/// <summary>
/// Sign the provided message using a Verifiable Random Function (VRF)
/// and if the result is less than param threshold provide the proof.
/// </summary>
/// <param name="message">The raw bytes of the message to sign.</param>
/// <param name="keypair">The keypair for signing.</param>
/// <param name="threshold">Threshold (byte array, 16 bytes).</param>
/// <param name="result">VRF signature output & proof.</param>
/// <returns>True if VRF signature was successful (and result below threshold)</returns>
public static bool VrfSignIfLess(byte[] message,
SR25519Keypair keypair, byte[] threshold, out VrfSignResult result)
{
result = null;
if (threshold?.Length != Constants.SR25519_VRF_THRESHOLD_SIZE)
{
throw new SR25519VrfException(StringConstants.BadVrfTresholdSizeMessage);
}
var vrfOutputAndProof = new byte[
Constants.SR25519_VRF_OUTPUT_SIZE +
Constants.SR25519_VRF_PROOF_SIZE
];
var rc = Bindings.VrfSignIfLess(
vrfOutputAndProof,
keypair.GetBytes(),
message,
Convert.ToUInt64(message.Length),
threshold);
result = new VrfSignResult(rc, vrfOutputAndProof);
return(rc.Result == Sr25519SignatureResult.Ok && rc.IsLess);
}
public void Ok()
{
BigInteger seed = new BigInteger(DateTime.Now.Ticks) << DateTime.Now.Second;
var rnd = new Random(BitConverter.ToInt32(seed.ToByteArray().Take(4).ToArray()));
var publicKey = new byte[32];
var secretKey = new byte[64];
var payload = new byte[64];
rnd.NextBytes(publicKey);
rnd.NextBytes(secretKey);
rnd.NextBytes(payload);
var pk = AddressUtils.GetPublicKeyFromAddr("5GWYBLjRtCQLXQmcyyRa6KaF1ihuqLjvVDE2gswJsEMxd9Qm");
var kp = new SR25519Keypair(pk.Bytes, secretKey);
var sig = SR25519.Sign(payload, (ulong)payload.Length, kp);
var arrayNotSame = new Func <byte[], bool>((btArr) => {
return(btArr.GroupBy((i) => i).Count() > 50);
});
Assert.True(sig.Length == 64);
Assert.True(arrayNotSame(sig));
}
/// <summary>
/// Get the byte array representation of a SR25519Keypair object.
/// </summary>
/// <param name="keys">The SR25519Keypair object.</param>
/// <returns>Byte array.</returns>
public static byte[] GetBytes(this SR25519Keypair keys)
{
var bytes = new byte[96];
Buffer.BlockCopy(keys.Secret, 0, bytes, 0, Constants.SR25519_SECRET_SIZE);
Buffer.BlockCopy(keys.Public, 0,
bytes, Constants.SR25519_SECRET_SIZE, Constants.SR25519_PUBLIC_SIZE);
return(bytes);
}
/// <summary>
/// Signs a message and returns the signature.
/// </summary>
/// <param name="message">The raw bytes of the message to sign.</param>
/// <param name="keypair">The keypair for signing.</param>
/// <returns>Signature as byte[]</returns>
public static byte[] Sign(byte[] message, SR25519Keypair keypair)
{
var signature = new byte[Constants.SR25519_SIGNATURE_SIZE];
Bindings.Sign(
signature, keypair.Public,
keypair.Secret, message, Convert.ToUInt64(message.Length));
return(signature);
}
/// <summary>
/// Signs a message and returns the signature.
/// </summary>
/// <param name="message">The message to sign.</param>
/// <param name="keypair">The keypair for signing.</param>
/// <returns>Signature as byte[]</returns>
public static byte[] Sign(string message, SR25519Keypair keypair)
{
var bytes = Encoding.UTF8.GetBytes(message);
var signature = new byte[Constants.SR25519_SIGNATURE_SIZE];
Bindings.Sign(
signature, keypair.Public,
keypair.Secret, bytes, Convert.ToUInt64(bytes.Length));
return(signature);
}
/// <summary>
/// Soft derive a new keypair from an existing keypair.
