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Add info to MessageKey HKDF, change order of RootKey derivation.

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This commit is contained in:
Moxie Marlinspike 2013-11-26 09:08:52 -08:00
parent 44092a3eff
commit f7b71e5e28
3 changed files with 5 additions and 5 deletions
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2
library/src/org/whispersystems/textsecure/crypto/ratchet/ChainKey.java
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@ -38,7 +38,7 @@ public class ChainKey {
public MessageKeys getMessageKeys() {
HKDF kdf = new HKDF();
byte[] inputKeyMaterial = getBaseMaterial(MESSAGE_KEY_SEED);
DerivedSecrets keyMaterial = kdf.deriveSecrets(inputKeyMaterial, null);
DerivedSecrets keyMaterial = kdf.deriveSecrets(inputKeyMaterial, "WhisperMessageKeys".getBytes());
return new MessageKeys(keyMaterial.getCipherKey(), keyMaterial.getMacKey(), index);
}

4
library/src/org/whispersystems/textsecure/crypto/ratchet/RatchetingSession.java
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@ -71,8 +71,8 @@ public class RatchetingSession {
sessionRecord.setRootKey(sendingChain.first);
}
public static Pair<RootKey, ChainKey> calculate3DHE(ECKeyPair ourEphemeral, ECPublicKey theirEphemeral,
IdentityKeyPair ourIdentity, IdentityKey theirIdentity)
private static Pair<RootKey, ChainKey> calculate3DHE(ECKeyPair ourEphemeral, ECPublicKey theirEphemeral,
IdentityKeyPair ourIdentity, IdentityKey theirIdentity)
throws InvalidKeyException
{
try {

4
library/src/org/whispersystems/textsecure/crypto/ratchet/RootKey.java
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@ -30,8 +30,8 @@ public class RootKey {
HKDF kdf = new HKDF();
byte[] sharedSecret = Curve.calculateAgreement(theirEphemeral, ourEphemeral.getPrivateKey());
DerivedSecrets keys = kdf.deriveSecrets(sharedSecret, key, "WhisperRatchet".getBytes());
RootKey newRootKey = new RootKey(keys.getMacKey().getEncoded());
ChainKey newChainKey = new ChainKey(keys.getCipherKey().getEncoded(), 0);
RootKey newRootKey = new RootKey(keys.getCipherKey().getEncoded());
ChainKey newChainKey = new ChainKey(keys.getMacKey().getEncoded(), 0);
return new Pair<RootKey, ChainKey>(newRootKey, newChainKey);
}