简介：c#语言的加密与解密,主要是针对字符串的加密与解密操作

             核心操作就是把字符串变成二进制,将二进制数据编码为base 64 数字

             转换成等效的8 位无符号整数数组,转换成UTF-8等操作之间的相互转换

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加密操作：

        /// <summary>          /// 加密           /// </summary>          /// <param name="strText">要加密字符</param>          /// <param name="strEncrKey">编码</param>          /// <returns>返回加密后字符串</returns>          /// <author>PengZhen</author>          /// <time>2012年1月4日10:10:55</time>          public static string DesEncrypt(string strText, string strEncrKey)          {              byte[] byKey = null;              byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };              try              {                  byKey = System.Text.Encoding.UTF8.GetBytes(strEncrKey.Substring(0, strEncrKey.Length));                  DESCryptoServiceProvider des = new DESCryptoServiceProvider();                  byte[] inputByteArray = Encoding.UTF8.GetBytes(strText);                  MemoryStream ms = new MemoryStream();                  CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);                  cs.Write(inputByteArray, 0, inputByteArray.Length);                  cs.FlushFinalBlock();                  return Convert.ToBase64String(ms.ToArray());                }              catch (System.Exception error)              {                  return "error:" + error.Message + "";              }          }

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解密操作：

        /// <summary>          /// 解密           /// </summary>          /// <param name="strText">要解密字符</param>          /// <param name="sDecrKey">编码</param>          /// <returns>返回加密后字符串</returns>          /// <author>PengZhen</author>          /// <time>2012年1月4日10:11:06</time>          public static string DesDecrypt(string strText, string sDecrKey)          {              byte[] byKey = null;              byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };              byte[] inputByteArray = new Byte[strText.Length];              try              {                  byKey = System.Text.Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8));                  DESCryptoServiceProvider des = new DESCryptoServiceProvider();                  inputByteArray = Convert.FromBase64String(strText);                  MemoryStream ms = new MemoryStream();                  CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);                  cs.Write(inputByteArray, 0, inputByteArray.Length);                  cs.FlushFinalBlock();                  System.Text.Encoding encoding = new System.Text.UTF8Encoding();                  return encoding.GetString(ms.ToArray());              }              catch (System.Exception error)              {                  return "error:" + error.Message + "";              }          }

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调用代码：

            Console.WriteLine("需要加密的字符串：123456");              Console.WriteLine("加密、解密的密码：password");                            string strDesEncrypt=DesEncrypt("123456", "password");              Console.WriteLine("加密后的字符串："+strDesEncrypt);                string strDesDecrypt = DesDecrypt(strDesEncrypt, "password");              Console.WriteLine("解密后的字符串：" + strDesDecrypt);              Console.ReadLine();

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来自：http://blog.csdn.net/pengzhen8805/article/details/14059167