C# - Symmetric Encryption Class

Here is a class that encapsulates symmetric encryption using the TripleDES algorithm:

The module is written in C#, but as you know, you can interop with it from any .NET aware language. :cool:

Code:

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using System;
using System.Text;
using System.IO;
using System.Security.Cryptography;
using Encryption;

namespace Encryption {

    public class TripleDESEncryption {

        public static string EncryptData(string data, out byte[] desKey, out byte[] desIV) {               
              MemoryStream output = new MemoryStream();               
            byte[] byteData = new UnicodeEncoding().GetBytes(data);

              //Use the TripleDES symmetric encryption algorithm to encrypt our data. Without an IV, the                       
              //same input block of plaintext will encrypt to same output block of ciphertext. IV guarantees
            //output of two identical plaintext blocks are different.
            TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();
            CryptoStream crypt = new CryptoStream(output, des.CreateEncryptor(), CryptoStreamMode.Write);
               
            //Assign our crypto-generated key and iv values to our output arguments
            desKey = des.Key; desIV = des.IV;
            crypt.Write(byteData, 0, byteData.Length);                       

                crypt.Close(); output.Close();               
            return new UnicodeEncoding().GetString(output.ToArray());
        }

        public static string EncryptData(byte[] desKey, byte[] desIV, string data) {               
            MemoryStream output = new MemoryStream();               
            byte[] byteData = new UnicodeEncoding().GetBytes(data);

              //Use the TripleDES symmetric encryption algorithm to encrypt our data. Without an IV, the                       
              //same input block of plaintext will encrypt to same output block of ciphertext. IV guarantees
            //output of two identical plaintext blocks are different.
            TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();
            CryptoStream crypt = new CryptoStream(output, des.CreateEncryptor(desKey, desIV), CryptoStreamMode.Write);
            crypt.Write(byteData, 0, byteData.Length);                       

            crypt.Close(); output.Close();               
            return new UnicodeEncoding().GetString(output.ToArray());
        }

        public static string DecryptData(string data, byte[] desKey, byte[] desIV) {
            MemoryStream output = new MemoryStream();
            byte[] byteData = new UnicodeEncoding().GetBytes(data);

              //Use the TripleDES symmetric encryption algorithm to decrypt our data. In order for the ciphertext to be
            //successfully decrypted, the exact same key and iv must be used when initially encryted.
            TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();
            CryptoStream crypt = new CryptoStream(output, des.CreateDecryptor(desKey, desIV), CryptoStreamMode.Write);
            crypt.Write(byteData, 0, byteData.Length);

            crypt.Close(); output.Close();               
            return new UnicodeEncoding().GetString(output.ToArray());
        }
    }
}

class CipherText {

    static void Main() {
        byte[] key; byte[] iv;
        string password = "secret";               
        string cif = TripleDESEncryption.EncryptData(password, out key, out iv);
        Console.WriteLine(TripleDESEncryption.DecryptData(cif, key, iv));
       
        //NOTE: Key and IVector must be 16 bytes each
        //byte[] key = UnicodeEncoding.Unicode.GetBytes("cornhle");       
        //string cif = TripleDESEncryption.EncryptData(key, key, password);
        //Console.WriteLine(TripleDESEncryption.DecryptData(cif, key, key));
    }
}

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