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  • C# DES加密解密字符串

    //名称空间  
    using  System;  
    using  System.Security.Cryptography;  
    using  System.IO;  
    using  System.Text;
    
        /**/
        /// <summary>
        ///  DES算法描述简介:
        ///  DES是Data Encryption Standard(数据加密标准)的缩写。它是由IBM公司研制的一种加密算法,
        /// 美国国家标准局于1977年公布把它作为非机要部门使用的数据加密标准;
        /// 它是一个分组加密算法,他以64位为分组对数据加密。
        /// 同时DES也是一个对称算法:加密和解密用的是同一个算法。
        /// 它的密匙长度是56位(因为每个第8 位都用作奇偶校验),
        /// 密匙可以是任意的56位的数,而且可以任意时候改变.
        /// </summary>
        //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
            {
                byte[] Key = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
                byte[] IV = Keys;
                byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
                DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(Key, IV), 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 DescryptDES(string descryptString, string descryptKey)
        {
            try
            {
                byte[] Key = Encoding.UTF8.GetBytes(descryptKey.Substring(0,8));
                byte[] IV = Keys;
                byte[] inputByteArray = Convert.FromBase64String(descryptString);
                DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(Key, IV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Encoding.UTF8.GetString(mStream.ToArray());
            }
            catch
            {
                return descryptString;
            }
        }
    

    实例

        protected void Page_Load(object sender, EventArgs e)
        {
            Response.Write("加密字符:hello world!,密钥为:hongkaihua@126.com");
            string str = EncryptDES("hello world!","hongkaihua@126.com");
            Response.Write("DES加密:" + str);
            Response.Write("DES解密:" + DescryptDES(str, "hongkaihua@126.com"));
    
          }
    
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  • 原文地址:https://www.cnblogs.com/amylis_chen/p/2757729.html
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