public byte[] GetPrivateKeyFromNEP2(string nep2, string passphrase)
{
// 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();
}
Debug.Log("nep2 " + nep2);
byte[] addresshash = new byte[4];
Buffer.BlockCopy(data, 3, addresshash, 0, 4);
Debug.Log("in nep2: " + passphrase);
byte[] derivedkey = SCrypt.DeriveKey(Encoding.UTF8.GetBytes(passphrase), addresshash, 16384, 8, 8, 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);
Neo.Cryptography.ECC.ECPoint pubkey = Neo.Cryptography.ECC.ECCurve.Secp256r1.G * prikey;
var bytes = pubkey.EncodePoint(true).ToArray();
// byte[] CompressedPublicKey = bytes;
// byte[] PublicKeyHash = Crypto.Default.ToScriptHash (bytes);
string signatureScript = KeyPair.CreateSignatureScript(bytes);
UInt160 signatureHash = Crypto.Default.ToScriptHash(signatureScript.HexToBytes());
byte[] publickey = pubkey.EncodePoint(false).Skip(1).ToArray();
string address = Crypto.Default.ToAddress(signatureHash);
Debug.Log("decrypted private key: " + prikey.ByteToHex());
Debug.Log("decrypted public key: " + publickey.ByteToHex());
Debug.Log("decrypted address: " + address);
return(prikey);
}
public static KeyPair Mnemonickeypair(string menimonic)
{
var getmenimonicBytes = Encoding.ASCII.GetBytes(menimonic);
var lengthofmenimonic = getmenimonicBytes.Length;
byte[] data = new byte[lengthofmenimonic];
data[0] = 0x80;
Buffer.BlockCopy(getmenimonicBytes, 0, data, 1, lengthofmenimonic - 2);
data[lengthofmenimonic - 1] = 0x01;
string wif = data.Base58CheckEncode();
Array.Clear(data, 0, data.Length);
if (wif == null)
{
throw new ArgumentNullException();
}
byte[] data1 = wif.Base58CheckDecode();
if (data1.Length != lengthofmenimonic || data1[0] != 0x80 || data1[lengthofmenimonic - 1] != 0x01)
{
throw new FormatException();
}
byte[] PrivateKeyOfmenimonic = new byte[32];
Buffer.BlockCopy(data1, 1, PrivateKeyOfmenimonic, 0, PrivateKeyOfmenimonic.Length);
Array.Clear(data1, 0, data1.Length);
KeyPair menimonickeypair = new KeyPair(PrivateKeyOfmenimonic);
var privatekeyBytes = menimonickeypair.PrivateKey;
var pubKeyBytes = menimonickeypair.PublicKey;
var privateKey = Base58.Encode(privatekeyBytes);
var pubKey = Base58.Encode(pubKeyBytes);
var sc = KeyPair.CreateSignatureScript(privatekeyBytes);
var address = menimonickeypair.address;
Console.WriteLine("\n In Function ................. : Private Key: " + privateKey + "\nPublic key:" + pubKey + "\n Address :" + address);
return(menimonickeypair);
}