public void testChainKeyDerivationV2()
{
byte[] seed =
{
0x8a, 0xb7, 0x2d, 0x6f, 0x4c,
0xc5, 0xac, 0x0d, 0x38, 0x7e,
0xaf, 0x46, 0x33, 0x78, 0xdd,
0xb2, 0x8e, 0xdd, 0x07, 0x38,
0x5b, 0x1c, 0xb0, 0x12, 0x50,
0xc7, 0x15, 0x98, 0x2e, 0x7a,
0xd4, 0x8f
};
byte[] messageKey =
{
0x02, 0xa9, 0xaa, 0x6c, 0x7d,
0xbd, 0x64, 0xf9, 0xd3, 0xaa,
0x92, 0xf9, 0x2a, 0x27, 0x7b,
0xf5, 0x46, 0x09, 0xda, 0xdf,
0x0b, 0x00, 0x82, 0x8a, 0xcf,
0xc6, 0x1e, 0x3c, 0x72, 0x4b,
0x84, 0xa7
};
byte[] macKey =
{
0xbf, 0xbe, 0x5e, 0xfb, 0x60,
0x30, 0x30, 0x52, 0x67, 0x42,
0xe3, 0xee, 0x89, 0xc7, 0x02,
0x4e, 0x88, 0x4e, 0x44, 0x0f,
0x1f, 0xf3, 0x76, 0xbb, 0x23,
0x17, 0xb2, 0xd6, 0x4d, 0xeb,
0x7c, 0x83
};
byte[] nextChainKey =
{
0x28, 0xe8, 0xf8, 0xfe, 0xe5,
0x4b, 0x80, 0x1e, 0xef, 0x7c,
0x5c, 0xfb, 0x2f, 0x17, 0xf3,
0x2c, 0x7b, 0x33, 0x44, 0x85,
0xbb, 0xb7, 0x0f, 0xac, 0x6e,
0xc1, 0x03, 0x42, 0xa2, 0x46,
0xd1, 0x5d
};
ChainKey chainKey = new ChainKey(HKDF.createFor(2), seed, 0);
Assert.AreEqual(seed, chainKey.getKey());
CollectionAssert.AreEqual(messageKey, chainKey.getMessageKeys().getCipherKey());
CollectionAssert.AreEqual(macKey, chainKey.getMessageKeys().getMacKey());
CollectionAssert.AreEqual(nextChainKey, chainKey.getNextChainKey().getKey());
Assert.AreEqual((uint)0, chainKey.getIndex());
Assert.AreEqual((uint)0, chainKey.getMessageKeys().getCounter());
Assert.AreEqual((uint)1, chainKey.getNextChainKey().getIndex());
Assert.AreEqual((uint)1, chainKey.getNextChainKey().getMessageKeys().getCounter());
}
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);
}
public void testChainKeyDerivationV3()
{
byte[] seed = {
(byte) 0x8a, (byte) 0xb7, (byte) 0x2d, (byte) 0x6f, (byte) 0x4c,
(byte) 0xc5, (byte) 0xac, (byte) 0x0d, (byte) 0x38, (byte) 0x7e,
(byte) 0xaf, (byte) 0x46, (byte) 0x33, (byte) 0x78, (byte) 0xdd,
(byte) 0xb2, (byte) 0x8e, (byte) 0xdd, (byte) 0x07, (byte) 0x38,
(byte) 0x5b, (byte) 0x1c, (byte) 0xb0, (byte) 0x12, (byte) 0x50,
(byte) 0xc7, (byte) 0x15, (byte) 0x98, (byte) 0x2e, (byte) 0x7a,
(byte) 0xd4, (byte) 0x8f};
byte[] messageKey = {
/* (byte) 0x02*/
(byte) 0xbf, (byte) 0x51, (byte) 0xe9, (byte) 0xd7,
(byte) 0x5e, (byte) 0x0e, (byte) 0x31, (byte) 0x03, (byte) 0x10,
(byte) 0x51, (byte) 0xf8, (byte) 0x2a, (byte) 0x24, (byte) 0x91,
(byte) 0xff, (byte) 0xc0, (byte) 0x84, (byte) 0xfa, (byte) 0x29,
(byte) 0x8b, (byte) 0x77, (byte) 0x93, (byte) 0xbd, (byte) 0x9d,
(byte) 0xb6, (byte) 0x20, (byte) 0x05, (byte) 0x6f, (byte) 0xeb,
(byte) 0xf4, (byte) 0x52, (byte) 0x17};
byte[] macKey = {
(byte)0xc6, (byte)0xc7, (byte)0x7d, (byte)0x6a, (byte)0x73,
(byte)0xa3, (byte)0x54, (byte)0x33, (byte)0x7a, (byte)0x56,
(byte)0x43, (byte)0x5e, (byte)0x34, (byte)0x60, (byte)0x7d,
(byte)0xfe, (byte)0x48, (byte)0xe3, (byte)0xac, (byte)0xe1,
(byte)0x4e, (byte)0x77, (byte)0x31, (byte)0x4d, (byte)0xc6,
(byte)0xab, (byte)0xc1, (byte)0x72, (byte)0xe7, (byte)0xa7,
(byte)0x03, (byte)0x0b};
byte[] nextChainKey = {
(byte) 0x28, (byte) 0xe8, (byte) 0xf8, (byte) 0xfe, (byte) 0xe5,
(byte) 0x4b, (byte) 0x80, (byte) 0x1e, (byte) 0xef, (byte) 0x7c,
