
public byte[] serialize() {
return publicKey.serialize();
}
public String getFingerprint() {
return Hex.toString(publicKey.serialize());
}
@Override
public boolean equals(Object other) {
if (other == null) return false;
if (!(other instanceof IdentityKey)) return false;
return publicKey.equals(((IdentityKey) other).getPublicKey());
}
@Override
public int hashCode() {
return publicKey.hashCode();
}
}

55
service/java/src/main/java/org/whispersystems/libsignal/IdentityKeyPair.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal;
import com.google.protobuf.ByteString;
import com.google.protobuf.InvalidProtocolBufferException;
import org.whispersystems.libsignal.ecc.Curve;
import org.whispersystems.libsignal.ecc.ECPrivateKey;
import static org.whispersystems.libsignal.state.StorageProtos.IdentityKeyPairStructure;
/**
* Holder for public and private identity key pair.
*
* @author Moxie Marlinspike
*/
public class IdentityKeyPair {
private final IdentityKey publicKey;
private final ECPrivateKey privateKey;
public IdentityKeyPair(IdentityKey publicKey, ECPrivateKey privateKey) {
this.publicKey = publicKey;
this.privateKey = privateKey;
}
public IdentityKeyPair(byte[] serialized) throws InvalidKeyException {
try {
IdentityKeyPairStructure structure = IdentityKeyPairStructure.parseFrom(serialized);
this.publicKey = new IdentityKey(structure.getPublicKey().toByteArray(), 0);
this.privateKey = Curve.decodePrivatePoint(structure.getPrivateKey().toByteArray());
} catch (InvalidProtocolBufferException e) {
throw new InvalidKeyException(e);
}
}
public IdentityKey getPublicKey() {
return publicKey;
}
public ECPrivateKey getPrivateKey() {
return privateKey;
}
public byte[] serialize() {
return IdentityKeyPairStructure.newBuilder()
.setPublicKey(ByteString.copyFrom(publicKey.serialize()))
.setPrivateKey(ByteString.copyFrom(privateKey.serialize()))
.build().toByteArray();
}
}

23
service/java/src/main/java/org/whispersystems/libsignal/InvalidKeyException.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal;
public class InvalidKeyException extends Exception {
public InvalidKeyException() {}
public InvalidKeyException(String detailMessage) {
super(detailMessage);
}
public InvalidKeyException(Throwable throwable) {
super(throwable);
}
public InvalidKeyException(String detailMessage, Throwable throwable) {
super(detailMessage, throwable);
}
}

16
service/java/src/main/java/org/whispersystems/libsignal/InvalidKeyIdException.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal;
public class InvalidKeyIdException extends Exception {
public InvalidKeyIdException(String detailMessage) {
super(detailMessage);
}
public InvalidKeyIdException(Throwable throwable) {
super(throwable);
}
}

17
service/java/src/main/java/org/whispersystems/libsignal/InvalidMacException.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal;
public class InvalidMacException extends Exception {
public InvalidMacException(String detailMessage) {
super(detailMessage);
}
public InvalidMacException(Throwable throwable) {
super(throwable);
}
}

29
service/java/src/main/java/org/whispersystems/libsignal/InvalidMessageException.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal;
import java.util.List;
public class InvalidMessageException extends Exception {
public InvalidMessageException() {}
public InvalidMessageException(String detailMessage) {
super(detailMessage);
}
public InvalidMessageException(Throwable throwable) {
super(throwable);
}
public InvalidMessageException(String detailMessage, Throwable throwable) {
super(detailMessage, throwable);
}
public InvalidMessageException(String detailMessage, List<Exception> exceptions) {
super(detailMessage, exceptions.get(0));
}
}

12
service/java/src/main/java/org/whispersystems/libsignal/InvalidVersionException.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal;
public class InvalidVersionException extends Exception {
public InvalidVersionException(String detailMessage) {
super(detailMessage);
}
}

12
service/java/src/main/java/org/whispersystems/libsignal/LegacyMessageException.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal;
public class LegacyMessageException extends Exception {
public LegacyMessageException(String s) {
super(s);
}
}

16
service/java/src/main/java/org/whispersystems/libsignal/NoSessionException.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal;
public class NoSessionException extends Exception {
public NoSessionException(String s) {
super(s);
}
public NoSessionException(Exception nested) {
super(nested);
}
}

212
service/java/src/main/java/org/whispersystems/libsignal/SessionBuilder.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal;
import org.whispersystems.libsignal.ecc.Curve;
import org.whispersystems.libsignal.ecc.ECKeyPair;
import org.whispersystems.libsignal.ecc.ECPublicKey;
import org.whispersystems.libsignal.logging.Log;
import org.whispersystems.libsignal.protocol.PreKeySignalMessage;
import org.whispersystems.libsignal.protocol.SignalMessage;
import org.whispersystems.libsignal.ratchet.AliceSignalProtocolParameters;
import org.whispersystems.libsignal.ratchet.BobSignalProtocolParameters;
import org.whispersystems.libsignal.ratchet.RatchetingSession;
import org.whispersystems.libsignal.state.IdentityKeyStore;
import org.whispersystems.libsignal.state.PreKeyBundle;
import org.whispersystems.libsignal.state.PreKeyStore;
import org.whispersystems.libsignal.state.SessionRecord;
import org.whispersystems.libsignal.state.SessionStore;
import org.whispersystems.libsignal.state.SignalProtocolStore;
import org.whispersystems.libsignal.state.SignedPreKeyStore;
import org.whispersystems.libsignal.util.guava.Optional;
/**
* SessionBuilder is responsible for setting up encrypted sessions.
* Once a session has been established, {@link org.whispersystems.libsignal.SessionCipher}
* can be used to encrypt/decrypt messages in that session.
* <p>
* Sessions are built from one of three different possible vectors:
* <ol>
* <li>A {@link org.whispersystems.libsignal.state.PreKeyBundle} retrieved from a server.</li>
* <li>A {@link PreKeySignalMessage} received from a client.</li>
* </ol>
*
* Sessions are constructed per recipientId + deviceId tuple. Remote logical users are identified
* by their recipientId, and each logical recipientId can have multiple physical devices.
*
* @author Moxie Marlinspike
*/
public class SessionBuilder {
private static final String TAG = SessionBuilder.class.getSimpleName();
private final SessionStore sessionStore;
private final PreKeyStore preKeyStore;
private final SignedPreKeyStore signedPreKeyStore;
private final IdentityKeyStore identityKeyStore;
private final SignalProtocolAddress remoteAddress;
/**
* Constructs a SessionBuilder.
*
* @param sessionStore The {@link org.whispersystems.libsignal.state.SessionStore} to store the constructed session in.
* @param preKeyStore The {@link org.whispersystems.libsignal.state.PreKeyStore} where the client's local {@link org.whispersystems.libsignal.state.PreKeyRecord}s are stored.
* @param identityKeyStore The {@link org.whispersystems.libsignal.state.IdentityKeyStore} containing the client's identity key information.
* @param remoteAddress The address of the remote user to build a session with.
*/
public SessionBuilder(SessionStore sessionStore,
PreKeyStore preKeyStore,
SignedPreKeyStore signedPreKeyStore,
IdentityKeyStore identityKeyStore,
SignalProtocolAddress remoteAddress)
{
this.sessionStore = sessionStore;
this.preKeyStore = preKeyStore;
this.signedPreKeyStore = signedPreKeyStore;
this.identityKeyStore = identityKeyStore;
this.remoteAddress = remoteAddress;
}
/**
* Constructs a SessionBuilder
* @param store The {@link SignalProtocolStore} to store all state information in.
* @param remoteAddress The address of the remote user to build a session with.
*/
public SessionBuilder(SignalProtocolStore store, SignalProtocolAddress remoteAddress) {
this(store, store, store, store, remoteAddress);
}
/**
* Build a new session from a received {@link PreKeySignalMessage}.
*
* After a session is constructed in this way, the embedded {@link SignalMessage}
* can be decrypted.
*
* @param message The received {@link PreKeySignalMessage}.
* @throws org.whispersystems.libsignal.InvalidKeyIdException when there is no local
* {@link org.whispersystems.libsignal.state.PreKeyRecord}
* that corresponds to the PreKey ID in
* the message.
* @throws org.whispersystems.libsignal.InvalidKeyException when the message is formatted incorrectly.
* @throws org.whispersystems.libsignal.UntrustedIdentityException when the {@link IdentityKey} of the sender is untrusted.
*/
/*package*/ Optional<Integer> process(SessionRecord sessionRecord, PreKeySignalMessage message)
throws InvalidKeyIdException, InvalidKeyException, UntrustedIdentityException
{
IdentityKey theirIdentityKey = message.getIdentityKey();
if (!identityKeyStore.isTrustedIdentity(remoteAddress, theirIdentityKey, IdentityKeyStore.Direction.RECEIVING)) {
throw new UntrustedIdentityException(remoteAddress.getName(), theirIdentityKey);
}
Optional<Integer> unsignedPreKeyId = processV3(sessionRecord, message);
identityKeyStore.saveIdentity(remoteAddress, theirIdentityKey);
return unsignedPreKeyId;
}
private Optional<Integer> processV3(SessionRecord sessionRecord, PreKeySignalMessage message)
throws UntrustedIdentityException, InvalidKeyIdException, InvalidKeyException
{
if (sessionRecord.hasSessionState(message.getMessageVersion(), message.getBaseKey().serialize())) {
Log.w(TAG, "We've already setup a session for this V3 message, letting bundled message fall through...");
return Optional.absent();
}
ECKeyPair ourSignedPreKey = signedPreKeyStore.loadSignedPreKey(message.getSignedPreKeyId()).getKeyPair();
BobSignalProtocolParameters.Builder parameters = BobSignalProtocolParameters.newBuilder();
parameters.setTheirBaseKey(message.getBaseKey())
.setTheirIdentityKey(message.getIdentityKey())
.setOurIdentityKey(identityKeyStore.getIdentityKeyPair())
.setOurSignedPreKey(ourSignedPreKey)
.setOurRatchetKey(ourSignedPreKey);
if (message.getPreKeyId().isPresent()) {
parameters.setOurOneTimePreKey(Optional.of(preKeyStore.loadPreKey(message.getPreKeyId().get()).getKeyPair()));
} else {
parameters.setOurOneTimePreKey(Optional.<ECKeyPair>absent());
}
if (!sessionRecord.isFresh()) sessionRecord.archiveCurrentState();
RatchetingSession.initializeSession(sessionRecord.getSessionState(), parameters.create());
sessionRecord.getSessionState().setLocalRegistrationId(identityKeyStore.getLocalRegistrationId());
sessionRecord.getSessionState().setRemoteRegistrationId(message.getRegistrationId());
sessionRecord.getSessionState().setAliceBaseKey(message.getBaseKey().serialize());
if (message.getPreKeyId().isPresent()) {
return message.getPreKeyId();
} else {
return Optional.absent();
}
}
/**
* Build a new session from a {@link org.whispersystems.libsignal.state.PreKeyBundle} retrieved from
* a server.
*
* @param preKey A PreKey for the destination recipient, retrieved from a server.
* @throws InvalidKeyException when the {@link org.whispersystems.libsignal.state.PreKeyBundle} is
* badly formatted.
* @throws org.whispersystems.libsignal.UntrustedIdentityException when the sender's
* {@link IdentityKey} is not
* trusted.
*/
public void process(PreKeyBundle preKey) throws InvalidKeyException, UntrustedIdentityException {
synchronized (SessionCipher.SESSION_LOCK) {
if (!identityKeyStore.isTrustedIdentity(remoteAddress, preKey.getIdentityKey(), IdentityKeyStore.Direction.SENDING)) {
throw new UntrustedIdentityException(remoteAddress.getName(), preKey.getIdentityKey());
}
if (preKey.getSignedPreKey() != null &&
!Curve.verifySignature(preKey.getIdentityKey().getPublicKey(),
preKey.getSignedPreKey().serialize(),
preKey.getSignedPreKeySignature()))
{
throw new InvalidKeyException("Invalid signature on device key!");
}
if (preKey.getSignedPreKey() == null) {
throw new InvalidKeyException("No signed prekey!");
}
SessionRecord sessionRecord = sessionStore.loadSession(remoteAddress);
ECKeyPair ourBaseKey = Curve.generateKeyPair();
ECPublicKey theirSignedPreKey = preKey.getSignedPreKey();
Optional<ECPublicKey> theirOneTimePreKey = Optional.fromNullable(preKey.getPreKey());
Optional<Integer> theirOneTimePreKeyId = theirOneTimePreKey.isPresent() ? Optional.of(preKey.getPreKeyId()) :
Optional.<Integer>absent();
AliceSignalProtocolParameters.Builder parameters = AliceSignalProtocolParameters.newBuilder();
parameters.setOurBaseKey(ourBaseKey)
.setOurIdentityKey(identityKeyStore.getIdentityKeyPair())
.setTheirIdentityKey(preKey.getIdentityKey())
.setTheirSignedPreKey(theirSignedPreKey)
.setTheirRatchetKey(theirSignedPreKey)
.setTheirOneTimePreKey(theirOneTimePreKey);
if (!sessionRecord.isFresh()) sessionRecord.archiveCurrentState();
RatchetingSession.initializeSession(sessionRecord.getSessionState(), parameters.create());
sessionRecord.getSessionState().setUnacknowledgedPreKeyMessage(theirOneTimePreKeyId, preKey.getSignedPreKeyId(), ourBaseKey.getPublicKey());
sessionRecord.getSessionState().setLocalRegistrationId(identityKeyStore.getLocalRegistrationId());
sessionRecord.getSessionState().setRemoteRegistrationId(preKey.getRegistrationId());
sessionRecord.getSessionState().setAliceBaseKey(ourBaseKey.getPublicKey().serialize());
identityKeyStore.saveIdentity(remoteAddress, preKey.getIdentityKey());
sessionStore.storeSession(remoteAddress, sessionRecord);
}
}
}

