private static byte[] Decrypt(byte[] bytesData, byte[] bytesKey, DecryptTransformer transformer, byte[] initVec)
{
if (logger.IsDebugEnabled)
{
logger.Debug("DecryptPassword");
}
//// Set up the memory stream for the decrypted data.
MemoryStream memStreamDecryptedData = new MemoryStream();
//// Pass in the initialization vector.
transformer.IV = initVec;
ICryptoTransform transform =
transformer.GetCryptoServiceProvider(bytesKey);
CryptoStream decStream = new CryptoStream(memStreamDecryptedData,
transform,
CryptoStreamMode.Write);
try
{
decStream.Write(bytesData, 0, bytesData.Length);
}
catch (System.Exception ex)
{
////if (logger.IsErrorEnabled)
//// logger.Error("Exception", ex);
}
decStream.FlushFinalBlock();
decStream.Close();
return memStreamDecryptedData.ToArray();
} ////end Decrypt
public static string DecryptPassword(string encryptedPassword)
{
if (logger.IsDebugEnabled)
{
logger.Debug(string.Format("DecryptPassword({0})", encryptedPassword));
}
DecryptTransformer transformer;
byte[] initVec;
if ((encryptedPassword == null) || (encryptedPassword.Length == 0))
{
return String.Empty;
}
//// Set up the Decryptor object
transformer = new DecryptTransformer(EncryptionAlgorithm.TripleDes);
//// decode the iv + password
byte[] decodedPassword = Convert.FromBase64String(encryptedPassword);
byte[] lengthArray = new byte[2];
Array.Copy(decodedPassword, lengthArray, lengthArray.Length);
int length = int.Parse(Encoding.ASCII.GetString(lengthArray));
byte[] iv = new byte[length];
Array.Copy(decodedPassword, 2, iv, 0, iv.Length);
byte[] password = new byte[decodedPassword.Length - length - 2];
Array.Copy(decodedPassword, length + 2, password, 0, password.Length);
// Set the Initialization Vector
initVec = iv;
byte[] key = Encoding.ASCII.GetBytes(KEY);
//// Perform the decryption
byte[] plainText = Decrypt(password, key, transformer, initVec);
if (logger.IsDebugEnabled)
{
logger.Debug(string.Format("DecryptPassword({0})=> returns password", encryptedPassword));
}
//// Display the decrypted string.
return Encoding.ASCII.GetString(plainText);
}
