网上搜集的加密解密函数

Posted 2020-10-12 李照耀

看到有人写的这个代码，用来加密解密还不错，暂时收藏一下，貌似这个人挺有名气的

<?php
/**
 * MrPmvc加密解密类
 * @author 狂奔的蜗牛
 * @email  [e-mail]
 * @version alpha
 * Usage:
 *      $key = new KEY(\'adfasdfs\', 30);
        $e_txt = $key->encode(\'中文哦..aaaa\');
        echo $e_txt.\'<br/>\';
        echo $key->decode($e_txt);
 */
class KEY {
    private $expire = 0, $key = \'secret\';

    public function __construct($key_str = null, $time_to_live = null) {
        if ($key_str) {
            self::setKey($key_str);
        }
        if ($time_to_live) {
            self::setExpire($time_to_live);
        }
    }

    public  function setExpire($time_to_live) {
        $this->expire = floatval($time_to_live);
    }

    public  function setKey($key_str) {
        $this->key = (string) $key_str;
    }

    public  function encode($tex, $key = null, $expire = 0) {
        $key = $key ? $key : $this->key;
        $expire = $expire ? $expire : $this->expire;
        $chrArr = array(\'a\', \'b\', \'c\', \'d\', \'e\', \'f\', \'g\', \'h\', \'i\', \'j\', \'k\', \'l\', \'m\', \'n\', \'o\', \'p\', \'q\', \'r\', \'s\', \'t\', \'u\', \'v\', \'w\', \'x\', \'y\', \'z\',
            \'A\', \'B\', \'C\', \'D\', \'E\', \'F\', \'G\', \'H\', \'I\', \'J\', \'K\', \'L\', \'M\', \'N\', \'O\', \'P\', \'Q\', \'R\', \'S\', \'T\', \'U\', \'V\', \'W\', \'X\', \'Y\', \'Z\',
            \'0\', \'1\', \'2\', \'3\', \'4\', \'5\', \'6\', \'7\', \'8\', \'9\');
        $tex.="~#~" . sprintf(\'%010d\', $expire ? $expire + time() : 0) . "~#~";
        $key_b = $chrArr[rand() % 62] . $chrArr[rand() % 62] . $chrArr[rand() % 62] . $chrArr[rand() % 62] . $chrArr[rand() % 62] . $chrArr[rand() % 62];
        $rand_key = $key_b . $key;
        $rand_key = md5($rand_key);
        $texlen = strlen($tex);
        $reslutstr = "";
        for ($i = 0; $i < $texlen; $i++) {
            $reslutstr.=$tex{$i} ^ $rand_key{$i % 32};
        }
        $reslutstr = trim($key_b . base64_encode($reslutstr), "==");
        $reslutstr = substr(md5($reslutstr), 0, 8) . $reslutstr;
        return $reslutstr;
    }

    public  function decode($tex, $key = null) {
        $key = $key ? $key : $this->key;
        if (strlen($tex) < 14)
            return false;
        $verity_str = substr($tex, 0, 8);
        $tex = substr($tex, 8);
        if ($verity_str != substr(md5($tex), 0, 8)) {
            //完整性验证失败
            return false;
        }
        $key_b = substr($tex, 0, 6);
        $rand_key = $key_b . $key;
        $rand_key = md5($rand_key);
        $tex = base64_decode(substr($tex, 6));
        $texlen = strlen($tex);
        $reslutstr = "";
        for ($i = 0; $i < $texlen; $i++) {
            $reslutstr.=$tex{$i} ^ $rand_key{$i % 32};
        }
        $expiry_arr = array();
        preg_match(\'/^(.*)~#~(\\d{10})~#~$/\', $reslutstr, $expiry_arr);
        if (count($expiry_arr) != 3) {
            //过期时间完整性验证失败
            return false;
        } else {
            $tex_time = $expiry_arr[2];
            if ($tex_time > 0 && $tex_time - time() <= 0) {
                //验证码过期
                return false;
            } else {
                $reslutstr = $expiry_arr[1];
            }
        }
        return $reslutstr;
    }

}


$model=new KEY();
$encode_string=$model->encode("lizhaoyao");
var_dump($encode_string);
$decode_string=$model->decode("2bc35493whObs1DwhMCgJeTFgJTUVIUwgBVQYJAgYABUwVSQ");
var_dump($decode_string);

效果如图：