public static string CalculateSecurePinVersion9(string pin, byte[] pinKey, string cvv2 = "000", string expiryDate = "0000")
{
if (pinKey == null)
{
throw new ArgumentNullException("pinKey");
}
var pinBlockString = pin + cvv2 + expiryDate;
var clearPinBlock = "2" + pinBlockString.Length + pinBlockString;
const byte randomBytes = 0x0;
var randomDigit = (int)((randomBytes * 10) / 128);
randomDigit = Math.Abs(randomDigit);
var pinPadLength = 16 - clearPinBlock.Length;
for (var i = 0; i < pinPadLength; i++)
{
clearPinBlock += randomDigit;
}
var desEdeEngine = new DesEdeEngine();
var keyParameters = new DesEdeParameters(pinKey);
desEdeEngine.Init(true, keyParameters);
var clearPinBlockBytes = Hex.Decode(clearPinBlock);
var encryptedPinBlockBytes = new byte[8];
desEdeEngine.ProcessBlock(clearPinBlockBytes, 0, encryptedPinBlockBytes, 0);
var encodedEncryptedPinBlockBytes = Hex.Encode(encryptedPinBlockBytes);
var securePin = Encoding.UTF8.GetString(encodedEncryptedPinBlockBytes, 0, encodedEncryptedPinBlockBytes.Length);
return(securePin);
}
public static byte[] decrypt(String encryptedPINBlock, byte[] pinKey)
{
DesEdeEngine engine = new DesEdeEngine();
DesEdeParameters keyParameters = new DesEdeParameters(pinKey);
engine.Init(false, keyParameters);
byte[] encryptedPINBlockBytes = Hex.Encode(Encoding.UTF8.GetBytes(encryptedPINBlock));
byte[] clearPINBlockBytes = new byte[8];
int res = engine.ProcessBlock(encryptedPINBlockBytes, 0, clearPINBlockBytes, 0);
byte[] decodedClearPINBlockBytes = Hex.Decode(clearPINBlockBytes);
AppUtils.zeroise(encryptedPINBlockBytes);
AppUtils.zeroise(clearPINBlockBytes);
return(decodedClearPINBlockBytes);
}
public static byte[] encrypt(string clearPINBlock, byte[] pinKey)
{
DesEdeEngine engine = new DesEdeEngine();
DesEdeParameters keyParameters = new DesEdeParameters(pinKey);
engine.Init(true, keyParameters);
byte[] clearPINBlockBytes = Hex.Decode(clearPINBlock);
byte[] encryptedPINBlockBytes = new byte[8];
int res = engine.ProcessBlock(clearPINBlockBytes, 0, encryptedPINBlockBytes, 0);
byte[] encodedEncryptedPINBlock = Hex.Encode(encryptedPINBlockBytes);
AppUtils.zeroise(clearPINBlockBytes);
AppUtils.zeroise(encryptedPINBlockBytes);
return(encodedEncryptedPINBlock);
}