using System;   
using System.Configuration;     
using System.Security.Cryptography;   
using System.IO;   
using System.Text;
using UnityEngine;
using UnityEngine.UI;

/*
 * create by superbee, 2015-07-16
 */ 

public class DecryptionUtil
{

    private static string skey = "UnityBa1";

	public static string GetKey()
	{
		return skey;
	}
  
	/// <summary>  
	///   
	/// </summary>  
	/// <param name="pToDecrypt"> 待解密的字符串</param>  
	/// <param name="sKey"> 解密密钥,要求为8字节,和加密密钥相同</param>  
	/// <returns>解密成功返回解密后的字符串，失败返源串</returns>  
	public static string Decryption(string pToDecrypt)  
	{  
		//    HttpContext.Current.Response.Write(pToDecrypt + "<br>" + sKey);     
		//    HttpContext.Current.Response.End();     
		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);
        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();
		
		return System.Text.Encoding.Default.GetString(ms.ToArray());  
	}

	public static string Encryption(string pToEncrypt)
	{
		DESCryptoServiceProvider des = new DESCryptoServiceProvider();  
		byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);  
		des.Key = ASCIIEncoding.ASCII.GetBytes(skey);  
		des.IV = ASCIIEncoding.ASCII.GetBytes(skey); 
		MemoryStream ms = new MemoryStream();  
		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();
	}

}