first commit

2025-11-28 10:08:12 +08:00
commit 09a14bf0a3
1088 changed files with 145132 additions and 0 deletions
@@ -0,0 +1,77 @@
+<?php
+namespace lib\wechat;
+
+class WechatCrypt
+{
+    private $key;
+    private $iv;
+    private static $block_size = 32;
+
+    public function __construct($enckey)
+    {
+        $this->key = base64_decode($enckey . '=');
+        $this->iv = substr($this->key, 0, 16);
+    }
+
+    public function encrypt($data, $appid)
+    {
+        $str = $this->getRandomStr() . pack('N', strlen($data)) . $data . $appid;
+        $str = $this->enPKSC7($str);
+        $encrypted = openssl_encrypt($str, 'AES-256-CBC', $this->key, OPENSSL_ZERO_PADDING, $this->iv);
+        return $encrypted;
+    }
+
+    public function decrypt($data)
+    {
+        $decrypted = openssl_decrypt($data, 'AES-256-CBC', $this->key, OPENSSL_ZERO_PADDING, $this->iv);
+        if(!$decrypted) return false;
+        $decrypted = $this->dePKSC7($decrypted);
+
+        $content = substr($decrypted, 16, strlen($decrypted));
+        $len_list = unpack('N', substr($content, 0, 4));
+        $xml_len = $len_list[1];
+        $xml_content = substr($content, 4, $xml_len);
+        $from_appid = substr($content, $xml_len + 4);
+
+        return $xml_content;
+    }
+
+    private function enPKSC7($text)
+    {
+        $block_size = self::$block_size; //128:16、256:32
+        $text_length = strlen($text);
+        //计算需要填充的位数
+        $amount_to_pad = $block_size - ($text_length % $block_size);
+        if ($amount_to_pad == 0) {
+            $amount_to_pad = $block_size;
+        }
+        //获得补位所用的字符
+        $pad_chr = chr($amount_to_pad);
+        $tmp = "";
+        for ($index = 0; $index < $amount_to_pad; $index++) {
+            $tmp .= $pad_chr;
+        }
+        return $text . $tmp;
+    }
+    
+    private function dePKSC7($text)
+    {
+        $block_size = self::$block_size; //128:16、256:32
+        $pad = ord(substr($text, -1));
+        if ($pad < 1 || $pad > $block_size) {
+            $pad = 0;
+        }
+        return substr($text, 0, (strlen($text) - $pad));
+    }
+
+    private function getRandomStr()
+    {
+        $str = '';
+        $str_pol = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyl';
+        $max = strlen($str_pol) - 1;
+        for ($i = 0; $i < 16; $i++) {
+            $str .= $str_pol[mt_rand(0, $max)];
+        }
+        return $str;
+    }
+}