DESCryptoServiceProvider 加密解密

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public static class Extend {         //注意：这里的密钥sKey必须能转为8个byte，即输入密钥为8半角个字符或者4个全角字符或者4个汉字的字符串         public static string strKey = "bingTest";         public static string strIV = "strTstIV";           // 加密         public static string Encrypt(string str)         {             byte[] buffer = Encoding.UTF8.GetBytes(str);             MemoryStream ms = new MemoryStream();             DESCryptoServiceProvider des = new DESCryptoServiceProvider();             CryptoStream encStream = new CryptoStream(ms, des.CreateEncryptor(Encoding.UTF8.GetBytes(strKey), Encoding.UTF8.GetBytes(strIV)), CryptoStreamMode.Write);             encStream.Write(buffer, 0, buffer.Length);             encStream.FlushFinalBlock();             //加密之后转为Base64字符串             string res64 = Convert.ToBase64String(ms.ToArray());            //将Base64字符串转为byte数组             var res64Tobt = Convert.FromBase64String(res64);             string result = string.Empty;             //byte数组转16进制字符串，如果加密的字符串需要在URL中传输的话，不然Base64字符串有特殊字符会被浏览器去掉，例如：+会变为空格             for (int i = 0; i < res64Tobt.Length; i++)             {                 result += string.Format("{0:x2}", res64Tobt[i]);             }             return result;         }           // 解密         public static string Decrypt(string str)         {             string result = string.Empty;             int str_lth = str.Length / 2;             byte[] strbt = new byte[str_lth];             //16进制字符串转byte数组             for (int i = 0; i < str_lth; i++)             {                 strbt[i] = Convert.ToByte(str.Substring(i * 2, 2), 16);             }             //byte数组转Base64字符串             string bas64 = Convert.ToBase64String(strbt);             //将Base64字符串转为byte数组             byte[] buffer = Convert.FromBase64String(bas64);             MemoryStream ms = new MemoryStream();             DESCryptoServiceProvider des = new DESCryptoServiceProvider();             CryptoStream encStream = new CryptoStream(ms, des.CreateDecryptor(Encoding.UTF8.GetBytes(strKey), Encoding.UTF8.GetBytes(strIV)), CryptoStreamMode.Write);             encStream.Write(buffer, 0, buffer.Length);             encStream.FlushFinalBlock();             result = Encoding.UTF8.GetString(ms.ToArray());             return result;         }     }