using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ctrlCloud { /// <summary> /// Authcode加密解密帮助类 郑辰龙 20160408 /// </summary> public class AuthcodeHelper { 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> private static Encoding encoding = Encoding.GetEncoding("gbk"); /// <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[i].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[i] = (Byte)i; } Int64 j = 0; for (Int64 i = 0; i < kLen; i++) { j = (j + mBox[i] + pass[i % pass.Length]) % kLen; Byte temp = mBox[i]; mBox[i] = 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 为永久有效</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[i]) % mBox.Length; Byte temp = mBox[i]; mBox[i] = mBox[j]; mBox[j] = temp; Byte a = input[offset]; //Byte b = mBox[(mBox[i] + mBox[j] % mBox.Length) % mBox.Length]; // mBox[j] 一定比 mBox.Length 小，不需要在取模 Byte b = mBox[(mBox[i] + 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; } } }