using UnityEngine;

using System.Collections;

using System.IO;

using System;

using System.Security.Cryptography;

using System.Text;

public static class MD5Tool

{

public static string GetFileMD5(string filePath)

{

try

{

FileInfo fileTmp = new FileInfo(filePath);

if (fileTmp.Exists)

{

FileStream fs = new FileStream(filePath, FileMode.Open);

int len = (int)fs.Length;

byte[] data = new byte[len];

fs.Close();

return GetMD5(data);

}

return "";

}

catch (FileNotFoundException e)

{

Debug.Log(e.Message);

return "";

}

}

public static string GetObjectMD5(object obj)

{

if(obj == null)

{

Debug.LogError("obj is Null !");

return "";

}

return GetMD5(ByteTool.Object2Bytes(obj));

}

public static int GetStringToHash(string content)

{

return GetHashMD5(System.Text.Encoding.Default.GetBytes(content));

}

public static string GetMD5FromString(string value)

{

MD5 md5 = new MD5CryptoServiceProvider();

byte[] output = md5.ComputeHash(Encoding.UTF8.GetBytes(value));

string sign = BitConverter.ToString(output).Replace("-", "");

return sign;

}

public static string GetMD5(byte[] data)

{

MD5 md5 = new MD5CryptoServiceProvider();

byte[] result = md5.ComputeHash(data);

string fileMD5 = "";

foreach (byte b in result)

{

fileMD5 += Convert.ToString(b, 16);

}

if (!String.IsNullOrEmpty(fileMD5))

{

return fileMD5;

}

return "";

}

public static int GetHashMD5(byte[] data)

{

MD5 md5 = new MD5CryptoServiceProvider();

byte[] result = md5.ComputeHash(data);

int hashCode = 0;

for (int i = 0; i < 4; i++)

{

hashCode += (Convert.ToInt32(result[i]) + Convert.ToInt32(result[i + 1]) + Convert.ToInt32(result[i + 2]) + Convert.ToInt32(result[i])) << i * 8;

}

return hashCode;

}

public static int ToHash(this string content)

{

return GetStringToHash(content);

}

}