加密解密

官方文档

https://docs.microsoft.com/zh-cn/dotnet/api/system.security.cryptography.hashalgorithm?redirectedfrom=MSDN&view=netcore-3.0

加密--HashPasswordForStoringInConfigFile过时问题

http://www.bubuko.com/infodetail-1112769.html

public static string Encrypt(string Text, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray;
            inputByteArray = Encoding.Default.GetBytes(Text);
            des.Key = ASCIIEncoding.ASCII.GetBytes(MD5(sKey).Substring(0, 8));
            des.IV = ASCIIEncoding.ASCII.GetBytes(MD5(sKey.Substring(0, 8));
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            StringBuilder ret = new StringBuilder();
            foreach (byte b in ms.ToArray())
            {
                ret.AppendFormat("{0:X2}", b);
            }
            return ret.ToString();
        }
 
        public static string MD5(string str)
        {
            //微软md5方法参考return FormsAuthentication.HashPasswordForStoringInConfigFile(str, "md5");
            byte[] b = Encoding.Default.GetBytes(str);
            b = new MD5CryptoServiceProvider().ComputeHash(b);
            string ret = "";
            for (int i = 0; i < b.Length; i++)
                ret += b[i].ToString("X").PadLeft(2, '0');
            return ret;
        }

/// <summary> 
        /// 解密数据 
        /// </summary> 
        /// <param name="Text"></param> 
        /// <param name="sKey"></param> 
        /// <returns></returns> 
        public static string Decrypt(string Text, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            int len;
            len = Text.Length / 2;
            byte[] inputByteArray = new byte[len];
            int x, i;
            for (x = 0; x < len; x++)
            {
                i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);
                inputByteArray[x] = (byte)i;
            }

            des.Key = ASCIIEncoding.ASCII.GetBytes(MD5(sKey).Substring(0, 8)); 
            des.IV = ASCIIEncoding.ASCII.GetBytes(MD5(sKey).Substring(0, 8)); 
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            return Encoding.Default.GetString(ms.ToArray());
        }

#region 加密字符串
        /// <summary> /// 加密字符串   
        /// </summary>  
        /// <param name="str">要加密的字符串</param>  
        /// <param name="key">秘钥</param>  
        /// <returns>加密后的字符串</returns>  
        //public static string Encrypt(string str, string myKey)
        //{
        //    string encryptKeyall = Convert.ToString(myKey);    //定义密钥  
        //    if (encryptKeyall.Length < 9)
        //    {
        //        for (; ; )
        //        {
        //            if (encryptKeyall.Length < 9)
        //                encryptKeyall += encryptKeyall;
        //            else
        //                break;
        //        }
        //    }
        //    string encryptKey = encryptKeyall.Substring(0, 8);
        //    DESCryptoServiceProvider descsp = new DESCryptoServiceProvider();   //实例化加/解密类对象   

        //    byte[] key = Encoding.UTF8.GetBytes(encryptKey); //定义字节数组，用来存储密钥    
        //    byte[] data = Encoding.UTF8.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>  
        ///  <param name="myKey">秘钥</param>  
        /// <returns>解密后的字符串</returns>  
        public static string Decrypt(string str, string myKey)
        {
            string encryptKeyall = Convert.ToString(myKey);    //定义密钥  
            if (encryptKeyall.Length < 9)
            {
                for (; ; )
                {
                    if (encryptKeyall.Length < 9)
                        encryptKeyall += encryptKeyall;
                    else
                        break;
                }
            }
            string encryptKey = encryptKeyall.Substring(0, 8);
            DESCryptoServiceProvider descsp = new DESCryptoServiceProvider();   //实例化加/解密类对象    
            byte[] key = Encoding.UTF8.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.UTF8.GetString(MStream.ToArray());       //返回解密后的字符串  
        }