码上爬 第6题

<?php
/**
 * 将字符串按小端序拆分为 32 位无符号整数数组
 *
 * @param string $str 输入字符串
 * @return array<int>  32 位无符号整数数组
 */
function strToUint32Array(string $str): array
{
    $bytes   = strlen($str);          // 字节数
    $words   = (int) ceil($bytes / 4); // 所需的 32 位整数个数
    $result  = array_fill(0, $words, 0);

    for ($i = 0; $i < $bytes; $i++) {
        $byte      = ord($str[$i]) & 0xFF; // 取低 8 位
        $wordIndex = (int) ($i / 4);       // 第几个 32 位整数
        $shift     = ($i % 4) * 8;         // 小端序位移
        $result[$wordIndex] |= $byte << $shift;
    }

    return $result;
}

/* === 演示 === */
$arr = strToUint32Array('sssssbbbbb1753874610182');
print_r($arr);   // 输出：Array ( [0] => 6513249 )

exit;



$key = 'jo8j9wGw%6HbxfFn';
$iv = '0123456789ABCDEF';
$data = '{page: 1, _ts: 1753795557201}';
$cipher = "AES-128-CBC";
$options = 1;


class AES {
    protected $method;
    protected $secret_key;
    protected $iv;
    protected $options;

    public function __construct($key, $method = 'AES-128-CBC', $iv = '', $options = 0) {
        $this->secret_key = isset($key) ? $key : exit('key为必须项');
        $this->method = $method;
        $this->iv = $iv;
        $this->options = $options;
    }

    public function encrypt($data) {
    return openssl_encrypt($data, $this->method, $this->secret_key, $this->options, $this->iv);
    }

    public function decrypt($data) {
    return openssl_decrypt($data, $this->method, $this->secret_key, $this->options, $this->iv);
    }
}



$aes = new AES($key, 'AES-128-CBC', $iv);
$encrypted = $aes->encrypt($data);
echo "加密后的数据: " . hexdec($encrypted) . PHP_EOL;

$decrypted = $aes->decrypt($encrypted);
echo "解密后的数据: " . $decrypted . PHP_EOL;








//$encrypted = openssl_encrypt(base64_encode($data), $cipher, $key, $options, substr($iv, 0, 16));
//$encrypted = openssl_encrypt($data, $cipher, $key, $options, substr($iv, 0, 16));

$encrypted = openssl_encrypt($data, $cipher, $key, 1, $iv);
echo OPENSSL_RAW_DATA;
echo $encrypted;exit;




$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/4/';

$sums = 0;
for ($i=1;$i<=20;$i++){
    $page = $i;
    $time = get_total_millisecond();
    $sign = md5("tuling{$time}{$page}");

    $url = "https://mashangpa.com/api/problem-detail/4/data/?page={$page}&sign={$sign}&_ts={$time}";
    //echo $url;echo PHP_EOL;

    $code = get_curl_contents($url,$headers);
    $json = json_decode($code,true);
    //var_dump($json);
    $sum = 0;
    foreach($json['current_array'] as $v){
        $sum +=$v;
    }
    $sums += $sum;
}
echo $sums;



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);
}