<?php
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declare(strict_types=1);
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/*
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* This file is part of the EasyWeChatComposer.
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*
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* (c) 张铭阳 <mingyoungcheung@gmail.com>
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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 EasyWeChatComposer\Encryption;
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use EasyWeChatComposer\Contracts\Encrypter;
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use EasyWeChatComposer\Exceptions\DecryptException;
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use EasyWeChatComposer\Exceptions\EncryptException;
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class DefaultEncrypter implements Encrypter
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{
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/**
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* @var string
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*/
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protected $key;
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/**
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* @var string
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*/
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protected $cipher;
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/**
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* @param string $key
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* @param string $cipher
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*/
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public function __construct($key, $cipher = 'AES-256-CBC')
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{
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$this->key = $key;
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$this->cipher = $cipher;
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}
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/**
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* Encrypt the given value.
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*
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* @param string $value
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*
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* @return string
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*
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* @throws \EasyWeChatComposer\Exceptions\EncryptException
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*/
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public function encrypt($value)
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{
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$iv = random_bytes(openssl_cipher_iv_length($this->cipher));
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$value = openssl_encrypt($value, $this->cipher, $this->key, 0, $iv);
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if ($value === false) {
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throw new EncryptException('Could not encrypt the data.');
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}
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$iv = base64_encode($iv);
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return base64_encode(json_encode(compact('iv', 'value')));
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}
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/**
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* Decrypt the given value.
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*
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* @param string $payload
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*
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* @return string
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*
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* @throws \EasyWeChatComposer\Exceptions\DecryptException
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*/
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public function decrypt($payload)
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{
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$payload = json_decode(base64_decode($payload), true);
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$iv = base64_decode($payload['iv']);
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$decrypted = openssl_decrypt($payload['value'], $this->cipher, $this->key, 0, $iv);
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if ($decrypted === false) {
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throw new DecryptException('Could not decrypt the data.');
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}
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return $decrypted;
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}
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}
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