TheArchive/session-android
1
0
Fork 0
mirror of https://github.com/oxen-io/session-android.git synced 2025-02-17 12:48:26 +00:00
Code Issues Packages Projects Releases Wiki Activity

Merge branch 'refactor' of https://github.com/RyanRory/loki-messenger-android into refactor

Browse Source
This commit is contained in:
Brice 2020-12-03 14:36:07 +11:00
commit a53cc9bffb
16 changed files with 197 additions and 261 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
libsession/build.gradle
View File

@ -36,6 +36,7 @@ dependencies {
// Local:
implementation project(":libsignal")
// Remote:
implementation "com.goterl.lazycode:lazysodium-android:4.2.0@aar"
implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlinVersion"
implementation 'androidx.core:core-ktx:1.3.2'
implementation 'androidx.appcompat:appcompat:1.2.0'

6
libsession/src/main/java/org/session/libsession/messaging/messages/Destination.kt
View File

@ -2,9 +2,9 @@ package org.session.libsession.messaging.messages
sealed class Destination {
class Contact(val publicKey: String)
class ClosedGroup(val groupPublicKey: String)
class OpenGroup(val channel: Long, val server: String)
class Contact(val publicKey: String) : Destination()
class ClosedGroup(val groupPublicKey: String) : Destination()
class OpenGroup(val channel: Long, val server: String) : Destination()
companion object {
//TODO need to implement the equivalent to TSThread and then implement from(...)

6
libsession/src/main/java/org/session/libsession/messaging/messages/Message.kt
View File

@ -12,11 +12,7 @@ abstract class Message {
var sender: String? = null
var groupPublicKey: String? = null
var openGroupServerMessageID: Long? = null
companion object {
@JvmStatic
val ttl = 2 * 24 * 60 * 60 * 1000 //TODO not sure about that declaration
}
val ttl: Long = 2 * 24 * 60 * 60 * 1000
// validation
open fun isValid(): Boolean {

4
libsession/src/main/java/org/session/libsession/messaging/messages/visible/Attachment.kt
View File

@ -4,10 +4,8 @@ import android.util.Size
import android.webkit.MimeTypeMap
import org.session.libsignal.service.internal.push.SignalServiceProtos
import java.io.File
import java.net.URL
import kotlin.math.absoluteValue
class Attachment : VisibleMessage<SignalServiceProtos.AttachmentPointer?>() {
class Attachment : VisibleMessageProto<SignalServiceProtos.AttachmentPointer?>() {
var fileName: String? = null
var contentType: String? = null

102
libsession/src/main/java/org/session/libsession/messaging/messages/visible/BaseVisibleMessage.kt
View File

