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