public static string GeneratePrivateKey()
{
var privateKey = new byte[32];
var rnd = System.Security.Cryptography.RandomNumberGenerator.Create();
rnd.GetBytes(privateKey);
return(Base58Encoding.EncodePrivateKey(privateKey));
}
public static (string privateKey, string AccountId) GenerateWallet(byte[] keyData)
{
var pvtKeyStr = Base58Encoding.EncodePrivateKey(keyData);
var pubKey = GetAccountIdFromPrivateKey(pvtKeyStr);
return(pvtKeyStr, pubKey);
}
public static (string privateKey, string AccountId) GenerateWallet(byte [] keyData)
{
var kp = new KeyPair(keyData);
var pvtKeyStr = Base58Encoding.EncodePrivateKey(keyData);
var pubKey = kp.PublicKey.EncodePoint(false).Skip(1).ToArray();
return(pvtKeyStr, Base58Encoding.EncodeAccountId(pubKey));
}
public static bool VerifyAuthorizerSignature(string message, string publicKey, string signature)
{
if (string.IsNullOrWhiteSpace(message) || !ValidatePublicKey(publicKey) || string.IsNullOrWhiteSpace(signature))
{
return(false);
}
var publicKeyBytes = Base58Encoding.DecodePublicKey(publicKey);
return(VerifySignature(message, publicKeyBytes, signature));
}
public static bool VerifyAccountSignature(string message, string accountId, string signature)
{
if (string.IsNullOrWhiteSpace(message) || !ValidateAccountId(accountId) || string.IsNullOrWhiteSpace(signature))
{
return(false);
}
var publicKeyBytes = Base58Encoding.DecodeAccountId(accountId);
return(VerifySignature(message, publicKeyBytes, signature));
}
public static bool ValidatePrivateKey(string PrivateKey)
{
try
{
Base58Encoding.DecodePrivateKey(PrivateKey);
return(true);
}
catch
{
return(false);
}
}
public override string ToString()
{
var b1 = R.ToByteArray();
var b2 = S.ToByteArray();
var buff = new byte[2 + b1.Length + b2.Length];
buff[0] = (byte)b1.Length;
buff[1] = (byte)b2.Length;
Buffer.BlockCopy(b1, 0, buff, 2, b1.Length);
Buffer.BlockCopy(b2, 0, buff, 2 + b1.Length, b2.Length);
return(Base58Encoding.Encode(buff));
}
public SignatureHolder(string signature)
{
var buff = Base58Encoding.Decode(signature);
var b1 = new byte[buff[0]];
var b2 = new byte[buff[1]];
Buffer.BlockCopy(buff, 2, b1, 0, b1.Length);
Buffer.BlockCopy(buff, 2 + b1.Length, b2, 0, b2.Length);
R = new BigInteger(b1);
S = new BigInteger(b2);
}
private static byte[] DerivePublicKeyBytes(string privateKey)
{
var curve = SecNamedCurves.GetByName("secp256r1");
var domain = new ECDomainParameters(curve.Curve, curve.G, curve.N, curve.H);
byte[] pkbytes = Base58Encoding.DecodePrivateKey(privateKey);
var d = new BigInteger(1, pkbytes);
var q = domain.G.Multiply(d);
var publicKey = new ECPublicKeyParameters(q, domain);
return(publicKey.Q.GetEncoded(false));
}
private static bool VerifySignature(string message, string AccountId, string signature)
{
try
{
var signatureBytes = Base58Encoding.Decode(signature);
var publicKeyBytes = Base58Encoding.DecodeAccountId(AccountId);
var result = Neo.Cryptography.Crypto.Default.VerifySignature(Encoding.UTF8.GetBytes(message), signatureBytes, publicKeyBytes);
return(result);
}
catch
{
//_log?.LogError("VerifySignature failed: " + ex.Message);
return(false);
}
}
public static bool ValidateAccountId(string AccountId)
{
try
{
if (string.IsNullOrWhiteSpace(AccountId) || AccountId[0] != LyraGlobal.ADDRESSPREFIX)
{
return(false);
}
Base58Encoding.DecodeAccountId(AccountId);
return(true);
}
catch
{
return(false);
}
}
