c# 几种常见的加密方法的实现

1.acsii码加密

//acsii码加密
    private static string acsiipwd(string rpwd)
    {
      string ret;
      byte[] array = system.text.encoding.ascii.getbytes(rpwd);
      byte[] bytearray = new byte[array.length];

      for (int i = 0; i < array.length; i++)
      {
        int asciicode = (int)(array[i]);
        asciicode = asciicode + 1;
        bytearray[i] = (byte)asciicode;
      }
      system.text.asciiencoding asciiencoding = new system.text.asciiencoding();
      string strcharacter = asciiencoding.getstring(bytearray);
      ret = strcharacter;
      return ret;
    }

2.md5加密

//md5加密
    private static string md5pwd(string rpwd)
    {
      string ret;

      md5 md5 = new md5cryptoserviceprovider();
      byte[] palindata = encoding.default.getbytes(rpwd);//将要加密的字符串转换为字节数组
      byte[] encryptdata = md5.computehash(palindata);//将字符串加密后也转换为字符数组
      ret = convert.tobase64string(encryptdata);
      return ret;
    }

3.rsa加密

//rsa加密
    private static string rsapwd1(string mykeycontainername)
    {
      string ret = "";     
      cspparameters cp = new cspparameters();
      cp.keycontainername = mykeycontainername;
      rsacryptoserviceprovider rsa = new rsacryptoserviceprovider(cp);
      
      ret = rsa.toxmlstring(true);
      console.writeline("key is : \n" + rsa.toxmlstring(true));
      return ret;

    }

4.des加密

//des加密 
    private static string despwd(string ciphertext)
    {
      string despwd = ""; 
      byte[] buffer;
      descryptoserviceprovider descsp = new descryptoserviceprovider();

      memorystream ms = new memorystream();//先创建 一个内存流
      cryptostream crystream = new cryptostream(ms, descsp.createencryptor(), cryptostreammode.write);//将内存流连接到加密转换流
      streamwriter sw = new streamwriter(crystream);
      sw.writeline(ciphertext);//将要加密的字符串写入加密转换流
      sw.close();
      crystream.close();
      buffer = ms.toarray();//将加密后的流转换为字节数组
      despwd = convert.tobase64string(buffer);//将加密后的字节数组转换为字符串

      return despwd;
    }

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