public static string Decrypt(string   cipherText,
                                 string   passPhrase,
                                 string   saltValue,
                                 string   hashAlgorithm,
                                 int      passwordIterations,
                                 string   initVector,
                                 int      keySize)
    {
 
byte[] initVectorBytes = Encoding.ASCII.GetBytes(initVector);
        byte[] saltValueBytes  = Encoding.ASCII.GetBytes(saltValue);
byte[] cipherTextBytes = Convert.FromBase64String(cipherText);
 
 PasswordDeriveBytes password = new PasswordDeriveBytes(
                                                        passPhrase, 
                                                        saltValueBytes, 
                                                        hashAlgorithm, 
                                                        passwordIterations);
 
byte[] keyBytes = password.GetBytes(keySize / 8);
 
 RijndaelManaged    symmetricKey = new RijndaelManaged();
 
symmetricKey.Mode = CipherMode.CBC;
 
ICryptoTransform decryptor = symmetricKey.CreateDecryptor(
keyBytes,  initVectorBytes);
 
MemoryStream  memoryStream = new MemoryStream(cipherTextBytes);
 CryptoStream  cryptoStream = new CryptoStream(memoryStream, 
decryptor, CryptoStreamMode.Read);
 
byte[] plainTextBytes = new byte[cipherTextBytes.Length];
int decryptedByteCount = cryptoStream.Read(plainTextBytes, 
 0,  plainTextBytes.Length);
 
memoryStream.Close();
cryptoStream.Close();
 
string plainText = Encoding.UTF8.GetString(plainTextBytes, 
 0,  decryptedByteCount);
 
return plainText;
 
}