public virtual void Sign(EthereumEcdsa localPrivateKey, EthereumEcdsa ephemeralPrivateKey, EthereumEcdsa receiverPublicKey, uint?chainID = null)
{
// Generate the shared secret using ECDH between our local private key and this remote public key
byte[] ecdhKey = localPrivateKey.ComputeECDHKey(receiverPublicKey);
// If our nonce is null, generate a new one
Nonce = Nonce ?? RLPxSession.GenerateNonce();
// Verify the nonce is the correct length.
if (Nonce.Length != RLPxSession.NONCE_SIZE)
{
// Throw an exception if an invalid nonce was provided.
throw new ArgumentException($"Invalid size nonce provided for RLPx session when signing auth message. Should be {RLPxSession.NONCE_SIZE} bytes but was {Nonce?.Length}.");
}
// Obtain our transformed nonce data.
byte[] transformedNonceData = GetTransformedNonce(ecdhKey);
// Sign the transformed data.
var signature = ephemeralPrivateKey.SignData(transformedNonceData);
// We want our signature in r,s,v format.
R = BigIntegerConverter.GetBytes(signature.r, 32);
S = BigIntegerConverter.GetBytes(signature.s, 32);
V = EthereumEcdsa.GetVFromRecoveryID(chainID, signature.RecoveryID);
// Set our local public key and the public key hash.
PublicKey = localPrivateKey.ToPublicKeyArray(false, true);
}
protected void VerifyProperties()
{
// If our nonce is null, generate a new one
Nonce = Nonce ?? RLPxSession.GenerateNonce();
// Verify the ephemeral public key is not null and is the correct size.
if (EphemeralPublicKey?.Length != EthereumEcdsa.PUBLIC_KEY_SIZE)
{
throw new ArgumentException("Could not construct RLPx auth-ack because the provided ephemeral public key is not the correct size.");
}
// Verify the nonce is not null and is the correct size.
if (Nonce.Length != RLPxSession.NONCE_SIZE)
{
throw new ArgumentException("Could not construct RLPx auth-ack because the provided nonce is not the correct size.");
}
}
protected void VerifyProperties()
{
// If our nonce is null, generate a new one
Nonce = Nonce ?? RLPxSession.GenerateNonce();
// Verify the components are the correct size
if (R?.Length != 32)
{
throw new ArgumentException("RLPx EIP8 auth serialization failed because the signature R component must be 32 bytes.");
}
else if (S?.Length != 32)
{
throw new ArgumentException("RLPx EIP8 auth serialization failed because the signature R component must be 32 bytes.");
}
else if (PublicKey?.Length != EthereumEcdsa.PUBLIC_KEY_SIZE)
{
throw new ArgumentException($"RLPx EIP8 auth serialization failed because the public key must be {EthereumEcdsa.PUBLIC_KEY_SIZE} bytes in size.");
}
else if (Nonce.Length != RLPxSession.NONCE_SIZE)
{
throw new ArgumentException($"RLPx EIP8 auth serialization failed because the nonce must be {RLPxSession.NONCE_SIZE} bytes in size.");
}
}