@ -1,102 +0,0 @@
package org.session.libsession.messaging.messages.visible
import org.session.libsignal.libsignal.logging.Log
import org.session.libsignal.service.internal.push.SignalServiceProtos
class BaseVisibleMessage() : VisibleMessage<SignalServiceProtos.Content?>() {
var text: String? = null
var attachmentIDs = ArrayList<String>()
var quote: Quote? = null
var linkPreview: LinkPreview? = null
var contact: Contact? = null
var profile: Profile? = null
companion object {
const val TAG = "BaseVisibleMessage"
fun fromProto(proto: SignalServiceProtos.Content): BaseVisibleMessage? {
val dataMessage = proto.dataMessage ?: return null
val result = BaseVisibleMessage()
result.text = dataMessage.body
// Attachments are handled in MessageReceiver
val quoteProto = dataMessage.quote
quoteProto?.let {
val quote = Quote.fromProto(quoteProto)
quote?.let { result.quote = quote }
}
val linkPreviewProto = dataMessage.previewList.first()
linkPreviewProto?.let {
val linkPreview = LinkPreview.fromProto(linkPreviewProto)
linkPreview?.let { result.linkPreview = linkPreview }
}
// TODO Contact
val profile = Profile.fromProto(dataMessage)
profile?.let { result.profile = profile }
return result
}
}
// validation
override fun isValid(): Boolean {
if (!super.isValid()) return false
if (attachmentIDs.isNotEmpty()) return true
val text = text?.trim() ?: return false
if (text.isNotEmpty()) return true
return false
}
override fun toProto(transaction: String): SignalServiceProtos.Content? {
val proto = SignalServiceProtos.Content.newBuilder()
var attachmentIDs = this.attachmentIDs
val dataMessage: SignalServiceProtos.DataMessage.Builder
// Profile
val profile = profile
val profileProto = profile?.toSSProto()
if (profileProto != null) {
dataMessage = profileProto.toBuilder()
} else {
dataMessage = SignalServiceProtos.DataMessage.newBuilder()
}
// Text
text?.let { dataMessage.body = text }
// Quote
val quotedAttachmentID = quote?.attachmentID
quotedAttachmentID?.let {
val index = attachmentIDs.indexOf(quotedAttachmentID)
if (index >= 0) { attachmentIDs.removeAt(index) }
}
val quote = quote
quote?.let {
val quoteProto = quote.toProto(transaction)
if (quoteProto != null) dataMessage.quote = quoteProto
}
//Link preview
val linkPreviewAttachmentID = linkPreview?.attachmentID
linkPreviewAttachmentID?.let {
val index = attachmentIDs.indexOf(quotedAttachmentID)
if (index >= 0) { attachmentIDs.removeAt(index) }
}
val linkPreview = linkPreview
linkPreview?.let {
val linkPreviewProto = linkPreview.toProto(transaction)
linkPreviewProto?.let {
dataMessage.addAllPreview(listOf(linkPreviewProto))
}
}
//Attachments
// TODO I'm blocking on that one...
//swift: let attachments = attachmentIDs.compactMap { TSAttachmentStream.fetch(uniqueId: $0, transaction: transaction) }
// TODO Contact
// Build
try {
proto.dataMessage = dataMessage.build()
return proto.build()
} catch (e: Exception) {
Log.w(TAG, "Couldn't construct visible message proto from: $this")
return null
}
}
}

2
libsession/src/main/java/org/session/libsession/messaging/messages/visible/Contact.kt
View File

@ -2,7 +2,7 @@ package org.session.libsession.messaging.messages.visible
import org.session.libsignal.service.internal.push.SignalServiceProtos
class Contact : VisibleMessage<SignalServiceProtos.DataMessage.Contact?>() {
class Contact : VisibleMessageProto<SignalServiceProtos.DataMessage.Contact?>() {
companion object {
fun fromProto(proto: SignalServiceProtos.Content): Contact? {

3
libsession/src/main/java/org/session/libsession/messaging/messages/visible/LinkPreview.kt
View File

@ -1,10 +1,9 @@
package org.session.libsession.messaging.messages.visible
import org.session.libsession.messaging.messages.control.TypingIndicator
import org.session.libsignal.libsignal.logging.Log
import org.session.libsignal.service.internal.push.SignalServiceProtos
class LinkPreview() : VisibleMessage<SignalServiceProtos.DataMessage.Preview?>(){
class LinkPreview() : VisibleMessageProto<SignalServiceProtos.DataMessage.Preview?>(){
var title: String? = null
var url: String? = null

2
libsession/src/main/java/org/session/libsession/messaging/messages/visible/Profile.kt
View File

@ -4,7 +4,7 @@ import com.google.protobuf.ByteString
import org.session.libsignal.libsignal.logging.Log
import org.session.libsignal.service.internal.push.SignalServiceProtos
class Profile() : VisibleMessage<SignalServiceProtos.DataMessage?>() {
class Profile() : VisibleMessageProto<SignalServiceProtos.DataMessage?>() {
var displayName: String? = null
var profileKey: ByteArray? = null

2
libsession/src/main/java/org/session/libsession/messaging/messages/visible/Quote.kt
View File

@ -3,7 +3,7 @@ package org.session.libsession.messaging.messages.visible
import org.session.libsignal.libsignal.logging.Log
import org.session.libsignal.service.internal.push.SignalServiceProtos
class Quote() : VisibleMessage<SignalServiceProtos.DataMessage.Quote?>() {
class Quote() : VisibleMessageProto<SignalServiceProtos.DataMessage.Quote?>() {
var timestamp: Long? = 0
var publicKey: String? = null

101
libsession/src/main/java/org/session/libsession/messaging/messages/visible/VisibleMessage.kt
View File

