discuz 的加密算法原版(PHP)
// $string： 明文 或 密文
// $operation：DECODE表示解密,其它表示加密
// $key： 密匙
// $expiry：密文有效期
function authcode($string, $operation = 'DECODE', $key = '', $expiry = 600) {
// 动态密匙长度，相同的明文会生成不同密文就是依靠动态密匙
$ckey_length = 4;
// 密匙
$key = md5($key);
// 密匙a会参与加解密
$keya = md5(substr($key, 0, 16));
// 密匙b会用来做数据完整性验证
$keyb = md5(substr($key, 16, 16));
// 密匙c用于变化生成的密文
$keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : '';
// 参与运算的密匙
$cryptkey = $keya.md5($keya.$keyc);
$key_length = strlen($cryptkey);
// 明文，前10位用来保存时间戳，解密时验证数据有效性，10到26位用来保存$keyb(密匙b)，解密时会通过这个密匙验证数据完整性
// 如果是解码的话，会从第$ckey_length位开始，因为密文前$ckey_length位保存 动态密匙，以保证解密正确
$string = $operation == 'DECODE' ? base64_decode(substr($string, $ckey_length)) : sprintf('%010d', $expiry ? $expiry + time() : 0).substr(md5($string.$keyb), 0, 16).$string;
$string_length = strlen($string);
$result = '';
$box = range(0, 255);
$rndkey = array();
// 产生密匙簿
for($i = 0; $i <= 255; $i++) {
$rndkey[$i] = ord($cryptkey[$i % $key_length]);
}
// 用固定的算法，打乱密匙簿，增加随机性，好像很复杂，实际上对并不会增加密文的强度
for($j = $i = 0; $i < 256; $i++) {
$j = ($j + $box[$i] + $rndkey[$i]) % 256;
$tmp = $box[$i];
$box[$i] = $box[$j];
$box[$j] = $tmp;
}
// 核心加解密部分
for($a = $j = $i = 0; $i < $string_length; $i++) {
$a = ($a + 1) % 256;
$j = ($j + $box[$a]) % 256;
$tmp = $box[$a];
$box[$a] = $box[$j];
$box[$j] = $tmp;
// 从密匙簿得出密匙进行异或，再转成字符
$result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
}
if($operation == 'DECODE') {
// substr($result, 0, 10) == 0 验证数据有效性
// substr($result, 0, 10) - time() > 0 验证数据有效性
// substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16) 验证数据完整性
// 验证数据有效性，请看未加密明文的格式
if((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16)) {
return substr($result, 26);
} else {
return '';
}
} else {
// 把动态密匙保存在密文里，这也是为什么同样的明文，生产不同密文后能解密的原因
// 因为加密后的密文可能是一些特殊字符，复制过程可能会丢失，所以用base64编码
return $keyc.str_replace('=', '', base64_encode($result));
}
}
网友写的 Java 版(没测试)
import java.io.File;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Calendar;
import java.util.Random;
public class AuthCodeUtil {
public enum DiscuzAuthcodeMode {
Encode, Decode
};
/// <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.getMD5ofStr(str);
// }
/// <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 NET1
if (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[kLen];
for (int i = 0; i < kLen; i++) {
mBox[i] = (byte) i;
}
int j = 0;
for (int i = 0; i < kLen; i++) {
j = (j + (int) ((mBox[i] + 256) % 256) + 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>
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[Math.abs(random.nextInt(clens))];
}
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 = 0;
String keya, keyb, keyc, cryptkey, result;
key = MD52(key);
keya = MD52(CutString(key, 0, 16));
keyb = MD52(CutString(key, 16, 16));
keyc = ckey_length > 0 ? (operation == DiscuzAuthcodeMode.Decode ? CutString(
source, 0, ckey_length)
: RandomString(ckey_length))
: "";
cryptkey = keya + MD52(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(MD52(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(MD52(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(MD52(CutString(result, 26) + keyb), 0, 16))) {
return CutString(result, 26);
}else{
return "2";
}
}
}
} else {
source = "0000000000" + CutString(MD52(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[input.length];
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[i] + 256) % 256)) % 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[(toInt(mBox[i]) + toInt(mBox[j])) % mBox.length];
output[offset] = (byte) ((int) a ^ (int) toInt(b));
}
return output;
}
public static String MD52(String MD5) {
StringBuffer sb = new StringBuffer();
String part = null;
try {
MessageDigest md = MessageDigest.getInstance("MD5");
byte[] md5 = md.digest(MD5.getBytes());
for (int i = 0; i < md5.length; i++) {
part = Integer.toHexString(md5[i] & 0xFF);
if (part.length() == 1) {
part = "0" + part;
}
sb.append(part);
}
} catch (NoSuchAlgorithmException ex) {
}
return sb.toString();
}
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 = "青阳县供销社九华山龙泉饭店";
String key = "czgjj";
String afStr = Authcode3.authcodeEncode(test, key);
System.out.println("--------encode:" + afStr);
String deStr = Authcode3.authcodeDecode(afStr, key);
System.out.println("--------decode:" + deStr);
String deStr1 = Authcode3.authcodeDecode("HeGUeCVbBYBdVwK9aSGwi0b1B2sfdClZSpjR", "czyb");
System.out.println("--------decode:" + deStr1);
}
}
🐶 你走，我不送你。你来，风雨无阻，我去接你。