public static string GetSignature(string privateKey, string message)
{
var curve = SecNamedCurves.GetByName("secp256r1");
var domain = new ECDomainParameters(curve.Curve, curve.G, curve.N, curve.H);
//byte[] pkbytes = Base58Encoding.Decode(privateKey);
//byte[] pkbytes = Base58Encoding.DecodeWithCheckSum(privateKey);
byte[] pkbytes = Base58Encoding.DecodePrivateKey(privateKey);
var keyParameters = new
ECPrivateKeyParameters(new BigInteger(1, pkbytes),
domain);
ISigner signer = SignerUtilities.GetSigner("SHA-256withECDSA");
signer.Init(true, keyParameters);
signer.BlockUpdate(Encoding.UTF8.GetBytes(message), 0, message.Length);
var signature = signer.GenerateSignature();
var netformat = SignatureHelper.ConvertDerToP1393(signature);
return(Base58Encoding.Encode(netformat));
}
public byte[] GetSharedSecret(string LocalPrivateKey, string RemoteAccountId)
{
//var pvtKey = Base58Encoding.DecodePrivateKey(privateKey);
//var kp = new Neo.Wallets.KeyPair(pvtKey);
//return Base58Encoding.EncodeAccountId(kp.PublicKey.EncodePoint(false).Skip(1).ToArray());
//var curve = SecNamedCurves.GetByName("secp256k1");
var curve = SecNamedCurves.GetByName("secp256r1");
var domain = new ECDomainParameters(curve.Curve, curve.G, curve.N, curve.H);
//byte[] pkbytes = Base58Encoding.DecodeWithCheckSum(LocalPrivateKey);
byte[] pkbytes = Base58Encoding.DecodePrivateKey(LocalPrivateKey);
var privateKeyParameters = new ECPrivateKeyParameters(new BigInteger(1, pkbytes), domain);
var dh = new ECDHCBasicAgreement();
dh.Init(privateKeyParameters);
//var publicKeyBytes = Base58Encoding.DecodeWithCheckSum(RemotePublicKey);
var publicKeyBytes = Base58Encoding.DecodeAccountId(RemoteAccountId);
//var q = curve.Curve.DecodePoint(publicKeyBytes);
var q = curve.Curve.CreatePoint(new BigInteger(1, publicKeyBytes.Take(32).ToArray()), new BigInteger(1, publicKeyBytes.Skip(32).ToArray()));
var publicKeyParameters = new ECPublicKeyParameters(q, domain);
var sharedSecret = dh.CalculateAgreement(publicKeyParameters);
using (var sha = SHA256.Create())
{
var hash = sha.ComputeHash(sharedSecret.ToByteArray());
return(hash);
}
}
public static string GetSignature(string privateKey, string message, string AccountId)
{
if (IsMono)
{
return(PortableSignatures.GetSignature(privateKey, message));
}
var publicKeyBytes = Base58Encoding.DecodeAccountId(AccountId);
var privateKeyBytes = Base58Encoding.DecodePrivateKey(privateKey);
var signature = Neo.Cryptography.Crypto.Default.Sign(Encoding.UTF8.GetBytes(message), privateKeyBytes, publicKeyBytes);
return(Base58Encoding.Encode(signature));
//Neo.Cryptography.ECC.ECDsa sa = new Neo.Cryptography.ECC.ECDsa(privateKeyBytes, Neo.Cryptography.ECC.ECCurve.Secp256r1);
//var sigInts = sa.GenerateSignature(Encoding.ASCII.GetBytes(message));
//var sh = new SignatureHolder(sigInts);
//var signature = sh.ToString();
////var vrt = VerifySignature(message, AccountId, signature);
//return signature;
}
public static string GetPublicKeyFromPrivateKey(string privateKey)
{
byte[] public_key_bytes = DerivePublicKeyBytes(privateKey);
return(Base58Encoding.EncodePublicKey(public_key_bytes));
}
public static string GetAccountIdFromPrivateKey(string privateKey)
{
byte[] public_key_bytes = DerivePublicKeyBytes(privateKey);
return(Base58Encoding.EncodeAccountId(public_key_bytes.Skip(1).ToArray())); // skip first byte which indicate compress or not.
}