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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal;
import org.whispersystems.libsignal.ecc.Curve;
import org.whispersystems.libsignal.ecc.ECKeyPair;
import org.whispersystems.libsignal.ecc.ECPublicKey;
import org.whispersystems.libsignal.loki.FallbackSessionCipher;
import org.whispersystems.libsignal.protocol.CiphertextMessage;
import org.whispersystems.libsignal.protocol.PreKeySignalMessage;
import org.whispersystems.libsignal.protocol.SignalMessage;
import org.whispersystems.libsignal.ratchet.ChainKey;
import org.whispersystems.libsignal.ratchet.MessageKeys;
import org.whispersystems.libsignal.ratchet.RootKey;
import org.whispersystems.libsignal.state.IdentityKeyStore;
import org.whispersystems.libsignal.state.PreKeyStore;
import org.whispersystems.libsignal.state.SessionRecord;
import org.whispersystems.libsignal.state.SessionState;
import org.whispersystems.libsignal.state.SessionStore;
import org.whispersystems.libsignal.state.SignalProtocolStore;
import org.whispersystems.libsignal.state.SignedPreKeyStore;
import org.whispersystems.libsignal.util.Pair;
import org.whispersystems.libsignal.util.guava.Optional;
import java.security.InvalidAlgorithmParameterException;
import java.security.NoSuchAlgorithmException;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import static org.whispersystems.libsignal.state.SessionState.UnacknowledgedPreKeyMessageItems;
/**
* The main entry point for Signal Protocol encrypt/decrypt operations.
*
* Once a session has been established with {@link SessionBuilder},
* this class can be used for all encrypt/decrypt operations within
* that session.
*
* @author Moxie Marlinspike
*/
public class SessionCipher {
public static final Object SESSION_LOCK = new Object();
private final SessionStore sessionStore;
private final IdentityKeyStore identityKeyStore;
private final SessionBuilder sessionBuilder;
private final PreKeyStore preKeyStore;
private final SignalProtocolAddress remoteAddress;
/**
* Construct a SessionCipher for encrypt/decrypt operations on a session.
* In order to use SessionCipher, a session must have already been created
* and stored using {@link SessionBuilder}.
*
* @param sessionStore The {@link SessionStore} that contains a session for this recipient.
* @param remoteAddress The remote address that messages will be encrypted to or decrypted from.
*/
public SessionCipher(SessionStore sessionStore, PreKeyStore preKeyStore,
SignedPreKeyStore signedPreKeyStore, IdentityKeyStore identityKeyStore,
SignalProtocolAddress remoteAddress)
{
this.sessionStore = sessionStore;
this.preKeyStore = preKeyStore;
this.identityKeyStore = identityKeyStore;
this.remoteAddress = remoteAddress;
this.sessionBuilder = new SessionBuilder(sessionStore, preKeyStore, signedPreKeyStore,
identityKeyStore, remoteAddress);
}
public SessionCipher(SignalProtocolStore store, SignalProtocolAddress remoteAddress) {
this(store, store, store, store, remoteAddress);
}
/**
* Encrypt a message.
*
* @param paddedMessage The plaintext message bytes, optionally padded to a constant multiple.
* @return A ciphertext message encrypted to the recipient+device tuple.
*/
public CiphertextMessage encrypt(byte[] paddedMessage) throws UntrustedIdentityException {
synchronized (SESSION_LOCK) {
SessionRecord sessionRecord = sessionStore.loadSession(remoteAddress);
SessionState sessionState = sessionRecord.getSessionState();
ChainKey chainKey = sessionState.getSenderChainKey();
MessageKeys messageKeys = chainKey.getMessageKeys();
ECPublicKey senderEphemeral = sessionState.getSenderRatchetKey();
int previousCounter = sessionState.getPreviousCounter();
int sessionVersion = sessionState.getSessionVersion();
byte[] ciphertextBody = getCiphertext(messageKeys, paddedMessage);
CiphertextMessage ciphertextMessage = new SignalMessage(sessionVersion, messageKeys.getMacKey(),
senderEphemeral, chainKey.getIndex(),
previousCounter, ciphertextBody,
sessionState.getLocalIdentityKey(),
sessionState.getRemoteIdentityKey());
if (sessionState.hasUnacknowledgedPreKeyMessage()) {
UnacknowledgedPreKeyMessageItems items = sessionState.getUnacknowledgedPreKeyMessageItems();
int localRegistrationId = sessionState.getLocalRegistrationId();
ciphertextMessage = new PreKeySignalMessage(sessionVersion, localRegistrationId, items.getPreKeyId(),
items.getSignedPreKeyId(), items.getBaseKey(),
sessionState.getLocalIdentityKey(),
(SignalMessage) ciphertextMessage);
}
sessionState.setSenderChainKey(chainKey.getNextChainKey());
if (!identityKeyStore.isTrustedIdentity(remoteAddress, sessionState.getRemoteIdentityKey(), IdentityKeyStore.Direction.SENDING)) {
throw new UntrustedIdentityException(remoteAddress.getName(), sessionState.getRemoteIdentityKey());
}
identityKeyStore.saveIdentity(remoteAddress, sessionState.getRemoteIdentityKey());
sessionStore.storeSession(remoteAddress, sessionRecord);
return ciphertextMessage;
}
}
/**
* Decrypt a message.
*
* @param ciphertext The {@link PreKeySignalMessage} to decrypt.
*
* @return The plaintext.
* @throws InvalidMessageException if the input is not valid ciphertext.
* @throws DuplicateMessageException if the input is a message that has already been received.
* @throws LegacyMessageException if the input is a message formatted by a protocol version that
* is no longer supported.
* @throws InvalidKeyIdException when there is no local {@link org.whispersystems.libsignal.state.PreKeyRecord}
* that corresponds to the PreKey ID in the message.
* @throws InvalidKeyException when the message is formatted incorrectly.
* @throws UntrustedIdentityException when the {@link IdentityKey} of the sender is untrusted.
*/
public byte[] decrypt(PreKeySignalMessage ciphertext)
throws DuplicateMessageException, LegacyMessageException, InvalidMessageException,
InvalidKeyIdException, InvalidKeyException, UntrustedIdentityException
{
return decrypt(ciphertext, new NullDecryptionCallback());
}
/**
* Decrypt a message.
*
* @param ciphertext The {@link PreKeySignalMessage} to decrypt.
* @param callback A callback that is triggered after decryption is complete,
* but before the updated session state has been committed to the session
* DB. This allows some implementations to store the committed plaintext
* to a DB first, in case they are concerned with a crash happening between
* the time the session state is updated but before they're able to store
* the plaintext to disk.
*
* @return The plaintext.
* @throws InvalidMessageException if the input is not valid ciphertext.
* @throws DuplicateMessageException if the input is a message that has already been received.
* @throws LegacyMessageException if the input is a message formatted by a protocol version that
* is no longer supported.
* @throws InvalidKeyIdException when there is no local {@link org.whispersystems.libsignal.state.PreKeyRecord}
* that corresponds to the PreKey ID in the message.
* @throws InvalidKeyException when the message is formatted incorrectly.
* @throws UntrustedIdentityException when the {@link IdentityKey} of the sender is untrusted.
*/
public byte[] decrypt(PreKeySignalMessage ciphertext, DecryptionCallback callback)
throws DuplicateMessageException, LegacyMessageException, InvalidMessageException,
InvalidKeyIdException, InvalidKeyException, UntrustedIdentityException
{
synchronized (SESSION_LOCK) {
SessionRecord sessionRecord = sessionStore.loadSession(remoteAddress);
Optional<Integer> unsignedPreKeyId = sessionBuilder.process(sessionRecord, ciphertext);
byte[] plaintext = decrypt(sessionRecord, ciphertext.getWhisperMessage());
callback.handlePlaintext(plaintext);
sessionStore.storeSession(remoteAddress, sessionRecord);
if (unsignedPreKeyId.isPresent()) {
preKeyStore.removePreKey(unsignedPreKeyId.get());
}
return plaintext;
}
}
/**
* Decrypt a message.
*
* @param ciphertext The {@link SignalMessage} to decrypt.
*
* @return The plaintext.
* @throws InvalidMessageException if the input is not valid ciphertext.
* @throws DuplicateMessageException if the input is a message that has already been received.
* @throws LegacyMessageException if the input is a message formatted by a protocol version that
* is no longer supported.
* @throws NoSessionException if there is no established session for this contact.
*/
public byte[] decrypt(SignalMessage ciphertext)
throws InvalidMessageException, DuplicateMessageException, LegacyMessageException,
NoSessionException, UntrustedIdentityException
{
return decrypt(ciphertext, new NullDecryptionCallback());
}
/**
* Decrypt a message.
*
* @param ciphertext The {@link SignalMessage} to decrypt.
* @param callback A callback that is triggered after decryption is complete,
* but before the updated session state has been committed to the session
* DB. This allows some implementations to store the committed plaintext
* to a DB first, in case they are concerned with a crash happening between
* the time the session state is updated but before they're able to store
* the plaintext to disk.
*
* @return The plaintext.
* @throws InvalidMessageException if the input is not valid ciphertext.
* @throws DuplicateMessageException if the input is a message that has already been received.
* @throws LegacyMessageException if the input is a message formatted by a protocol version that
* is no longer supported.
* @throws NoSessionException if there is no established session for this contact.
*/
public byte[] decrypt(SignalMessage ciphertext, DecryptionCallback callback)
throws InvalidMessageException, DuplicateMessageException, LegacyMessageException,
NoSessionException, UntrustedIdentityException
{
synchronized (SESSION_LOCK) {
if (!sessionStore.containsSession(remoteAddress)) {
throw new NoSessionException("No session for: " + remoteAddress);
}
SessionRecord sessionRecord = sessionStore.loadSession(remoteAddress);
byte[] plaintext = decrypt(sessionRecord, ciphertext);
if (!identityKeyStore.isTrustedIdentity(remoteAddress, sessionRecord.getSessionState().getRemoteIdentityKey(), IdentityKeyStore.Direction.RECEIVING)) {
throw new UntrustedIdentityException(remoteAddress.getName(), sessionRecord.getSessionState().getRemoteIdentityKey());
}
identityKeyStore.saveIdentity(remoteAddress, sessionRecord.getSessionState().getRemoteIdentityKey());
callback.handlePlaintext(plaintext);
sessionStore.storeSession(remoteAddress, sessionRecord);
return plaintext;
}
}
private byte[] decrypt(SessionRecord sessionRecord, SignalMessage ciphertext)
throws DuplicateMessageException, LegacyMessageException, InvalidMessageException
{
synchronized (SESSION_LOCK) {
Iterator<SessionState> previousStates = sessionRecord.getPreviousSessionStates().iterator();
List<Exception> exceptions = new LinkedList<Exception>();
try {
SessionState sessionState = new SessionState(sessionRecord.getSessionState());
byte[] plaintext = decrypt(sessionState, ciphertext);
sessionRecord.setState(sessionState);
return plaintext;
} catch (InvalidMessageException e) {
exceptions.add(e);
}
while (previousStates.hasNext()) {
try {
SessionState promotedState = new SessionState(previousStates.next());
byte[] plaintext = decrypt(promotedState, ciphertext);
previousStates.remove();
sessionRecord.promoteState(promotedState);
return plaintext;
} catch (InvalidMessageException e) {
exceptions.add(e);
}
}
throw new InvalidMessageException("No valid sessions.", exceptions);
}
}
private byte[] decrypt(SessionState sessionState, SignalMessage ciphertextMessage)
throws InvalidMessageException, DuplicateMessageException, LegacyMessageException
{
if (!sessionState.hasSenderChain()) {
throw new InvalidMessageException("Uninitialized session!");
}
if (ciphertextMessage.getMessageVersion() != sessionState.getSessionVersion()) {
throw new InvalidMessageException(String.format("Message version %d, but session version %d",
ciphertextMessage.getMessageVersion(),
sessionState.getSessionVersion()));
}
ECPublicKey theirEphemeral = ciphertextMessage.getSenderRatchetKey();
int counter = ciphertextMessage.getCounter();
ChainKey chainKey = getOrCreateChainKey(sessionState, theirEphemeral);
MessageKeys messageKeys = getOrCreateMessageKeys(sessionState, theirEphemeral,
chainKey, counter);
ciphertextMessage.verifyMac(sessionState.getRemoteIdentityKey(),
sessionState.getLocalIdentityKey(),
messageKeys.getMacKey());
byte[] plaintext = getPlaintext(messageKeys, ciphertextMessage.getBody());
sessionState.clearUnacknowledgedPreKeyMessage();
return plaintext;
}
public int getRemoteRegistrationId() {
synchronized (SESSION_LOCK) {
SessionRecord record = sessionStore.loadSession(remoteAddress);
return record.getSessionState().getRemoteRegistrationId();
}
}
public int getSessionVersion() {
synchronized (SESSION_LOCK) {
if (!sessionStore.containsSession(remoteAddress)) {
// Loki - If we have no session then we must be using the FallbackSessionCipher
return FallbackSessionCipher.getSessionVersion();
}
SessionRecord record = sessionStore.loadSession(remoteAddress);
return record.getSessionState().getSessionVersion();
}
}
private ChainKey getOrCreateChainKey(SessionState sessionState, ECPublicKey theirEphemeral)
throws InvalidMessageException
{
try {
if (sessionState.hasReceiverChain(theirEphemeral)) {
return sessionState.getReceiverChainKey(theirEphemeral);
} else {
RootKey rootKey = sessionState.getRootKey();
ECKeyPair ourEphemeral = sessionState.getSenderRatchetKeyPair();
Pair<RootKey, ChainKey> receiverChain = rootKey.createChain(theirEphemeral, ourEphemeral);
ECKeyPair ourNewEphemeral = Curve.generateKeyPair();
Pair<RootKey, ChainKey> senderChain = receiverChain.first().createChain(theirEphemeral, ourNewEphemeral);
sessionState.setRootKey(senderChain.first());
sessionState.addReceiverChain(theirEphemeral, receiverChain.second());
sessionState.setPreviousCounter(Math.max(sessionState.getSenderChainKey().getIndex()-1, 0));
sessionState.setSenderChain(ourNewEphemeral, senderChain.second());
return receiverChain.second();
}
} catch (InvalidKeyException e) {
throw new InvalidMessageException(e);
}
}
private MessageKeys getOrCreateMessageKeys(SessionState sessionState,
ECPublicKey theirEphemeral,
ChainKey chainKey, int counter)
throws InvalidMessageException, DuplicateMessageException
{
if (chainKey.getIndex() > counter) {
if (sessionState.hasMessageKeys(theirEphemeral, counter)) {
return sessionState.removeMessageKeys(theirEphemeral, counter);
} else {
throw new DuplicateMessageException("Received message with old counter: " +
chainKey.getIndex() + " , " + counter);
}
}
if (counter - chainKey.getIndex() > 2000) {
throw new InvalidMessageException("Over 2000 messages into the future!");
}
while (chainKey.getIndex() < counter) {
MessageKeys messageKeys = chainKey.getMessageKeys();
sessionState.setMessageKeys(theirEphemeral, messageKeys);
chainKey = chainKey.getNextChainKey();
}
sessionState.setReceiverChainKey(theirEphemeral, chainKey.getNextChainKey());
return chainKey.getMessageKeys();
}
private byte[] getCiphertext(MessageKeys messageKeys, byte[] plaintext) {
try {
Cipher cipher = getCipher(Cipher.ENCRYPT_MODE, messageKeys.getCipherKey(), messageKeys.getIv());
return cipher.doFinal(plaintext);
} catch (IllegalBlockSizeException e) {
throw new AssertionError(e);
} catch (BadPaddingException e) {
throw new AssertionError(e);
}
}
private byte[] getPlaintext(MessageKeys messageKeys, byte[] cipherText)
throws InvalidMessageException
{
try {
Cipher cipher = getCipher(Cipher.DECRYPT_MODE, messageKeys.getCipherKey(), messageKeys.getIv());
return cipher.doFinal(cipherText);
} catch (IllegalBlockSizeException e) {
throw new InvalidMessageException(e);
} catch (BadPaddingException e) {
throw new InvalidMessageException(e);
}
}
private Cipher getCipher(int mode, SecretKeySpec key, IvParameterSpec iv) {
try {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(mode, key, iv);
return cipher;
} catch (NoSuchAlgorithmException e) {
throw new AssertionError(e);
} catch (NoSuchPaddingException e) {
throw new AssertionError(e);
} catch (java.security.InvalidKeyException e) {
throw new AssertionError(e);
} catch (InvalidAlgorithmParameterException e) {
throw new AssertionError(e);
}
}
private static class NullDecryptionCallback implements DecryptionCallback {
@Override
public void handlePlaintext(byte[] plaintext) {}
}
}

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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal;
public class SignalProtocolAddress {
private final String name;
private final int deviceId;
public SignalProtocolAddress(String name, int deviceId) {
this.name = name;
this.deviceId = deviceId;
}
public String getName() {
return name;
}
public int getDeviceId() {
return deviceId;
}
@Override
public String toString() {
return name + ":" + deviceId;
}
@Override
public boolean equals(Object other) {
if (other == null) return false;
if (!(other instanceof SignalProtocolAddress)) return false;
SignalProtocolAddress that = (SignalProtocolAddress)other;
return this.name.equals(that.name) && this.deviceId == that.deviceId;
}
@Override
public int hashCode() {
return this.name.hashCode() ^ this.deviceId;
}
}

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service/java/src/main/java/org/whispersystems/libsignal/StaleKeyExchangeException.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal;
public class StaleKeyExchangeException extends Throwable {
}

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service/java/src/main/java/org/whispersystems/libsignal/UntrustedIdentityException.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal;
public class UntrustedIdentityException extends Exception {
private final String name;
private final IdentityKey key;
public UntrustedIdentityException(String name, IdentityKey key) {
this.name = name;
this.key = key;
}
public IdentityKey getUntrustedIdentity() {
return key;
}
public String getName() {
return name;
}
}

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service/java/src/main/java/org/whispersystems/libsignal/devices/DeviceConsistencyCodeGenerator.java Normal file
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package org.whispersystems.libsignal.devices;
import org.whispersystems.libsignal.util.ByteArrayComparator;
import org.whispersystems.libsignal.util.ByteUtil;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
public class DeviceConsistencyCodeGenerator {
private static final int CODE_VERSION = 0;
public static String generateFor(DeviceConsistencyCommitment commitment,
List<DeviceConsistencySignature> signatures)
{
try {
ArrayList<DeviceConsistencySignature> sortedSignatures = new ArrayList<DeviceConsistencySignature>(signatures);
Collections.sort(sortedSignatures, new SignatureComparator());
MessageDigest messageDigest = MessageDigest.getInstance("SHA-512");
messageDigest.update(ByteUtil.shortToByteArray(CODE_VERSION));
messageDigest.update(commitment.toByteArray());
for (DeviceConsistencySignature signature : sortedSignatures) {
messageDigest.update(signature.getVrfOutput());
}
byte[] hash = messageDigest.digest();
String digits = getEncodedChunk(hash, 0) + getEncodedChunk(hash, 5);
return digits.substring(0, 6);
} catch (NoSuchAlgorithmException e) {
throw new AssertionError(e);
}
}
private static String getEncodedChunk(byte[] hash, int offset) {
long chunk = ByteUtil.byteArray5ToLong(hash, offset) % 100000;
return String.format("%05d", chunk);
}
private static class SignatureComparator extends ByteArrayComparator implements Comparator<DeviceConsistencySignature> {
@Override
public int compare(DeviceConsistencySignature first, DeviceConsistencySignature second) {
return compare(first.getVrfOutput(), second.getVrfOutput());
}
}
}

