using System;
using System.Text;
using System.Security.Cryptography;
using System.IO;
 
using UnityEngine;
 
public class StringEncryption{
     
   #region  方法一 C#中對(duì)字符串加密解密（對(duì)稱算法）
   private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
   /// <summary>
   /// DES加密字符串
   /// </summary>
   /// <param name="encryptString">待加密的字符串</param>
   /// <param name="encryptKey">加密密鑰,要求為8位</param>
   /// <returns>加密成功返回加密后的字符串，失敗返回源串</returns>
   public static string EncryptDES(string encryptString, string encryptKey)
   {
       try
       {
           byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
           byte[] rgbIV = Keys;
           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();
           cStream.Close();
           return Convert.ToBase64String(mStream.ToArray());
       }
       catch
       {
           return encryptString;
       }
   }
     
   /// <summary>
   /// DES解密字符串
   /// </summary>
   /// <param name="decryptString">待解密的字符串</param>
   /// <param name="decryptKey">解密密鑰,要求為8位,和加密密鑰相同</param>
   /// <returns>解密成功返回解密后的字符串，失敗返源串</returns>
   public static string DecryptDES(string decryptString, string decryptKey)
   {
       try
       {
           byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
           byte[] rgbIV = Keys;
           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();
           cStream.Close();
           return Encoding.UTF8.GetString(mStream.ToArray());
       }
       catch
       {
           Debug.Log("catch");
           return decryptString;
       }
   }
   #endregion
     
     
     
     
     
     
   #region MD5不可逆加密
   //32位加密
   public string GetMD5_32(string s, string _input_charset) 
   { 
       MD5 md5 = new MD5CryptoServiceProvider(); 
       byte[] t = md5.ComputeHash(Encoding.GetEncoding(_input_charset).GetBytes(s)); 
       StringBuilder sb = new StringBuilder(32); 
       for (int i = 0; i < t.Length; i++) 
       { 
           sb.Append(t[i].ToString("x").PadLeft(2, '0')); 
       } 
       return sb.ToString(); 
   } 
 
   //16位加密 
   public static string GetMd5_16(string ConvertString) 
   { 
       MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider(); 
       string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4, 8); 
       t2 = t2.Replace("-", ""); 
       return t2; 
   }
   #endregion
}