/**
* Execute a block of code.
*
* @param string $code
* @param boolean $cache
* @param boolean $do_not_eval
* @return mixed
*/
protected static function coreEval(string $code, bool $cache = false, bool $do_not_eval = false)
{
\clearstatcache();
if ($do_not_eval || \Airship\is_disabled('eval')) {
if ($cache) {
if (!\file_exists(ROOT . "/tmp/cache/gear")) {
\mkdir(ROOT . "/tmp/cache/gear", 0777);
\clearstatcache();
}
$hashed = Base64UrlSafe::encode(CryptoUtil::raw_hash($code, 33));
if (!\file_exists(ROOT . '/tmp/cache/gear/' . $hashed . '.tmp.php')) {
\file_put_contents(ROOT . '/tmp/cache/gear/' . $hashed . '.tmp.php', '<?php' . "\n" . $code);
}
return self::sandboxRequire(ROOT . '/cache/' . $hashed . '.tmp.php');
} else {
if (!\file_exists(ROOT . '/tmp/gear')) {
\mkdir(ROOT . '/tmp/gear', 0777);
\clearstatcache();
}
$file = \Airship\tempnam('gear-', 'php', ROOT . '/tmp/gear');
\file_put_contents($file, '<?php' . "\n" . $code);
\clearstatcache();
$ret = self::sandboxRequire($file);
\unlink($file);
\clearstatcache();
return $ret;
}
} else {
return eval($code);
}
}
/**
* Calculate the Merkle root, taking care to distinguish between
* leaves and branches (0x01 for the nodes, 0x00 for the branches)
* to protect against second-preimage attacks
*
* @return string
*/
protected function calculateRoot() : string
{
$size = \count($this->nodes);
if ($size < 1) {
return '';
}
$hash = [];
// Population (Use self::MERKLE_LEAF as a prefix)
for ($i = 0; $i < $size; ++$i) {
$hash[$i] = self::MERKLE_LEAF . $this->personalization . $this->nodes[$i]->getHash(true, $this->outputSize, $this->personalization);
}
// Calculation (Use self::MERKLE_BRANCH as a prefix)
do {
$tmp = [];
$j = 0;
for ($i = 0; $i < $size; $i += 2) {
if (empty($hash[$i + 1])) {
$tmp[$j] = $hash[$i];
} else {
$tmp[$j] = Util::raw_hash(self::MERKLE_BRANCH . $this->personalization . $hash[$i] . $hash[$i + 1], $this->outputSize);
}
++$j;
}
$hash = $tmp;
$size >>= 1;
} while ($size > 1);
// We should only have one value left:
$this->rootCalculated = true;
return \array_shift($hash);
}
/**
* Get a hash of the data (defaults to hex encoded)
*
* @param bool $raw
*
* These two aren't really meant to be used externally:
* @param int $outputSize
* @param string $personalization
*
* @return string
*/
public function getHash(bool $raw = false, int $outputSize = \Sodium\CRYPTO_GENERICHASH_BYTES, string $personalization = '') : string
{
if ($raw) {
return Util::raw_hash($personalization . $this->data, $outputSize);
}
return Util::hash($personalization . $this->data, $outputSize);
}
/**
* @covers File::checksum()
*/
public function testChecksum()
{
$csum = File::checksum(__DIR__ . '/tmp/paragon_avatar.png', null, false);
$this->assertSame($csum, "09f9f74a0e742d057ca08394db4c2e444be88c0c94fe9a914c3d3758c7eccafb" . "8dd286e3d6bc37f353e76c0c5aa2036d978ca28ffaccfa59f5dc1f076c5517a0");
$data = \Sodium\randombytes_buf(32);
\file_put_contents(__DIR__ . '/tmp/garbage.dat', $data);
$hash = Util::raw_hash($data, 64);
$file = File::checksum(__DIR__ . '/tmp/garbage.dat', null, true);
$this->assertSame($hash, $file);
\unlink(__DIR__ . '/tmp/garbage.dat');
}
