[Mono-aspnet-list] fixing CspParameters not supported by Mono in CryptDeriveKey call

Andrus kobruleht2 at hot.ee
Sat Dec 10 13:58:53 EST 2011

I try to port ASP .NET MVC2 password recovery code in http://stackoverflow.com/questions/7793108/where-to-find-c-sharp-sample-code-to-implement-password-recovery-in-asp-net-mvc

to Mono.
I it contains procedure below. In this CryptDeriveKey call causes exception in Mono

    CspParameters not supported by Mono

How to implement password recovery in Mono in ASP .NET MVC2 application ?

        /// <summary> 
        /// Takes a text message and encrypts it using a password as a key. 
        /// </summary> 
        /// <param name="plainMessage">A text to encrypt.</param> 
        /// <param name="password">The password to encrypt the message with.</param> 
        /// <returns>Encrypted string.</returns> 
        /// <remarks>This method uses TripleDES symmmectric encryption.</remarks> 
        public static string EncodeMessageWithPassword(string plainMessage, string password)
            if (plainMessage == null)
                throw new ArgumentNullException("encryptedMessage", "The message cannot be null");

            TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();
            des.IV = new byte[8];

            //Creates the key based on the password and stores it in a byte array. 
            PasswordDeriveBytes pdb = new PasswordDeriveBytes(password, new byte[0]);
            // in mono CryptDeriveKey causes exception:
            // CspParameters not supported by Mono
            des.Key = pdb.CryptDeriveKey("RC2", "MD5", 128, new byte[8]);

            MemoryStream ms = new MemoryStream(plainMessage.Length * 2);
            CryptoStream encStream = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
            byte[] plainBytes = Encoding.UTF8.GetBytes(plainMessage);
            encStream.Write(plainBytes, 0, plainBytes.Length);
            byte[] encryptedBytes = new byte[ms.Length];
            ms.Position = 0;
            ms.Read(encryptedBytes, 0, (int)ms.Length);

            return Convert.ToBase64String(encryptedBytes);


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