101 lines
1.8 KiB
PHP
101 lines
1.8 KiB
PHP
<?php
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namespace App\Classc;
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class WxBizDataCrypt
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{
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private $appid;
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private $sessionKey;
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/**
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* 构造函数
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* @param $sessionKey string 用户在小程序登录后获取的会话密钥
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* @param $appid string 小程序的appid
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*/
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public function __construct( $appid, $sessionKey)
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{
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$this->sessionKey = $sessionKey;
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$this->appid = $appid;
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}
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public function error($code)
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{
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switch ($code) {
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case 'IllegalAesKey':
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# code...
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return '-41001';
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break;
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case 'IllegalIv':
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# code...
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return '-41002';
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break;
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case 'IllegalBuffer':
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# code...
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return '-41003';
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break;
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case 'DecodeBase64Error':
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# code...
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return '-41004';
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break;
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case 'OK':
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# code...
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return '0';
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break;
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default:
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# code...
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break;
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}
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}
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/**
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* 检验数据的真实性，并且获取解密后的明文.
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* @param $encryptedData string 加密的用户数据
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* @param $iv string 与用户数据一同返回的初始向量
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* @param $data string 解密后的原文
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*
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* @return int 成功0，失败返回对应的错误码
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*/
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public function decryptData( $encryptedData, $iv, &$data )
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{
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if (strlen($this->sessionKey) != 24) {
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return $this->error('IllegalAesKey');
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}
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$aesKey=base64_decode($this->sessionKey);
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if (strlen($iv) != 24) {
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return $this->error('IllegalIv');
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}
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$aesIV=base64_decode($iv);
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$aesCipher=base64_decode($encryptedData);
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$result=openssl_decrypt( $aesCipher, "AES-128-CBC", $aesKey, 1, $aesIV);
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$dataObj=json_decode( $result );
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if( $dataObj == NULL )
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{
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return $this->error('IllegalBuffer');
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}
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if( $dataObj->watermark->appid != $this->appid )
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{
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return $this->error('IllegalBuffer');
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}
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$data = $result;
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return $this->error('OK');
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}
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}
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