@ -1,15 +1,102 @@
package org.session.libsession.messaging.messages.visible
import org.session.libsession.messaging.messages.Message
import org.session.libsignal.libsignal.logging.Log
import org.session.libsignal.service.internal.push.SignalServiceProtos
abstract class VisibleMessage<out T: com.google.protobuf.MessageOrBuilder?> : Message() {
class VisibleMessage() : VisibleMessageProto<SignalServiceProtos.Content?>() {
abstract fun toProto(transaction: String): T
var text: String? = null
var attachmentIDs = ArrayList<String>()
var quote: Quote? = null
var linkPreview: LinkPreview? = null
var contact: Contact? = null
var profile: Profile? = null
final override fun toProto(): SignalServiceProtos.Content? {
//we don't need to implement this method in subclasses
//TODO it just needs an equivalent to swift: preconditionFailure("Use toProto(using:) if that exists...
TODO("Not implemented")
companion object {
const val TAG = "BaseVisibleMessage"
fun fromProto(proto: SignalServiceProtos.Content): VisibleMessage? {
val dataMessage = proto.dataMessage ?: return null
val result = VisibleMessage()
result.text = dataMessage.body
// Attachments are handled in MessageReceiver
val quoteProto = dataMessage.quote
quoteProto?.let {
val quote = Quote.fromProto(quoteProto)
quote?.let { result.quote = quote }
}
val linkPreviewProto = dataMessage.previewList.first()
linkPreviewProto?.let {
val linkPreview = LinkPreview.fromProto(linkPreviewProto)
linkPreview?.let { result.linkPreview = linkPreview }
}
// TODO Contact
val profile = Profile.fromProto(dataMessage)
profile?.let { result.profile = profile }
return result
}
}
// validation
override fun isValid(): Boolean {
if (!super.isValid()) return false
if (attachmentIDs.isNotEmpty()) return true
val text = text?.trim() ?: return false
if (text.isNotEmpty()) return true
return false
}
override fun toProto(transaction: String): SignalServiceProtos.Content? {
val proto = SignalServiceProtos.Content.newBuilder()
var attachmentIDs = this.attachmentIDs
val dataMessage: SignalServiceProtos.DataMessage.Builder
// Profile
val profile = profile
val profileProto = profile?.toSSProto()
if (profileProto != null) {
dataMessage = profileProto.toBuilder()
} else {
dataMessage = SignalServiceProtos.DataMessage.newBuilder()
}
// Text
text?.let { dataMessage.body = text }
// Quote
val quotedAttachmentID = quote?.attachmentID
quotedAttachmentID?.let {
val index = attachmentIDs.indexOf(quotedAttachmentID)
if (index >= 0) { attachmentIDs.removeAt(index) }
}
val quote = quote
quote?.let {
val quoteProto = quote.toProto(transaction)
if (quoteProto != null) dataMessage.quote = quoteProto
}
//Link preview
val linkPreviewAttachmentID = linkPreview?.attachmentID
linkPreviewAttachmentID?.let {
val index = attachmentIDs.indexOf(quotedAttachmentID)
if (index >= 0) { attachmentIDs.removeAt(index) }
}
val linkPreview = linkPreview
linkPreview?.let {
val linkPreviewProto = linkPreview.toProto(transaction)
linkPreviewProto?.let {
dataMessage.addAllPreview(listOf(linkPreviewProto))
}
}
//Attachments
// TODO I'm blocking on that one...
//swift: let attachments = attachmentIDs.compactMap { TSAttachmentStream.fetch(uniqueId: $0, transaction: transaction) }
// TODO Contact
// Build
try {
proto.dataMessage = dataMessage.build()
return proto.build()
} catch (e: Exception) {
Log.w(TAG, "Couldn't construct visible message proto from: $this")
return null
}
}
}

15
libsession/src/main/java/org/session/libsession/messaging/messages/visible/VisibleMessageProto.kt Normal file
View File

@ -0,0 +1,15 @@
package org.session.libsession.messaging.messages.visible
import org.session.libsession.messaging.messages.Message
import org.session.libsignal.service.internal.push.SignalServiceProtos
abstract class VisibleMessageProto<out T: com.google.protobuf.MessageOrBuilder?> : Message() {
abstract fun toProto(transaction: String): T
final override fun toProto(): SignalServiceProtos.Content? {
//we don't need to implement this method in subclasses
//TODO it just needs an equivalent to swift: preconditionFailure("Use toProto(using:) if that exists...
TODO("Not implemented")
}
}

