public Pair <RootKey, ChainKey> createChain(ECPublicKey theirRatchetKey, ECKeyPair ourRatchetKey)
{
byte[] sharedSecret = Curve.calculateAgreement(theirRatchetKey, ourRatchetKey.getPrivateKey());
byte[] derivedSecretBytes = kdf.deriveSecrets(sharedSecret, key, Encoding.UTF8.GetBytes("WhisperRatchet"), 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));
}
public Pair<RootKey, ChainKey> createChain(ECPublicKey theirRatchetKey, ECKeyPair ourRatchetKey)
{
byte[] sharedSecret = Curve.calculateAgreement(theirRatchetKey, ourRatchetKey.getPrivateKey());
byte[] derivedSecretBytes = kdf.deriveSecrets(sharedSecret, key, Encoding.UTF8.GetBytes("WhisperRatchet"), 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);
}
internal DerivedKeys(RootKey rootKey, ChainKey chainKey)
{
this.rootKey = rootKey;
this.chainKey = chainKey;
}
public void testRootKeyDerivationV2()
{
byte[] rootKeySeed =
{
0x7b, 0xa6, 0xde, 0xbc, 0x2b,
0xc1, 0xbb, 0xf9, 0x1a, 0xbb,
0xc1, 0x36, 0x74, 0x04, 0x17,
0x6c, 0xa6, 0x23, 0x09, 0x5b,
0x7e, 0xc6, 0x6b, 0x45, 0xf6,
0x02, 0xd9, 0x35, 0x38, 0x94,
0x2d, 0xcc
};
byte[] alicePublic =
{
0x05, 0xee, 0x4f, 0xa6, 0xcd,
0xc0, 0x30, 0xdf, 0x49, 0xec,
0xd0, 0xba, 0x6c, 0xfc, 0xff,
0xb2, 0x33, 0xd3, 0x65, 0xa2,
0x7f, 0xad, 0xbe, 0xff, 0x77,
0xe9, 0x63, 0xfc, 0xb1, 0x62,
0x22, 0xe1, 0x3a
};
byte[] alicePrivate =
{
0x21, 0x68, 0x22, 0xec, 0x67,
0xeb, 0x38, 0x04, 0x9e, 0xba,
0xe7, 0xb9, 0x39, 0xba, 0xea,
0xeb, 0xb1, 0x51, 0xbb, 0xb3,
0x2d, 0xb8, 0x0f, 0xd3, 0x89,
0x24, 0x5a, 0xc3, 0x7a, 0x94,
0x8e, 0x50
};
byte[] bobPublic =
{
0x05, 0xab, 0xb8, 0xeb, 0x29,
0xcc, 0x80, 0xb4, 0x71, 0x09,
0xa2, 0x26, 0x5a, 0xbe, 0x97,
0x98, 0x48, 0x54, 0x06, 0xe3,
0x2d, 0xa2, 0x68, 0x93, 0x4a,
0x95, 0x55, 0xe8, 0x47, 0x57,
0x70, 0x8a, 0x30
};
byte[] nextRoot =
{
0xb1, 0x14, 0xf5, 0xde, 0x28,
0x01, 0x19, 0x85, 0xe6, 0xeb,
0xa2, 0x5d, 0x50, 0xe7, 0xec,
0x41, 0xa9, 0xb0, 0x2f, 0x56,
0x93, 0xc5, 0xc7, 0x88, 0xa6,
0x3a, 0x06, 0xd2, 0x12, 0xa2,
0xf7, 0x31
};
byte[] nextChain =
{
0x9d, 0x7d, 0x24, 0x69, 0xbc,
0x9a, 0xe5, 0x3e, 0xe9, 0x80,
0x5a, 0xa3, 0x26, 0x4d, 0x24,
0x99, 0xa3, 0xac, 0xe8, 0x0f,
0x4c, 0xca, 0xe2, 0xda, 0x13,
0x43, 0x0c, 0x5c, 0x55, 0xb5,
0xca, 0x5f
};
ECPublicKey alicePublicKey = Curve.decodePoint(alicePublic, 0);
ECPrivateKey alicePrivateKey = Curve.decodePrivatePoint(alicePrivate);
ECKeyPair aliceKeyPair = new ECKeyPair(alicePublicKey, alicePrivateKey);
ECPublicKey bobPublicKey = Curve.decodePoint(bobPublic, 0);
RootKey rootKey = new RootKey(HKDF.createFor(2), rootKeySeed);
Pair<RootKey, ChainKey> rootKeyChainKeyPair = rootKey.createChain(bobPublicKey, aliceKeyPair);
RootKey nextRootKey = rootKeyChainKeyPair.first();
ChainKey nextChainKey = rootKeyChainKeyPair.second();
CollectionAssert.AreEqual(rootKey.getKeyBytes(), rootKeySeed);
CollectionAssert.AreEqual(nextRootKey.getKeyBytes(), nextRoot);
CollectionAssert.AreEqual(nextChainKey.getKey(), nextChain);
}
public void setRootKey(RootKey rootKey)
{
this.sessionStructure = this.sessionStructure.ToBuilder()
.SetRootKey(ByteString.CopyFrom(rootKey.getKeyBytes()))
.Build();
}
internal DerivedKeys(RootKey rootKey, ChainKey chainKey)
{
this.rootKey = rootKey;
this.chainKey = chainKey;
}