AES加解密算法

<?php
/**
 * Desc: Aes 加解密 php7.1+
 * Class: Aes
 * Package: app\common\lib
 * User: manzb
 * Date: 2018/10/18 17:30
 */

namespace app\common\lib;

class Aes
{
    private $iv = '';
    private $key = '';
    private $method = '';

    function __construct ()
    {
        $aes = config('admin.aes');
        /**
         * $aes 内容
            'aes' => [
                'key' => '309w4wb42104160d2g6806lv1ki60f98',//aes加密盐
                'method' => 'AES-256-CBC',//加密方式
                'hex' => '00000000000000000000000000000000',//生成iv参数用,貌似是为了安卓ios相互兼容取的这个值
            ],
           可根据每个用户账号的不同设置不同的key字段
         */
        $this->method = $aes['method'];
        $this->key = hash('sha256', $aes['key'], true);
        $this->iv = $this->hex2iv($aes['hex']);
    }

    /**
     * 加密
     * @param $str
     * @return string
     */
    public function encrypt ($str)
    {
        $encrypt = openssl_encrypt($str, $this->method, $this->key, OPENSSL_RAW_DATA, $this->iv);
        return base64_encode($encrypt);
    }

    /**
     * 解密
     * @param $str
     * @return string
     */
    public function decrypt ($str)
    {
        $decrypted = openssl_decrypt(base64_decode($str), $this->method, $this->key, OPENSSL_RAW_DATA, $this->iv);
        return $decrypted;
    }

    /**
     * 生成iv参数
     * @param $hex
     * @return string
     */
    private function hex2iv ($hex)
    {
        $iv = '';
        for ($i = 0; $i < strlen($hex) - 1; $i += 2) {
            $iv .= chr(hexdec($hex[$i] . $hex[$i + 1]));
        }
        return $iv;
    }
}