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99 lines
3.0 KiB
99 lines
3.0 KiB
<?php
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namespace crypt;
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/**
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* Prpcrypt class
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*
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* 提供接收和推送给公众平台消息的加解密接口.
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*/
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class Prpcrypt
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{
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public $key;
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function __construct($k)
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{
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$this->key = base64_decode($k . "=");
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}
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/**
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* 对明文进行加密
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* @param string $text 需要加密的明文
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* @return string 加密后的密文
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*/
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public function encrypt($text, $appid)
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{
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try {
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//获得16位随机字符串，填充到明文之前
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$random = $this->getRandomStr();//"aaaabbbbccccdddd";
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$text = $random . pack("N", strlen($text)) . $text . $appid;
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$iv = substr($this->key, 0, 16);
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$pkc_encoder = new PKCS7Encoder;
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$text = $pkc_encoder->encode($text);
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$encrypted = openssl_encrypt($text,'AES-256-CBC',substr($this->key, 0, 32),OPENSSL_ZERO_PADDING,$iv);
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return array(ErrorCode::$OK, $encrypted);
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} catch (\Exception $e) {
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//print $e;
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return array(ErrorCode::$EncryptAESError, null);
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}
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}
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/**
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* 对密文进行解密
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* @param string $encrypted 需要解密的密文
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* @return string 解密得到的明文
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*/
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public function decrypt($encrypted, $appid)
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{
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try {
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$iv = substr($this->key, 0, 16);
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$decrypted = openssl_decrypt($encrypted,'AES-256-CBC',substr($this->key, 0, 32),OPENSSL_ZERO_PADDING,$iv);
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} catch (\Exception $e) {
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return array(ErrorCode::$DecryptAESError, null);
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}
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try {
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//去除补位字符
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$pkc_encoder = new PKCS7Encoder;
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$result = $pkc_encoder->decode($decrypted);
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//去除16位随机字符串,网络字节序和AppId
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if (strlen($result) < 16)
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return "";
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$content = substr($result, 16, strlen($result));
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$len_list = unpack("N", substr($content, 0, 4));
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$xml_len = $len_list[1];
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$xml_content = substr($content, 4, $xml_len);
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$from_appid = substr($content, $xml_len + 4);
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if (!$appid)
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$appid = $from_appid;
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//如果传入的appid是空的，则认为是订阅号，使用数据中提取出来的appid
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} catch (\Exception $e) {
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//print $e;
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return array(ErrorCode::$IllegalBuffer, null);
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}
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if ($from_appid != $appid)
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return array(ErrorCode::$ValidateAppidError, null);
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//不注释上边两行，避免传入appid是错误的情况
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return array(0, $xml_content, $from_appid);
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//增加appid，为了解决后面加密回复消息的时候没有appid的订阅号会无法回复
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}
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/**
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* 随机生成16位字符串
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* @return string 生成的字符串
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*/
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function getRandomStr()
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{
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$str = "";
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$str_pol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
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$max = strlen($str_pol) - 1;
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for ($i = 0; $i < 16; $i++) {
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$str .= $str_pol[mt_rand(0, $max)];
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}
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return $str;
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}
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}
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