AES加解密

一個程序最忌諱的就是把本身的數據暴露給其餘人，一個加解密可讓你感受安全性好一些

直接上代碼

 

一個加密類

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
namespace Common
{
    public class AECHelper
    {
        const string AES_IV = "";//16位    

        static string key = "";
        /// <summary>        
        /// AES加密算法  
        /// </summary>  
        /// <param name="input">明文字符串</param>  
        /// <param name="key">密鑰（32位）</param>  
        /// <returns>字符串</returns>  
        public static string EncryptByAES(string input)
        {
            byte[] keyBytes = Encoding.UTF8.GetBytes(key.Substring(0, 32));
            using (AesCryptoServiceProvider aesAlg = new AesCryptoServiceProvider())
            {
                aesAlg.Key = keyBytes;
                aesAlg.IV = Encoding.UTF8.GetBytes(AES_IV.Substring(0, 16));

                ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
                using (MemoryStream msEncrypt = new MemoryStream())
                {
                    using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                    {
                        using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
                        {
                            swEncrypt.Write(input);
                        }
                        byte[] bytes = msEncrypt.ToArray();
                        return ByteArrayToHexString(bytes);
                    }
                }
            }
        }

        /// <summary>  
        /// AES解密  
        /// </summary>  
        /// <param name="input">密文字節數組</param>  
        /// <param name="key">密鑰（32位）</param>  
        /// <returns>返回解密後的字符串</returns>  
        public static string DecryptByAES(string input)
        {
            byte[] inputBytes = HexStringToByteArray(input);
            byte[] keyBytes = Encoding.UTF8.GetBytes(key.Substring(0, 32));
            using (AesCryptoServiceProvider aesAlg = new AesCryptoServiceProvider())
            {
                aesAlg.Key = keyBytes;
                aesAlg.IV = Encoding.UTF8.GetBytes(AES_IV.Substring(0, 16));

                ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
                using (MemoryStream msEncrypt = new MemoryStream(inputBytes))
                {
                    using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, decryptor, CryptoStreamMode.Read))
                    {
                        using (StreamReader srEncrypt = new StreamReader(csEncrypt))
                        {
                            return srEncrypt.ReadToEnd();
                        }
                    }
                }
            }
        }

        /// <summary>
        /// 將指定的16進制字符串轉換爲byte數組
        /// </summary>
        /// <param name="s">16進制字符串(如：「7F 2C 4A」或「7F2C4A」均可以)</param>
        /// <returns>16進制字符串對應的byte數組</returns>
        public static byte[] HexStringToByteArray(string s)
        {
            s = s.Replace(" ", "");
            byte[] buffer = new byte[s.Length / 2];
            for (int i = 0; i < s.Length; i += 2)
                buffer[i / 2] = (byte)Convert.ToByte(s.Substring(i, 2), 16);
            return buffer;
        }

        /// <summary>
        /// 將一個byte數組轉換成一個格式化的16進制字符串
        /// </summary>
        /// <param name="data">byte數組</param>
        /// <returns>格式化的16進制字符串</returns>
        public static string ByteArrayToHexString(byte[] data)
        {
            StringBuilder sb = new StringBuilder(data.Length * 3);
            foreach (byte b in data)
            {
                //16進制數字
                sb.Append(Convert.ToString(b, 16).PadLeft(2, '0'));
                //16進制數字之間以空格隔開
                //sb.Append(Convert.ToString(b, 16).PadLeft(2, '0').PadRight(3, ' '));
            }
            return sb.ToString().ToUpper();
        }
    }
}

 

加密

  Endresult = CryptoJS.EncryptByAES(Endresult);//加密
  string callback = HttpContext.Current.Request["jsoncallback"];
   if (!string.IsNullOrEmpty(callback))
   {
       context.Response.Write(callback + "({result:'" + Endresult + "'})");
   }
   else
   {
      context.Response.Write(Endresult);
   }

解密

string strHead = "";string ReqMessageBody = "";if (strHead != "")
{
   if (ReqMessageBody != "")
   {
        ReqMessageBody = ReqMessageBody.Replace(" ", "+");
        ReqMessageBody = CryptoJS.DecryptByAES(ReqMessageBody);//解密
   }
   strHead = strHead.Replace(" ", "+");
   strHead = CryptoJS.DecryptByAES(strHead);//解密
　　//解密以後就是一個字符串(你傳入的參數是什麼就是什麼)
}

 

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