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package org.whispersystems.libsignal.devices;
import org.whispersystems.libsignal.IdentityKey;
import org.whispersystems.libsignal.util.ByteUtil;
import org.whispersystems.libsignal.util.IdentityKeyComparator;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class DeviceConsistencyCommitment {
private static final String VERSION = "DeviceConsistencyCommitment_V0";
private final int generation;
private final byte[] serialized;
public DeviceConsistencyCommitment(int generation, List<IdentityKey> identityKeys) {
try {
ArrayList<IdentityKey> sortedIdentityKeys = new ArrayList<IdentityKey>(identityKeys);
Collections.sort(sortedIdentityKeys, new IdentityKeyComparator());
MessageDigest messageDigest = MessageDigest.getInstance("SHA-512");
messageDigest.update(VERSION.getBytes());
messageDigest.update(ByteUtil.intToByteArray(generation));
for (IdentityKey commitment : sortedIdentityKeys) {
messageDigest.update(commitment.getPublicKey().serialize());
}
this.generation = generation;
this.serialized = messageDigest.digest();
} catch (NoSuchAlgorithmException e) {
throw new AssertionError(e);
}
}
public byte[] toByteArray() {
return serialized;
}
public int getGeneration() {
return generation;
}
}

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package org.whispersystems.libsignal.devices;
public class DeviceConsistencySignature {
private final byte[] signature;
private final byte[] vrfOutput;
public DeviceConsistencySignature(byte[] signature, byte[] vrfOutput) {
this.signature = signature;
this.vrfOutput = vrfOutput;
}
public byte[] getVrfOutput() {
return vrfOutput;
}
public byte[] getSignature() {
return signature;
}
}

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/**
* Copyright (C) 2013-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.ecc;
import org.whispersystems.curve25519.Curve25519;
import org.whispersystems.curve25519.Curve25519KeyPair;
import org.whispersystems.curve25519.VrfSignatureVerificationFailedException;
import org.whispersystems.libsignal.InvalidKeyException;
import static org.whispersystems.curve25519.Curve25519.BEST;
public class Curve {
public static final int DJB_TYPE = 0x05;
public static boolean isNative() {
return Curve25519.getInstance(BEST).isNative();
}
public static ECKeyPair generateKeyPair(byte[] seed) {
Curve25519KeyPair keyPair = Curve25519.getInstance(BEST).generateKeyPair(seed);
return new ECKeyPair(new DjbECPublicKey(keyPair.getPublicKey()), new DjbECPrivateKey(keyPair.getPrivateKey()));
}
public static ECKeyPair generateKeyPair() {
Curve25519KeyPair keyPair = Curve25519.getInstance(BEST).generateKeyPair();
return new ECKeyPair(new DjbECPublicKey(keyPair.getPublicKey()), new DjbECPrivateKey(keyPair.getPrivateKey()));
}
public static ECPublicKey decodePoint(byte[] bytes, int offset)
throws InvalidKeyException
{
if (bytes == null || bytes.length - offset < 1) {
throw new InvalidKeyException("No key type identifier");
}
int type = bytes[offset] & 0xFF;
switch (type) {
case Curve.DJB_TYPE:
if (bytes.length - offset < 33) {
throw new InvalidKeyException("Bad key length: " + bytes.length);
}
byte[] keyBytes = new byte[32];
System.arraycopy(bytes, offset+1, keyBytes, 0, keyBytes.length);
return new DjbECPublicKey(keyBytes);
default:
throw new InvalidKeyException("Bad key type: " + type);
}
}
public static ECPrivateKey decodePrivatePoint(byte[] bytes) {
return new DjbECPrivateKey(bytes);
}
public static byte[] calculateAgreement(ECPublicKey publicKey, ECPrivateKey privateKey)
throws InvalidKeyException
{
if (publicKey == null) {
throw new InvalidKeyException("public value is null");
}
if (privateKey == null) {
throw new InvalidKeyException("private value is null");
}
if (publicKey.getType() != privateKey.getType()) {
throw new InvalidKeyException("Public and private keys must be of the same type!");
}
if (publicKey.getType() == DJB_TYPE) {
return Curve25519.getInstance(BEST)
.calculateAgreement(((DjbECPublicKey) publicKey).getPublicKey(),
((DjbECPrivateKey) privateKey).getPrivateKey());
} else {
throw new InvalidKeyException("Unknown type: " + publicKey.getType());
}
}
public static boolean verifySignature(ECPublicKey signingKey, byte[] message, byte[] signature)
throws InvalidKeyException
{
if (signingKey == null || message == null || signature == null) {
throw new InvalidKeyException("Values must not be null");
}
if (signingKey.getType() == DJB_TYPE) {
return Curve25519.getInstance(BEST)
.verifySignature(((DjbECPublicKey) signingKey).getPublicKey(), message, signature);
} else {
throw new InvalidKeyException("Unknown type: " + signingKey.getType());
}
}
public static byte[] calculateSignature(ECPrivateKey signingKey, byte[] message)
throws InvalidKeyException
{
if (signingKey == null || message == null) {
throw new InvalidKeyException("Values must not be null");
}
if (signingKey.getType() == DJB_TYPE) {
return Curve25519.getInstance(BEST)
.calculateSignature(((DjbECPrivateKey) signingKey).getPrivateKey(), message);
} else {
throw new InvalidKeyException("Unknown type: " + signingKey.getType());
}
}
public static byte[] calculateVrfSignature(ECPrivateKey signingKey, byte[] message)
throws InvalidKeyException
{
if (signingKey == null || message == null) {
throw new InvalidKeyException("Values must not be null");
}
if (signingKey.getType() == DJB_TYPE) {
return Curve25519.getInstance(BEST)
.calculateVrfSignature(((DjbECPrivateKey)signingKey).getPrivateKey(), message);
} else {
throw new InvalidKeyException("Unknown type: " + signingKey.getType());
}
}
public static byte[] verifyVrfSignature(ECPublicKey signingKey, byte[] message, byte[] signature)
throws InvalidKeyException, VrfSignatureVerificationFailedException
{
if (signingKey == null || message == null || signature == null) {
throw new InvalidKeyException("Values must not be null");
}
if (signingKey.getType() == DJB_TYPE) {
return Curve25519.getInstance(BEST)
.verifyVrfSignature(((DjbECPublicKey) signingKey).getPublicKey(), message, signature);
} else {
throw new InvalidKeyException("Unknown type: " + signingKey.getType());
}
}
}

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service/java/src/main/java/org/whispersystems/libsignal/ecc/DjbECPrivateKey.java Normal file
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/**
* Copyright (C) 2013-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.ecc;
public class DjbECPrivateKey implements ECPrivateKey {
private final byte[] privateKey;
public DjbECPrivateKey(byte[] privateKey) {
this.privateKey = privateKey;
}
@Override
public byte[] serialize() {
return privateKey;
}
@Override
public int getType() {
return Curve.DJB_TYPE;
}
public byte[] getPrivateKey() {
return privateKey;
}
}

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service/java/src/main/java/org/whispersystems/libsignal/ecc/DjbECPublicKey.java Normal file
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/**
* Copyright (C) 2013-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.ecc;
import org.whispersystems.libsignal.util.ByteUtil;
import java.math.BigInteger;
import java.util.Arrays;
public class DjbECPublicKey implements ECPublicKey {
private final byte[] publicKey;
public DjbECPublicKey(byte[] publicKey) {
this.publicKey = publicKey;
}
@Override
public byte[] serialize() {
byte[] type = {Curve.DJB_TYPE};
return ByteUtil.combine(type, publicKey);
}
@Override
public int getType() {
return Curve.DJB_TYPE;
}
@Override
public boolean equals(Object other) {
if (other == null) return false;
if (!(other instanceof DjbECPublicKey)) return false;
DjbECPublicKey that = (DjbECPublicKey)other;
return Arrays.equals(this.publicKey, that.publicKey);
}
@Override
public int hashCode() {
return Arrays.hashCode(publicKey);
}
@Override
public int compareTo(ECPublicKey another) {
return new BigInteger(publicKey).compareTo(new BigInteger(((DjbECPublicKey)another).publicKey));
}
public byte[] getPublicKey() {
return publicKey;
}
}

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service/java/src/main/java/org/whispersystems/libsignal/ecc/ECKeyPair.java Normal file
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/**
* Copyright (C) 2013-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.ecc;
public class ECKeyPair {
private final ECPublicKey publicKey;
private final ECPrivateKey privateKey;
public ECKeyPair(ECPublicKey publicKey, ECPrivateKey privateKey) {
this.publicKey = publicKey;
this.privateKey = privateKey;
}
public ECPublicKey getPublicKey() {
return publicKey;
}
public ECPrivateKey getPrivateKey() {
return privateKey;
}
}

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service/java/src/main/java/org/whispersystems/libsignal/ecc/ECPrivateKey.java Normal file
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/**
* Copyright (C) 2013-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.ecc;
public interface ECPrivateKey {
public byte[] serialize();
public int getType();
}

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service/java/src/main/java/org/whispersystems/libsignal/ecc/ECPublicKey.java Normal file
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/**
* Copyright (C) 2013-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.ecc;
public interface ECPublicKey extends Comparable<ECPublicKey> {
public static final int KEY_SIZE = 33;
public byte[] serialize();
public int getType();
}

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service/java/src/main/java/org/whispersystems/libsignal/fingerprint/DisplayableFingerprint.java Normal file
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/**
* Copyright (C) 2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.fingerprint;
import org.whispersystems.libsignal.util.ByteUtil;
public class DisplayableFingerprint {
private final String localFingerprintNumbers;
private final String remoteFingerprintNumbers;
DisplayableFingerprint(byte[] localFingerprint, byte[] remoteFingerprint)
{
this.localFingerprintNumbers = getDisplayStringFor(localFingerprint);
this.remoteFingerprintNumbers = getDisplayStringFor(remoteFingerprint);
}
public String getDisplayText() {
if (localFingerprintNumbers.compareTo(remoteFingerprintNumbers) <= 0) {
return localFingerprintNumbers + remoteFingerprintNumbers;
} else {
return remoteFingerprintNumbers + localFingerprintNumbers;
}
}
private String getDisplayStringFor(byte[] fingerprint) {
return getEncodedChunk(fingerprint, 0) +
getEncodedChunk(fingerprint, 5) +
getEncodedChunk(fingerprint, 10) +
getEncodedChunk(fingerprint, 15) +
getEncodedChunk(fingerprint, 20) +
getEncodedChunk(fingerprint, 25);
}
private String getEncodedChunk(byte[] hash, int offset) {
long chunk = ByteUtil.byteArray5ToLong(hash, offset) % 100000;
return String.format("%05d", chunk);
}
}

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service/java/src/main/java/org/whispersystems/libsignal/fingerprint/Fingerprint.java Normal file
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/**
* Copyright (C) 2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.fingerprint;
public class Fingerprint {
private final DisplayableFingerprint displayableFingerprint;
private final ScannableFingerprint scannableFingerprint;
public Fingerprint(DisplayableFingerprint displayableFingerprint,
ScannableFingerprint scannableFingerprint)
{
this.displayableFingerprint = displayableFingerprint;
this.scannableFingerprint = scannableFingerprint;
}
/**
* @return A text fingerprint that can be displayed and compared remotely.
*/
public DisplayableFingerprint getDisplayableFingerprint() {
return displayableFingerprint;
}
/**
* @return A scannable fingerprint that can be scanned anc compared locally.
*/
public ScannableFingerprint getScannableFingerprint() {
return scannableFingerprint;
}
}

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service/java/src/main/java/org/whispersystems/libsignal/fingerprint/FingerprintGenerator.java Normal file
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/**
* Copyright (C) 2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.fingerprint;
import org.whispersystems.libsignal.IdentityKey;
import java.util.List;
public interface FingerprintGenerator {
public Fingerprint createFor(String localStableIdentifier, IdentityKey localIdentityKey,
String remoteStableIdentifier, IdentityKey remoteIdentityKey);
public Fingerprint createFor(String localStableIdentifier, List<IdentityKey> localIdentityKey,
String remoteStableIdentifier, List<IdentityKey> remoteIdentityKey);
}

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service/java/src/main/java/org/whispersystems/libsignal/fingerprint/FingerprintIdentifierMismatchException.java Normal file
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/**
* Copyright (C) 2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.fingerprint;
public class FingerprintIdentifierMismatchException extends Exception {
private final String localIdentifier;
private final String remoteIdentifier;
private final String scannedLocalIdentifier;
private final String scannedRemoteIdentifier;
public FingerprintIdentifierMismatchException(String localIdentifier, String remoteIdentifier,
String scannedLocalIdentifier, String scannedRemoteIdentifier)
{
this.localIdentifier = localIdentifier;
this.remoteIdentifier = remoteIdentifier;
this.scannedLocalIdentifier = scannedLocalIdentifier;
this.scannedRemoteIdentifier = scannedRemoteIdentifier;
}
public String getScannedRemoteIdentifier() {
return scannedRemoteIdentifier;
}
public String getScannedLocalIdentifier() {
return scannedLocalIdentifier;
}
public String getRemoteIdentifier() {
return remoteIdentifier;
}
public String getLocalIdentifier() {
return localIdentifier;
}
}

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service/java/src/main/java/org/whispersystems/libsignal/fingerprint/FingerprintParsingException.java Normal file
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/**
* Copyright (C) 2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.fingerprint;
public class FingerprintParsingException extends Exception {
public FingerprintParsingException(Exception nested) {
super(nested);
}
}

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service/java/src/main/java/org/whispersystems/libsignal/fingerprint/FingerprintVersionMismatchException.java Normal file
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/**
* Copyright (C) 2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.fingerprint;
public class FingerprintVersionMismatchException extends Exception {
private final int theirVersion;
private final int ourVersion;
public FingerprintVersionMismatchException(int theirVersion, int ourVersion) {
super();
this.theirVersion = theirVersion;
this.ourVersion = ourVersion;
}
public int getTheirVersion() {
return theirVersion;
}
public int getOurVersion() {
return ourVersion;
}
}

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service/java/src/main/java/org/whispersystems/libsignal/fingerprint/NumericFingerprintGenerator.java Normal file
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/**
* Copyright (C) 2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.fingerprint;
import org.whispersystems.libsignal.IdentityKey;
import org.whispersystems.libsignal.util.ByteUtil;
import org.whispersystems.libsignal.util.IdentityKeyComparator;
import java.io.ByteArrayOutputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
public class NumericFingerprintGenerator implements FingerprintGenerator {
private static final int FINGERPRINT_VERSION = 0;
private final int iterations;
/**
* Construct a fingerprint generator for 60 digit numerics.
*
* @param iterations The number of internal iterations to perform in the process of
* generating a fingerprint. This needs to be constant, and synchronized
* across all clients.
*
* The higher the iteration count, the higher the security level:
*
* - 1024 ~ 109.7 bits
* - 1400 > 110 bits
* - 5200 > 112 bits
*/
public NumericFingerprintGenerator(int iterations) {
this.iterations = iterations;
}
/**
* Generate a scannable and displayble fingerprint.
*
* @param localStableIdentifier The client's "stable" identifier.
* @param localIdentityKey The client's identity key.
* @param remoteStableIdentifier The remote party's "stable" identifier.
* @param remoteIdentityKey The remote party's identity key.
* @return A unique fingerprint for this conversation.
*/
@Override
public Fingerprint createFor(String localStableIdentifier, final IdentityKey localIdentityKey,
String remoteStableIdentifier, final IdentityKey remoteIdentityKey)
{
return createFor(localStableIdentifier,
new LinkedList<IdentityKey>() {{
add(localIdentityKey);
}},
remoteStableIdentifier,
new LinkedList<IdentityKey>() {{
add(remoteIdentityKey);
}});
}
/**
* Generate a scannable and displayble fingerprint for logical identities that have multiple
* physical keys.
*
* Do not trust the output of this unless you've been through the device consistency process
* for the provided localIdentityKeys.
*
* @param localStableIdentifier The client's "stable" identifier.
* @param localIdentityKeys The client's collection of physical identity keys.
* @param remoteStableIdentifier The remote party's "stable" identifier.
* @param remoteIdentityKeys The remote party's collection of physical identity key.
* @return A unique fingerprint for this conversation.
*/
public Fingerprint createFor(String localStableIdentifier, List<IdentityKey> localIdentityKeys,
String remoteStableIdentifier, List<IdentityKey> remoteIdentityKeys)
{
byte[] localFingerprint = getFingerprint(iterations, localStableIdentifier, localIdentityKeys);
byte[] remoteFingerprint = getFingerprint(iterations, remoteStableIdentifier, remoteIdentityKeys);
DisplayableFingerprint displayableFingerprint = new DisplayableFingerprint(localFingerprint,
remoteFingerprint);
ScannableFingerprint scannableFingerprint = new ScannableFingerprint(localFingerprint,
remoteFingerprint);
return new Fingerprint(displayableFingerprint, scannableFingerprint);
}
private byte[] getFingerprint(int iterations, String stableIdentifier, List<IdentityKey> unsortedIdentityKeys) {
try {
MessageDigest digest = MessageDigest.getInstance("SHA-512");
byte[] publicKey = getLogicalKeyBytes(unsortedIdentityKeys);
byte[] hash = ByteUtil.combine(ByteUtil.shortToByteArray(FINGERPRINT_VERSION),
publicKey, stableIdentifier.getBytes());
for (int i=0;i<iterations;i++) {
digest.update(hash);
hash = digest.digest(publicKey);
}
return hash;
} catch (NoSuchAlgorithmException e) {
throw new AssertionError(e);
}
}
private byte[] getLogicalKeyBytes(List<IdentityKey> identityKeys) {
ArrayList<IdentityKey> sortedIdentityKeys = new ArrayList<IdentityKey>(identityKeys);
Collections.sort(sortedIdentityKeys, new IdentityKeyComparator());
ByteArrayOutputStream baos = new ByteArrayOutputStream();
for (IdentityKey identityKey : sortedIdentityKeys) {
byte[] publicKeyBytes = identityKey.getPublicKey().serialize();
baos.write(publicKeyBytes, 0, publicKeyBytes.length);
}
return baos.toByteArray();
}
}

