public static string ExportToKeystore(KdfType kdfType, Wallet wallet, byte[] address, JsonSerializerSettings jsonSettings)
{
Contract.Assert(!string.IsNullOrWhiteSpace(wallet.PasswordHash));
var passwordHashBytes = Encoding.UTF8.GetBytes(wallet.PasswordHash);
var salt = CryptoUtil.RandomBytes(32);
var kdfparams = new
{
dklen = 32,
salt = salt.ToHex()
};
byte[] derivedKey;
switch (kdfType)
{
case KdfType.Scrypt:
{
derivedKey = PasswordHash.ScryptHashBinary(passwordHashBytes, salt, PasswordHash.Strength.Sensitive, kdfparams.dklen);
break;
}
case KdfType.Argon:
{
derivedKey = PasswordHash.ArgonHashBinary(passwordHashBytes, salt, PasswordHash.StrengthArgon.Sensitive, kdfparams.dklen);
break;
}
default:
throw new NotSupportedException("Unsupported kdf");
}
var iv = CryptoUtil.RandomBytes(32);
var pKey = wallet.GetPrivateKeyByAddress(address);
var nonce = derivedKey.Take(24).ToArray();
var box = SecretBox.CreateDetached(pKey, nonce, iv);
var keystore = new Keystore
{
Version = KeystoreVersion,
Id = wallet.Id,
Address = address.ToHex(),
Crypto = new KeystoreCrypto
{
CipherText = box.CipherText.ToHex(),
CipherParameters = new KeystoreCryptoParameters
{
Iv = iv.ToHex()
},
Cipher = "crypto_secretbox_detached",
Kdf = kdfType.ToString().ToLowerInvariant(),
KdfParameters = new KeystoreKdfParameters
{
Salt = kdfparams.salt,
DerivedKeyLength = kdfparams.dklen,
},
Mac = box.Mac.ToHex()
}
};
return(JsonConvert.SerializeObject(keystore, Formatting.None, jsonSettings));
}