/// </summary>
/// <param name="keypair">Input keypair.</param>
/// <param name="chainCodeHex">Chain code as hex string.</param>
/// <returns>SR25519Keypair</returns>
public static SR25519Keypair SoftDeriveKeypair(SR25519Keypair keypair, string chainCodeHex)
{
byte[] chainCodeBytes = Utils.HexStringToByteArray(chainCodeHex);
if (chainCodeBytes.Length != Constants.SR25519_CHAINCODE_SIZE)
{
throw new SR25519KeypairException(StringConstants.BadChaincodeSizeMessage);
}
var bytes = keypair.GetBytes();
var derived = new byte[Constants.SR25519_KEYPAIR_SIZE];
Bindings.DeriveKeypairSoft(derived, bytes, chainCodeBytes);
return(new SR25519Keypair(derived));
}
/// <summary>
/// Signs a message and returns the signature.
/// </summary>
/// <param name="message">The message to sign.</param>
/// <param name="keypair">The keypair for signing.</param>
/// <returns>Signature as byte[]</returns>
public static byte[] Sign(byte[] message, ulong messageLen, SR25519Keypair keypair)
{
var signature = new byte[Constants.SR25519_SIGNATURE_SIZE];
if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
{
Bindings.SignSo(
signature, keypair.Public,
keypair.Secret, message, messageLen);
}
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
Bindings.Sign(
signature, keypair.Public,
keypair.Secret, message, messageLen);
}
return(signature);
}
private string ExtrinsicQueryString(byte[] encodedMethodBytes, string module, string method, Address sender, string privateKey)
{
_logger.Info("=== Started Invoking Extrinsic ===");
// Get account Nonce
var nonce = GetAccountNonce(sender);
var compactNonce = Scale.EncodeCompactInteger(nonce);
_logger.Info($"sender nonce: {nonce}");
byte[] mmBuf = new byte[3];
// Module + Method
var absoluteIndex = _protocolParams.Metadata.GetModuleIndex(module, false);
mmBuf[0] = (byte)_protocolParams.Metadata.GetModuleIndex(module, true);
mmBuf[1] = (byte)_protocolParams.Metadata.GetCallMethodIndex(absoluteIndex, method);
// Address separator
mmBuf[2] = Consts.ADDRESS_SEPARATOR;
Extrinsic ce = new Extrinsic();
var completeMessage = new byte[encodedMethodBytes.Length + 3];
mmBuf.CopyTo(completeMessage.AsMemory());
encodedMethodBytes.CopyTo(completeMessage.AsMemory(3));
// memcpy(completeMessage + 3, encodedMethodBytes, encodedMethodBytesSize);
ce.Signature.Version = Consts.SIGNATURE_VERSION;
var senderPK = _protocolParams.Metadata.GetPublicKeyFromAddr(sender);
ce.Signature.SignerPublicKey = senderPK.Bytes;
ce.Signature.Nonce = nonce;
ce.Signature.Era = ExtrinsicEra.IMMORTAL_ERA;
// Format signature payload
SignaturePayload sp = new SignaturePayload();
sp.Nonce = nonce;
sp.MethodBytesLength = encodedMethodBytes.Length + 3;
sp.MethodBytes = completeMessage;
sp.Era = ExtrinsicEra.IMMORTAL_ERA;
sp.AuthoringBlockHash = _protocolParams.GenesisBlockHash;
// Serialize and Sign payload
var signaturePayloadBytes = new byte[Consts.MAX_METHOD_BYTES_SZ];
long payloadLength = sp.SerializeBinary(ref signaturePayloadBytes);
var secretKeyVec = Converters.StringToByteArray(privateKey);
// p/invoke version
var kp = new SR25519Keypair(ce.Signature.SignerPublicKey, secretKeyVec);
var sig = SR25519.Sign(signaturePayloadBytes, (ulong)payloadLength, kp);
ce.Signature.Sr25519Signature = sig;
//// adopted version
//var sr25519 = new Sr25519();
//var message = signaturePayloadBytes.AsMemory().Slice(0, (int)payloadLength).ToArray();
//var sig2 = sr25519.Sign(secretKeyVec, te.Signature.SignerPublicKey, message);
//te.Signature.Sr25519Signature = sig2.ToBytes();
// Copy signature bytes to transaction
ce.Signature.Sr25519Signature = sig;
var length = Consts.DEFAULT_FIXED_EXSTRINSIC_SIZE + encodedMethodBytes.Length + compactNonce.Length - 1;