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service/java/src/main/java/org/whispersystems/libsignal/fingerprint/ScannableFingerprint.java Normal file
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/**
* Copyright (C) 2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.fingerprint;
import com.google.protobuf.ByteString;
import com.google.protobuf.InvalidProtocolBufferException;
import org.whispersystems.libsignal.fingerprint.FingerprintProtos.CombinedFingerprints;
import org.whispersystems.libsignal.fingerprint.FingerprintProtos.LogicalFingerprint;
import org.whispersystems.libsignal.util.ByteUtil;
import java.security.MessageDigest;
public class ScannableFingerprint {
private static final int VERSION = 1;
private final CombinedFingerprints fingerprints;
ScannableFingerprint(byte[] localFingerprintData, byte[] remoteFingerprintData)
{
LogicalFingerprint localFingerprint = LogicalFingerprint.newBuilder()
.setContent(ByteString.copyFrom(ByteUtil.trim(localFingerprintData, 32)))
.build();
LogicalFingerprint remoteFingerprint = LogicalFingerprint.newBuilder()
.setContent(ByteString.copyFrom(ByteUtil.trim(remoteFingerprintData, 32)))
.build();
this.fingerprints = CombinedFingerprints.newBuilder()
.setVersion(VERSION)
.setLocalFingerprint(localFingerprint)
.setRemoteFingerprint(remoteFingerprint)
.build();
}
/**
* @return A byte string to be displayed in a QR code.
*/
public byte[] getSerialized() {
return fingerprints.toByteArray();
}
/**
* Compare a scanned QR code with what we expect.
*
* @param scannedFingerprintData The scanned data
* @return True if matching, otehrwise false.
* @throws FingerprintVersionMismatchException if the scanned fingerprint is the wrong version.
*/
public boolean compareTo(byte[] scannedFingerprintData)
throws FingerprintVersionMismatchException,
FingerprintParsingException
{
try {
CombinedFingerprints scanned = CombinedFingerprints.parseFrom(scannedFingerprintData);
if (!scanned.hasRemoteFingerprint() || !scanned.hasLocalFingerprint() ||
!scanned.hasVersion() || scanned.getVersion() != VERSION)
{
throw new FingerprintVersionMismatchException(scanned.getVersion(), VERSION);
}
return MessageDigest.isEqual(fingerprints.getLocalFingerprint().getContent().toByteArray(), scanned.getRemoteFingerprint().getContent().toByteArray()) &&
MessageDigest.isEqual(fingerprints.getRemoteFingerprint().getContent().toByteArray(), scanned.getLocalFingerprint().getContent().toByteArray());
} catch (InvalidProtocolBufferException e) {
throw new FingerprintParsingException(e);
}
}
}

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service/java/src/main/java/org/whispersystems/libsignal/groups/GroupCipher.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.groups;
import org.whispersystems.libsignal.DecryptionCallback;
import org.whispersystems.libsignal.DuplicateMessageException;
import org.whispersystems.libsignal.InvalidKeyIdException;
import org.whispersystems.libsignal.InvalidMessageException;
import org.whispersystems.libsignal.LegacyMessageException;
import org.whispersystems.libsignal.NoSessionException;
import org.whispersystems.libsignal.groups.ratchet.SenderChainKey;
import org.whispersystems.libsignal.groups.ratchet.SenderMessageKey;
import org.whispersystems.libsignal.groups.state.SenderKeyRecord;
import org.whispersystems.libsignal.groups.state.SenderKeyState;
import org.whispersystems.libsignal.groups.state.SenderKeyStore;
import org.whispersystems.libsignal.protocol.SenderKeyMessage;
import java.security.InvalidAlgorithmParameterException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
/**
* The main entry point for Signal Protocol group encrypt/decrypt operations.
*
* Once a session has been established with {@link org.whispersystems.libsignal.groups.GroupSessionBuilder}
* and a {@link org.whispersystems.libsignal.protocol.SenderKeyDistributionMessage} has been
* distributed to each member of the group, this class can be used for all subsequent encrypt/decrypt
* operations within that session (ie: until group membership changes).
*
* @author Moxie Marlinspike
*/
public class GroupCipher {
static final Object LOCK = new Object();
private final SenderKeyStore senderKeyStore;
private final SenderKeyName senderKeyId;
public GroupCipher(SenderKeyStore senderKeyStore, SenderKeyName senderKeyId) {
this.senderKeyStore = senderKeyStore;
this.senderKeyId = senderKeyId;
}
/**
* Encrypt a message.
*
* @param paddedPlaintext The plaintext message bytes, optionally padded.
* @return Ciphertext.
* @throws NoSessionException
*/
public byte[] encrypt(byte[] paddedPlaintext) throws NoSessionException {
synchronized (LOCK) {
try {
SenderKeyRecord record = senderKeyStore.loadSenderKey(senderKeyId);
SenderKeyState senderKeyState = record.getSenderKeyState();
SenderMessageKey senderKey = senderKeyState.getSenderChainKey().getSenderMessageKey();
byte[] ciphertext = getCipherText(senderKey.getIv(), senderKey.getCipherKey(), paddedPlaintext);
SenderKeyMessage senderKeyMessage = new SenderKeyMessage(senderKeyState.getKeyId(),
senderKey.getIteration(),
ciphertext,
senderKeyState.getSigningKeyPrivate());
senderKeyState.setSenderChainKey(senderKeyState.getSenderChainKey().getNext());
senderKeyStore.storeSenderKey(senderKeyId, record);
return senderKeyMessage.serialize();
} catch (InvalidKeyIdException e) {
throw new NoSessionException(e);
}
}
}
/**
* Decrypt a SenderKey group message.
*
* @param senderKeyMessageBytes The received ciphertext.
* @return Plaintext
* @throws LegacyMessageException
* @throws InvalidMessageException
* @throws DuplicateMessageException
*/
public byte[] decrypt(byte[] senderKeyMessageBytes)
throws LegacyMessageException, DuplicateMessageException, InvalidMessageException, NoSessionException
{
return decrypt(senderKeyMessageBytes, new NullDecryptionCallback());
}
/**
* Decrypt a SenderKey group message.
*
* @param senderKeyMessageBytes The received ciphertext.
* @param callback A callback that is triggered after decryption is complete,
* but before the updated session state has been committed to the session
* DB. This allows some implementations to store the committed plaintext
* to a DB first, in case they are concerned with a crash happening between
* the time the session state is updated but before they're able to store
* the plaintext to disk.
* @return Plaintext
* @throws LegacyMessageException
* @throws InvalidMessageException
* @throws DuplicateMessageException
*/
public byte[] decrypt(byte[] senderKeyMessageBytes, DecryptionCallback callback)
throws LegacyMessageException, InvalidMessageException, DuplicateMessageException,
NoSessionException
{
synchronized (LOCK) {
try {
SenderKeyRecord record = senderKeyStore.loadSenderKey(senderKeyId);
if (record.isEmpty()) {
throw new NoSessionException("No sender key for: " + senderKeyId);
}
SenderKeyMessage senderKeyMessage = new SenderKeyMessage(senderKeyMessageBytes);
SenderKeyState senderKeyState = record.getSenderKeyState(senderKeyMessage.getKeyId());
senderKeyMessage.verifySignature(senderKeyState.getSigningKeyPublic());
SenderMessageKey senderKey = getSenderKey(senderKeyState, senderKeyMessage.getIteration());
byte[] plaintext = getPlainText(senderKey.getIv(), senderKey.getCipherKey(), senderKeyMessage.getCipherText());
callback.handlePlaintext(plaintext);
senderKeyStore.storeSenderKey(senderKeyId, record);
return plaintext;
} catch (org.whispersystems.libsignal.InvalidKeyException e) {
throw new InvalidMessageException(e);
} catch (InvalidKeyIdException e) {
throw new InvalidMessageException(e);
}
}
}
private SenderMessageKey getSenderKey(SenderKeyState senderKeyState, int iteration)
throws DuplicateMessageException, InvalidMessageException
{
SenderChainKey senderChainKey = senderKeyState.getSenderChainKey();
if (senderChainKey.getIteration() > iteration) {
if (senderKeyState.hasSenderMessageKey(iteration)) {
return senderKeyState.removeSenderMessageKey(iteration);
} else {
throw new DuplicateMessageException("Received message with old counter: " +
senderChainKey.getIteration() + " , " + iteration);
}
}
if (iteration - senderChainKey.getIteration() > 2000) {
throw new InvalidMessageException("Over 2000 messages into the future!");
}
while (senderChainKey.getIteration() < iteration) {
senderKeyState.addSenderMessageKey(senderChainKey.getSenderMessageKey());
senderChainKey = senderChainKey.getNext();
}
senderKeyState.setSenderChainKey(senderChainKey.getNext());
return senderChainKey.getSenderMessageKey();
}
private byte[] getPlainText(byte[] iv, byte[] key, byte[] ciphertext)
throws InvalidMessageException
{
try {
IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(key, "AES"), ivParameterSpec);
return cipher.doFinal(ciphertext);
} catch (NoSuchAlgorithmException e) {
throw new AssertionError(e);
} catch (NoSuchPaddingException e) {
throw new AssertionError(e);
} catch(java.security.InvalidKeyException e) {
throw new AssertionError(e);
} catch (InvalidAlgorithmParameterException e) {
throw new AssertionError(e);
} catch (IllegalBlockSizeException e) {
throw new InvalidMessageException(e);
} catch (BadPaddingException e) {
throw new InvalidMessageException(e);
}
}
private byte[] getCipherText(byte[] iv, byte[] key, byte[] plaintext) {
try {
IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key, "AES"), ivParameterSpec);
return cipher.doFinal(plaintext);
} catch (NoSuchAlgorithmException e) {
throw new AssertionError(e);
} catch (NoSuchPaddingException e) {
throw new AssertionError(e);
} catch (InvalidAlgorithmParameterException e) {
throw new AssertionError(e);
} catch (IllegalBlockSizeException e) {
throw new AssertionError(e);
} catch (BadPaddingException e) {
throw new AssertionError(e);
} catch (java.security.InvalidKeyException e) {
throw new AssertionError(e);
}
}
private static class NullDecryptionCallback implements DecryptionCallback {
@Override
public void handlePlaintext(byte[] plaintext) {}
}
}

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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.groups;
import org.whispersystems.libsignal.InvalidKeyException;
import org.whispersystems.libsignal.InvalidKeyIdException;
import org.whispersystems.libsignal.groups.state.SenderKeyRecord;
import org.whispersystems.libsignal.groups.state.SenderKeyState;
import org.whispersystems.libsignal.groups.state.SenderKeyStore;
import org.whispersystems.libsignal.protocol.SenderKeyDistributionMessage;
import org.whispersystems.libsignal.util.KeyHelper;
/**
* GroupSessionBuilder is responsible for setting up group SenderKey encrypted sessions.
*
* Once a session has been established, {@link org.whispersystems.libsignal.groups.GroupCipher}
* can be used to encrypt/decrypt messages in that session.
* <p>
* The built sessions are unidirectional: they can be used either for sending or for receiving,
* but not both.
*
* Sessions are constructed per (groupId + senderId + deviceId) tuple. Remote logical users
* are identified by their senderId, and each logical recipientId can have multiple physical
* devices.
*
* @author Moxie Marlinspike
*/
public class GroupSessionBuilder {
private final SenderKeyStore senderKeyStore;
public GroupSessionBuilder(SenderKeyStore senderKeyStore) {
this.senderKeyStore = senderKeyStore;
}
/**
* Construct a group session for receiving messages from senderKeyName.
*
* @param senderKeyName The (groupId, senderId, deviceId) tuple associated with the SenderKeyDistributionMessage.
* @param senderKeyDistributionMessage A received SenderKeyDistributionMessage.
*/
public void process(SenderKeyName senderKeyName, SenderKeyDistributionMessage senderKeyDistributionMessage) {
synchronized (GroupCipher.LOCK) {
SenderKeyRecord senderKeyRecord = senderKeyStore.loadSenderKey(senderKeyName);
senderKeyRecord.addSenderKeyState(senderKeyDistributionMessage.getId(),
senderKeyDistributionMessage.getIteration(),
senderKeyDistributionMessage.getChainKey(),
senderKeyDistributionMessage.getSignatureKey());
senderKeyStore.storeSenderKey(senderKeyName, senderKeyRecord);
}
}
/**
* Construct a group session for sending messages.
*
* @param senderKeyName The (groupId, senderId, deviceId) tuple. In this case, 'senderId' should be the caller.
* @return A SenderKeyDistributionMessage that is individually distributed to each member of the group.
*/
public SenderKeyDistributionMessage create(SenderKeyName senderKeyName) {
synchronized (GroupCipher.LOCK) {
try {
SenderKeyRecord senderKeyRecord = senderKeyStore.loadSenderKey(senderKeyName);
if (senderKeyRecord.isEmpty()) {
senderKeyRecord.setSenderKeyState(KeyHelper.generateSenderKeyId(),
0,
KeyHelper.generateSenderKey(),
KeyHelper.generateSenderSigningKey());
senderKeyStore.storeSenderKey(senderKeyName, senderKeyRecord);
}
SenderKeyState state = senderKeyRecord.getSenderKeyState();
return new SenderKeyDistributionMessage(state.getKeyId(),
state.getSenderChainKey().getIteration(),
state.getSenderChainKey().getSeed(),
state.getSigningKeyPublic());
} catch (InvalidKeyIdException e) {
throw new AssertionError(e);
} catch (InvalidKeyException e) {
throw new AssertionError(e);
}
}
}
}

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service/java/src/main/java/org/whispersystems/libsignal/groups/SenderKeyName.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.groups;
import org.whispersystems.libsignal.SignalProtocolAddress;
/**
* A representation of a (groupId + senderId + deviceId) tuple.
*/
public class SenderKeyName {
private final String groupId;
private final SignalProtocolAddress sender;
public SenderKeyName(String groupId, SignalProtocolAddress sender) {
this.groupId = groupId;
this.sender = sender;
}
public String getGroupId() {
return groupId;
}
public SignalProtocolAddress getSender() {
return sender;
}
public String serialize() {
return groupId + "::" + sender.getName() + "::" + String.valueOf(sender.getDeviceId());
}
@Override
public boolean equals(Object other) {
if (other == null) return false;
if (!(other instanceof SenderKeyName)) return false;
SenderKeyName that = (SenderKeyName)other;
return
this.groupId.equals(that.groupId) &&
this.sender.equals(that.sender);
}
@Override
public int hashCode() {
return this.groupId.hashCode() ^ this.sender.hashCode();
}
}

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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.groups.ratchet;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
/**
* Each SenderKey is a "chain" of keys, each derived from the previous.
*
* At any given point in time, the state of a SenderKey can be represented
* as the current chain key value, along with its iteration count. From there,
* subsequent iterations can be derived, as well as individual message keys from
* each chain key.
*
* @author Moxie Marlinspike
*/
public class SenderChainKey {
private static final byte[] MESSAGE_KEY_SEED = {0x01};
private static final byte[] CHAIN_KEY_SEED = {0x02};
private final int iteration;
private final byte[] chainKey;
public SenderChainKey(int iteration, byte[] chainKey) {
this.iteration = iteration;
this.chainKey = chainKey;
}
public int getIteration() {
return iteration;
}
public SenderMessageKey getSenderMessageKey() {
return new SenderMessageKey(iteration, getDerivative(MESSAGE_KEY_SEED, chainKey));
}
public SenderChainKey getNext() {
return new SenderChainKey(iteration + 1, getDerivative(CHAIN_KEY_SEED, chainKey));
}
public byte[] getSeed() {
return chainKey;
}
private byte[] getDerivative(byte[] seed, byte[] key) {
try {
Mac mac = Mac.getInstance("HmacSHA256");
mac.init(new SecretKeySpec(key, "HmacSHA256"));
return mac.doFinal(seed);
} catch (NoSuchAlgorithmException e) {
throw new AssertionError(e);
} catch (InvalidKeyException e) {
throw new AssertionError(e);
}
}
}

