C#版本的discuz authcode函数代码

根据网上流传甚广的一个版本修改，修正了设置加密串过期时间expiry没有效果的问题。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Text;
namespace API.Common
{
public enum DiscuzAuthcodeMode { Encode, Decode };
/// <summary>
/// C#版本 discuz authcode函数。根据网上版本修正设置expiry无效问题。by pwg17
/// </summary>
public class Authcode
{
private static Encoding encoding = Encoding.GetEncoding("gbk");
public Authcode()
{
}
/// <summary>
/// 从字符串的指定位置截取指定长度的子字符串
/// </summary>
/// <param name="str">原字符串</param>
/// <param name="startIndex">子字符串的起始位置</param>
/// <param name="length">子字符串的长度</param>
/// <returns>子字符串</returns>
private static string CutString(string str, int startIndex, int length)
{
if (startIndex >= 0)
{
if (length < 0)
{
length = length * -1;
if (startIndex - length < 0)
{
length = startIndex;
startIndex = 0;
}
else
{
startIndex = startIndex - length;
}
}
if (startIndex > str.Length)
{
return "";
}
}
else
{
if (length < 0)
{
return "";
}
else
{
if (length + startIndex > 0)
{
length = length + startIndex;
startIndex = 0;
}
else
{
return "";
}
}
}
if (str.Length - startIndex < length)
{
length = str.Length - startIndex;
}
return str.Substring(startIndex, length);
}
/// <summary>
/// 从字符串的指定位置开始截取到字符串结尾的了符串
/// </summary>
/// <param name="str">原字符串</param>
/// <param name="startIndex">子字符串的起始位置</param>
/// <returns>子字符串</returns>
private static string CutString(string str, int startIndex)
{
return CutString(str, startIndex, str.Length);
}
/// <summary>
/// MD5函数
/// </summary>
/// <param name="str">原始字符串</param>
/// <returns>MD5结果</returns>
public static string MD5(string str)
{
byte[] b = encoding.GetBytes(str);
b = new System.Security.Cryptography.MD5CryptoServiceProvider().ComputeHash(b);
string ret = "";
for (int i = 0; i < b.Length; i++)
{
ret += b.ToString("x").PadLeft(2, '0');
}
return ret;
}
/// <summary>
/// 用于 RC4 处理密码
/// </summary>
/// <param name="pass">密码字串</param>
/// <param name="kLen">密钥长度，一般为 256</param>
/// <returns></returns>
private static Byte[] GetKey(Byte[] pass, Int32 kLen)
{
Byte[] mBox = new Byte[kLen];
for (Int64 i = 0; i < kLen; i++)
{
mBox = (Byte)i;
}
Int64 j = 0;
for (Int64 i = 0; i < kLen; i++)
{
j = (j + mBox + pass[i % pass.Length]) % kLen;
Byte temp = mBox;
mBox = mBox[j];
mBox[j] = temp;
}
return mBox;
}
/// <summary>
/// 生成随机字符
/// </summary>
/// <param name="lens">随机字符长度</param>
/// <returns>随机字符</returns>
private static string RandomString(int lens)
{
char[] CharArray = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };
int clens = CharArray.Length;
string sCode = "";
Random random = new Random();
for (int i = 0; i < lens; i++)
{
sCode += CharArray[random.Next(clens)];
}
return sCode;
}
/// <summary>
/// 使用 authcode 方法对字符串加密
/// </summary>
/// <param name="source">原始字符串</param>
/// <param name="key">密钥</param>
/// <param name="expiry">加密字串有效时间，单位是秒</param>
/// <returns>加密结果</returns>
public static string DiscuzAuthcodeEncode(string source, string key, int expiry)
{
return DiscuzAuthcode(source, key, DiscuzAuthcodeMode.Encode, expiry);
}
/// <summary>
/// 使用 Discuz authcode 方法对字符串加密
/// </summary>
/// <param name="source">原始字符串</param>
/// <param name="key">密钥</param>
/// <returns>加密结果</returns>
public static string DiscuzAuthcodeEncode(string source, string key)
{
return DiscuzAuthcode(source, key, DiscuzAuthcodeMode.Encode, 0);
}
/// <summary>
/// 使用 Discuz authcode 方法对字符串解密
/// </summary>
/// <param name="source">原始字符串</param>
/// <param name="key">密钥</param>
/// <returns>解密结果</returns>
public static string DiscuzAuthcodeDecode(string source, string key)
{
return DiscuzAuthcode(source, key, DiscuzAuthcodeMode.Decode, 0);
}
