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Curve25519 keys to 1 mod 8 for ephemerals.

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This commit is contained in:
Moxie Marlinspike 2014-03-19 15:25:50 -07:00
parent fd1a18d2d0
commit 5a3daf4846
17 changed files with 34 additions and 32 deletions
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7
library/jni/curve25519-donna-jni.c
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@ -22,11 +22,16 @@
#include "curve25519-donna.h"
JNIEXPORT jbyteArray JNICALL Java_org_whispersystems_textsecure_crypto_ecc_Curve25519_generatePrivateKey
(JNIEnv *env, jclass clazz, jbyteArray random)
(JNIEnv *env, jclass clazz, jbyteArray random, jboolean ephemeral)
{
uint8_t* privateKey = (uint8_t*)(*env)->GetByteArrayElements(env, random, 0);
privateKey[0] &= 248;
if (ephemeral) {
privateKey[0] |= 1;
}
privateKey[31] &= 127;
privateKey[31] |= 64;

3
library/jni/curve25519-donna.c
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@ -720,9 +720,6 @@ curve25519_donna(u8 *mypublic, const u8 *secret, const u8 *basepoint) {
int i;
for (i = 0; i < 32; ++i) e[i] = secret[i];
e[0] &= 248;
e[31] &= 127;
e[31] |= 64;
fexpand(bp, basepoint);
cmult(x, z, e, bp);

BIN
library/libs/armeabi-v7a/libcurve25519.so
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library/libs/armeabi/libcurve25519.so
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library/libs/x86/libcurve25519.so
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4
library/src/org/whispersystems/textsecure/crypto/PreKeyUtil.java
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@ -48,7 +48,7 @@ public class PreKeyUtil {
for (int i=0;i<BATCH_SIZE;i++) {
int preKeyId = (preKeyIdOffset + i) % Medium.MAX_VALUE;
ECKeyPair keyPair = Curve25519.generateKeyPair();
ECKeyPair keyPair = Curve25519.generateKeyPair(true);
PreKeyRecord record = new PreKeyRecord(context, masterSecret, preKeyId, keyPair);
record.save();
@ -69,7 +69,7 @@ public class PreKeyUtil {
}
}
ECKeyPair keyPair = Curve25519.generateKeyPair();
ECKeyPair keyPair = Curve25519.generateKeyPair(true);
PreKeyRecord record = new PreKeyRecord(context, masterSecret, Medium.MAX_VALUE, keyPair);
record.save();

2
library/src/org/whispersystems/textsecure/crypto/SessionCipherV2.java
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@ -152,7 +152,7 @@ public class SessionCipherV2 extends SessionCipher {
RootKey rootKey = sessionState.getRootKey();
ECKeyPair ourEphemeral = sessionState.getSenderEphemeralPair();
Pair<RootKey, ChainKey> receiverChain = rootKey.createChain(theirEphemeral, ourEphemeral);
ECKeyPair ourNewEphemeral = Curve.generateKeyPairForType(Curve.DJB_TYPE);
ECKeyPair ourNewEphemeral = Curve.generateKeyPairForType(Curve.DJB_TYPE, true);
Pair<RootKey, ChainKey> senderChain = receiverChain.first.createChain(theirEphemeral, ourNewEphemeral);
sessionState.setRootKey(senderChain.first);

10
library/src/org/whispersystems/textsecure/crypto/ecc/Curve.java
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@ -25,9 +25,9 @@ public class Curve {
private static final int NIST_TYPE2 = 0x03;
public static final int DJB_TYPE = 0x05;
public static ECKeyPair generateKeyPairForType(int keyType) {
public static ECKeyPair generateKeyPairForType(int keyType, boolean ephemeral) {
if (keyType == DJB_TYPE) {
return Curve25519.generateKeyPair();
return Curve25519.generateKeyPair(ephemeral);
} else if (keyType == NIST_TYPE || keyType == NIST_TYPE2) {
return CurveP256.generateKeyPair();
} else {
@ -35,11 +35,11 @@ public class Curve {
}
}
public static ECKeyPair generateKeyPairForSession(int messageVersion) {
public static ECKeyPair generateKeyPairForSession(int messageVersion, boolean ephemeral) {
if (messageVersion <= CiphertextMessage.LEGACY_VERSION) {
return generateKeyPairForType(NIST_TYPE);
return generateKeyPairForType(NIST_TYPE, ephemeral);
} else {
return generateKeyPairForType(DJB_TYPE);
return generateKeyPairForType(DJB_TYPE, ephemeral);
}
}

