PHP7.2中AES加密解密方法mcrypt_module_open()替换方案 Function mcrypt_get_block_size() is deprecated

直接粘代码，该类是基于微信公众号消息加密解密所提供的PHP DEMO改造而来，目前使用于彬彬大学APP接口token校验中。

php的mcrypt 扩展已经过时了大约10年，并且用起来很复杂。因此它被废弃并且被 OpenSSL 所取代。 从PHP 7.2起它将被从核心代码中移除并且移到PECL中。PHP手册在7.1迁移页面给出了替代方案,就是用OpenSSL取代MCrypt.

class Aes {

    private $hex_iv = '00000000000000000000000000000000'; # converted JAVA byte code in to HEX and placed it here

    private $key = '397e2eb61307109f6e68006ebcb62f98'; #Same as in JAVA

    function __construct($key) {
        $this->key = $key;
        $this->key = hash('sha256', $this->key, true);
    }

    /*
    function encrypt($str) {
        $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
        mcrypt_generic_init($td, $this->key, $this->hexToStr($this->hex_iv));
        $block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
        $pad = $block - (strlen($str) % $block);
        $str .= str_repeat(chr($pad), $pad);
        $encrypted = mcrypt_generic($td, $str);
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);
        return base64_encode($encrypted);
    }
    function decrypt($code) {
        $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
        mcrypt_generic_init($td, $this->key, $this->hexToStr($this->hex_iv));
        $str = mdecrypt_generic($td, base64_decode($code));
        $block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);
        return $this->strippadding($str);
    }*/

    public function encrypt($input)
    {
        $data = openssl_encrypt($input, 'AES-256-CBC', $this->key, OPENSSL_RAW_DATA, $this->hexToStr($this->hex_iv));
        $data = base64_encode($data);
        return $data;
    }

    public function decrypt($input)
    {
        $decrypted = openssl_decrypt(base64_decode($input), 'AES-256-CBC', $this->key, OPENSSL_RAW_DATA, $this->hexToStr($this->hex_iv));
        return $decrypted;
    }

    /*
      For PKCS7 padding
     */

    private function addpadding($string, $blocksize = 16) {

        $len = strlen($string);

        $pad = $blocksize - ($len % $blocksize);

        $string .= str_repeat(chr($pad), $pad);

        return $string;

    }

    private function strippadding($string) {

        $slast = ord(substr($string, -1));

        $slastc = chr($slast);

        $pcheck = substr($string, -$slast);

        if (preg_match("/$slastc{" . $slast . "}/", $string)) {

            $string = substr($string, 0, strlen($string) - $slast);

            return $string;

        } else {

            return false;

        }

    }

    function hexToStr($hex)
    {

        $string='';

        for ($i=0; $i < strlen($hex)-1; $i+=2)

        {

            $string .= chr(hexdec($hex[$i].$hex[$i+1]));

        }

        return $string;
    }

}

    /**
     * @param array $data
     * 生成每次请求的sign 加密信息
     * @return string
     * Author: yehui
     * Date: 2019/11/19 23:33
     */
        public static function setSign($data = []){
            // 1 按字段排序
            ksort($data);
            // 2 拼接字符串数据 &

            //$data = array('foo'=>'bar', 
            //              'baz'=>'boom',  
            //              'php'=>'hypertext processor'); 
            //echo http_build_query($data); 
            ///* 输出： 
            //       foo=bar&baz=boom&php=hypertext+processor 
            //*/ 

            $string = http_build_query($data); //http_build_query — 生成 URL-encode 之后的请求字符串
            // 3 通过aes加密
            $aes = new Aes(config('app.aeskey'));
            $string = $aes->encrypt($string);
            // 4 最终返回加密的数据
            return $string;
        }

public function testAes(){
    $data = [
        'name'=>'yh',
        'age'=>12,
    ];
    $str = '05rIEfJkLlXQpjuUgxFgMw=='; //加密后的数据
    //echo IAuth::setSign($data);//05rIEfJkLlXQpjuUgxFgMw== 加密后的数据
    $aes = new Aes(config('app.aeskey'));
    echo $aes->decrypt('05rIEfJkLlXQpjuUgxFgMw==');//age=12&name=yh 解密后的数据
}