/// <summary>
/// 使用 变形的 rc4 编码方法对字符串进行加密或者解密
/// </summary>
/// <param name="source">原始字符串</param>
/// <param name="key">密钥</param>
/// <param name="operation">操作 加密还是解密</param>
/// <param name="expiry">密文有效期, 加密时候有效， 单 位 秒，0 为长久有效</param>
/// <returns>加密或者解密后的字符串</returns>
private static string DiscuzAuthcode(string source, string key, DiscuzAuthcodeMode operation, int expiry)
{
if (source == null || key == null)
{
return "";
}
int ckey_length = 4;
string keya, keyb, keyc, cryptkey, result;
key = MD5(key);
keya = MD5(CutString(key, 0, 16));
keyb = MD5(CutString(key, 16, 16));
keyc = ckey_length > 0 ? (operation == DiscuzAuthcodeMode.Decode ? CutString(source, 0, ckey_length) : RandomString(ckey_length)) : "";
cryptkey = keya + MD5(keya + keyc);
if (operation == DiscuzAuthcodeMode.Decode)
{
byte[] temp;
try
{
temp = System.Convert.FromBase64String(CutString(source, ckey_length));
}
catch
{
try
{
temp = System.Convert.FromBase64String(CutString(source + "=", ckey_length));
}
catch
{
try
{
temp = System.Convert.FromBase64String(CutString(source + "==", ckey_length));
}
catch
{
return "";
}
}
}
result = encoding.GetString(RC4(temp, cryptkey));
long timestamp = long.Parse(CutString(result, 0, 10));
if ((timestamp == 0 || timestamp - UnixTimestamp() > 0) && CutString(result, 10, 16) == CutString(MD5(CutString(result, 26) + keyb), 0, 16))
{
return CutString(result, 26);
}
else
{
return "";
}
}
else
{
source = (expiry == 0 ? "0000000000" : (expiry + UnixTimestamp()).ToString()) + CutString(MD5(source + keyb), 0, 16) + source;
byte[] temp = RC4(encoding.GetBytes(source), cryptkey);
return keyc + System.Convert.ToBase64String(temp);
}
}
/// <summary>
/// RC4 原始算法
/// </summary>
/// <param name="input">原始字串数组</param>
/// <param name="pass">密钥</param>
/// <returns>处理后的字串数组</returns>
private static Byte[] RC4(Byte[] input, String pass)
{
if (input == null || pass == null) return null;
byte[] output = new Byte[input.Length];
byte[] mBox = GetKey(encoding.GetBytes(pass), 256);
// 加密
Int64 i = 0;
Int64 j = 0;
for (Int64 offset = 0; offset < input.Length; offset++)
{
i = (i + 1) % mBox.Length;
j = (j + mBox) % mBox.Length;
Byte temp = mBox;
mBox = mBox[j];
mBox[j] = temp;
Byte a = input[offset];
//Byte b = mBox[(mBox + mBox[j] % mBox.Length) % mBox.Length];
// mBox[j] 一定比 mBox.Length 小，不需要在取模
Byte b = mBox[(mBox + mBox[j]) % mBox.Length];
output[offset] = (Byte)((Int32)a ^ (Int32)b);
}
return output;
}
private static string AscArr2Str(byte[] b)
{
return System.Text.UnicodeEncoding.Unicode.GetString(
System.Text.ASCIIEncoding.Convert(System.Text.Encoding.ASCII,
System.Text.Encoding.Unicode, b)
);
}
public static long UnixTimestamp()
{
DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
DateTime dtNow = DateTime.Parse(DateTime.Now.ToString());
TimeSpan toNow = dtNow.Subtract(dtStart);
string timeStamp = toNow.Ticks.ToString();
return long.Parse(timeStamp.Substring(0, timeStamp.Length - 7));
}
public static string urlencode(string str)
{
//php的urlencode不同于HttpUtility.UrlEncode
//return HttpUtility.UrlEncode(str);
string tmp = string.Empty;
string strSpecial = "_-.1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
for (int i = 0; i < str.Length; i++)
{
string crt = str.Substring(i, 1);
if (strSpecial.Contains(crt))
tmp += crt;
else
{
byte[] bts = encoding.GetBytes(crt);
foreach (byte bt in bts)
{
tmp += "%" + bt.ToString("X");
}
}
}
return tmp;
}
public static long time()
{
TimeSpan ts = new TimeSpan(System.DateTime.UtcNow.Ticks - new DateTime(1970, 1, 1, 0, 0, 0).Ticks);
return (long)ts.TotalMilliseconds;
}
}
}

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