C#对字符串的简单加密解密过程C#的SQL数据库登陆密码的加密解密加密还原直接复制代码使用即可

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

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

namespace PDAPrint
{
    class ClassSecurityString
    {
        public static string encryptKey = "www.hanma-scan.com";    //定义密钥  

        public static string Encrypt(string str)
        {
            DESCryptoServiceProvider descsp = new DESCryptoServiceProvider();   //实例化加/解密类对象   

            byte[] key = Encoding.Unicode.GetBytes(encryptKey); //定义字节数组，用来存储密钥    

            byte[] data = Encoding.Unicode.GetBytes(str);//定义字节数组，用来存储要加密的字符串  

            MemoryStream MStream = new MemoryStream(); //实例化内存流对象      

            //使用内存流实例化加密流对象
            CryptoStream CStream = new CryptoStream(MStream, descsp.CreateEncryptor(key, key), CryptoStreamMode.Write);     

            CStream.Write(data, 0, data.Length);  //向加密流中写入数据      

            CStream.FlushFinalBlock();              //释放加密流      

            return Convert.ToBase64String(MStream.ToArray());//返回加密后的字符串
        }  

        /// <summary>
        /// 解密字符串
        /// </summary>
        /// <param name="str">要解密的字符串</param>
        /// <returns>解密后的字符串</returns>
        public static string Decrypt(string str)
        {
            DESCryptoServiceProvider descsp = new DESCryptoServiceProvider();   //实例化加/解密类对象    

            byte[] key = Encoding.Unicode.GetBytes(encryptKey); //定义字节数组，用来存储密钥    

            byte[] data = Convert.FromBase64String(str);//定义字节数组，用来存储要解密的字符串  

            MemoryStream MStream = new MemoryStream(); //实例化内存流对象      

            //使用内存流实例化解密流对象
            CryptoStream CStream = new CryptoStream(MStream, descsp.CreateDecryptor(key, key), CryptoStreamMode.Write);   

            CStream.Write(data, 0, data.Length);      //向解密流中写入数据     

            CStream.FlushFinalBlock();               //释放解密流      

            return Encoding.Unicode.GetString(MStream.ToArray());       //返回解密后的字符串
        }  

    }
}

private void button10_Click(object sender, EventArgs e)

{

string str = "123";     //记录输入的字符串

string strNew =ClassSecurityString.Encrypt(str);              //加密字符串

string strOld = ClassSecurityString.Decrypt(strNew);

MessageBox.Show("【加密：" + strNew + @"】" + "【解密：" + strOld + @"】");

}

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