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service/java/src/main/java/org/whispersystems/libsignal/groups/ratchet/SenderMessageKey.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.groups.ratchet;
import org.whispersystems.libsignal.kdf.HKDFv3;
import org.whispersystems.libsignal.util.ByteUtil;
/**
* The final symmetric material (IV and Cipher Key) used for encrypting
* individual SenderKey messages.
*
* @author Moxie Marlinspike
*/
public class SenderMessageKey {
private final int iteration;
private final byte[] iv;
private final byte[] cipherKey;
private final byte[] seed;
public SenderMessageKey(int iteration, byte[] seed) {
byte[] derivative = new HKDFv3().deriveSecrets(seed, "WhisperGroup".getBytes(), 48);
byte[][] parts = ByteUtil.split(derivative, 16, 32);
this.iteration = iteration;
this.seed = seed;
this.iv = parts[0];
this.cipherKey = parts[1];
}
public int getIteration() {
return iteration;
}
public byte[] getIv() {
return iv;
}
public byte[] getCipherKey() {
return cipherKey;
}
public byte[] getSeed() {
return seed;
}
}

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service/java/src/main/java/org/whispersystems/libsignal/groups/state/SenderKeyRecord.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.groups.state;
import org.whispersystems.libsignal.InvalidKeyIdException;
import org.whispersystems.libsignal.ecc.ECKeyPair;
import org.whispersystems.libsignal.ecc.ECPublicKey;
import org.whispersystems.libsignal.state.StorageProtos;
import java.io.IOException;
import java.util.LinkedList;
import java.util.List;
import static org.whispersystems.libsignal.state.StorageProtos.SenderKeyRecordStructure;
/**
* A durable representation of a set of SenderKeyStates for a specific
* SenderKeyName.
*
* @author Moxie Marlisnpike
*/
public class SenderKeyRecord {
private static final int MAX_STATES = 5;
private LinkedList<SenderKeyState> senderKeyStates = new LinkedList<SenderKeyState>();
public SenderKeyRecord() {}
public SenderKeyRecord(byte[] serialized) throws IOException {
SenderKeyRecordStructure senderKeyRecordStructure = SenderKeyRecordStructure.parseFrom(serialized);
for (StorageProtos.SenderKeyStateStructure structure : senderKeyRecordStructure.getSenderKeyStatesList()) {
this.senderKeyStates.add(new SenderKeyState(structure));
}
}
public boolean isEmpty() {
return senderKeyStates.isEmpty();
}
public SenderKeyState getSenderKeyState() throws InvalidKeyIdException {
if (!senderKeyStates.isEmpty()) {
return senderKeyStates.get(0);
} else {
throw new InvalidKeyIdException("No key state in record!");
}
}
public SenderKeyState getSenderKeyState(int keyId) throws InvalidKeyIdException {
for (SenderKeyState state : senderKeyStates) {
if (state.getKeyId() == keyId) {
return state;
}
}
throw new InvalidKeyIdException("No keys for: " + keyId);
}
public void addSenderKeyState(int id, int iteration, byte[] chainKey, ECPublicKey signatureKey) {
senderKeyStates.addFirst(new SenderKeyState(id, iteration, chainKey, signatureKey));
if (senderKeyStates.size() > MAX_STATES) {
senderKeyStates.removeLast();
}
}
public void setSenderKeyState(int id, int iteration, byte[] chainKey, ECKeyPair signatureKey) {
senderKeyStates.clear();
senderKeyStates.add(new SenderKeyState(id, iteration, chainKey, signatureKey));
}
public byte[] serialize() {
SenderKeyRecordStructure.Builder recordStructure = SenderKeyRecordStructure.newBuilder();
for (SenderKeyState senderKeyState : senderKeyStates) {
recordStructure.addSenderKeyStates(senderKeyState.getStructure());
}
return recordStructure.build().toByteArray();
}
}

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service/java/src/main/java/org/whispersystems/libsignal/groups/state/SenderKeyState.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.groups.state;
import com.google.protobuf.ByteString;
import org.whispersystems.libsignal.InvalidKeyException;
import org.whispersystems.libsignal.ecc.Curve;
import org.whispersystems.libsignal.ecc.ECKeyPair;
import org.whispersystems.libsignal.ecc.ECPrivateKey;
import org.whispersystems.libsignal.ecc.ECPublicKey;
import org.whispersystems.libsignal.groups.ratchet.SenderChainKey;
import org.whispersystems.libsignal.groups.ratchet.SenderMessageKey;
import org.whispersystems.libsignal.util.guava.Optional;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import static org.whispersystems.libsignal.state.StorageProtos.SenderKeyStateStructure;
/**
* Represents the state of an individual SenderKey ratchet.
*
* @author Moxie Marlinspike
*/
public class SenderKeyState {
private static final int MAX_MESSAGE_KEYS = 2000;
private SenderKeyStateStructure senderKeyStateStructure;
public SenderKeyState(int id, int iteration, byte[] chainKey, ECPublicKey signatureKey) {
this(id, iteration, chainKey, signatureKey, Optional.<ECPrivateKey>absent());
}
public SenderKeyState(int id, int iteration, byte[] chainKey, ECKeyPair signatureKey) {
this(id, iteration, chainKey, signatureKey.getPublicKey(), Optional.of(signatureKey.getPrivateKey()));
}
private SenderKeyState(int id, int iteration, byte[] chainKey,
ECPublicKey signatureKeyPublic,
Optional<ECPrivateKey> signatureKeyPrivate)
{
SenderKeyStateStructure.SenderChainKey senderChainKeyStructure =
SenderKeyStateStructure.SenderChainKey.newBuilder()
.setIteration(iteration)
.setSeed(ByteString.copyFrom(chainKey))
.build();
SenderKeyStateStructure.SenderSigningKey.Builder signingKeyStructure =
SenderKeyStateStructure.SenderSigningKey.newBuilder()
.setPublic(ByteString.copyFrom(signatureKeyPublic.serialize()));
if (signatureKeyPrivate.isPresent()) {
signingKeyStructure.setPrivate(ByteString.copyFrom(signatureKeyPrivate.get().serialize()));
}
this.senderKeyStateStructure = SenderKeyStateStructure.newBuilder()
.setSenderKeyId(id)
.setSenderChainKey(senderChainKeyStructure)
.setSenderSigningKey(signingKeyStructure)
.build();
}
public SenderKeyState(SenderKeyStateStructure senderKeyStateStructure) {
this.senderKeyStateStructure = senderKeyStateStructure;
}
public int getKeyId() {
return senderKeyStateStructure.getSenderKeyId();
}
public SenderChainKey getSenderChainKey() {
return new SenderChainKey(senderKeyStateStructure.getSenderChainKey().getIteration(),
senderKeyStateStructure.getSenderChainKey().getSeed().toByteArray());
}
public void setSenderChainKey(SenderChainKey chainKey) {
SenderKeyStateStructure.SenderChainKey senderChainKeyStructure =
SenderKeyStateStructure.SenderChainKey.newBuilder()
.setIteration(chainKey.getIteration())
.setSeed(ByteString.copyFrom(chainKey.getSeed()))
.build();
this.senderKeyStateStructure = senderKeyStateStructure.toBuilder()
.setSenderChainKey(senderChainKeyStructure)
.build();
}
public ECPublicKey getSigningKeyPublic() throws InvalidKeyException {
return Curve.decodePoint(senderKeyStateStructure.getSenderSigningKey()
.getPublic()
.toByteArray(), 0);
}
public ECPrivateKey getSigningKeyPrivate() {
return Curve.decodePrivatePoint(senderKeyStateStructure.getSenderSigningKey()
.getPrivate().toByteArray());
}
public boolean hasSenderMessageKey(int iteration) {
for (SenderKeyStateStructure.SenderMessageKey senderMessageKey : senderKeyStateStructure.getSenderMessageKeysList()) {
if (senderMessageKey.getIteration() == iteration) return true;
}
return false;
}
public void addSenderMessageKey(SenderMessageKey senderMessageKey) {
SenderKeyStateStructure.SenderMessageKey senderMessageKeyStructure =
SenderKeyStateStructure.SenderMessageKey.newBuilder()
.setIteration(senderMessageKey.getIteration())
.setSeed(ByteString.copyFrom(senderMessageKey.getSeed()))
.build();
SenderKeyStateStructure.Builder builder = this.senderKeyStateStructure.toBuilder();
builder.addSenderMessageKeys(senderMessageKeyStructure);
if (builder.getSenderMessageKeysCount() > MAX_MESSAGE_KEYS) {
builder.removeSenderMessageKeys(0);
}
this.senderKeyStateStructure = builder.build();
}
public SenderMessageKey removeSenderMessageKey(int iteration) {
List<SenderKeyStateStructure.SenderMessageKey> keys = new LinkedList<SenderKeyStateStructure.SenderMessageKey>(senderKeyStateStructure.getSenderMessageKeysList());
Iterator<SenderKeyStateStructure.SenderMessageKey> iterator = keys.iterator();
SenderKeyStateStructure.SenderMessageKey result = null;
while (iterator.hasNext()) {
SenderKeyStateStructure.SenderMessageKey senderMessageKey = iterator.next();
if (senderMessageKey.getIteration() == iteration) {
result = senderMessageKey;
iterator.remove();
break;
}
}
this.senderKeyStateStructure = this.senderKeyStateStructure.toBuilder()
.clearSenderMessageKeys()
.addAllSenderMessageKeys(keys)
.build();
if (result != null) {
return new SenderMessageKey(result.getIteration(), result.getSeed().toByteArray());
} else {
return null;
}
}
public SenderKeyStateStructure getStructure() {
return senderKeyStateStructure;
}
}

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service/java/src/main/java/org/whispersystems/libsignal/groups/state/SenderKeyStore.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.groups.state;
import org.whispersystems.libsignal.groups.SenderKeyName;
public interface SenderKeyStore {
/**
* Commit to storage the {@link org.whispersystems.libsignal.groups.state.SenderKeyRecord} for a
* given (groupId + senderId + deviceId) tuple.
*
* @param senderKeyName the (groupId + senderId + deviceId) tuple.
* @param record the current SenderKeyRecord for the specified senderKeyName.
*/
public void storeSenderKey(SenderKeyName senderKeyName, SenderKeyRecord record);
/**
* Returns a copy of the {@link org.whispersystems.libsignal.groups.state.SenderKeyRecord}
* corresponding to the (groupId + senderId + deviceId) tuple, or a new SenderKeyRecord if
* one does not currently exist.
* <p>
* It is important that implementations return a copy of the current durable information. The
* returned SenderKeyRecord may be modified, but those changes should not have an effect on the
* durable session state (what is returned by subsequent calls to this method) without the
* store method being called here first.
*
* @param senderKeyName The (groupId + senderId + deviceId) tuple.
* @return a copy of the SenderKeyRecord corresponding to the (groupId + senderId + deviceId tuple, or
* a new SenderKeyRecord if one does not currently exist.
*/
public SenderKeyRecord loadSenderKey(SenderKeyName senderKeyName);
}

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service/java/src/main/java/org/whispersystems/libsignal/kdf/DerivedMessageSecrets.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.kdf;
import org.whispersystems.libsignal.util.ByteUtil;
import java.text.ParseException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public class DerivedMessageSecrets {
public static final int SIZE = 80;
private static final int CIPHER_KEY_LENGTH = 32;
private static final int MAC_KEY_LENGTH = 32;
private static final int IV_LENGTH = 16;
private final SecretKeySpec cipherKey;
private final SecretKeySpec macKey;
private final IvParameterSpec iv;
public DerivedMessageSecrets(byte[] okm) {
try {
byte[][] keys = ByteUtil.split(okm, CIPHER_KEY_LENGTH, MAC_KEY_LENGTH, IV_LENGTH);
this.cipherKey = new SecretKeySpec(keys[0], "AES");
this.macKey = new SecretKeySpec(keys[1], "HmacSHA256");
this.iv = new IvParameterSpec(keys[2]);
} catch (ParseException e) {
throw new AssertionError(e);
}
}
public SecretKeySpec getCipherKey() {
return cipherKey;
}
public SecretKeySpec getMacKey() {
return macKey;
}
public IvParameterSpec getIv() {
return iv;
}
}

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service/java/src/main/java/org/whispersystems/libsignal/kdf/DerivedRootSecrets.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.kdf;
import org.whispersystems.libsignal.util.ByteUtil;
public class DerivedRootSecrets {
public static final int SIZE = 64;
private final byte[] rootKey;
private final byte[] chainKey;
public DerivedRootSecrets(byte[] okm) {
byte[][] keys = ByteUtil.split(okm, 32, 32);
this.rootKey = keys[0];
this.chainKey = keys[1];
}
public byte[] getRootKey() {
return rootKey;
}
public byte[] getChainKey() {
return chainKey;
}
}

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service/java/src/main/java/org/whispersystems/libsignal/kdf/HKDF.java Normal file
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/**
* Copyright (C) 2013-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.kdf;
import java.io.ByteArrayOutputStream;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
public abstract class HKDF {
private static final int HASH_OUTPUT_SIZE = 32;
public static HKDF createFor(int messageVersion) {
switch (messageVersion) {
case 2: return new HKDFv2();
case 3: return new HKDFv3();
default: throw new AssertionError("Unknown version: " + messageVersion);
}
}
public byte[] deriveSecrets(byte[] inputKeyMaterial, byte[] info, int outputLength) {
byte[] salt = new byte[HASH_OUTPUT_SIZE];
return deriveSecrets(inputKeyMaterial, salt, info, outputLength);
}
public byte[] deriveSecrets(byte[] inputKeyMaterial, byte[] salt, byte[] info, int outputLength) {
byte[] prk = extract(salt, inputKeyMaterial);
return expand(prk, info, outputLength);
}
private byte[] extract(byte[] salt, byte[] inputKeyMaterial) {
try {
Mac mac = Mac.getInstance("HmacSHA256");
mac.init(new SecretKeySpec(salt, "HmacSHA256"));
return mac.doFinal(inputKeyMaterial);
} catch (NoSuchAlgorithmException e) {
throw new AssertionError(e);
} catch (InvalidKeyException e) {
throw new AssertionError(e);
}
}
private byte[] expand(byte[] prk, byte[] info, int outputSize) {
try {
int iterations = (int) Math.ceil((double) outputSize / (double) HASH_OUTPUT_SIZE);
byte[] mixin = new byte[0];
ByteArrayOutputStream results = new ByteArrayOutputStream();
int remainingBytes = outputSize;
for (int i= getIterationStartOffset();i<iterations + getIterationStartOffset();i++) {
Mac mac = Mac.getInstance("HmacSHA256");
mac.init(new SecretKeySpec(prk, "HmacSHA256"));
mac.update(mixin);
if (info != null) {
mac.update(info);
}
mac.update((byte)i);
byte[] stepResult = mac.doFinal();
int stepSize = Math.min(remainingBytes, stepResult.length);
results.write(stepResult, 0, stepSize);
mixin = stepResult;
remainingBytes -= stepSize;
}
return results.toByteArray();
} catch (NoSuchAlgorithmException e) {
throw new AssertionError(e);
} catch (InvalidKeyException e) {
throw new AssertionError(e);
}
}
protected abstract int getIterationStartOffset();
}

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service/java/src/main/java/org/whispersystems/libsignal/kdf/HKDFv2.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.kdf;
public class HKDFv2 extends HKDF {
@Override
protected int getIterationStartOffset() {
return 0;
}
}

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service/java/src/main/java/org/whispersystems/libsignal/kdf/HKDFv3.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.kdf;
public class HKDFv3 extends HKDF {
@Override
protected int getIterationStartOffset() {
return 1;
}
}

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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.logging;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.net.UnknownHostException;
public class Log {
private Log() {}
public static void v(String tag, String msg) {
log(SignalProtocolLogger.VERBOSE, tag, msg);
}
public static void v(String tag, String msg, Throwable tr) {
log(SignalProtocolLogger.VERBOSE, tag, msg + '\n' + getStackTraceString(tr));
}
public static void d(String tag, String msg) {
log(SignalProtocolLogger.DEBUG, tag, msg);
}
public static void d(String tag, String msg, Throwable tr) {
log(SignalProtocolLogger.DEBUG, tag, msg + '\n' + getStackTraceString(tr));
}
public static void i(String tag, String msg) {
log(SignalProtocolLogger.INFO, tag, msg);
}
public static void i(String tag, String msg, Throwable tr) {
log(SignalProtocolLogger.INFO, tag, msg + '\n' + getStackTraceString(tr));
}
public static void w(String tag, String msg) {
log(SignalProtocolLogger.WARN, tag, msg);
}
public static void w(String tag, String msg, Throwable tr) {
log(SignalProtocolLogger.WARN, tag, msg + '\n' + getStackTraceString(tr));
}
public static void w(String tag, Throwable tr) {
log(SignalProtocolLogger.WARN, tag, getStackTraceString(tr));
}
public static void e(String tag, String msg) {
log(SignalProtocolLogger.ERROR, tag, msg);
}
public static void e(String tag, String msg, Throwable tr) {
log(SignalProtocolLogger.ERROR, tag, msg + '\n' + getStackTraceString(tr));
}
private static String getStackTraceString(Throwable tr) {
if (tr == null) {
return "";
}
// This is to reduce the amount of log spew that apps do in the non-error
// condition of the network being unavailable.
Throwable t = tr;
while (t != null) {
if (t instanceof UnknownHostException) {
return "";
}
t = t.getCause();
}
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
tr.printStackTrace(pw);
pw.flush();
return sw.toString();
}
private static void log(int priority, String tag, String msg) {
SignalProtocolLogger logger = SignalProtocolLoggerProvider.getProvider();
if (logger != null) {
logger.log(priority, tag, msg);
}
}
}

