ＤＮＳ１.cs

用c#实现的简单的des算法的小程序

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

using System.Security.Cryptography;
using System.IO;



namespace des
{
    class DNS1
    {

        public static string main(string args)
        {


            if (args.Length < 1)
            {
                Console.WriteLine("usage: des_demo <string-to-encrypt>", args);
                return "没有可加密的内容";
            }

            // 使用utf8函数加密输入参数
            UTF8Encoding utf8encoding = new UTF8Encoding();
            byte[] inputbytearray = utf8encoding.GetBytes(args);

            // 方式一：调用默认的des实现方法des_csp.
            DES des = DES.Create();
            // 方式二：直接使用des_csp()实现des的实体
            //des_csp des = new des_csp();

            // 初始化des加密的密钥和一个随机的、8比特的初始化向量(iv)
            byte[] key = { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef };
            byte[] iv = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef };
            des.Key = key;
            des.IV = iv;

            // 建立加密流
            ICryptoTransform sse = des.CreateEncryptor();
            MemoryStream ms = new MemoryStream();

            // 使用cryptomemorystream方法获取加密过程的输出
            // CryptoStream cms = new CryptoStream(ms, sse, CryptoStreamMode.Write);

            // 将symmetricstreamencryptor流中的加密数据输出到cryptomemorystream中
            // sse.setsink(cms);

            // 加密完毕，将结果输出到控制台
            //sse.write(inputbytearray);
            //sse.closestream();
            using (CryptoStream cs = new CryptoStream(ms, sse, CryptoStreamMode.Write))
            {
                cs.Write(inputbytearray, 0, inputbytearray.Length);
                cs.FlushFinalBlock();
                cs.Close();
            }
            string str = Convert.ToBase64String(ms.ToArray());

            // 获取加密数据
            //byte[] encrypteddata = cms.data;
            // return encrypteddata ;
            ms.Close();
            return str;

        }
        /*   public static string Decrypt(string pToDecrypt)
           {
               DESCryptoServiceProvider des = new DESCryptoServiceProvider();
               //Put the input string into the byte array 
               try
               {
                   byte[] inputByteArray = new byte[pToDecrypt.Length / 2];


                   for (int x = 0; x < pToDecrypt.Length / 2; x++)
                   {
                       int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
                       inputByteArray[x] = (byte)i;
                   }
                   //建立加密对象的密钥和偏移量，此值重要，不能修改 


                 inputByteArray = Convert.FromBase64String(pToDecrypt); 

                   byte[] key = { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef };
                   byte[] iv = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef };
                   des.Key = key;
                   des.IV = iv;
                   MemoryStream ms = new MemoryStream();
                   CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
                   cs.Write(inputByteArray, 0, inputByteArray.Length);
                   cs.FlushFinalBlock();
                   StringBuilder ret = new StringBuilder();
                   return System.Text.Encoding.Default.GetString(ms.ToArray());

               }
               catch (Exception ef)
               {
                   return ef.Message;

               }
           }
       }
       // public static UTF8Encoding b=new UTF8Encoding();
       //public static byte[] a = Encoding.ASCII.GetBytes(main());
       //public static string mailText = System.Text.Encoding.ASCII.GetString(Encoding.ASCII.GetBytes (main()));


       //  public string mailText = System.Text.Encoding.ASCII.GetString(encrypteddata, 0, encrypteddata.Length);*/
        public static string Decrypt(string decryptString)
        {
            try
            {
                byte[] rgbKey =  { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef };
                byte[] rgbIV =  { 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef };
                byte[] inputByteArray = Convert.FromBase64String(decryptString);
                DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Encoding.UTF8.GetString(mStream.ToArray());
            }
            catch
            {
                return decryptString;
            }
        }
    }
}