(byte) 0x5c, (byte) 0xfb, (byte) 0x2f, (byte) 0x17, (byte) 0xf3,
(byte) 0x2c, (byte) 0x7b, (byte) 0x33, (byte) 0x44, (byte) 0x85,
(byte) 0xbb, (byte) 0xb7, (byte) 0x0f, (byte) 0xac, (byte) 0x6e,
(byte) 0xc1, (byte) 0x03, (byte) 0x42, (byte) 0xa2, (byte) 0x46,
(byte) 0xd1, (byte) 0x5d};
ChainKey chainKey = new ChainKey(HKDF.createFor(3), seed, 0);
Assert.IsTrue(StructuralComparisons.StructuralEqualityComparer.Equals(chainKey.getKey(), seed));
Assert.IsTrue(StructuralComparisons.StructuralEqualityComparer.Equals(chainKey.getMessageKeys().getCipherKey(), messageKey));
Assert.IsTrue(StructuralComparisons.StructuralEqualityComparer.Equals(chainKey.getMessageKeys().getMacKey(), macKey));
Assert.IsTrue(StructuralComparisons.StructuralEqualityComparer.Equals(chainKey.getNextChainKey().getKey(), nextChainKey));
Assert.IsTrue(chainKey.getIndex() == 0);
Assert.IsTrue(chainKey.getMessageKeys().getCounter() == 0);
Assert.IsTrue(chainKey.getNextChainKey().getIndex() == 1);
Assert.IsTrue(chainKey.getNextChainKey().getMessageKeys().getCounter() == 1);
}
private MessageKeys getOrCreateMessageKeys(SessionState sessionState,
ECPublicKey theirEphemeral,
ChainKey chainKey, uint counter)
{
if (chainKey.getIndex() > counter)
{
if (sessionState.hasMessageKeys(theirEphemeral, counter))
{
return sessionState.removeMessageKeys(theirEphemeral, counter);
}
else
{
throw new DuplicateMessageException($"Received message with old counter: {chainKey.getIndex()} , {counter}");
}
}
//Avoiding a uint overflow
uint chainKeyIndex = chainKey.getIndex();
if ((counter > chainKeyIndex) && (counter - chainKeyIndex > 2000))
{
throw new InvalidMessageException("Over 2000 messages into the future!");
}
while (chainKey.getIndex() < counter)
{
MessageKeys messageKeys = chainKey.getMessageKeys();
sessionState.setMessageKeys(theirEphemeral, messageKeys);
chainKey = chainKey.getNextChainKey();
}
sessionState.setReceiverChainKey(theirEphemeral, chainKey.getNextChainKey());
return chainKey.getMessageKeys();
}
internal DerivedKeys(RootKey rootKey, ChainKey chainKey)
{
this.rootKey = rootKey;
this.chainKey = chainKey;
}
public void setReceiverChainKey(ECPublicKey senderEphemeral, ChainKey chainKey)
{
Pair<Chain, uint> chainAndIndex = getReceiverChain(senderEphemeral);
Chain chain = chainAndIndex.first();
Chain.Types.ChainKey chainKeyStructure = Chain.Types.ChainKey.CreateBuilder()
.SetKey(ByteString.CopyFrom(chainKey.getKey()))
.SetIndex(chainKey.getIndex())
.Build();
Chain updatedChain = chain.ToBuilder().SetChainKey(chainKeyStructure).Build();
this.sessionStructure = this.sessionStructure.ToBuilder()
.SetReceiverChains((int)chainAndIndex.second(), updatedChain) // TODO: conv
.Build();
}
public void setSenderChainKey(ChainKey nextChainKey)
{
Chain.Types.ChainKey chainKey = Chain.Types.ChainKey.CreateBuilder()
.SetKey(ByteString.CopyFrom(nextChainKey.getKey()))
.SetIndex(nextChainKey.getIndex())
.Build();
Chain chain = sessionStructure.SenderChain.ToBuilder()
.SetChainKey(chainKey).Build();
