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- <?php
- namespace WeWork\Crypt;
- /**
- * 提供接收和推送给公众平台消息的加解密接口
- */
- class PrpCrypt
- {
- /**
- * @var string
- */
- public $key = null;
- /**
- * @var string
- */
- public $iv = null;
- /**
- * @param $k
- */
- public function __construct($k)
- {
- $this->key = base64_decode($k . '=');
- $this->iv = substr($this->key, 0, 16);
- }
- /**
- * 加密
- *
- * @param string $text
- * @param string $corpid
- * @return array
- */
- public function encrypt($text, $corpid)
- {
- try {
- //拼接
- $text = $this->getRandomStr() . pack('N', strlen($text)) . $text . $corpid;
- //添加PKCS#7填充
- $pkc_encoder = new PKCS7Encoder;
- $text = $pkc_encoder->encode($text);
- //加密
- $encrypted = openssl_encrypt($text, 'AES-256-CBC', $this->key, OPENSSL_ZERO_PADDING, $this->iv);
- return [ErrorCode::$OK, $encrypted];
- } catch (\Exception $e) {
- return [ErrorCode::$EncryptAESError, null];
- }
- }
- /**
- * 解密
- *
- * @param $encrypted
- * @param $corpid
- * @return array
- */
- public function decrypt($encrypted, $corpid)
- {
- try {
- //解密
- $decrypted = openssl_decrypt($encrypted, 'AES-256-CBC', $this->key, OPENSSL_ZERO_PADDING, $this->iv);
- } catch (\Exception $e) {
- return [ErrorCode::$DecryptAESError, null];
- }
- try {
- //删除PKCS#7填充
- $pkc_encoder = new PKCS7Encoder;
- $result = $pkc_encoder->decode($decrypted);
- if (strlen($result) < 16) {
- return [];
- }
- //拆分
- $content = substr($result, 16, strlen($result));
- $len_list = unpack('N', substr($content, 0, 4));
- $xml_len = $len_list[1];
- $xml_content = substr($content, 4, $xml_len);
- $from_corpid = substr($content, $xml_len + 4);
- } catch (\Exception $e) {
- return [ErrorCode::$IllegalBuffer, null];
- }
- if ($from_corpid != $corpid) {
- return [ErrorCode::$ValidateCorpidError, null];
- }
- return [0, $xml_content];
- }
- /**
- * 生成随机字符串
- *
- * @return string
- */
- public 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;
- }
- }
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