加密解密Url的類

 

using System;
using System.Security.Cryptography;
using System.IO;
using System.Text;

namespace NetBesttone.BaseClass
{
    /// <summary>
    /// 此類用來加密與解密存在於URL中的參數
    /// </summary>
    public class IaskUrlEncode
    {
        public IaskUrlEncode()
        {
            //
            // TODO: 在此處添加構造函數邏輯
            //
        }
        string _QueryStringKey = "abcdefgh"; //URL傳輸參數加密Key
        string _PassWordKey = "hgfedcba";//PassWord加密Key

        #region 公共方法
        /// <summary>
        /// 加密URL傳輸的字符串
        /// </summary>
        /// <param name="QueryString"></param>
        /// <returns></returns>
        public string EncryptQueryString(string QueryString)
        {
            return Encrypt(QueryString, _QueryStringKey);
        }


        /// <summary>
        /// 解密URL傳輸的字符串
        /// </summary>
        /// <param name="QueryString"></param>
        /// <returns></returns>
        public string DecryptQueryString(string QueryString)
        {
            return Decrypt(QueryString, _QueryStringKey);
        }


        /// <summary>
        /// 加密帳號口令
        /// </summary>
        /// <param name="PassWord"></param>
        /// <returns></returns>
        private string EncryptPassWord(string PassWord)
        {
            return Encrypt(PassWord, _PassWordKey);
        }


        /// <summary>
        /// 解密帳號口令
        /// </summary>
        /// <param name="PassWord"></param>
        /// <returns></returns>
        private string DecryptPassWord(string PassWord)
        {
            return Decrypt(PassWord, _PassWordKey);
        }
        #endregion

        #region 加密過程
        /// <summary>
        /// DEC 加密過程
        /// </summary>
        /// <param name="pToEncrypt"></param>
        /// <param name="sKey"></param>
        /// <returns></returns>
        private string Encrypt(string pToEncrypt, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();//把字符串放到byte數組中

            byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);

            des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);//建立加密對象的密鑰和偏移量
            des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);//原文使用ASCIIEncoding.ASCII方法的GetBytes方法
            MemoryStream ms = new MemoryStream();//使得輸入密碼必須輸入英文文本
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);

            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();

            StringBuilder ret = new StringBuilder();
            foreach (byte b in ms.ToArray())
            {
                ret.AppendFormat("{0:X2}", b);
            }
            ret.ToString();
            return ret.ToString();
        }
        #endregion

        #region 解密過程
        /// <summary>
        ///  DEC 解密過程
        /// </summary>
        /// <param name="pToDecrypt"></param>
        /// <param name="sKey"></param>
        /// <returns></returns>
        private string Decrypt(string pToDecrypt, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();

            byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
            for (int x = 0; x < pToDecrypt.Length / 2; x++)
            {
                int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
                inputByteArray[x] = (byte) i;
            }

            des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);//建立加密對象的密鑰和偏移量，此值重要，不能修改
            des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);

            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();

            StringBuilder ret = new StringBuilder();//建立StringBuilder對象，CreateDecrypt使用的是流對象，必須把解密後的文本變成流對象

            return System.Text.Encoding.Default.GetString(ms.ToArray());
        }
        #endregion

        #region 匹配過程
        /// <summary>
        /// 檢查己加密的字符串是否與原文相同
        /// </summary>
        /// <param name="EnString"></param>
        /// <param name="FoString"></param>
        /// <param name="Mode"></param>
        /// <returns></returns>
        private bool ValidateString(string EnString, string FoString, int Mode)
        {
            switch (Mode)
            {
            default:
            case 1:
                if (Decrypt(EnString, _QueryStringKey) == FoString.ToString())
                {
                    return true;
                }
                else
                {
                    return false;
                }
            case 2:
                if (Decrypt(EnString, _PassWordKey) == FoString.ToString())
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
        }
        #endregion
    }
}