ASP.NET C# URL加密解密

需要引用的类名空间
Code
using System.Security.Cryptography;
using System.IO;
using System.text;
Code
  /// <summary>
        /// 加密
        /// </summary>
        /// <param name=\”str\”></param>
        /// <param name=\”key\”></param>
        /// <returns></returns>
        public static string Encode(string str, string key)
        {
            DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
            provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));
            provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));
            byte[] bytes = Encoding.GetEncoding(\”GB2312\”).GetBytes(str);
            MemoryStream stream = new MemoryStream();
            CryptoStream stream2 = new CryptoStream(stream, provider.CreateEncryptor(), CryptoStreamMode.Write);
            stream2.Write(bytes, 0, bytes.Length);
            stream2.FlushFinalBlock();
            StringBuilder builder = new StringBuilder();
            foreach (byte num in stream.ToArray())
            {
                builder.AppendFormat(\”{0:X2}\”, num);
            }
            stream.Close();
            return builder.ToString();
        }

        /// <summary>
        /// Des 解密 GB2312
        /// </summary>
        /// <param name=\”str\”>Desc string</param>
        /// <param name=\”key\”>Key ,必须为8位 </param>
        /// <returns></returns>
        public static string Decode(string str, string key)
        {
            DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
            provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));
            provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));
            byte[] buffer = new byte[str.Length / 2];
            for (int i = 0; i < (str.Length / 2); i++)
            {
                int num2 = Convert.ToInt32(str.Substring(i * 2, 2), 0x10);
                buffer[i] = (byte)num2;
            }
            MemoryStream stream = new MemoryStream();
            CryptoStream stream2 = new CryptoStream(stream, provider.CreateDecryptor(), CryptoStreamMode.Write);
            stream2.Write(buffer, 0, buffer.Length);
            stream2.FlushFinalBlock();
            stream.Close();
            return Encoding.GetEncoding(\”GB2312\”).GetString(stream.ToArray());
        }

调用方法
/// <summary>
        /// If don\’t input key , Use default key
        /// Des 加密 GB2312 :
        /// </summary>
        /// <param name=\”str\”></param>
        /// <returns></returns>
        public static string Encode(string str)
        {
            return VerifyTool.Encode(str, \”Rainight\”);
        }
        /// <summary>
        /// 解密
        /// </summary>
        /// <param name=\”str\”></param>
        /// <returns></returns>
        public static string Decode(string str)
        {
            return VerifyTool.Decode(str, \”Rainight\”);
        }