136 lines
3.0 KiB
PHP
136 lines
3.0 KiB
PHP
<?php
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/*
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* This file is part of the overtrue/wechat.
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*
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* (c) overtrue <i@overtrue.me>
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*
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* This source file is subject to the MIT license that is bundled
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* with this source code in the file LICENSE.
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*/
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namespace douyin;
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use app\common\exception\Exception;
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use douyin\AES;
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/**
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* Class Encryptor.
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*
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* @author mingyoung <mingyoungcheung@gmail.com>
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*/
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class Encryptor
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{
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/**
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* Decrypt data.
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*
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* @param string $sessionKey
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* @param string $iv
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* @param string $encrypted
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*
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* @return array
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*/
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public function decryptData(string $sessionKey, string $iv, string $encrypted): array
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{
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$decrypted = AES::decrypt(
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base64_decode($encrypted, false), base64_decode($sessionKey, false), base64_decode($iv, false)
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);
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$decrypted = json_decode($this->pkcs7Unpad($decrypted), true);
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if (!$decrypted) {
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throw new Exception('The given payload is invalid.');
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}
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return $decrypted;
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}
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const ERROR_INVALID_SIGNATURE = -40001; // Signature verification failed
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const ERROR_CALC_SIGNATURE = -40003; // Calculating the signature failed
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const ERROR_INVALID_AES_KEY = -40004; // Invalid AESKey
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const ERROR_INVALID_APP_ID = -40005; // Check AppID failed
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const ERROR_ENCRYPT_AES = -40006; // AES EncryptionInterface failed
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const ERROR_DECRYPT_AES = -40007; // AES decryption failed
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const ERROR_BASE64_ENCODE = -40009; // Base64 encoding failed
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const ERROR_BASE64_DECODE = -40010; // Base64 decoding failed
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const ILLEGAL_BUFFER = -41003; // Illegal buffer
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/**
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* @var string
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*/
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protected $aesKey;
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/**
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* Block size.
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*
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* @var int
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*/
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protected $blockSize = 32;
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/**
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* Constructor.
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*
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* @param string $appId
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* @param string|null $token
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* @param string|null $aesKey
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*/
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public function __construct(string $aesKey = null)
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{
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$this->aesKey = base64_decode($aesKey.'=', true);
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}
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/**
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* Get SHA1.
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*
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* @return string
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*
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* @throws self
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*/
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public function signature(): string
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{
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$array = func_get_args();
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sort($array, SORT_STRING);
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return sha1(implode($array));
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}
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/**
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* PKCS#7 pad.
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*
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* @param string $text
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* @param int $blockSize
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*
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* @return string
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*
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*/
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public function pkcs7Pad($text, $blockSize)
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{
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if ($blockSize > 256) {
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throw new Exception('$blockSize may not be more than 256');
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}
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$padding = $blockSize - (strlen($text) % $blockSize);
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$pattern = chr($padding);
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return $text.str_repeat($pattern, $padding);
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}
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/**
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* PKCS#7 unpad.
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*
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* @param string $text
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*
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* @return string
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*/
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public function pkcs7Unpad($text)
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{
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$pad = ord(substr($text, -1));
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if ($pad < 1 || $pad > $this->blockSize) {
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$pad = 0;
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}
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return substr($text, 0, (strlen($text) - $pad));
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}
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}
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