var compactLength = Scale.EncodeCompactInteger(length);
/////////////////////////////////////////
// Serialize message signature and write to buffer
long writtenLength = 0;
var buf = new byte[2048];
var buf2 = new List <byte>();
// Length
writtenLength += Scale.WriteCompactToBuf(compactLength, ref buf, writtenLength);
// Signature version
buf[writtenLength++] = ce.Signature.Version;
// Address separator
buf[writtenLength++] = Consts.ADDRESS_SEPARATOR;
// Signer public key
ce.Signature.SignerPublicKey.CopyTo(buf.AsMemory((int)writtenLength));
writtenLength += Consts.SR25519_PUBLIC_SIZE;
// SR25519 Signature
ce.Signature.Sr25519Signature.CopyTo(buf.AsMemory((int)writtenLength));
writtenLength += Consts.SR25519_SIGNATURE_SIZE;
// Nonce
writtenLength += Scale.WriteCompactToBuf(compactNonce, ref buf, writtenLength);
// Extrinsic Era
buf[writtenLength++] = (byte)ce.Signature.Era;
// Serialize and send transaction
var teBytes = new byte[Consts.MAX_METHOD_BYTES_SZ];
teBytes = buf;
completeMessage.AsMemory().CopyTo(teBytes.AsMemory((int)writtenLength));
long teByteLength = writtenLength + encodedMethodBytes.Length + 3;
return($"0x{Converters.ByteArrayToString(teBytes, (int)teByteLength)}");
}
public int SignAndSendTransfer(string sender, string privateKey, string recipient, BigInteger amount, Action <string> callback)
{
_logger.Info("=== Starting a Transfer Extrinsic ===");
// Get account Nonce
var address = new Address {
Symbols = sender
};
var nonce = GetAccountNonce(address);
_logger.Info($"sender nonce: {nonce} ");
// Format transaction
TransferExtrinsic te = new TransferExtrinsic();
te.Method.ModuleIndex = _protocolParams.BalanceModuleIndex;
te.Method.MethodIndex = _protocolParams.TransferMethodIndex;
var recipientPK = _protocolParams.Metadata.GetPublicKeyFromAddr(new Address(recipient));
te.Method.ReceiverPublicKey = recipientPK.Bytes;
te.Method.Amount = amount;
te.Signature.Version = Consts.SIGNATURE_VERSION;
var senderPK = _protocolParams.Metadata.GetPublicKeyFromAddr(new Address(sender));
te.Signature.SignerPublicKey = senderPK.Bytes;
te.Signature.Nonce = nonce;
te.Signature.Era = ExtrinsicEra.IMMORTAL_ERA;
// Format signature payload
SignaturePayload sp = new SignaturePayload();
sp.Nonce = nonce;
var methodBytes = new byte[Consts.MAX_METHOD_BYTES_SZ];
sp.MethodBytesLength = (int)te.SerializeMethodBinary(ref methodBytes);
sp.MethodBytes = methodBytes;
sp.Era = ExtrinsicEra.IMMORTAL_ERA;
sp.AuthoringBlockHash = _protocolParams.GenesisBlockHash;
// Serialize and Sign payload
var signaturePayloadBytes = new byte[Consts.MAX_METHOD_BYTES_SZ];
long payloadLength = sp.SerializeBinary(ref signaturePayloadBytes);
byte[] secretKeyVec = Converters.StringToByteArray(privateKey);
// p/invoke version
var kp = new SR25519Keypair(te.Signature.SignerPublicKey, secretKeyVec);
var sig = SR25519.Sign(signaturePayloadBytes, (ulong)payloadLength, kp);
te.Signature.Sr25519Signature = sig;
//// adopted version
//var sr25519 = new Sr25519();
//var message = signaturePayloadBytes.AsMemory().Slice(0, (int)payloadLength).ToArray();
//var sig2 = sr25519.Sign(secretKeyVec, te.Signature.SignerPublicKey, message);
//te.Signature.Sr25519Signature = sig2.ToBytes();
// Serialize and send transaction
var teBytes = new byte[Consts.MAX_METHOD_BYTES_SZ];
long teByteLength = te.SerializeBinary(ref teBytes);
string teStr = $"0x{Converters.ByteArrayToString(teBytes, (int)teByteLength)}";
var query = new JObject {
{ "method", "author_submitAndWatchExtrinsic" }, { "params", new JArray {
teStr
} }
};
// Send == Subscribe callback to completion
return(Subscribe(query, (json) =>
{
callback(json.ToString());
}));
}