10
library/src/org/whispersystems/textsecure/crypto/ecc/Curve25519.java
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@ -37,10 +37,10 @@ public class Curve25519 {
private static native byte[] calculateAgreement(byte[] ourPrivate, byte[] theirPublic);
private static native byte[] generatePublicKey(byte[] privateKey);
private static native byte[] generatePrivateKey(byte[] random);
private static native byte[] generatePrivateKey(byte[] random, boolean ephemeral);
public static ECKeyPair generateKeyPair() {
byte[] privateKey = generatePrivateKey();
public static ECKeyPair generateKeyPair(boolean ephemeral) {
byte[] privateKey = generatePrivateKey(ephemeral);
byte[] publicKey = generatePublicKey(privateKey);
return new ECKeyPair(new DjbECPublicKey(publicKey), new DjbECPrivateKey(privateKey));
@ -65,11 +65,11 @@ public class Curve25519 {
return new DjbECPublicKey(keyBytes);
}
private static byte[] generatePrivateKey() {
private static byte[] generatePrivateKey(boolean ephemeral) {
byte[] privateKey = new byte[32];
random.nextBytes(privateKey);
return generatePrivateKey(privateKey);
return generatePrivateKey(privateKey, ephemeral);
}
}

2
library/src/org/whispersystems/textsecure/crypto/ratchet/RatchetingSession.java
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@ -45,7 +45,7 @@ public class RatchetingSession {
sessionState.setRemoteIdentityKey(theirIdentityKey);
sessionState.setLocalIdentityKey(ourIdentityKey.getPublicKey());
ECKeyPair sendingKey = Curve.generateKeyPairForType(ourIdentityKey.getPublicKey().getPublicKey().getType());
ECKeyPair sendingKey = Curve.generateKeyPairForType(ourIdentityKey.getPublicKey().getPublicKey().getType(), true);
Pair<RootKey, ChainKey> receivingChain = calculate3DHE(true, ourBaseKey, theirBaseKey, ourIdentityKey, theirIdentityKey);
Pair<RootKey, ChainKey> sendingChain = receivingChain.first.createChain(theirEphemeralKey, sendingKey);

2
library/src/org/whispersystems/textsecure/storage/LocalKeyRecord.java
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@ -70,7 +70,7 @@ public class LocalKeyRecord extends Record {
this.localCurrentKeyPair = this.localNextKeyPair;
this.localNextKeyPair = new KeyPair((this.localNextKeyPair.getId()+1) % Medium.MAX_VALUE,
Curve.generateKeyPairForType(keyType),
Curve.generateKeyPairForType(keyType, true),
masterSecret);
}
}

2
src/org/thoughtcrime/securesms/crypto/AsymmetricMasterCipher.java
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@ -93,7 +93,7 @@ public class AsymmetricMasterCipher {
theirPublic = asymmetricMasterSecret.getNistPublicKey();
}
ECKeyPair ourKeyPair = Curve.generateKeyPairForType(theirPublic.getType());
ECKeyPair ourKeyPair = Curve.generateKeyPairForType(theirPublic.getType(), true);
byte[] secret = Curve.calculateAgreement(theirPublic, ourKeyPair.getPrivateKey());
MasterCipher masterCipher = getMasterCipherForSecret(secret);
byte[] encryptedBodyBytes = masterCipher.encryptBytes(body.getBytes());

6
src/org/thoughtcrime/securesms/crypto/IdentityKeyUtil.java
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@ -135,8 +135,8 @@ public class IdentityKeyUtil {
}
public static void generateIdentityKeys(Context context, MasterSecret masterSecret) {
ECKeyPair nistKeyPair = Curve.generateKeyPairForType(Curve.NIST_TYPE);
ECKeyPair djbKeyPair = Curve.generateKeyPairForType(Curve.DJB_TYPE);
ECKeyPair nistKeyPair = Curve.generateKeyPairForType(Curve.NIST_TYPE, false);
ECKeyPair djbKeyPair = Curve.generateKeyPairForType(Curve.DJB_TYPE, false);
MasterCipher masterCipher = new MasterCipher(masterSecret);
IdentityKey nistIdentityKey = new IdentityKey(nistKeyPair.getPublicKey());
@ -160,7 +160,7 @@ public class IdentityKeyUtil {
public static void generateCurve25519IdentityKeys(Context context, MasterSecret masterSecret) {
MasterCipher masterCipher = new MasterCipher(masterSecret);
ECKeyPair djbKeyPair = Curve.generateKeyPairForType(Curve.DJB_TYPE);
ECKeyPair djbKeyPair = Curve.generateKeyPairForType(Curve.DJB_TYPE, false);
IdentityKey djbIdentityKey = new IdentityKey(djbKeyPair.getPublicKey());
byte[] djbPrivateKey = masterCipher.encryptKey(djbKeyPair.getPrivateKey());

