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104 lines
2.6 KiB
104 lines
2.6 KiB
<?php
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namespace WeWork\Crypt;
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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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/**
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* @var string
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*/
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public $key = null;
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/**
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* @var string
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*/
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public $iv = null;
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/**
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* @param $k
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*/
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public function __construct($k)
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{
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$this->key = base64_decode($k . '=');
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$this->iv = substr($this->key, 0, 16);
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}
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/**
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* 加密
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*
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* @param string $text
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* @param string $corpid
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* @return array
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*/
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public function encrypt($text, $corpid)
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{
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try {
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//拼接
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$text = $this->getRandomStr() . pack('N', strlen($text)) . $text . $corpid;
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//添加PKCS#7填充
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$pkc_encoder = new PKCS7Encoder;
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$text = $pkc_encoder->encode($text);
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//加密
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$encrypted = openssl_encrypt($text, 'AES-256-CBC', $this->key, OPENSSL_ZERO_PADDING, $this->iv);
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return [ErrorCode::$OK, $encrypted];
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} catch (\Exception $e) {
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return [ErrorCode::$EncryptAESError, null];
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}
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}
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/**
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* 解密
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*
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* @param $encrypted
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* @param $corpid
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* @return array
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*/
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public function decrypt($encrypted, $corpid)
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{
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try {
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//解密
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$decrypted = openssl_decrypt($encrypted, 'AES-256-CBC', $this->key, OPENSSL_ZERO_PADDING, $this->iv);
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} catch (\Exception $e) {
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return [ErrorCode::$DecryptAESError, null];
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}
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try {
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//删除PKCS#7填充
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$pkc_encoder = new PKCS7Encoder;
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$result = $pkc_encoder->decode($decrypted);
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if (strlen($result) < 16) {
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return [];
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}
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//拆分
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$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_corpid = substr($content, $xml_len + 4);
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} catch (\Exception $e) {
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return [ErrorCode::$IllegalBuffer, null];
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}
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if ($from_corpid != $corpid) {
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return [ErrorCode::$ValidateCorpidError, null];
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}
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return [0, $xml_content];
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}
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/**
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* 生成随机字符串
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*
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* @return string
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*/
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public function getRandomStr()
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{
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$str = '';
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$str_pol = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyl';
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$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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