this.sessionStructure = this.sessionStructure.ToBuilder().SetSenderChain(chain).Build();
}
public void setSenderChain(ECKeyPair senderRatchetKeyPair, ChainKey chainKey)
{
Chain.Types.ChainKey chainKeyStructure = Chain.Types.ChainKey.CreateBuilder()
.SetKey(ByteString.CopyFrom(chainKey.getKey()))
.SetIndex(chainKey.getIndex())
.Build();
Chain senderChain = Chain.CreateBuilder()
.SetSenderRatchetKey(ByteString.CopyFrom(senderRatchetKeyPair.getPublicKey().serialize()))
.SetSenderRatchetKeyPrivate(ByteString.CopyFrom(senderRatchetKeyPair.getPrivateKey().serialize()))
.SetChainKey(chainKeyStructure)
.Build();
this.sessionStructure = this.sessionStructure.ToBuilder().SetSenderChain(senderChain).Build();
}
public void addReceiverChain(ECPublicKey senderRatchetKey, ChainKey chainKey)
{
Chain.Types.ChainKey chainKeyStructure = Chain.Types.ChainKey.CreateBuilder()
.SetKey(ByteString.CopyFrom(chainKey.getKey()))
.SetIndex(chainKey.getIndex())
.Build();
Chain chain = Chain.CreateBuilder()
.SetChainKey(chainKeyStructure)
.SetSenderRatchetKey(ByteString.CopyFrom(senderRatchetKey.serialize()))
.Build();
this.sessionStructure = this.sessionStructure.ToBuilder().AddReceiverChains(chain).Build();
if (this.sessionStructure.ReceiverChainsList.Count > 5)
{
this.sessionStructure = this.sessionStructure.ToBuilder()/*.ClearReceiverChains()*/.Build(); //RemoveReceiverChains(0) TODO: why does it work without
}
}
internal DerivedKeys(RootKey rootKey, ChainKey chainKey)
{
this.rootKey = rootKey;
this.chainKey = chainKey;
}
public void testChainKeyDerivationV3()
{
byte[] seed =
{
0x8a, 0xb7, 0x2d, 0x6f, 0x4c,
0xc5, 0xac, 0x0d, 0x38, 0x7e,
0xaf, 0x46, 0x33, 0x78, 0xdd,
0xb2, 0x8e, 0xdd, 0x07, 0x38,
0x5b, 0x1c, 0xb0, 0x12, 0x50,
0xc7, 0x15, 0x98, 0x2e, 0x7a,
0xd4, 0x8f
};
byte[] messageKey =
{
/* 0x02*/
0xbf, 0x51, 0xe9, 0xd7,
0x5e, 0x0e, 0x31, 0x03, 0x10,
0x51, 0xf8, 0x2a, 0x24, 0x91,
0xff, 0xc0, 0x84, 0xfa, 0x29,
0x8b, 0x77, 0x93, 0xbd, 0x9d,
0xb6, 0x20, 0x05, 0x6f, 0xeb,
0xf4, 0x52, 0x17
};
byte[] macKey =
{
0xc6, 0xc7, 0x7d, 0x6a, 0x73,
0xa3, 0x54, 0x33, 0x7a, 0x56,
0x43, 0x5e, 0x34, 0x60, 0x7d,
0xfe, 0x48, 0xe3, 0xac, 0xe1,
0x4e, 0x77, 0x31, 0x4d, 0xc6,
0xab, 0xc1, 0x72, 0xe7, 0xa7,
0x03, 0x0b
};
byte[] nextChainKey =
{
0x28, 0xe8, 0xf8, 0xfe, 0xe5,
0x4b, 0x80, 0x1e, 0xef, 0x7c,
0x5c, 0xfb, 0x2f, 0x17, 0xf3,
0x2c, 0x7b, 0x33, 0x44, 0x85,
0xbb, 0xb7, 0x0f, 0xac, 0x6e,
0xc1, 0x03, 0x42, 0xa2, 0x46,
0xd1, 0x5d
};
ChainKey chainKey = new ChainKey(HKDF.createFor(3), seed, 0);
Assert.AreEqual(seed, chainKey.getKey());
CollectionAssert.AreEqual(messageKey, chainKey.getMessageKeys().getCipherKey());
CollectionAssert.AreEqual(macKey, chainKey.getMessageKeys().getMacKey());
CollectionAssert.AreEqual(nextChainKey, chainKey.getNextChainKey().getKey());
Assert.AreEqual((uint)0, chainKey.getIndex());
Assert.AreEqual((uint)0, chainKey.getMessageKeys().getCounter());
Assert.AreEqual((uint)1, chainKey.getNextChainKey().getIndex());
Assert.AreEqual((uint)1, chainKey.getNextChainKey().getMessageKeys().getCounter());
}