public string DecryptPrivateKey(string encryptJson, string passphrase)
{
KeystoreV3 keystoreV3 = JsonConvert.DeserializeObject <KeystoreV3>(encryptJson);
byte[] ciphertext = ByteUtil.HexStringToByteArray(keystoreV3.Crypto.Ciphertext);
byte[] iv = ByteUtil.HexStringToByteArray(keystoreV3.Crypto.Cipherparams.Iv);
Kdfparams kp = keystoreV3.Crypto.Kdfparams;
string kdf = keystoreV3.Crypto.Kdf;
byte[] derivedKey;
if (kdf == "pbkdf2")
{
PBKDF2Params pbkdf2Params = new PBKDF2Params();
pbkdf2Params.Salt = ByteUtil.ByteArrayToHexString(kp.Salt);
pbkdf2Params.DkLen = 32;
pbkdf2Params.Count = 262144;
derivedKey = GetDerivedKey(Encoding.Default.GetBytes(passphrase), pbkdf2Params);
}
else
{
ScryptParams scryptParams = new ScryptParams();
scryptParams.Salt = ByteUtil.ByteArrayToHexString(kp.Salt);
scryptParams.DkLen = 32;
scryptParams.P = 1;
scryptParams.R = 8;
scryptParams.N = 8192;
derivedKey = GetDerivedKey(Encoding.Default.GetBytes(passphrase), scryptParams);
}
string mac = ByteUtil.ByteArrayToHexString(HashUtil.GenerateMac(derivedKey, ciphertext));
if (mac.ToUpper() != keystoreV3.Crypto.Mac)
{
throw new Exception("Failed to decrypt.");
}
byte[] encryptKey = new byte[16];
Array.Copy(derivedKey, encryptKey, 16);
KeyStoreCrypto cry = new KeyStoreCrypto();
byte[] ciphertextByte = cry.GenerateAesCtrCipher(iv, encryptKey, ciphertext);
return(ByteUtil.ByteArrayToHexString(ciphertextByte));
}
public string EncryptPrivateKey(string privateKey, string passphrase, KDFType type)
{
string address = KeyTools.GetAddressFromPrivateKey(privateKey);
byte[] iv = KeyTools.GenerateRandomBytes(16);
byte[] salt = KeyTools.GenerateRandomBytes(32);
byte[] derivedKey;
if (type == KDFType.PBKDF2)
{
PBKDF2Params pbkdf2Params = new PBKDF2Params();
pbkdf2Params.Salt = ByteUtil.ByteArrayToHexString(salt);
pbkdf2Params.DkLen = 32;
pbkdf2Params.Count = 262144;
derivedKey = GetDerivedKey(Encoding.Default.GetBytes(passphrase), pbkdf2Params);
}
else
{
ScryptParams scryptParams = new ScryptParams();
scryptParams.Salt = ByteUtil.ByteArrayToHexString(salt);
scryptParams.DkLen = 32;
scryptParams.P = 1;
scryptParams.R = 8;
scryptParams.N = 8192;
derivedKey = GetDerivedKey(Encoding.Default.GetBytes(passphrase), scryptParams);
}
byte[] encryptKey = new byte[16];
Array.Copy(derivedKey, encryptKey, 16);
KeyStoreCrypto cry = new KeyStoreCrypto();
byte[] ciphertext = cry.GenerateAesCtrCipher(iv, encryptKey, ByteUtil.HexStringToByteArray(privateKey));
byte[] mac = HashUtil.GenerateMac(derivedKey, ciphertext);
//build struct
CipherParams cipherParams = new CipherParams();
cipherParams.Iv = ByteUtil.ByteArrayToHexString(iv);
Kdfparams kp = new Kdfparams(ByteUtil.ToSbyte(salt));
Crypto crypto = new Crypto();
crypto.Cipher = "aes-128-ctr";
crypto.Cipherparams = cipherParams;
crypto.Ciphertext = ByteUtil.ByteArrayToHexString(ciphertext);
crypto.Kdf = (type == KDFType.PBKDF2 ? "pbkdf2" : "scrypt");
crypto.Kdfparams = kp;
crypto.Mac = ByteUtil.ByteArrayToHexString(mac);
KeystoreV3 key = new KeystoreV3();
key.Address = address;
key.Crypto = crypto;
key.Id = Guid.NewGuid().ToString();
key.Version = 3;
return(JsonConvert.SerializeObject(key));
}