Simple password encryption/ decryption code in C#.NET.

 public static byte[] encrypt(String plainText, String pw)
        {
            byte[] salt = Encoding.ASCII.GetBytes(pw.Length.ToString("F8"));
            Rfc2898DeriveBytes SecretKey = new Rfc2898DeriveBytes(pw, salt);
 
            byte[] Key = SecretKey.GetBytes(32);
            byte[] IV = SecretKey.GetBytes(16);
 
            // Check arguments.
            if (plainText == null || plainText.Length <= 0)
                throw new ArgumentNullException("plainText");
            if (Key == null || Key.Length <= 0)
                throw new ArgumentNullException("Key");
            if (IV == null || IV.Length <= 0)
                throw new ArgumentNullException("IV");
 
            // Declare the streams used
            // to encrypt to an in memory
            // array of bytes.
            MemoryStream msEncrypt = null;
            CryptoStream csEncrypt = null;
            StreamWriter swEncrypt = null;
 
            // Declare the RijndaelManaged object
            // used to encrypt the data.
            RijndaelManaged aesAlg = null;
 
            try
            {
                // Create a RijndaelManaged object
                // with the specified key and IV.
                aesAlg = new RijndaelManaged();
                aesAlg.Key = Key;
                aesAlg.IV = IV;
 
                // Create a decrytor to perform the stream transform.
                ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
 
                // Create the streams used for encryption.
                msEncrypt = new MemoryStream();
                csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write);
                swEncrypt = new StreamWriter(csEncrypt);
 
                //Write all data to the stream.
                swEncrypt.Write(plainText);
 
            }
            finally
            {
                // Clean things up.
 
                // Close the streams.
                if (swEncrypt != null)
                    swEncrypt.Close();
                if (csEncrypt != null)
                    csEncrypt.Close();
                if (msEncrypt != null)
                    msEncrypt.Close();
 
                // Clear the RijndaelManaged object.
                if (aesAlg != null)
                    aesAlg.Clear();
            }
 
            // Return the encrypted bytes from the memory stream.
            return msEncrypt.ToArray();
 
        }
 
public static String decrypt(byte[] cipherText, String pw)
        {
            byte[] salt = Encoding.ASCII.GetBytes(pw.Length.ToString("F8"));
            Rfc2898DeriveBytes SecretKey = new Rfc2898DeriveBytes(pw, salt);
 
            byte[] Key = SecretKey.GetBytes(32);
            byte[] IV = SecretKey.GetBytes(16);
 
            // Check arguments.
            if (cipherText == null || cipherText.Length <= 0)
                throw new ArgumentNullException("cipherText");
            if (Key == null || Key.Length <= 0)
                throw new ArgumentNullException("Key");
            if (IV == null || IV.Length <= 0)
                throw new ArgumentNullException("IV");
 
            // TDeclare the streams used
            // to decrypt to an in memory
            // array of bytes.
            MemoryStream msDecrypt = null;
            CryptoStream csDecrypt = null;
            StreamReader srDecrypt = null;
 
            // Declare the RijndaelManaged object
            // used to decrypt the data.
            RijndaelManaged aesAlg = null;
 
            // Declare the string used to hold
            // the decrypted text.
            string plaintext = null;
 
            try
            {
                // Create a RijndaelManaged object
                // with the specified key and IV.
                aesAlg = new RijndaelManaged();
                aesAlg.Key = Key;
                aesAlg.IV = IV;
 
                // Create a decrytor to perform the stream transform.
                ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
 
                // Create the streams used for decryption.
                msDecrypt = new MemoryStream(cipherText);
                csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read);
                srDecrypt = new StreamReader(csDecrypt);
 
                // Read the decrypted bytes from the decrypting stream
                // and place them in a string.
                plaintext = srDecrypt.ReadToEnd();
            }
            finally
            {
                // Clean things up.
 
                // Close the streams.
                if (srDecrypt != null)
                    srDecrypt.Close();
                if (csDecrypt != null)
                    csDecrypt.Close();
                if (msDecrypt != null)
                    msDecrypt.Close();
 
                // Clear the RijndaelManaged object.
                if (aesAlg != null)
                    aesAlg.Clear();
            }
 
            return plaintext;
 
        }

                                              

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