C#进行加密操作

using System;
using System.Text;
using System.Security.Cryptography;

 class dsacrypto_SignData {
 public static void Main(String[] args){
  //先要将字符串转换为字节数组，这与编码有关。
  String str = "this is a test.";
  byte[] bytes = Encoding.ASCII.GetBytes(str);
  //选择签名方式，有RSA和DSA
  DSACryptoServiceProvider dsac = new DSACryptoServiceProvider();
  byte[] sign = dsac.SignData(bytes);
  //sign便是出来的签名结果。

  //下面是认证了
  DSACryptoServiceProvider dsac2 = new DSACryptoServiceProvider();
  dsac2.FromXmlString(dsac.ToXmlString(false));
  bool ver = dsac2.VerifyData(bytes, sign);
  if (ver) {
   Console.WriteLine("通过");
  } else {
   Console.WriteLine("不能通过");
  }
 }
 }