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;
}
