use openssl to replace mcrypt in php7

AesCipher.php

class AesCipher {
    /**
     * 加密密钥
     * @var string
     */
    private $key = MemberCode::MOBILE_ENCRYPT_KEY;
    /**
     * 加密算法
     * @var string
     */
    private $method = 'AES-128-ECB';

    /**
     * openssl_encrypt加密
     * 相当于
     * 将mcrypt_encrypt的加密结果
     * 再执行一次base64_encode
     * @param $encrypt
     * @param string $key
     * @return string
     */
    public function encrypt($encrypt, $key="") {
        if (empty($key)){
            $key = $this->key;
        }
        $key2 = substr(openssl_digest(openssl_digest($key, 'sha1', true), 'sha1', true), 0, 16);
        $encrypted = openssl_encrypt($encrypt, $this->method, $key2);
        return $encrypted;
    }

    /**
     * openssl_decode解密
     * 相当于
     * 先将加密结果执行一次base64_decode
     * 然后再通过mcrypt_encrypt解密
     * @param $decrypt
     * @param string $key
     * @return string
     */
    public function decrypt($decrypt, $key='') {
        if (empty($key)){
            $key = $this->key;
        }
        $key2 = substr(openssl_digest(openssl_digest($key, 'sha1', true), 'sha1', true), 0, 16);
        $decrypted = openssl_decrypt($decrypt, $this->method, $key2);
        return $decrypted;
    }
}