4
src/org/thoughtcrime/securesms/crypto/KeyExchangeInitiator.java
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@ -62,8 +62,8 @@ public class KeyExchangeInitiator {
private static void initiateKeyExchange(Context context, MasterSecret masterSecret, Recipient recipient) {
int sequence = getRandomSequence();
int flags = KeyExchangeMessageV2.INITIATE_FLAG;
ECKeyPair baseKey = Curve.generateKeyPairForSession(CiphertextMessage.CURRENT_VERSION);
ECKeyPair ephemeralKey = Curve.generateKeyPairForSession(CiphertextMessage.CURRENT_VERSION);
ECKeyPair baseKey = Curve.generateKeyPairForSession(CiphertextMessage.CURRENT_VERSION, true);
ECKeyPair ephemeralKey = Curve.generateKeyPairForSession(CiphertextMessage.CURRENT_VERSION, true);
IdentityKeyPair identityKey = IdentityKeyUtil.getIdentityKeyPair(context, masterSecret, Curve.DJB_TYPE);
KeyExchangeMessageV2 message = new KeyExchangeMessageV2(sequence, flags,

4
src/org/thoughtcrime/securesms/crypto/KeyExchangeProcessorV1.java
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@ -136,8 +136,8 @@ public class KeyExchangeProcessorV1 extends KeyExchangeProcessor {
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
int initialId = secureRandom.nextInt(4094) + 1;
KeyPair currentPair = new KeyPair(initialId, Curve.generateKeyPairForSession(1), masterSecret);
KeyPair nextPair = new KeyPair(initialId + 1, Curve.generateKeyPairForSession(1), masterSecret);
KeyPair currentPair = new KeyPair(initialId, Curve.generateKeyPairForSession(1, true), masterSecret);
KeyPair nextPair = new KeyPair(initialId + 1, Curve.generateKeyPairForSession(1, true), masterSecret);
LocalKeyRecord record = new LocalKeyRecord(context, masterSecret, recipient);
record.setCurrentKeyPair(currentPair);

8
src/org/thoughtcrime/securesms/crypto/KeyExchangeProcessorV2.java
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@ -131,8 +131,8 @@ public class KeyExchangeProcessorV2 extends KeyExchangeProcessor {
public void processKeyExchangeMessage(PreKeyEntity message, long threadId)
throws InvalidKeyException
{
ECKeyPair ourBaseKey = Curve.generateKeyPairForSession(2);
ECKeyPair ourEphemeralKey = Curve.generateKeyPairForSession(2);
ECKeyPair ourBaseKey = Curve.generateKeyPairForSession(2, true);
ECKeyPair ourEphemeralKey = Curve.generateKeyPairForSession(2, true);
ECPublicKey theirBaseKey = message.getPublicKey();
ECPublicKey theirEphemeralKey = theirBaseKey;
IdentityKey theirIdentityKey = message.getIdentityKey();
@ -184,8 +184,8 @@ public class KeyExchangeProcessorV2 extends KeyExchangeProcessor {
if (!sessionRecord.getSessionState().hasPendingKeyExchange()) {
Log.w("KeyExchangeProcessorV2", "We don't have a pending initiate...");
ourBaseKey = Curve.generateKeyPairForType(message.getBaseKey().getType());
ourEphemeralKey = Curve.generateKeyPairForType(message.getBaseKey().getType());
ourBaseKey = Curve.generateKeyPairForType(message.getBaseKey().getType(), true);
ourEphemeralKey = Curve.generateKeyPairForType(message.getBaseKey().getType(), true);
ourIdentityKey = IdentityKeyUtil.getIdentityKeyPair(context, masterSecret, message.getBaseKey().getType());
sessionRecord.getSessionState().setPendingKeyExchange(message.getSequence(), ourBaseKey,

2
src/org/thoughtcrime/securesms/crypto/MasterSecretUtil.java
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@ -160,7 +160,7 @@ public class MasterSecretUtil {
MasterSecret masterSecret)
{
MasterCipher masterCipher = new MasterCipher(masterSecret);
ECKeyPair keyPair = Curve.generateKeyPairForType(Curve.DJB_TYPE);
ECKeyPair keyPair = Curve.generateKeyPairForType(Curve.DJB_TYPE, true);
save(context, ASYMMETRIC_LOCAL_PUBLIC_DJB, keyPair.getPublicKey().serialize());
save(context, ASYMMETRIC_LOCAL_PRIVATE_DJB, masterCipher.encryptKey(keyPair.getPrivateKey()));