guochanhua/server/application/common/library/Gm.php

<?php

namespace app\common\library;

use think\facade\Config;

/**
 * 国密加密
 */
class Gm
{

    /*
     * 国密4加密
     * str 加密字符串
     */
    public static function encrypt($key, $str)
    {
        // $key = Config::get('gm.key');
        if($str) {
            $iv = str_repeat("\0", openssl_cipher_iv_length('SM4-CBC'));
            $ciphertext = openssl_encrypt($str, 'SM4-CBC', $key, OPENSSL_RAW_DATA, $iv);
            return base64_encode($ciphertext);
        }
        return $str;
        
    }

    /*
     * 国密4解密
     * str 解密字符串
     */
    public static function decrypt($key, $str)
    {
        if($str) {
            $iv = str_repeat("\0", openssl_cipher_iv_length('SM4-CBC'));
            return openssl_decrypt(base64_decode($str), 'SM4-CBC', $key, OPENSSL_RAW_DATA, $iv);
        }
        return $str;
    }
}