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service/java/src/main/java/org/whispersystems/libsignal/logging/SignalProtocolLogger.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.logging;
public interface SignalProtocolLogger {
public static final int VERBOSE = 2;
public static final int DEBUG = 3;
public static final int INFO = 4;
public static final int WARN = 5;
public static final int ERROR = 6;
public static final int ASSERT = 7;
public void log(int priority, String tag, String message);
}

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service/java/src/main/java/org/whispersystems/libsignal/logging/SignalProtocolLoggerProvider.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.logging;
public class SignalProtocolLoggerProvider {
private static SignalProtocolLogger provider;
public static SignalProtocolLogger getProvider() {
return provider;
}
public static void setProvider(SignalProtocolLogger provider) {
SignalProtocolLoggerProvider.provider = provider;
}
}

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service/java/src/main/java/org/whispersystems/libsignal/loki/ClosedGroupCiphertextMessage.kt Normal file
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package org.whispersystems.libsignal.loki
import com.google.protobuf.ByteString
import org.whispersystems.libsignal.logging.Log
import org.whispersystems.libsignal.protocol.CiphertextMessage
import org.whispersystems.libsignal.protocol.SignalProtos
class ClosedGroupCiphertextMessage(val ivAndCiphertext: ByteArray, val senderPublicKey: ByteArray, val keyIndex: Int) : CiphertextMessage {
private val serialized: ByteArray
companion object {
fun from(serialized: ByteArray): ClosedGroupCiphertextMessage? {
try {
val proto = SignalProtos.ClosedGroupCiphertextMessage.parseFrom(serialized)
return ClosedGroupCiphertextMessage(proto.ciphertext.toByteArray(), proto.senderPublicKey.toByteArray(), proto.keyIndex)
} catch (exception: Exception) {
Log.d("Loki", "Couldn't parse proto due to error: $exception.")
return null
}
}
}
init {
val builder = SignalProtos.ClosedGroupCiphertextMessage.newBuilder()
builder.ciphertext = ByteString.copyFrom(ivAndCiphertext)
builder.senderPublicKey = ByteString.copyFrom(senderPublicKey)
builder.keyIndex = keyIndex
serialized = builder.build().toByteArray()
}
override fun getType(): Int {
return CiphertextMessage.CLOSED_GROUP_CIPHERTEXT
}
override fun serialize(): ByteArray {
return serialized
}
}

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service/java/src/main/java/org/whispersystems/libsignal/loki/DiffieHellman.kt Normal file
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package org.whispersystems.libsignal.loki
import org.whispersystems.curve25519.Curve25519
import org.whispersystems.signalservice.internal.util.Util
import javax.crypto.Cipher
import javax.crypto.spec.IvParameterSpec
import javax.crypto.spec.SecretKeySpec
object DiffieHellman {
private val cipher = Cipher.getInstance("AES/CBC/PKCS5Padding")
private val curve = Curve25519.getInstance(Curve25519.BEST)
private val ivSize = 16
@JvmStatic @Throws
fun encrypt(plaintext: ByteArray, symmetricKey: ByteArray): ByteArray {
val iv = Util.getSecretBytes(ivSize)
val ivSpec = IvParameterSpec(iv)
val secretKeySpec = SecretKeySpec(symmetricKey, "AES")
cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivSpec)
val ciphertext = cipher.doFinal(plaintext)
return iv + ciphertext
}
@JvmStatic @Throws
fun encrypt(plaintext: ByteArray, publicKey: ByteArray, privateKey: ByteArray): ByteArray {
val symmetricKey = curve.calculateAgreement(publicKey, privateKey)
return encrypt(plaintext, symmetricKey)
}
@JvmStatic @Throws
fun decrypt(ivAndCiphertext: ByteArray, symmetricKey: ByteArray): ByteArray {
val iv = ivAndCiphertext.sliceArray(0 until ivSize)
val ciphertext = ivAndCiphertext.sliceArray(ivSize until ivAndCiphertext.size)
val ivSpec = IvParameterSpec(iv)
val secretKeySpec = SecretKeySpec(symmetricKey, "AES")
cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, ivSpec)
return cipher.doFinal(ciphertext)
}
@JvmStatic @Throws
fun decrypt(ivAndCiphertext: ByteArray, publicKey: ByteArray, privateKey: ByteArray): ByteArray {
val symmetricKey = curve.calculateAgreement(publicKey, privateKey)
return decrypt(ivAndCiphertext, symmetricKey)
}
}

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service/java/src/main/java/org/whispersystems/libsignal/loki/FallbackMessage.kt Normal file
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package org.whispersystems.libsignal.loki
import org.whispersystems.libsignal.protocol.CiphertextMessage
class FallbackMessage(private val paddedMessageBody: ByteArray) : CiphertextMessage {
override fun serialize(): ByteArray {
return paddedMessageBody
}
override fun getType(): Int {
return CiphertextMessage.FALLBACK_MESSAGE_TYPE
}
}

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service/java/src/main/java/org/whispersystems/libsignal/loki/FallbackSessionCipher.kt Normal file
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package org.whispersystems.libsignal.loki
import org.whispersystems.curve25519.Curve25519
import org.whispersystems.libsignal.util.Hex
import org.whispersystems.signalservice.loki.utilities.removing05PrefixIfNeeded
/**
* A session cipher that uses the current user's private key along with a contact's public key to encrypt data.
*/
class FallbackSessionCipher(private val userPrivateKey: ByteArray, private val hexEncodedContactPublicKey: String) {
private val contactPublicKey by lazy {
val hexEncodedContactPublicKey = hexEncodedContactPublicKey.removing05PrefixIfNeeded()
Hex.fromStringCondensed(hexEncodedContactPublicKey)
}
private val symmetricKey: ByteArray?
get() {
try {
val curve = Curve25519.getInstance(Curve25519.BEST)
return curve.calculateAgreement(contactPublicKey, userPrivateKey)
} catch (e: Exception) {
e.printStackTrace()
return null
}
}
companion object {
@JvmStatic val sessionVersion = 3
}
fun encrypt(paddedMessageBody: ByteArray): ByteArray? {
val symmetricKey = symmetricKey ?: return null
try {
return DiffieHellman.encrypt(paddedMessageBody, symmetricKey)
} catch (e: Exception) {
e.printStackTrace()
return null
}
}
fun decrypt(bytes: ByteArray): ByteArray? {
val symmetricKey = symmetricKey ?: return null
try {
return DiffieHellman.decrypt(bytes, symmetricKey)
} catch (e: Exception) {
e.printStackTrace()
return null
}
}
}

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service/java/src/main/java/org/whispersystems/libsignal/loki/LokiSessionCipher.kt Normal file
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package org.whispersystems.libsignal.loki
import org.whispersystems.libsignal.DecryptionCallback
import org.whispersystems.libsignal.SessionCipher
import org.whispersystems.libsignal.SignalProtocolAddress
import org.whispersystems.libsignal.protocol.PreKeySignalMessage
import org.whispersystems.libsignal.protocol.SignalMessage
import org.whispersystems.libsignal.state.SessionState
import org.whispersystems.libsignal.state.SignalProtocolStore
/**
* A wrapper class for `SessionCipher`.
* This applies session reset logic on decryption.
*/
class LokiSessionCipher(private val protocolStore: SignalProtocolStore, private var sessionResetProtocol: SessionResetProtocol, val address: SignalProtocolAddress) : SessionCipher(protocolStore, address) {
override fun decrypt(ciphertext: PreKeySignalMessage?, callback: DecryptionCallback?): ByteArray {
// Record the current session state as it may change during decryption
val activeSession = getCurrentSessionState()
if (activeSession == null && ciphertext != null) {
sessionResetProtocol.validatePreKeySignalMessage(address.name, ciphertext)
}
val plainText = super.decrypt(ciphertext, callback)
handleSessionResetRequestIfNeeded(activeSession)
return plainText
}
override fun decrypt(ciphertext: SignalMessage?, callback: DecryptionCallback?): ByteArray {
// Record the current session state as it may change during decryption
val activeSession = getCurrentSessionState()
val plainText = super.decrypt(ciphertext, callback)
handleSessionResetRequestIfNeeded(activeSession)
return plainText
}
private fun getCurrentSessionState(): SessionState? {
val sessionRecord = protocolStore.loadSession(address)
return sessionRecord.sessionState
}
private fun handleSessionResetRequestIfNeeded(oldSession: SessionState?) {
if (oldSession == null) { return }
val publicKey = address.name
val currentSessionResetStatus = sessionResetProtocol.getSessionResetStatus(publicKey)
if (currentSessionResetStatus == SessionResetStatus.NONE) return
val currentSession = getCurrentSessionState()
if (currentSession == null || currentSession.aliceBaseKey?.contentEquals(oldSession.aliceBaseKey) != true) {
if (currentSessionResetStatus == SessionResetStatus.REQUEST_RECEIVED) {
// The other user used an old session to contact us; wait for them to switch to a new one.
restoreSession(oldSession)
} else {
// Our session reset was successful; we initiated one and got a new session back from the other user.
deleteAllSessionsExcept(currentSession)
sessionResetProtocol.setSessionResetStatus(publicKey, SessionResetStatus.NONE)
sessionResetProtocol.onNewSessionAdopted(publicKey, currentSessionResetStatus)
}
} else if (currentSessionResetStatus == SessionResetStatus.REQUEST_RECEIVED) {
// Our session reset was successful; we received a message with the same session from the other user.
deleteAllSessionsExcept(oldSession)
sessionResetProtocol.setSessionResetStatus(publicKey, SessionResetStatus.NONE)
sessionResetProtocol.onNewSessionAdopted(publicKey, currentSessionResetStatus)
}
}
private fun restoreSession(state: SessionState) {
val session = protocolStore.loadSession(address)
session.previousSessionStates.removeAll { it.aliceBaseKey?.contentEquals(state.aliceBaseKey) ?: false }
session.promoteState(state)
protocolStore.storeSession(address, session)
}
private fun deleteAllSessionsExcept(state: SessionState?) {
val sessionRecord = protocolStore.loadSession(address)
sessionRecord.removePreviousSessionStates()
sessionRecord.setState(state ?: SessionState())
protocolStore.storeSession(address, sessionRecord)
}
}

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service/java/src/main/java/org/whispersystems/libsignal/loki/SessionResetProtocol.kt Normal file
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package org.whispersystems.libsignal.loki
import org.whispersystems.libsignal.protocol.PreKeySignalMessage
interface SessionResetProtocol {
fun getSessionResetStatus(publicKey: String): SessionResetStatus
fun setSessionResetStatus(publicKey: String, sessionResetStatus: SessionResetStatus)
fun validatePreKeySignalMessage(publicKey: String, message: PreKeySignalMessage)
fun onNewSessionAdopted(publicKey: String, oldSessionResetStatus: SessionResetStatus)
}

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service/java/src/main/java/org/whispersystems/libsignal/loki/SessionResetStatus.kt Normal file
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package org.whispersystems.libsignal.loki
enum class SessionResetStatus(val rawValue: Int) {
NONE(0),
IN_PROGRESS(1),
REQUEST_RECEIVED(2)
}

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service/java/src/main/java/org/whispersystems/libsignal/protocol/CiphertextMessage.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
* <p>
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.protocol;
public interface CiphertextMessage {
public static final int CURRENT_VERSION = 3;
public static final int WHISPER_TYPE = 2;
public static final int PREKEY_TYPE = 3;
public static final int SENDERKEY_TYPE = 4;
public static final int SENDERKEY_DISTRIBUTION_TYPE = 5;
public static final int CLOSED_GROUP_CIPHERTEXT = 6;
public static final int FALLBACK_MESSAGE_TYPE = 999; // Loki
// This should be the worst case (worse than V2). So not always accurate, but good enough for padding.
public static final int ENCRYPTED_MESSAGE_OVERHEAD = 53;
public byte[] serialize();
public int getType();
}

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service/java/src/main/java/org/whispersystems/libsignal/protocol/DeviceConsistencyMessage.java Normal file
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package org.whispersystems.libsignal.protocol;
import com.google.protobuf.ByteString;
import com.google.protobuf.InvalidProtocolBufferException;
import org.whispersystems.curve25519.VrfSignatureVerificationFailedException;
import org.whispersystems.libsignal.IdentityKey;
import org.whispersystems.libsignal.IdentityKeyPair;
import org.whispersystems.libsignal.InvalidKeyException;
import org.whispersystems.libsignal.InvalidMessageException;
import org.whispersystems.libsignal.devices.DeviceConsistencyCommitment;
import org.whispersystems.libsignal.devices.DeviceConsistencySignature;
import org.whispersystems.libsignal.ecc.Curve;
public class DeviceConsistencyMessage {
private final DeviceConsistencySignature signature;
private final int generation;
private final byte[] serialized;
public DeviceConsistencyMessage(DeviceConsistencyCommitment commitment, IdentityKeyPair identityKeyPair) {
try {
byte[] signatureBytes = Curve.calculateVrfSignature(identityKeyPair.getPrivateKey(), commitment.toByteArray());
byte[] vrfOutputBytes = Curve.verifyVrfSignature(identityKeyPair.getPublicKey().getPublicKey(), commitment.toByteArray(), signatureBytes);
this.generation = commitment.getGeneration();
this.signature = new DeviceConsistencySignature(signatureBytes, vrfOutputBytes);
this.serialized = SignalProtos.DeviceConsistencyCodeMessage.newBuilder()
.setGeneration(commitment.getGeneration())
.setSignature(ByteString.copyFrom(signature.getSignature()))
.build()
.toByteArray();
} catch (InvalidKeyException e) {
throw new AssertionError(e);
} catch (VrfSignatureVerificationFailedException e) {
throw new AssertionError(e);
}
}
public DeviceConsistencyMessage(DeviceConsistencyCommitment commitment, byte[] serialized, IdentityKey identityKey) throws InvalidMessageException {
try {
SignalProtos.DeviceConsistencyCodeMessage message = SignalProtos.DeviceConsistencyCodeMessage.parseFrom(serialized);
byte[] vrfOutputBytes = Curve.verifyVrfSignature(identityKey.getPublicKey(), commitment.toByteArray(), message.getSignature().toByteArray());
this.generation = message.getGeneration();
this.signature = new DeviceConsistencySignature(message.getSignature().toByteArray(), vrfOutputBytes);
this.serialized = serialized;
} catch (InvalidProtocolBufferException e) {
throw new InvalidMessageException(e);
} catch (InvalidKeyException e) {
throw new InvalidMessageException(e);
} catch (VrfSignatureVerificationFailedException e) {
throw new InvalidMessageException(e);
}
}
public byte[] getSerialized() {
return serialized;
}
public DeviceConsistencySignature getSignature() {
return signature;
}
public int getGeneration() {
return generation;
}
}

