public void SetReceiverChainKey(IEcPublicKey senderEphemeral, ChainKey chainKey)
{
Pair <SessionStructure.Types.Chain, uint> chainAndIndex = GetReceiverChain(senderEphemeral);
SessionStructure.Types.Chain chain = chainAndIndex.First();
SessionStructure.Types.Chain.Types.ChainKey chainKeyStructure = new SessionStructure.Types.Chain.Types.ChainKey
{
Key = ByteString.CopyFrom(chainKey.GetKey()),
Index = chainKey.GetIndex()
};
chain.ChainKey = chainKeyStructure;
_sessionStructure.ReceiverChains[(int)chainAndIndex.Second()] = chain;
}
public void SetSenderChain(EcKeyPair senderRatchetKeyPair, ChainKey chainKey)
{
SessionStructure.Types.Chain.Types.ChainKey chainKeyStructure = new SessionStructure.Types.Chain.Types.ChainKey
{
Key = ByteString.CopyFrom(chainKey.GetKey()),
Index = chainKey.GetIndex()
};
SessionStructure.Types.Chain senderChain = new SessionStructure.Types.Chain
{
SenderRatchetKey = ByteString.CopyFrom(senderRatchetKeyPair.GetPublicKey().Serialize()),
SenderRatchetKeyPrivate = ByteString.CopyFrom(senderRatchetKeyPair.GetPrivateKey().Serialize()),
ChainKey = chainKeyStructure
};
_sessionStructure.SenderChain = senderChain;
}
public ChainKey GetReceiverChainKey(IEcPublicKey senderEphemeral)
{
Pair <SessionStructure.Types.Chain, uint> receiverChainAndIndex = GetReceiverChain(senderEphemeral);
SessionStructure.Types.Chain receiverChain = receiverChainAndIndex.First();
if (receiverChain == null)
{
return(null);
}
else
{
return(new ChainKey(Hkdf.CreateFor(GetSessionVersion()),
receiverChain.ChainKey.Key.ToByteArray(),
receiverChain.ChainKey.Index));
}
}
public void AddReceiverChain(IEcPublicKey senderRatchetKey, ChainKey chainKey)
{
SessionStructure.Types.Chain.Types.ChainKey chainKeyStructure = new SessionStructure.Types.Chain.Types.ChainKey
{
Key = ByteString.CopyFrom(chainKey.GetKey()),
Index = chainKey.GetIndex()
};
SessionStructure.Types.Chain chain = new SessionStructure.Types.Chain
{
ChainKey = chainKeyStructure,
SenderRatchetKey = ByteString.CopyFrom(senderRatchetKey.Serialize())
};
_sessionStructure.ReceiverChains.Add(chain);
while (_sessionStructure.ReceiverChains.Count > 5)
{
_sessionStructure.ReceiverChains.RemoveAt(0); //TODO why was here a TODO?
}
}
public void SetMessageKeys(IEcPublicKey senderEphemeral, MessageKeys messageKeys)
{
Pair <SessionStructure.Types.Chain, uint> chainAndIndex = GetReceiverChain(senderEphemeral);
SessionStructure.Types.Chain chain = chainAndIndex.First();
SessionStructure.Types.Chain.Types.MessageKey messageKeyStructure = new SessionStructure.Types.Chain.Types.MessageKey
{
CipherKey = ByteString.CopyFrom(messageKeys.GetCipherKey()),
MacKey = ByteString.CopyFrom(messageKeys.GetMacKey()),
Index = messageKeys.GetCounter(),
Iv = ByteString.CopyFrom(messageKeys.GetIv())
};
chain.MessageKeys.Add(messageKeyStructure);
if (chain.MessageKeys.Count > MaxMessageKeys)
{
chain.MessageKeys.RemoveAt(0);
}
_sessionStructure.ReceiverChains[(int)chainAndIndex.Second()] = chain;
}
public bool HasMessageKeys(IEcPublicKey senderEphemeral, uint counter)
{
Pair <SessionStructure.Types.Chain, uint> chainAndIndex = GetReceiverChain(senderEphemeral);
SessionStructure.Types.Chain chain = chainAndIndex.First();
if (chain == null)
{
return(false);
}
IList <SessionStructure.Types.Chain.Types.MessageKey> messageKeyList = chain.MessageKeys;
foreach (SessionStructure.Types.Chain.Types.MessageKey messageKey in messageKeyList)
{
if (messageKey.Index == counter)
{
return(true);
}
}
return(false);
}
public MessageKeys RemoveMessageKeys(IEcPublicKey senderEphemeral, uint counter)
{
Pair <SessionStructure.Types.Chain, uint> chainAndIndex = GetReceiverChain(senderEphemeral);
SessionStructure.Types.Chain chain = chainAndIndex.First();
if (chain == null)
{
return(null);
}
List <SessionStructure.Types.Chain.Types.MessageKey> messageKeyList = new List <SessionStructure.Types.Chain.Types.MessageKey>(chain.MessageKeys);
IEnumerator <SessionStructure.Types.Chain.Types.MessageKey> messageKeyIterator = messageKeyList.GetEnumerator();
MessageKeys result = null;
while (messageKeyIterator.MoveNext()) //hasNext()
{
SessionStructure.Types.Chain.Types.MessageKey messageKey = messageKeyIterator.Current; // next()
if (messageKey.Index == counter)
{
result = new MessageKeys(messageKey.CipherKey.ToByteArray(),
messageKey.MacKey.ToByteArray(),
messageKey.Iv.ToByteArray(),
messageKey.Index);
messageKeyList.Remove(messageKey); //messageKeyIterator.remove();
break;
}
}
chain.MessageKeys.Clear();
chain.MessageKeys.AddRange(messageKeyList);
_sessionStructure.ReceiverChains[(int)chainAndIndex.Second()] = chain;
return(result);
}