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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Polyfill\Php55;
/**
* @internal
*/
final class Php55
{
public static function boolval($val)
{
return (bool) $val;
}
public static function json_last_error_msg()
{
switch (json_last_error()) {
case JSON_ERROR_NONE: return 'No error';
case JSON_ERROR_DEPTH: return 'Maximum stack depth exceeded';
case JSON_ERROR_STATE_MISMATCH: return 'State mismatch (invalid or malformed JSON)';
case JSON_ERROR_CTRL_CHAR: return 'Control character error, possibly incorrectly encoded';
case JSON_ERROR_SYNTAX: return 'Syntax error';
case JSON_ERROR_UTF8: return 'Malformed UTF-8 characters, possibly incorrectly encoded';
default: return 'Unknown error';
}
}
/**
* @author Sebastiaan Stok <s.stok@rollerscapes.net>
*/
public static function hash_pbkdf2($algorithm, $password, $salt, $iterations, $length = 0, $rawOutput = false)
{
// Number of blocks needed to create the derived key
$blocks = ceil($length / strlen(hash($algorithm, null, true)));
$digest = '';
for ($i = 1; $i <= $blocks; ++$i) {
$ib = $block = hash_hmac($algorithm, $salt.pack('N', $i), $password, true);
// Iterations
for ($j = 1; $j < $iterations; ++$j) {
$ib ^= ($block = hash_hmac($algorithm, $block, $password, true));
}
$digest .= $ib;
}
if (!$rawOutput) {
$digest = bin2hex($digest);
}
return substr($digest, 0, $length);
}
}