private void ExtractFinalChannelKeysForInitiator()
{
Span <byte> skAndRk = stackalloc byte[64];
_hkdf.ExtractAndExpand(HandshakeContext.ChainingKey, new byte[0].AsSpan(), skAndRk);
_messageTransformer.SetKeys(HandshakeContext.ChainingKey, skAndRk.Slice(0, 32),
skAndRk.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");
}
