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|
<?php
//
// Reference
// https://github.com/TecharoHQ/anubis/blob/ecc716940e34ebe7249974f2789a99a2c7115e4e/web/js/proof-of-work.mjs
//
class anubis{
public function __construct(){
include_once "fuckhtml.php";
$this->fuckhtml = new fuckhtml();
}
public function scrape($html){
$this->fuckhtml->load($html);
$script =
$this->fuckhtml
->getElementById(
"anubis_challenge",
"script"
);
if($script === false){
throw new Exception("Failed to scrape anubis challenge data");
}
$script =
json_decode(
$this->fuckhtml
->getTextContent(
$script
),
true
);
if($script === null){
throw new Exception("Failed to decode anubis challenge data");
}
if(
!isset($script["challenge"]) ||
!isset($script["rules"]["difficulty"]) ||
!is_int($script["rules"]["difficulty"]) ||
!is_string($script["challenge"])
){
throw new Exception("Found invalid challenge data");
}
return $this->rape($script["challenge"], $script["rules"]["difficulty"]);
}
private function is_valid_hash($hash, $difficulty){
for ($i=0; $i<$difficulty; $i++) {
$index = (int)floor($i / 2);
$nibble = $i % 2;
$byte = ord($hash[$index]);
$nibble = ($byte >> ($nibble === 0 ? 4 : 0)) & 0x0f;
if($nibble !== 0){
return false;
}
}
return true;
}
public function rape($data, $difficulty = 5){
$nonce = 0;
while(true){
$hash_binary = hash("sha256", $data . $nonce, true);
if($this->is_valid_hash($hash_binary, $difficulty)){
$hash_hex = bin2hex($hash_binary);
return [
"response" => $hash_hex,
//"data" => $data,
//"difficulty" => $difficulty,
"nonce" => $nonce
];
}
$nonce++;
}
}
}
|
