public static byte[] GetPrivateKeyFromNEP2(string nep2, string passphrase, int N = 16384, int r = 8, int p = 8)
{
if (nep2 == null)
{
throw new ArgumentNullException(nameof(nep2));
}
if (passphrase == null)
{
throw new ArgumentNullException(nameof(passphrase));
}
byte[] data = nep2.Base58CheckDecode();
if (data.Length != 39 || data[0] != 0x01 || data[1] != 0x42 || data[2] != 0xe0)
{
throw new FormatException();
}
byte[] addresshash = new byte[4];
Buffer.BlockCopy(data, 3, addresshash, 0, 4);
byte[] derivedkey = SCrypt.DeriveKey(Encoding.UTF8.GetBytes(passphrase), addresshash, N, r, p, 64);
byte[] derivedhalf1 = derivedkey.Take(32).ToArray();
byte[] derivedhalf2 = derivedkey.Skip(32).ToArray();
byte[] encryptedkey = new byte[32];
Buffer.BlockCopy(data, 7, encryptedkey, 0, 32);
byte[] prikey = XOR(encryptedkey.AES256Decrypt(derivedhalf2), derivedhalf1);
ECPoint pubkey = Cryptography.ECC.ECCurve.Secp256r1.G * prikey;
UInt160 scriptHash = Contract.CreateSignatureRedeemScript(pubkey).ToScriptHash();
string address = scriptHash.ToAddress();
if (!Encoding.ASCII.GetBytes(address).Sha256().Sha256().Take(4).SequenceEqual(addresshash))
{
throw new FormatException();
}
return(prikey);
}
public static Contract CreateSignatureContract(ECPoint publicKey)
{
return(new Contract
{
Script = CreateSignatureRedeemScript(publicKey),
ParameterList = new[] { ContractParameterType.Signature }
});
}
public static byte[] CreateSignatureRedeemScript(ECPoint publicKey)
{
using (ScriptBuilder sb = new ScriptBuilder())
{
sb.EmitPush(publicKey.EncodePoint(true));
sb.Emit(OpCode.CHECKSIG);
return(sb.ToArray());
}
}
private bool OnImportMultisigAddress(string[] args)
{
if (NoWallet())
{
return(true);
}
if (args.Length < 5)
{
Console.WriteLine("Error. Use at least 2 public keys to create a multisig address.");
return(true);
}
int m = int.Parse(args[2]);
int n = args.Length - 3;
if (m < 1 || m > n || n > 1024)
{
Console.WriteLine("Error. Invalid parameters.");
return(true);
}
ECPoint[] publicKeys = args.Skip(3).Select(p => ECPoint.Parse(p, ECCurve.Secp256r1)).ToArray();
Contract multiSignContract = Contract.CreateMultiSigContract(m, publicKeys);
KeyPair keyPair = Program.Wallet.GetAccounts().FirstOrDefault(p => p.HasKey && publicKeys.Contains(p.GetKey().PublicKey))?.GetKey();
WalletAccount account = Program.Wallet.CreateAccount(multiSignContract, keyPair);
if (Program.Wallet is TERC1Wallet wallet)
{
wallet.Save();
}
Console.WriteLine("Multisig. Addr.: " + multiSignContract.Address);
return(true);
}
public WalletAccount GetAccount(ECPoint pubkey)
{
return(GetAccount(Contract.CreateSignatureRedeemScript(pubkey).ToScriptHash()));
}
