public void SetKeys(ReadOnlySpan <byte> chainingKey, ReadOnlySpan <byte> senderKey, ReadOnlySpan <byte> receiverKey)
{
chainingKey.CopyTo(_writerChainingKey.AsSpan());
chainingKey.CopyTo(_readerChainingKey.AsSpan());
_writer.SetKey(senderKey);
_reader.SetKey(receiverKey);
_keysSet = true;
}
private void ExtractNextKeys(ReadOnlySpan <byte> se)
{
Span <byte> ckAndTempKey = stackalloc byte[64];
_hkdf.ExtractAndExpand(HandshakeContext.ChainingKey, se, ckAndTempKey);
ckAndTempKey.Slice(0, 32).CopyTo(HandshakeContext.ChainingKey);
_aeadConstruction.SetKey(ckAndTempKey.Slice(32));
}
private void KeyRecycle(ICipherFunction cipherFunction, byte[] chainingKey)
{
if (cipherFunction.GetNonce() < LightningNetworkConfig.NUMBER_OF_NONCE_BEFORE_KEY_RECYCLE)
{
return;
}
_logger.LogDebug($"Recycling cipher key");
Span <byte> keys = stackalloc byte[Aead.KEY_SIZE * 2];
_hkdf.ExtractAndExpand(chainingKey, cipherFunction.GetKey(), keys);
// set new chaining key
keys.Slice(0, Aead.KEY_SIZE)
.CopyTo(chainingKey);
// set new key
cipherFunction.SetKey(keys.Slice(Aead.KEY_SIZE));
_logger.LogDebug($"Cipher key recycled successfully");
}