public static byte[] GetPrivateKeyFromNEP2(string nep2, string passphrase, int N = 16384, int r = 8, int p = 8)
{
if (nep2 == null)
{
throw new ArgumentNullException("nep2");
}
if (passphrase == null)
{
throw new ArgumentNullException("passphrase");
}
byte[] data = Base58CheckDecode(nep2);
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(AES256Decrypt(encryptedkey, derivedhalf2), derivedhalf1);
var pubkey = GetPublicKeyFromPrivateKey(prikey);
var address = GetAddressFromPublicKey(pubkey);
var hash = Sha256(Encoding.ASCII.GetBytes(address));
hash = Sha256(hash);
for (var i = 0; i < 4; i++)
{
if (hash[i] != addresshash[i])
{
throw new Exception("check error.");
}
}
//Cryptography.ECC.ECPoint pubkey = Cryptography.ECC.ECCurve.Secp256r1.G * prikey;
//UInt160 script_hash = Contract.CreateSignatureRedeemScript(pubkey).ToScriptHash();
//string address = ToAddress(script_hash);
//if (!Encoding.ASCII.GetBytes(address).Sha256().Sha256().Take(4).SequenceEqual(addresshash))
// throw new FormatException();
return(prikey);
}
