URL參數加密解密

標籤：length   param   public   convert   ati   傳參   input   encoding   nal   

/// <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 EncryptString(string encryptString, string encryptKey)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
                byte[] rgbIV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
                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();
                string s = Convert.ToBase64String(mStream.ToArray());
                s = s.Replace("+", ".").Replace("&", "/");
                //將加密的字串裡的+ &給替換到 否則URL傳參過去會失效\
                return s;
            }
            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 DecryptString(string decryptString,string decryptKey)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey.Substring(0, 8));
                byte[] rgbIV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
                //把要解密的字串的.跟/替換到原來沒有解密的樣子
                decryptString = decryptString.Replace(".", "+").Replace("/", "&");
                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();
                string s = Encoding.UTF8.GetString(mStream.ToArray());
                return s;
            }
            catch
            {
                return decryptString;
            }
        }

URL參數加密解密