Oakhope\OAuth2\Client\Support\MiniProgram\MiniProgramDataCrypt

Complexity

Total Complexity

7

Size/Duplication

Total Lines	59
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	1

Importance

Changes

0

2 Methods

Rating	Name	Duplication	Size	Complexity
A	__construct()	0	5	1
B	decryptData()	0	27	6

<?php


namespace Oakhope\OAuth2\Client\Support\MiniProgram;

/**
 * 对微信小程序用户加密数据的解密
 *
 * @copyright Copyright (c) 1998-2014 Tencent Inc.
 */
class MiniProgramDataCrypt
{
    const OK = 0;
    const ILLEGAL_AES_KEY = -41001;
    const ILLEGAL_IV = -41002;
    const ILLEGAL_BUFFER = -41003;
    const DECODE_BASE64_ERROR = -41004;

    private $appid;
    private $sessionKey;

    /**
     * 构造函数
     * @param $sessionKey string 用户在小程序登录后获取的会话密钥
     * @param $appid string 小程序的appid
     */
    public function __construct($appid, $sessionKey)
    {
        $this->sessionKey = $sessionKey;
        $this->appid = $appid;
    }


    /**
     * 检验数据的真实性，并且获取解密后的明文.
     * @param $encryptedData string 加密的用户数据
     * @param $iv string 与用户数据一同返回的初始向量
     * @param $data string 解密后的原文
     *
     * @return int 成功0，失败返回对应的错误码
     */
    public function decryptData($encryptedData, $iv, &$data)
    {
        if (strlen($this->sessionKey) != 24) {
            return self::ILLEGAL_AES_KEY;
        }

        if (strlen($iv) != 24) {
            return self::ILLEGAL_IV;
        }

        $encoder = new PKCS7Encoder();
        $result = $encoder->decrypt($encryptedData, $this->sessionKey, $iv);

        if ($result[0] != 0) {
            return $result[0];
        }

        if ($result[1] == null) {
            return self::ILLEGAL_BUFFER;
        }
        if ($result[1]->watermark->appid != $this->appid) {
            return self::ILLEGAL_BUFFER;
        }
        $data = $result[1];

        return self::OK;
    }
}