22
libsession/src/main/java/org/session/libsession/messaging/opengroups/OpenGroupMessage.kt
View File

@ -27,13 +27,13 @@ public data class OpenGroupMessage(
val storage = Configuration.shared.storage
val userPublicKey = storage.getUserPublicKey() ?: return null
// Validation
if (!message.isValid) { return null } // Should be valid at this point
if (!message.isValid()) { return null } // Should be valid at this point
// Quote
val quote: OpenGroupMessage.Quote? = {
val quote: Quote? = {
val quote = message.quote
if (quote != null && quote.isValid) {
if (quote != null && quote.isValid()) {
val quotedMessageServerID = storage.getQuoteServerID(quote.id, quote.publicKey)
OpenGroupMessage.Quote(quote.timestamp, quote.publicKey, quote.text, quotedMessageServerID)
Quote(quote.timestamp!!, quote.publicKey!!, quote.text!!, quotedMessageServerID)
} else {
null
}
@ -45,10 +45,10 @@ public data class OpenGroupMessage(
// Link preview
val linkPreview = message.linkPreview
linkPreview?.let {
if (!linkPreview.isValid) { return@let }
if (!linkPreview.isValid()) { return@let }
val attachment = linkPreview.getImage() ?: return@let
val openGroupLinkPreview = OpenGroupMessage.Attachment(
OpenGroupMessage.Attachment.Kind.LinkPreview,
val openGroupLinkPreview = Attachment(
Attachment.Kind.LinkPreview,
server,
attachment.getId(),
attachment.getContentType(),
@ -59,14 +59,14 @@ public data class OpenGroupMessage(
attachment.getHeight(),
attachment.getCaption(),
attachment.getUrl(),
linkPreview.getUrl(),
linkPreview.getTitle())
linkPreview.url,
linkPreview.title)
result.attachments.add(openGroupLinkPreview)
}
// Attachments
val attachments = message.getAttachemnts().forEach {
val attachement = OpenGroupMessage.Attachment(
OpenGroupMessage.Attachment.Kind.Attachment,
val attachement = Attachment(
Attachment.Kind.Attachment,
server,
it.getId(),
it.getContentType(),

4
libsession/src/main/java/org/session/libsession/messaging/sending_receiving/MessageSender.kt
View File

@ -69,7 +69,7 @@ object MessageSender {
is Destination.OpenGroup -> throw preconditionFailure
}
// Validate the message
message.isValid ?: throw Error.InvalidMessage
if (!message.isValid()) { throw Error.InvalidMessage }
// Convert it to protobuf
val proto = message.toProto() ?: throw Error.ProtoConversionFailed
// Serialize the protobuf
@ -162,7 +162,7 @@ object MessageSender {
}
}
// Validate the message
if (message !is VisibleMessage || !message.isValid) {
if (message !is VisibleMessage || !message.isValid()) {
throw Error.InvalidMessage
}
// Convert the message to an open group message

7
libsession/src/main/java/org/session/libsession/messaging/sending_receiving/MessageSenderEncryption.kt
View File

@ -6,9 +6,11 @@ import org.session.libsession.messaging.messages.Message
import org.session.libsession.messaging.sending_receiving.MessageSender.Error
import org.session.libsession.messaging.utilities.UnidentifiedAccessUtil
import org.session.libsession.utilities.AESGCM
import org.session.libsignal.libsignal.SignalProtocolAddress
import org.session.libsignal.libsignal.loki.ClosedGroupCiphertextMessage
import org.session.libsignal.libsignal.util.Hex
import org.session.libsignal.libsignal.util.guava.Optional
import org.session.libsignal.service.api.crypto.SignalServiceCipher
import org.session.libsignal.service.api.push.SignalServiceAddress
import org.session.libsignal.service.internal.push.SignalServiceProtos
@ -26,8 +28,9 @@ object MessageSenderEncryption {
val certificateValidator = Configuration.shared.certificateValidator
val cipher = SignalServiceCipher(localAddress, storage, sskDatabase, sessionResetImp, certificateValidator)
val signalProtocolAddress = SignalProtocolAddress(recipientPublicKey, 1)
val unidentifiedAccess = UnidentifiedAccessUtil.getAccessFor(context, recipient)
val encryptedMessage = cipher.encrypt(signalProtocolAddress, unidentifiedAccess,plaintext)
val unidentifiedAccessPair = UnidentifiedAccessUtil.getAccessFor(recipientPublicKey)
val unidentifiedAccess = if (unidentifiedAccessPair != null) unidentifiedAccessPair.targetUnidentifiedAccess else Optional.absent()
val encryptedMessage = cipher.encrypt(signalProtocolAddress, unidentifiedAccess, plaintext)
return Base64.decode(encryptedMessage.content)
}

