public static ECKeyPair Decrypt(String password, WalletFile walletFile)
{
Validate(walletFile);
var crypto = walletFile.Crypto;
var mac = ByteUtils.ToByteArray(crypto.Mac);
var iv = ByteUtils.ToByteArray(crypto.Cipherparams.IV);
var cipherText = ByteUtils.ToByteArray(crypto.Ciphertext);
byte[] derivedKey;
var kdfParams = crypto.Kdfparams;
if (kdfParams is ScryptKdfParams)
{
var scryptKdfParams =
(ScryptKdfParams)crypto.Kdfparams;
int dklen = scryptKdfParams.Dklen;
int n = scryptKdfParams.N;
int p = scryptKdfParams.P;
int r = scryptKdfParams.R;
var salt = ByteUtils.ToByteArray(scryptKdfParams.Salt);
derivedKey = GenerateDerivedScryptKey(Encoding.UTF8.GetBytes(password), salt, n, r, p, dklen);
}
else if (kdfParams is Aes128CtrKdfParams)
{
var aes128CtrKdfParams =
(Aes128CtrKdfParams)crypto.Kdfparams;
int c = aes128CtrKdfParams.C;
String prf = aes128CtrKdfParams.Prf;
var salt = ByteUtils.ToByteArray(aes128CtrKdfParams.Salt);
derivedKey = GenerateAes128CtrDerivedKey(Encoding.UTF8.GetBytes(password), salt, c, prf);
}
else
{
throw new CipherException("Unable to deserialize params: " + crypto.Kdf);
}
var derivedMac = GenerateMac(derivedKey, cipherText);
if (!Arrays.Equals(derivedMac, mac))
{
throw new CipherException("Invalid password provided");
}
var encryptKey = Arrays.CopyOfRange(derivedKey, 0, 16);
var privateKey = PerformCipherOperation(false, iv, encryptKey, cipherText);
return(ECKeyPair.Create(privateKey));
}
public static WalletFile CreateWalletFile(
ECKeyPair ecKeyPair, byte[] cipherText, byte[] iv, byte[] salt, byte[] mac,
int n, int p)
{
var walletFile = new WalletFile
{
Address = ecKeyPair.GetHexAddress()
};
var crypto = new Crypto
{
Cipher = CIPHER,
Ciphertext = ByteUtils.ToHexString(cipherText, null)
};
walletFile.Crypto = crypto;
var cipherParams = new CipherParams
{
IV = ByteUtils.ToHexString(iv, null)
};
crypto.Cipherparams = cipherParams;
crypto.Kdf = SCRYPT;
var kdfParams = new ScryptKdfParams
{
Dklen = DKLEN,
N = n,
P = p,
R = R,
Salt = ByteUtils.ToHexString(salt, null)
};
crypto.Kdfparams = kdfParams;
crypto.Mac = ByteUtils.ToHexString(mac, null);
walletFile.Crypto = crypto;
walletFile.Id = Guid.NewGuid().ToString();
walletFile.Version = CURRENT_VERSION;
return(walletFile);
}
static void Validate(WalletFile walletFile)
{
var crypto = walletFile.Crypto;
if (walletFile.Version != CURRENT_VERSION)
{
throw new CipherException("Wallet version is not supported");
}
if (!crypto.Cipher.Equals(CIPHER))
{
throw new CipherException("Wallet cipher is not supported");
}
if (!crypto.Kdf.Equals(AES_128_CTR) && !crypto.Kdf.Equals(SCRYPT))
{
throw new CipherException("KDF type is not supported");
}
}
public WalletInfo(WalletFile walletFile, ECKeyPair keyPair)
{
this.WalletFile = walletFile;
this.KeyPair = keyPair;
}
