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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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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()));