码上爬 第7题

  <?php


$sums = 0;
for ($i=1;$i<=20;$i++){
    $headers = null;
    $page = $i;
    $time = get_total_millisecond();
    
    $str = 'xialuo'.$time;
    $md5 = md5($str);
    $x = hash('sha256', $md5.'xxoo');
    
    $headers[] = 'Cookie:Hm_lvt_0d2227abf9548feda3b9cb6fddee26c0=1753794156; HMACCOUNT=8CFCE68853DBDF9C; sessionid=acnti2em752v7l48qa9av21r69td509r; Hm_lpvt_0d2227abf9548feda3b9cb6fddee26c0=1753794360';
    $headers[] = 'User-Agent:Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36 Edg/123.0.0.0';
    $headers[] = 'Referer:https://mashangpa.com/problem-detail/7/';
    $headers[] = "m:{$md5}";
    $headers[] = "ts:{$time}";
    
    $url = "https://mashangpa.com/api/problem-detail/7/data/?page={$page}&x={$x}";
    $code = get_curl_contents($url,$headers);
    $json = json_decode($code,true);
    $code = decrypt($json['r']);
    $json = json_decode($code,true);
    //var_dump($json);exit;
    $sum = 0;
    foreach($json['current_array'] as $v){
        $sum +=$v;
    }
    $sums += $sum;
}
echo $sums;


function decrypt($hexCiphertext){
    $hexKey = '78787878787878786f6f6f6f6f6f6f6f';   // 16 字节
    $hexIV  = '30313233343536373839414243444546'; // 16 字节

    // 1. 把十六进制转成二进制
    $ciphertext = hex2bin($hexCiphertext);
    $key        = hex2bin($hexKey);
    $iv         = hex2bin($hexIV);

    // 2. 解密
    $plaintext = openssl_decrypt(
        $ciphertext,
        'AES-128-CBC',
        $key,
        OPENSSL_RAW_DATA | OPENSSL_NO_PADDING,  // 保持原始填充
        $iv
    );

    // 3. 去掉 PKCS#7 填充
    $pad = ord($plaintext[strlen($plaintext) - 1]);
    $plaintext = substr($plaintext, 0, -$pad);

    return $plaintext;

}



function get_curl_contents($bstrURL, $headers = null, $post = null) {
    $ch = curl_init($bstrURL);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    if ($headers) {
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    }
    if ($post) {
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
    }
    $data = curl_exec($ch);
    // 关闭CURL会话
    curl_close($ch);
    return $data;
}


function get_total_millisecond() {
    $time = explode(" ", microtime());
    $time = ($time[1] + $time[0]) * 1000;
    $time = round($time) . '';
    return $time;
}

function padPkcs7($data, $blocksize = 16){
    $pad = $blocksize - (strlen($data) % $blocksize);
    return $data . str_repeat(chr($pad), $pad);
}