JAVA版本的Discuz Authcode
AuthCode.javapackage com.wyl.common.util;import java.io.*;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import java.util.*;public class AuthCode {public enum DiscuzAuthcodeMode {Encode, Decode};// private static MD5 md5 = new MD5();// private static BASE64 base64 = new BASE64();// / <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>public 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, 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>public static String CutString(String str, int startIndex) {return CutString(str, startIndex, str.length());}// / <summary>// / 返回文件是否存在// / </summary>// / <param name="filename">文件名</param>// / <returns>是否存在</returns>public static boolean FileExists(String filename) {File f = new File(filename);return f.exists();}// / <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) {// return md5.convert(str);StringBuffer sb = new StringBuffer();String part = null;try {MessageDigest md = MessageDigest.getInstance("MD5");byte[] md5 = md.digest(str.getBytes());for (int i = 0; i < md5.length; i++) {part = Integer.toHexString(md5 & 0xFF);if (part.length() == 1) {part = "0" + part;}sb.append(part);}} catch (NoSuchAlgorithmException ex) {}return sb.toString();}// / <summary>// / 字段串是否为Null或为""(空)// / </summary>// / <param name="str"></param>// / <returns></returns>public static boolean StrIsNullOrEmpty(String str) {// #if NET1if (str == null || str.trim().equals("")) {return true;}return false;}// / <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>static private byte[] GetKey(byte[] pass, int kLen) {byte[] mBox = new byte;for (int i = 0; i < kLen; i++) {mBox = (byte) i;}int j = 0;for (int i = 0; i < kLen; i++) {j = (j + (int) ((mBox + 256) % 256) + pass)% kLen;byte temp = mBox;mBox = mBox;mBox = 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>public 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', '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;}return sCode;}// / <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>// / <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 authcodeEncode(String source, String key, int expiry) {return authcode(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 authcodeEncode(String source, String key) {return authcode(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 authcodeDecode(String source, String key) {return authcode(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">加密字串过期时间</param>// / <returns>加密或者解密后的字符串</returns>private static String authcode(String source, String key,DiscuzAuthcodeMode operation, int expiry) {try {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;temp = Base64.decode(CutString(source, ckey_length));result = new String(RC4(temp, cryptkey));if (CutString(result, 10, 16).equals(CutString(MD5(CutString(result, 26) + keyb), 0, 16))) {return CutString(result, 26);} else {temp = Base64.decode(CutString(source + "=", ckey_length));result = new String(RC4(temp, cryptkey));if (CutString(result, 10, 16).equals(CutString(MD5(CutString(result, 26) + keyb), 0, 16))) {return CutString(result, 26);} else {temp = Base64.decode(CutString(source + "==",ckey_length));result = new String(RC4(temp, cryptkey));if (CutString(result, 10, 16).equals(CutString(MD5(CutString(result, 26) + keyb), 0,16))) {return CutString(result, 26);} else {return "2";}}}} else {source = "0000000000" + CutString(MD5(source + keyb), 0, 16)+ source;byte[] temp = RC4(source.getBytes("GBK"), cryptkey);return keyc + Base64.encodeBytes(temp);}} catch (Exception e) {return "";}}// / <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;byte[] mBox = GetKey(pass.getBytes(), 256);// 加密int i = 0;int j = 0;for (int offset = 0; offset < input.length; offset++) {i = (i + 1) % mBox.length;j = (j + (int) ((mBox + 256) % 256)) % mBox.length;byte temp = mBox;mBox = mBox;mBox = temp;byte a = input;// byte b = mBox[(mBox + mBox % mBox.Length) % mBox.Length];// mBox 一定比 mBox.Length 小，不需要在取模byte b = mBox[(toInt(mBox) + toInt(mBox)) % mBox.length];output = (byte) ((int) a ^ (int) toInt(b));}return output;}public static int toInt(byte b) {return (int) ((b + 256) % 256);}public long getUnixTimestamp() {Calendar cal = Calendar.getInstance();return cal.getTimeInMillis() / 1000;}public static void main(String[] args) {String test = "hello goto bed";String key = "123456";String afStr = AuthCode.authcodeEncode(test, key);System.out.println("--------encode:" + afStr);long lStart = System.currentTimeMillis();System.out.println("解码后：" + AuthCode.authcodeDecode(afStr, key));long lUseTime = System.currentTimeMillis() - lStart;System.out.println("加解密耗时：" + lUseTime + "毫秒");String deStr = AuthCode.authcodeDecode("0084tuF6jOu8bVvO//fcV6fXL/CCcUYVJby2nQOofjRasbvrqYNupR6eQJ2rDnhh1XvxWTft4Ub5TSdZA2Y3Ts0yhH8UrziYy5dXl3MHC5freHTOdAfgfFofcnQvLwo+BvD1hT7J9qw57Ral4NC+KNTc/Vj1CzPpftA5P6qUO3KB",key);System.out.println("--------decode:" + deStr);}}
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