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service/java/src/main/java/org/whispersystems/libsignal/protocol/PreKeySignalMessage.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.protocol;
import com.google.protobuf.ByteString;
import com.google.protobuf.InvalidProtocolBufferException;
import org.whispersystems.libsignal.IdentityKey;
import org.whispersystems.libsignal.InvalidKeyException;
import org.whispersystems.libsignal.InvalidMessageException;
import org.whispersystems.libsignal.InvalidVersionException;
import org.whispersystems.libsignal.LegacyMessageException;
import org.whispersystems.libsignal.ecc.Curve;
import org.whispersystems.libsignal.ecc.ECPublicKey;
import org.whispersystems.libsignal.util.ByteUtil;
import org.whispersystems.libsignal.util.guava.Optional;
public class PreKeySignalMessage implements CiphertextMessage {
private final int version;
private final int registrationId;
private final Optional<Integer> preKeyId;
private final int signedPreKeyId;
private final ECPublicKey baseKey;
private final IdentityKey identityKey;
private final SignalMessage message;
private final byte[] serialized;
public PreKeySignalMessage(byte[] serialized)
throws InvalidMessageException, InvalidVersionException
{
try {
this.version = ByteUtil.highBitsToInt(serialized[0]);
if (this.version > CiphertextMessage.CURRENT_VERSION) {
throw new InvalidVersionException("Unknown version: " + this.version);
}
if (this.version < CiphertextMessage.CURRENT_VERSION) {
throw new LegacyMessageException("Legacy version: " + this.version);
}
SignalProtos.PreKeySignalMessage preKeyWhisperMessage
= SignalProtos.PreKeySignalMessage.parseFrom(ByteString.copyFrom(serialized, 1,
serialized.length-1));
if (!preKeyWhisperMessage.hasSignedPreKeyId() ||
!preKeyWhisperMessage.hasBaseKey() ||
!preKeyWhisperMessage.hasIdentityKey() ||
!preKeyWhisperMessage.hasMessage())
{
throw new InvalidMessageException("Incomplete message.");
}
this.serialized = serialized;
this.registrationId = preKeyWhisperMessage.getRegistrationId();
this.preKeyId = preKeyWhisperMessage.hasPreKeyId() ? Optional.of(preKeyWhisperMessage.getPreKeyId()) : Optional.<Integer>absent();
this.signedPreKeyId = preKeyWhisperMessage.hasSignedPreKeyId() ? preKeyWhisperMessage.getSignedPreKeyId() : -1;
this.baseKey = Curve.decodePoint(preKeyWhisperMessage.getBaseKey().toByteArray(), 0);
this.identityKey = new IdentityKey(Curve.decodePoint(preKeyWhisperMessage.getIdentityKey().toByteArray(), 0));
this.message = new SignalMessage(preKeyWhisperMessage.getMessage().toByteArray());
} catch (InvalidProtocolBufferException e) {
throw new InvalidMessageException(e);
} catch (InvalidKeyException e) {
throw new InvalidMessageException(e);
} catch (LegacyMessageException e) {
throw new InvalidMessageException(e);
}
}
public PreKeySignalMessage(int messageVersion, int registrationId, Optional<Integer> preKeyId,
int signedPreKeyId, ECPublicKey baseKey, IdentityKey identityKey,
SignalMessage message)
{
this.version = messageVersion;
this.registrationId = registrationId;
this.preKeyId = preKeyId;
this.signedPreKeyId = signedPreKeyId;
this.baseKey = baseKey;
this.identityKey = identityKey;
this.message = message;
SignalProtos.PreKeySignalMessage.Builder builder =
SignalProtos.PreKeySignalMessage.newBuilder()
.setSignedPreKeyId(signedPreKeyId)
.setBaseKey(ByteString.copyFrom(baseKey.serialize()))
.setIdentityKey(ByteString.copyFrom(identityKey.serialize()))
.setMessage(ByteString.copyFrom(message.serialize()))
.setRegistrationId(registrationId);
if (preKeyId.isPresent()) {
builder.setPreKeyId(preKeyId.get());
}
byte[] versionBytes = {ByteUtil.intsToByteHighAndLow(this.version, CURRENT_VERSION)};
byte[] messageBytes = builder.build().toByteArray();
this.serialized = ByteUtil.combine(versionBytes, messageBytes);
}
public int getMessageVersion() {
return version;
}
public IdentityKey getIdentityKey() {
return identityKey;
}
public int getRegistrationId() {
return registrationId;
}
public Optional<Integer> getPreKeyId() {
return preKeyId;
}
public int getSignedPreKeyId() {
return signedPreKeyId;
}
public ECPublicKey getBaseKey() {
return baseKey;
}
public SignalMessage getWhisperMessage() {
return message;
}
@Override
public byte[] serialize() {
return serialized;
}
@Override
public int getType() {
return CiphertextMessage.PREKEY_TYPE;
}
}

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service/java/src/main/java/org/whispersystems/libsignal/protocol/SenderKeyDistributionMessage.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.protocol;
import com.google.protobuf.ByteString;
import com.google.protobuf.InvalidProtocolBufferException;
import org.whispersystems.libsignal.InvalidKeyException;
import org.whispersystems.libsignal.InvalidMessageException;
import org.whispersystems.libsignal.LegacyMessageException;
import org.whispersystems.libsignal.ecc.Curve;
import org.whispersystems.libsignal.ecc.ECPublicKey;
import org.whispersystems.libsignal.util.ByteUtil;
public class SenderKeyDistributionMessage implements CiphertextMessage {
private final int id;
private final int iteration;
private final byte[] chainKey;
private final ECPublicKey signatureKey;
private final byte[] serialized;
public SenderKeyDistributionMessage(int id, int iteration, byte[] chainKey, ECPublicKey signatureKey) {
byte[] version = {ByteUtil.intsToByteHighAndLow(CURRENT_VERSION, CURRENT_VERSION)};
byte[] protobuf = SignalProtos.SenderKeyDistributionMessage.newBuilder()
.setId(id)
.setIteration(iteration)
.setChainKey(ByteString.copyFrom(chainKey))
.setSigningKey(ByteString.copyFrom(signatureKey.serialize()))
.build().toByteArray();
this.id = id;
this.iteration = iteration;
this.chainKey = chainKey;
this.signatureKey = signatureKey;
this.serialized = ByteUtil.combine(version, protobuf);
}
public SenderKeyDistributionMessage(byte[] serialized) throws LegacyMessageException, InvalidMessageException {
try {
byte[][] messageParts = ByteUtil.split(serialized, 1, serialized.length - 1);
byte version = messageParts[0][0];
byte[] message = messageParts[1];
if (ByteUtil.highBitsToInt(version) < CiphertextMessage.CURRENT_VERSION) {
throw new LegacyMessageException("Legacy message: " + ByteUtil.highBitsToInt(version));
}
if (ByteUtil.highBitsToInt(version) > CURRENT_VERSION) {
throw new InvalidMessageException("Unknown version: " + ByteUtil.highBitsToInt(version));
}
SignalProtos.SenderKeyDistributionMessage distributionMessage = SignalProtos.SenderKeyDistributionMessage.parseFrom(message);
if (!distributionMessage.hasId() ||
!distributionMessage.hasIteration() ||
!distributionMessage.hasChainKey() ||
!distributionMessage.hasSigningKey())
{
throw new InvalidMessageException("Incomplete message.");
}
this.serialized = serialized;
this.id = distributionMessage.getId();
this.iteration = distributionMessage.getIteration();
this.chainKey = distributionMessage.getChainKey().toByteArray();
this.signatureKey = Curve.decodePoint(distributionMessage.getSigningKey().toByteArray(), 0);
} catch (InvalidProtocolBufferException e) {
throw new InvalidMessageException(e);
} catch (InvalidKeyException e) {
throw new InvalidMessageException(e);
}
}
@Override
public byte[] serialize() {
return serialized;
}
@Override
public int getType() {
return SENDERKEY_DISTRIBUTION_TYPE;
}
public int getIteration() {
return iteration;
}
public byte[] getChainKey() {
return chainKey;
}
public ECPublicKey getSignatureKey() {
return signatureKey;
}
public int getId() {
return id;
}
}

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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.protocol;
import com.google.protobuf.ByteString;
import com.google.protobuf.InvalidProtocolBufferException;
import org.whispersystems.libsignal.InvalidKeyException;
import org.whispersystems.libsignal.InvalidMessageException;
import org.whispersystems.libsignal.LegacyMessageException;
import org.whispersystems.libsignal.ecc.Curve;
import org.whispersystems.libsignal.ecc.ECPrivateKey;
import org.whispersystems.libsignal.ecc.ECPublicKey;
import org.whispersystems.libsignal.util.ByteUtil;
import java.text.ParseException;
public class SenderKeyMessage implements CiphertextMessage {
private static final int SIGNATURE_LENGTH = 64;
private final int messageVersion;
private final int keyId;
private final int iteration;
private final byte[] ciphertext;
private final byte[] serialized;
public SenderKeyMessage(byte[] serialized) throws InvalidMessageException, LegacyMessageException {
try {
byte[][] messageParts = ByteUtil.split(serialized, 1, serialized.length - 1 - SIGNATURE_LENGTH, SIGNATURE_LENGTH);
byte version = messageParts[0][0];
byte[] message = messageParts[1];
byte[] signature = messageParts[2];
if (ByteUtil.highBitsToInt(version) < 3) {
throw new LegacyMessageException("Legacy message: " + ByteUtil.highBitsToInt(version));
}
if (ByteUtil.highBitsToInt(version) > CURRENT_VERSION) {
throw new InvalidMessageException("Unknown version: " + ByteUtil.highBitsToInt(version));
}
SignalProtos.SenderKeyMessage senderKeyMessage = SignalProtos.SenderKeyMessage.parseFrom(message);
if (!senderKeyMessage.hasId() ||
!senderKeyMessage.hasIteration() ||
!senderKeyMessage.hasCiphertext())
{
throw new InvalidMessageException("Incomplete message.");
}
this.serialized = serialized;
this.messageVersion = ByteUtil.highBitsToInt(version);
this.keyId = senderKeyMessage.getId();
this.iteration = senderKeyMessage.getIteration();
this.ciphertext = senderKeyMessage.getCiphertext().toByteArray();
} catch (InvalidProtocolBufferException e) {
throw new InvalidMessageException(e);
} catch (ParseException e) {
throw new InvalidMessageException(e);
}
}
public SenderKeyMessage(int keyId, int iteration, byte[] ciphertext, ECPrivateKey signatureKey) {
byte[] version = {ByteUtil.intsToByteHighAndLow(CURRENT_VERSION, CURRENT_VERSION)};
byte[] message = SignalProtos.SenderKeyMessage.newBuilder()
.setId(keyId)
.setIteration(iteration)
.setCiphertext(ByteString.copyFrom(ciphertext))
.build().toByteArray();
byte[] signature = getSignature(signatureKey, ByteUtil.combine(version, message));
this.serialized = ByteUtil.combine(version, message, signature);
this.messageVersion = CURRENT_VERSION;
this.keyId = keyId;
this.iteration = iteration;
this.ciphertext = ciphertext;
}
public int getKeyId() {
return keyId;
}
public int getIteration() {
return iteration;
}
public byte[] getCipherText() {
return ciphertext;
}
public void verifySignature(ECPublicKey signatureKey)
throws InvalidMessageException
{
try {
byte[][] parts = ByteUtil.split(serialized, serialized.length - SIGNATURE_LENGTH, SIGNATURE_LENGTH);
if (!Curve.verifySignature(signatureKey, parts[0], parts[1])) {
throw new InvalidMessageException("Invalid signature!");
}
} catch (InvalidKeyException e) {
throw new InvalidMessageException(e);
}
}
private byte[] getSignature(ECPrivateKey signatureKey, byte[] serialized) {
try {
return Curve.calculateSignature(signatureKey, serialized);
} catch (InvalidKeyException e) {
throw new AssertionError(e);
}
}
@Override
public byte[] serialize() {
return serialized;
}
@Override
public int getType() {
return CiphertextMessage.SENDERKEY_TYPE;
}
}

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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.protocol;
import com.google.protobuf.ByteString;
import com.google.protobuf.InvalidProtocolBufferException;
import org.whispersystems.libsignal.IdentityKey;
import org.whispersystems.libsignal.InvalidKeyException;
import org.whispersystems.libsignal.InvalidMessageException;
import org.whispersystems.libsignal.LegacyMessageException;
import org.whispersystems.libsignal.ecc.Curve;
import org.whispersystems.libsignal.ecc.ECPublicKey;
import org.whispersystems.libsignal.util.ByteUtil;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.text.ParseException;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
public class SignalMessage implements CiphertextMessage {
private static final int MAC_LENGTH = 8;
private final int messageVersion;
private final ECPublicKey senderRatchetKey;
private final int counter;
private final int previousCounter;
private final byte[] ciphertext;
private final byte[] serialized;
public SignalMessage(byte[] serialized) throws InvalidMessageException, LegacyMessageException {
try {
byte[][] messageParts = ByteUtil.split(serialized, 1, serialized.length - 1 - MAC_LENGTH, MAC_LENGTH);
byte version = messageParts[0][0];
byte[] message = messageParts[1];
byte[] mac = messageParts[2];
if (ByteUtil.highBitsToInt(version) < CURRENT_VERSION) {
throw new LegacyMessageException("Legacy message: " + ByteUtil.highBitsToInt(version));
}
if (ByteUtil.highBitsToInt(version) > CURRENT_VERSION) {
throw new InvalidMessageException("Unknown version: " + ByteUtil.highBitsToInt(version));
}
SignalProtos.SignalMessage whisperMessage = SignalProtos.SignalMessage.parseFrom(message);
if (!whisperMessage.hasCiphertext() ||
!whisperMessage.hasCounter() ||
!whisperMessage.hasRatchetKey())
{
throw new InvalidMessageException("Incomplete message.");
}
this.serialized = serialized;
this.senderRatchetKey = Curve.decodePoint(whisperMessage.getRatchetKey().toByteArray(), 0);
this.messageVersion = ByteUtil.highBitsToInt(version);
this.counter = whisperMessage.getCounter();
this.previousCounter = whisperMessage.getPreviousCounter();
this.ciphertext = whisperMessage.getCiphertext().toByteArray();
} catch (InvalidProtocolBufferException e) {
throw new InvalidMessageException(e);
} catch (InvalidKeyException e) {
throw new InvalidMessageException(e);
} catch (ParseException e) {
throw new InvalidMessageException(e);
}
}
public SignalMessage(int messageVersion, SecretKeySpec macKey, ECPublicKey senderRatchetKey,
int counter, int previousCounter, byte[] ciphertext,
IdentityKey senderIdentityKey,
IdentityKey receiverIdentityKey)
{
byte[] version = {ByteUtil.intsToByteHighAndLow(messageVersion, CURRENT_VERSION)};
byte[] message = SignalProtos.SignalMessage.newBuilder()
.setRatchetKey(ByteString.copyFrom(senderRatchetKey.serialize()))
.setCounter(counter)
.setPreviousCounter(previousCounter)
.setCiphertext(ByteString.copyFrom(ciphertext))
.build().toByteArray();
byte[] mac = getMac(senderIdentityKey, receiverIdentityKey, macKey, ByteUtil.combine(version, message));
this.serialized = ByteUtil.combine(version, message, mac);
this.senderRatchetKey = senderRatchetKey;
this.counter = counter;
this.previousCounter = previousCounter;
this.ciphertext = ciphertext;
this.messageVersion = messageVersion;
}
public ECPublicKey getSenderRatchetKey() {
return senderRatchetKey;
}
public int getMessageVersion() {
return messageVersion;
}
public int getCounter() {
return counter;
}
public byte[] getBody() {
return ciphertext;
}
public void verifyMac(IdentityKey senderIdentityKey, IdentityKey receiverIdentityKey, SecretKeySpec macKey)
throws InvalidMessageException
{
byte[][] parts = ByteUtil.split(serialized, serialized.length - MAC_LENGTH, MAC_LENGTH);
byte[] ourMac = getMac(senderIdentityKey, receiverIdentityKey, macKey, parts[0]);
byte[] theirMac = parts[1];
if (!MessageDigest.isEqual(ourMac, theirMac)) {
throw new InvalidMessageException("Bad Mac!");
}
}
private byte[] getMac(IdentityKey senderIdentityKey,
IdentityKey receiverIdentityKey,
SecretKeySpec macKey, byte[] serialized)
{
try {
Mac mac = Mac.getInstance("HmacSHA256");
mac.init(macKey);
mac.update(senderIdentityKey.getPublicKey().serialize());
mac.update(receiverIdentityKey.getPublicKey().serialize());
byte[] fullMac = mac.doFinal(serialized);
return ByteUtil.trim(fullMac, MAC_LENGTH);
} catch (NoSuchAlgorithmException e) {
throw new AssertionError(e);
} catch (java.security.InvalidKeyException e) {
throw new AssertionError(e);
}
}
@Override
public byte[] serialize() {
return serialized;
}
@Override
public int getType() {
return CiphertextMessage.WHISPER_TYPE;
}
public static boolean isLegacy(byte[] message) {
return message != null && message.length >= 1 &&
ByteUtil.highBitsToInt(message[0]) != CiphertextMessage.CURRENT_VERSION;
}
}

