OpenSSL.NET Example

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace opensslnet_sample1
{
    class Program
    {
        static void Main(string[] args)
        {
            byte[] key = System.Text.Encoding.ASCII.GetBytes("password");
            byte[] data = System.Text.Encoding.ASCII.GetBytes("This is cleartext");
            byte[] iv = System.Text.Encoding.ASCII.GetBytes("1234");
            byte[] enc;
            byte[] dec;

            OpenSSL.Crypto.CipherContext cc = new OpenSSL.Crypto.CipherContext(OpenSSL.Crypto.Cipher.AES_256_ECB);
            enc = cc.Crypt(data, key, iv, true);
            System.Console.WriteLine("Cleartext = " + System.Text.Encoding.ASCII.GetString(data));
            System.Console.WriteLine("Encrypted = " + System.Text.Encoding.ASCII.GetString(enc));
            dec = cc.Decrypt(enc, key, iv);
            System.Console.WriteLine("Decrypted = " + System.Text.Encoding.ASCII.GetString(dec));
        }
    }
}