121
libsession/src/main/java/org/session/libsession/messaging/utilities/UnidentifiedAccessUtil.java
View File

@ -1,121 +0,0 @@
package org.session.libsession.messaging.utilities;
import android.content.Context;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.WorkerThread;
import org.session.libsignal.libsignal.util.guava.Optional;
import org.session.libsignal.metadata.SignalProtos;
import org.session.libsignal.metadata.certificate.CertificateValidator;
import org.session.libsignal.metadata.certificate.InvalidCertificateException;
import org.session.libsignal.service.api.crypto.UnidentifiedAccess;
import org.session.libsignal.service.api.crypto.UnidentifiedAccessPair;
import org.session.libsignal.service.api.push.SignalServiceAddress;
import org.thoughtcrime.securesms.logging.Log;
import org.thoughtcrime.securesms.recipients.Recipient;
import org.thoughtcrime.securesms.util.TextSecurePreferences;
import org.thoughtcrime.securesms.util.Util;
public class UnidentifiedAccessUtil {
private static final String TAG = UnidentifiedAccessUtil.class.getSimpleName();
public static CertificateValidator getCertificateValidator() {
return new CertificateValidator();
}
@WorkerThread
public static Optional<UnidentifiedAccessPair> getAccessFor(@NonNull Context context,
@NonNull Recipient recipient)
{
if (!TextSecurePreferences.isUnidentifiedDeliveryEnabled(context)) {
Log.i(TAG, "Unidentified delivery is disabled. [other]");
return Optional.absent();
}
try {
byte[] theirUnidentifiedAccessKey = getTargetUnidentifiedAccessKey(recipient);
byte[] ourUnidentifiedAccessKey = getSelfUnidentifiedAccessKey(context);
byte[] ourUnidentifiedAccessCertificate = getUnidentifiedAccessCertificate(context);
if (TextSecurePreferences.isUniversalUnidentifiedAccess(context)) {
ourUnidentifiedAccessKey = Util.getSecretBytes(16);
}
Log.i(TAG, "Their access key present? " + (theirUnidentifiedAccessKey != null) +
" | Our access key present? " + (ourUnidentifiedAccessKey != null) +
" | Our certificate present? " + (ourUnidentifiedAccessCertificate != null));
if (theirUnidentifiedAccessKey != null &&
ourUnidentifiedAccessKey != null &&
ourUnidentifiedAccessCertificate != null)
{
return Optional.of(new UnidentifiedAccessPair(new UnidentifiedAccess(theirUnidentifiedAccessKey,
ourUnidentifiedAccessCertificate),
new UnidentifiedAccess(ourUnidentifiedAccessKey,
ourUnidentifiedAccessCertificate)));
}
return Optional.absent();
} catch (InvalidCertificateException e) {
Log.w(TAG, e);
return Optional.absent();
}
}
public static Optional<UnidentifiedAccessPair> getAccessForSync(@NonNull Context context) {
if (!TextSecurePreferences.isUnidentifiedDeliveryEnabled(context)) {
Log.i(TAG, "Unidentified delivery is disabled. [self]");
return Optional.absent();
}
try {
byte[] ourUnidentifiedAccessKey = getSelfUnidentifiedAccessKey(context);
byte[] ourUnidentifiedAccessCertificate = getUnidentifiedAccessCertificate(context);
if (TextSecurePreferences.isUniversalUnidentifiedAccess(context)) {
ourUnidentifiedAccessKey = Util.getSecretBytes(16);
}
if (ourUnidentifiedAccessKey != null && ourUnidentifiedAccessCertificate != null) {
return Optional.of(new UnidentifiedAccessPair(new UnidentifiedAccess(ourUnidentifiedAccessKey,
ourUnidentifiedAccessCertificate),
new UnidentifiedAccess(ourUnidentifiedAccessKey,
ourUnidentifiedAccessCertificate)));
}
return Optional.absent();
} catch (InvalidCertificateException e) {
Log.w(TAG, e);
return Optional.absent();
}
}
public static @NonNull byte[] getSelfUnidentifiedAccessKey(@NonNull Context context) {
return UnidentifiedAccess.deriveAccessKeyFrom(ProfileKeyUtil.getProfileKey(context));
}
private static @Nullable byte[] getTargetUnidentifiedAccessKey(@NonNull Recipient recipient) {
byte[] theirProfileKey = recipient.resolve().getProfileKey();
if (theirProfileKey == null) return Util.getSecretBytes(16);
else return UnidentifiedAccess.deriveAccessKeyFrom(theirProfileKey);
}
private static @Nullable byte[] getUnidentifiedAccessCertificate(Context context) {
String ourNumber = TextSecurePreferences.getLocalNumber(context);
if (ourNumber != null) {
SignalProtos.SenderCertificate certificate = SignalProtos.SenderCertificate.newBuilder()
.setSender(ourNumber)
.setSenderDevice(SignalServiceAddress.DEFAULT_DEVICE_ID)
.build();
return certificate.toByteArray();
}
return null;
}
}

