authcode func & readme & composer

Author: wilon

Authcode.php

@@ -0,0 +1,123 @@
+<?php
+
+namespace Authcode;
+
+class Authcode
+{
+    /**
+     * The authcode key.
+     *
+     * @var string
+     */
+    protected $key;
+
+    /**
+     * Create a new authcode instance.
+     *
+     * @param  string  $key
+     * @return void
+     *
+     * @throws \RuntimeException
+     */
+    public function __construct($key)
+    {
+        $this->key = $key;
+    }
+
+    /**
+     * Encode the given value.
+     *
+     * @param  string  $value
+     * @param  bool  $serialize
+     * @return string
+     *
+     * @throws \Illuminate\Contracts\Encryption\EncryptException
+     */
+    public function encode($value, $expiry = 0)
+    {
+        $this->authcode($value, 'ENCODE', $this->key, $expiry);
+    }
+
+    /**
+     * Decode the given value.
+     *
+     * @param  string  $value
+     * @param  bool  $serialize
+     * @return string
+     *
+     */
+    public function decode($value, $expiry = 0)
+    {
+        $this->authcode($value, 'DECODE', $this->key, $expiry);
+    }
+
+    /**
+     * Authcode function, from discuz source.
+     *
+     * @param  string  $string
+     * @param  string  $operation
+     * @param  string  $key
+     * @param  integer  $expiry
+     * @return string
+     */
+    protected function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0)
+    {
+
+        $ckey_length = 4;
+
+        $key = md5($key ? $key : UC_KEY);
+        $keya = md5(substr($key, 0, 16));
+        $keyb = md5(substr($key, 16, 16));
+        $keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : '';
+
+        $cryptkey = $keya.md5($keya.$keyc);
+        $key_length = strlen($cryptkey);
+
+        $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);
+
+        $rndkey = array();
+        for($i = 0; $i <= 255; $i++) {
+            $rndkey[$i] = ord($cryptkey[$i % $key_length]);
+        }
+
+        for($j = $i = 0; $i < 256; $i++) {
+            $j = ($j + $box[$i] + $rndkey[$i]) % 256;
+            $tmp = $box[$i];
+            $box[$i] = $box[$j];
+            $box[$j] = $tmp;
+        }
+
+        for($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;
+            $result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
+        }
+
+        if($operation == 'DECODE') {
+            if((substr($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 {
+            return $keyc.str_replace('=', '', base64_encode($result));
+        }
+    }
+
+    /**
+     * Get the authcode key.
+     *
+     * @return string
+     */
+    public function getKey()
+    {
+        return $this->key;
+    }
+}

README.md

@@ -1,2 +1,16 @@
-# authcode
-PHP authcode function. From discuz.
+# Authcode
+PHP string encrypt and decode function. From discuz.
+
+## Installation & loading
+
+Just add this line to your `composer.json` file:
+
+```json
+"wilon/authcode": "~5.2"
+```
+
+or
+
+```sh
+composer require wilon/authcode
+```

composer.json

@@ -0,0 +1,29 @@
+{
+    "name": "wilon/authcode",
+    "description": "Ecode and decode string.",
+    "license": "MIT",
+    "homepage": "https://wilon.github.io",
+    "support": {
+        "issues": "https://github.com/wilon/authcode/issues",
+        "source": "https://github.com/wilon/authcode"
+    },
+    "keywords": ["encrypt", "decode"],
+    "authors": [
+        {
+            "name": "Weilong Wang",
+            "email": "wilonx@163.com"
+        }
+    ],
+    "require": {
+        "php": ">=5.2"
+    },
+    "autoload": {
+        "psr-4": {
+            "Authcode\\": ""
+        }
+    },
+    "config": {
+        "sort-packages": true
+    },
+    "minimum-stability": "dev"
+}