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service/java/src/main/java/org/whispersystems/libsignal/protocol/SignalProtos.java Normal file
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114
service/java/src/main/java/org/whispersystems/libsignal/ratchet/AliceSignalProtocolParameters.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.ratchet;
import org.whispersystems.libsignal.IdentityKey;
import org.whispersystems.libsignal.IdentityKeyPair;
import org.whispersystems.libsignal.ecc.ECKeyPair;
import org.whispersystems.libsignal.ecc.ECPublicKey;
import org.whispersystems.libsignal.util.guava.Optional;
public class AliceSignalProtocolParameters {
private final IdentityKeyPair ourIdentityKey;
private final ECKeyPair ourBaseKey;
private final IdentityKey theirIdentityKey;
private final ECPublicKey theirSignedPreKey;
private final Optional<ECPublicKey> theirOneTimePreKey;
private final ECPublicKey theirRatchetKey;
private AliceSignalProtocolParameters(IdentityKeyPair ourIdentityKey, ECKeyPair ourBaseKey,
IdentityKey theirIdentityKey, ECPublicKey theirSignedPreKey,
ECPublicKey theirRatchetKey, Optional<ECPublicKey> theirOneTimePreKey)
{
this.ourIdentityKey = ourIdentityKey;
this.ourBaseKey = ourBaseKey;
this.theirIdentityKey = theirIdentityKey;
this.theirSignedPreKey = theirSignedPreKey;
this.theirRatchetKey = theirRatchetKey;
this.theirOneTimePreKey = theirOneTimePreKey;
if (ourIdentityKey == null || ourBaseKey == null || theirIdentityKey == null ||
theirSignedPreKey == null || theirRatchetKey == null || theirOneTimePreKey == null)
{
throw new IllegalArgumentException("Null values!");
}
}
public IdentityKeyPair getOurIdentityKey() {
return ourIdentityKey;
}
public ECKeyPair getOurBaseKey() {
return ourBaseKey;
}
public IdentityKey getTheirIdentityKey() {
return theirIdentityKey;
}
public ECPublicKey getTheirSignedPreKey() {
return theirSignedPreKey;
}
public Optional<ECPublicKey> getTheirOneTimePreKey() {
return theirOneTimePreKey;
}
public static Builder newBuilder() {
return new Builder();
}
public ECPublicKey getTheirRatchetKey() {
return theirRatchetKey;
}
public static class Builder {
private IdentityKeyPair ourIdentityKey;
private ECKeyPair ourBaseKey;
private IdentityKey theirIdentityKey;
private ECPublicKey theirSignedPreKey;
private ECPublicKey theirRatchetKey;
private Optional<ECPublicKey> theirOneTimePreKey;
public Builder setOurIdentityKey(IdentityKeyPair ourIdentityKey) {
this.ourIdentityKey = ourIdentityKey;
return this;
}
public Builder setOurBaseKey(ECKeyPair ourBaseKey) {
this.ourBaseKey = ourBaseKey;
return this;
}
public Builder setTheirRatchetKey(ECPublicKey theirRatchetKey) {
this.theirRatchetKey = theirRatchetKey;
return this;
}
public Builder setTheirIdentityKey(IdentityKey theirIdentityKey) {
this.theirIdentityKey = theirIdentityKey;
return this;
}
public Builder setTheirSignedPreKey(ECPublicKey theirSignedPreKey) {
this.theirSignedPreKey = theirSignedPreKey;
return this;
}
public Builder setTheirOneTimePreKey(Optional<ECPublicKey> theirOneTimePreKey) {
this.theirOneTimePreKey = theirOneTimePreKey;
return this;
}
public AliceSignalProtocolParameters create() {
return new AliceSignalProtocolParameters(ourIdentityKey, ourBaseKey, theirIdentityKey,
theirSignedPreKey, theirRatchetKey, theirOneTimePreKey);
}
}
}

114
service/java/src/main/java/org/whispersystems/libsignal/ratchet/BobSignalProtocolParameters.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.ratchet;
import org.whispersystems.libsignal.IdentityKey;
import org.whispersystems.libsignal.IdentityKeyPair;
import org.whispersystems.libsignal.ecc.ECKeyPair;
import org.whispersystems.libsignal.ecc.ECPublicKey;
import org.whispersystems.libsignal.util.guava.Optional;
public class BobSignalProtocolParameters {
private final IdentityKeyPair ourIdentityKey;
private final ECKeyPair ourSignedPreKey;
private final Optional<ECKeyPair> ourOneTimePreKey;
private final ECKeyPair ourRatchetKey;
private final IdentityKey theirIdentityKey;
private final ECPublicKey theirBaseKey;
BobSignalProtocolParameters(IdentityKeyPair ourIdentityKey, ECKeyPair ourSignedPreKey,
ECKeyPair ourRatchetKey, Optional<ECKeyPair> ourOneTimePreKey,
IdentityKey theirIdentityKey, ECPublicKey theirBaseKey)
{
this.ourIdentityKey = ourIdentityKey;
this.ourSignedPreKey = ourSignedPreKey;
this.ourRatchetKey = ourRatchetKey;
this.ourOneTimePreKey = ourOneTimePreKey;
this.theirIdentityKey = theirIdentityKey;
this.theirBaseKey = theirBaseKey;
if (ourIdentityKey == null || ourSignedPreKey == null || ourRatchetKey == null ||
ourOneTimePreKey == null || theirIdentityKey == null || theirBaseKey == null)
{
throw new IllegalArgumentException("Null value!");
}
}
public IdentityKeyPair getOurIdentityKey() {
return ourIdentityKey;
}
public ECKeyPair getOurSignedPreKey() {
return ourSignedPreKey;
}
public Optional<ECKeyPair> getOurOneTimePreKey() {
return ourOneTimePreKey;
}
public IdentityKey getTheirIdentityKey() {
return theirIdentityKey;
}
public ECPublicKey getTheirBaseKey() {
return theirBaseKey;
}
public static Builder newBuilder() {
return new Builder();
}
public ECKeyPair getOurRatchetKey() {
return ourRatchetKey;
}
public static class Builder {
private IdentityKeyPair ourIdentityKey;
private ECKeyPair ourSignedPreKey;
private Optional<ECKeyPair> ourOneTimePreKey;
private ECKeyPair ourRatchetKey;
private IdentityKey theirIdentityKey;
private ECPublicKey theirBaseKey;
public Builder setOurIdentityKey(IdentityKeyPair ourIdentityKey) {
this.ourIdentityKey = ourIdentityKey;
return this;
}
public Builder setOurSignedPreKey(ECKeyPair ourSignedPreKey) {
this.ourSignedPreKey = ourSignedPreKey;
return this;
}
public Builder setOurOneTimePreKey(Optional<ECKeyPair> ourOneTimePreKey) {
this.ourOneTimePreKey = ourOneTimePreKey;
return this;
}
public Builder setTheirIdentityKey(IdentityKey theirIdentityKey) {
this.theirIdentityKey = theirIdentityKey;
return this;
}
public Builder setTheirBaseKey(ECPublicKey theirBaseKey) {
this.theirBaseKey = theirBaseKey;
return this;
}
public Builder setOurRatchetKey(ECKeyPair ourRatchetKey) {
this.ourRatchetKey = ourRatchetKey;
return this;
}
public BobSignalProtocolParameters create() {
return new BobSignalProtocolParameters(ourIdentityKey, ourSignedPreKey, ourRatchetKey,
ourOneTimePreKey, theirIdentityKey, theirBaseKey);
}
}
}

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service/java/src/main/java/org/whispersystems/libsignal/ratchet/ChainKey.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.ratchet;
import org.whispersystems.libsignal.kdf.DerivedMessageSecrets;
import org.whispersystems.libsignal.kdf.HKDF;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
public class ChainKey {
private static final byte[] MESSAGE_KEY_SEED = {0x01};
private static final byte[] CHAIN_KEY_SEED = {0x02};
private final HKDF kdf;
private final byte[] key;
private final int index;
public ChainKey(HKDF kdf, byte[] key, int index) {
this.kdf = kdf;
this.key = key;
this.index = index;
}
public byte[] getKey() {
return key;
}
public int getIndex() {
return index;
}
public ChainKey getNextChainKey() {
byte[] nextKey = getBaseMaterial(CHAIN_KEY_SEED);
return new ChainKey(kdf, nextKey, index + 1);
}
public MessageKeys getMessageKeys() {
byte[] inputKeyMaterial = getBaseMaterial(MESSAGE_KEY_SEED);
byte[] keyMaterialBytes = kdf.deriveSecrets(inputKeyMaterial, "WhisperMessageKeys".getBytes(), DerivedMessageSecrets.SIZE);
DerivedMessageSecrets keyMaterial = new DerivedMessageSecrets(keyMaterialBytes);
return new MessageKeys(keyMaterial.getCipherKey(), keyMaterial.getMacKey(), keyMaterial.getIv(), index);
}
private byte[] getBaseMaterial(byte[] seed) {
try {
Mac mac = Mac.getInstance("HmacSHA256");
mac.init(new SecretKeySpec(key, "HmacSHA256"));
return mac.doFinal(seed);
} catch (NoSuchAlgorithmException e) {
throw new AssertionError(e);
} catch (InvalidKeyException e) {
throw new AssertionError(e);
}
}
}

40
service/java/src/main/java/org/whispersystems/libsignal/ratchet/MessageKeys.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.ratchet;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public class MessageKeys {
private final SecretKeySpec cipherKey;
private final SecretKeySpec macKey;
private final IvParameterSpec iv;
private final int counter;
public MessageKeys(SecretKeySpec cipherKey, SecretKeySpec macKey, IvParameterSpec iv, int counter) {
this.cipherKey = cipherKey;
this.macKey = macKey;
this.iv = iv;
this.counter = counter;
}
public SecretKeySpec getCipherKey() {
return cipherKey;
}
public SecretKeySpec getMacKey() {
return macKey;
}
public IvParameterSpec getIv() {
return iv;
}
public int getCounter() {
return counter;
}
}

160
service/java/src/main/java/org/whispersystems/libsignal/ratchet/RatchetingSession.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.ratchet;
import org.whispersystems.libsignal.InvalidKeyException;
import org.whispersystems.libsignal.ecc.Curve;
import org.whispersystems.libsignal.ecc.ECKeyPair;
import org.whispersystems.libsignal.ecc.ECPublicKey;
import org.whispersystems.libsignal.kdf.HKDF;
import org.whispersystems.libsignal.kdf.HKDFv3;
import org.whispersystems.libsignal.protocol.CiphertextMessage;
import org.whispersystems.libsignal.state.SessionState;
import org.whispersystems.libsignal.util.ByteUtil;
import org.whispersystems.libsignal.util.Pair;
import org.whispersystems.libsignal.util.guava.Optional;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Arrays;
public class RatchetingSession {
public static void initializeSession(SessionState sessionState, SymmetricSignalProtocolParameters parameters)
throws InvalidKeyException
{
if (isAlice(parameters.getOurBaseKey().getPublicKey(), parameters.getTheirBaseKey())) {
AliceSignalProtocolParameters.Builder aliceParameters = AliceSignalProtocolParameters.newBuilder();
aliceParameters.setOurBaseKey(parameters.getOurBaseKey())
.setOurIdentityKey(parameters.getOurIdentityKey())
.setTheirRatchetKey(parameters.getTheirRatchetKey())
.setTheirIdentityKey(parameters.getTheirIdentityKey())
.setTheirSignedPreKey(parameters.getTheirBaseKey())
.setTheirOneTimePreKey(Optional.<ECPublicKey>absent());
RatchetingSession.initializeSession(sessionState, aliceParameters.create());
} else {
BobSignalProtocolParameters.Builder bobParameters = BobSignalProtocolParameters.newBuilder();
bobParameters.setOurIdentityKey(parameters.getOurIdentityKey())
.setOurRatchetKey(parameters.getOurRatchetKey())
.setOurSignedPreKey(parameters.getOurBaseKey())
.setOurOneTimePreKey(Optional.<ECKeyPair>absent())
.setTheirBaseKey(parameters.getTheirBaseKey())
.setTheirIdentityKey(parameters.getTheirIdentityKey());
RatchetingSession.initializeSession(sessionState, bobParameters.create());
}
}
public static void initializeSession(SessionState sessionState, AliceSignalProtocolParameters parameters)
throws InvalidKeyException
{
try {
sessionState.setSessionVersion(CiphertextMessage.CURRENT_VERSION);
sessionState.setRemoteIdentityKey(parameters.getTheirIdentityKey());
sessionState.setLocalIdentityKey(parameters.getOurIdentityKey().getPublicKey());
ECKeyPair sendingRatchetKey = Curve.generateKeyPair();
ByteArrayOutputStream secrets = new ByteArrayOutputStream();
secrets.write(getDiscontinuityBytes());
secrets.write(Curve.calculateAgreement(parameters.getTheirSignedPreKey(),
parameters.getOurIdentityKey().getPrivateKey()));
secrets.write(Curve.calculateAgreement(parameters.getTheirIdentityKey().getPublicKey(),
parameters.getOurBaseKey().getPrivateKey()));
secrets.write(Curve.calculateAgreement(parameters.getTheirSignedPreKey(),
parameters.getOurBaseKey().getPrivateKey()));
if (parameters.getTheirOneTimePreKey().isPresent()) {
secrets.write(Curve.calculateAgreement(parameters.getTheirOneTimePreKey().get(),
parameters.getOurBaseKey().getPrivateKey()));
}
DerivedKeys derivedKeys = calculateDerivedKeys(secrets.toByteArray());
Pair<RootKey, ChainKey> sendingChain = derivedKeys.getRootKey().createChain(parameters.getTheirRatchetKey(), sendingRatchetKey);
sessionState.addReceiverChain(parameters.getTheirRatchetKey(), derivedKeys.getChainKey());
sessionState.setSenderChain(sendingRatchetKey, sendingChain.second());
sessionState.setRootKey(sendingChain.first());
} catch (IOException e) {
throw new AssertionError(e);
}
}
public static void initializeSession(SessionState sessionState, BobSignalProtocolParameters parameters)
throws InvalidKeyException
{
try {
sessionState.setSessionVersion(CiphertextMessage.CURRENT_VERSION);
sessionState.setRemoteIdentityKey(parameters.getTheirIdentityKey());
sessionState.setLocalIdentityKey(parameters.getOurIdentityKey().getPublicKey());
ByteArrayOutputStream secrets = new ByteArrayOutputStream();
secrets.write(getDiscontinuityBytes());
secrets.write(Curve.calculateAgreement(parameters.getTheirIdentityKey().getPublicKey(),
parameters.getOurSignedPreKey().getPrivateKey()));
secrets.write(Curve.calculateAgreement(parameters.getTheirBaseKey(),
parameters.getOurIdentityKey().getPrivateKey()));
secrets.write(Curve.calculateAgreement(parameters.getTheirBaseKey(),
parameters.getOurSignedPreKey().getPrivateKey()));
if (parameters.getOurOneTimePreKey().isPresent()) {
secrets.write(Curve.calculateAgreement(parameters.getTheirBaseKey(),
parameters.getOurOneTimePreKey().get().getPrivateKey()));
}
DerivedKeys derivedKeys = calculateDerivedKeys(secrets.toByteArray());
sessionState.setSenderChain(parameters.getOurRatchetKey(), derivedKeys.getChainKey());
sessionState.setRootKey(derivedKeys.getRootKey());
} catch (IOException e) {
throw new AssertionError(e);
}
}
private static byte[] getDiscontinuityBytes() {
byte[] discontinuity = new byte[32];
Arrays.fill(discontinuity, (byte) 0xFF);
return discontinuity;
}
private static DerivedKeys calculateDerivedKeys(byte[] masterSecret) {
HKDF kdf = new HKDFv3();
byte[] derivedSecretBytes = kdf.deriveSecrets(masterSecret, "WhisperText".getBytes(), 64);
byte[][] derivedSecrets = ByteUtil.split(derivedSecretBytes, 32, 32);
return new DerivedKeys(new RootKey(kdf, derivedSecrets[0]),
new ChainKey(kdf, derivedSecrets[1], 0));
}
private static boolean isAlice(ECPublicKey ourKey, ECPublicKey theirKey) {
return ourKey.compareTo(theirKey) < 0;
}
private static class DerivedKeys {
private final RootKey rootKey;
private final ChainKey chainKey;
private DerivedKeys(RootKey rootKey, ChainKey chainKey) {
this.rootKey = rootKey;
this.chainKey = chainKey;
}
public RootKey getRootKey() {
return rootKey;
}
public ChainKey getChainKey() {
return chainKey;
}
}
}

43
service/java/src/main/java/org/whispersystems/libsignal/ratchet/RootKey.java Normal file
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/**
* Copyright (C) 2014-2016 Open Whisper Systems
*
* Licensed according to the LICENSE file in this repository.
*/
package org.whispersystems.libsignal.ratchet;
import org.whispersystems.libsignal.InvalidKeyException;
import org.whispersystems.libsignal.ecc.Curve;
import org.whispersystems.libsignal.ecc.ECKeyPair;
import org.whispersystems.libsignal.ecc.ECPublicKey;
import org.whispersystems.libsignal.kdf.DerivedRootSecrets;
import org.whispersystems.libsignal.kdf.HKDF;
import org.whispersystems.libsignal.util.ByteUtil;
import org.whispersystems.libsignal.util.Pair;
public class RootKey {
private final HKDF kdf;
private final byte[] key;
public RootKey(HKDF kdf, byte[] key) {
this.kdf = kdf;
this.key = key;
}
public byte[] getKeyBytes() {
return key;
}
public Pair<RootKey, ChainKey> createChain(ECPublicKey theirRatchetKey, ECKeyPair ourRatchetKey)
throws InvalidKeyException
{
byte[] sharedSecret = Curve.calculateAgreement(theirRatchetKey, ourRatchetKey.getPrivateKey());
byte[] derivedSecretBytes = kdf.deriveSecrets(sharedSecret, key, "WhisperRatchet".getBytes(), DerivedRootSecrets.SIZE);
DerivedRootSecrets derivedSecrets = new DerivedRootSecrets(derivedSecretBytes);
RootKey newRootKey = new RootKey(kdf, derivedSecrets.getRootKey());
ChainKey newChainKey = new ChainKey(kdf, derivedSecrets.getChainKey(), 0);
return new Pair<RootKey, ChainKey>(newRootKey, newChainKey);
}
}

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