60
libsession/src/main/java/org/session/libsession/messaging/utilities/UnidentifiedAccessUtil.kt Normal file
View File

@ -0,0 +1,60 @@
package org.session.libsession.messaging.utilities
import com.goterl.lazycode.lazysodium.LazySodiumAndroid
import com.goterl.lazycode.lazysodium.SodiumAndroid
import org.session.libsession.messaging.Configuration
import org.session.libsignal.libsignal.logging.Log
import org.session.libsignal.metadata.SignalProtos
import org.session.libsignal.metadata.certificate.InvalidCertificateException
import org.session.libsignal.service.api.crypto.UnidentifiedAccess
import org.session.libsignal.service.api.crypto.UnidentifiedAccessPair
object UnidentifiedAccessUtil {
private val TAG = UnidentifiedAccessUtil::class.simpleName
private val sodium = LazySodiumAndroid(SodiumAndroid())
fun getAccessFor(recipientPublicKey: String): UnidentifiedAccessPair? {
try {
val theirUnidentifiedAccessKey = getTargetUnidentifiedAccessKey(recipientPublicKey)
val ourUnidentifiedAccessKey = getSelfUnidentifiedAccessKey()
val ourUnidentifiedAccessCertificate = getUnidentifiedAccessCertificate()
Log.i(TAG, "Their access key present? " + (theirUnidentifiedAccessKey != null) +
" | Our access key present? " + (ourUnidentifiedAccessKey != null) +
" | Our certificate present? " + (ourUnidentifiedAccessCertificate != null))
if (theirUnidentifiedAccessKey != null && ourUnidentifiedAccessKey != null && ourUnidentifiedAccessCertificate != null) {
return UnidentifiedAccessPair(UnidentifiedAccess(theirUnidentifiedAccessKey, ourUnidentifiedAccessCertificate),
UnidentifiedAccess(ourUnidentifiedAccessKey, ourUnidentifiedAccessCertificate))
}
return null
} catch (e: InvalidCertificateException) {
Log.w(TAG, e)
return null
}
}
private fun getTargetUnidentifiedAccessKey(recipientPublicKey: String): ByteArray? {
val theirProfileKey = Configuration.shared.storage.getProfileKeyForRecipient(recipientPublicKey) ?: return sodium.randomBytesBuf(16)
return UnidentifiedAccess.deriveAccessKeyFrom(theirProfileKey)
}
private fun getSelfUnidentifiedAccessKey(): ByteArray? {
val userPublicKey = Configuration.shared.storage.getUserPublicKey()
if (userPublicKey != null) {
return sodium.randomBytesBuf(16)
}
return null
}
private fun getUnidentifiedAccessCertificate(): ByteArray? {
val userPublicKey = Configuration.shared.storage.getUserPublicKey()
if (userPublicKey != null) {
val certificate = SignalProtos.SenderCertificate.newBuilder().setSender(userPublicKey).setSenderDevice(1).build()
return certificate.toByteArray()
}
return null
}
}