C#加密解密DES字串<轉>

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using System;using System.Collections.Generic;using System.Text;using System.Security.Cryptography;using System.IO;namespace Component{    public class Security    {        public Security()        {                 }        //預設密鑰向量        private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };        /**//**//**//// <summary>        /// DES加密字串        /// </summary>        /// <param name="encryptString">待加密的字串</param>        /// <param name="encryptKey">加密金鑰,要求為8位</param>        /// <returns>加密成功返回加密後的字串，失敗返回源串</returns>        public static string EncryptDES(string encryptString, string encryptKey)        {            try            {                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解密字串        /// </summary>        /// <param name="decryptString">待解密的字串</param>        /// <param name="decryptKey">解密密鑰,要求為8位,和加密金鑰相同</param>        /// <returns>解密成功返回解密後的字串，失敗返源串</returns>        public static string DecryptDES(string decryptString, string decryptKey)        {            try            {                byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);                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;            }        }     }}

轉自：http://www.cnblogs.com/yiki/archive/2007/08/28/872373.html

C#加密解密DES字串<轉>