ASP.NET中DES加密与解密MD5加密帮助类的实现代码

public class trialhelper
  {    //默认密钥向量
    private static byte[] keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef };
    /// <summary>
    /// des加密字符串
    /// </summary>
    /// <param name="encryptstring">待加密的字符串</param>
    /// <param name="encryptkey">加密密钥,要求为8位</param>
    /// <returns>加密成功返回加密后的字符串，失败返回源串</returns>
    public static string encryptdes( string encryptstring, string encryptkey = "" )
    {
      try
      {
        if (string.isnullorempty(encryptkey) || encryptkey.length < 8)
        {
          encryptkey = "winform01";
        }
        byte[] rgbkey = encoding.utf8.getbytes(encryptkey.substring(0, 8));
        byte[] rgbiv = keys;
        byte[] inputbytearray = encoding.utf8.getbytes(encryptstring);
        descryptoserviceprovider dcsp = new descryptoserviceprovider();
        memorystream mstream = new memorystream();
        cryptostream cstream = new cryptostream(mstream, dcsp.createencryptor(rgbkey, rgbiv), cryptostreammode.write);
        cstream.write(inputbytearray, 0, inputbytearray.length);
        cstream.flushfinalblock();
        return convert.tobase64string(mstream.toarray());
      }
      catch
      {
        return encryptstring;
      }
    }
    /// <summary>
    /// des解密字符串
    /// </summary>
    /// <param name="decryptstring">待解密的字符串</param>
    /// <param name="decryptkey">解密密钥,要求为8位,和加密密钥相同</param>
    /// <returns>解密成功返回解密后的字符串，失败返源串</returns>
    public static string decryptdes( string decryptstring, string decryptkey = "" )
    {
      try
      {
        if (string.isnullorempty(decryptkey) || decryptkey.length < 8)
        {
          decryptkey = "winform01";
        }
        byte[] rgbkey = encoding.utf8.getbytes(decryptkey.substring(0, 8));
        byte[] rgbiv = keys;
        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;
      }
    }
    /// <summary>
    /// md5数据加密
    /// </summary>
    /// <param name="sdatain">加密字段</param>
    /// <returns>加密后的字符串</returns>
    public static string getmd5( string sdatain )
    {
      system.security.cryptography.md5cryptoserviceprovider md5 = new system.security.cryptography.md5cryptoserviceprovider();
      byte[] bytvalue, bythash;
      bytvalue = system.text.encoding.utf8.getbytes(sdatain);
      bythash = md5.computehash(bytvalue);
      md5.clear();
      string stemp = "";
      for (int i = 0; i < bythash.length; i++)
      {
        stemp += bythash[i].tostring("x").padleft(2, '0');
      }
      return stemp;
    }
  }

    调用：              

//获取登录信息
        loginrecord.name = tbname.text.trim();
        loginrecord.md5pwd = trialhelper.getmd5(tbpwd.password); //保存到数据库md5加密方式
        loginrecord.pwd = trialhelper.encryptdes(tbpwd.password);//记住密码des加密方式，保存到本地

以上所述是小编给大家介绍的asp.net中des加密与解密md5加密帮助类，希望对大家有所帮助