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Prettify hash_equals.

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This commit is contained in:
Jean Paul Galea 2015-07-16 22:19:47 +02:00
parent 0d03c2be29
commit 6c0b62f77e
1 changed files with 16 additions and 12 deletions

28
ykval-common.php

@ -270,17 +270,21 @@ function sendResp($status, $logger, $apiKey = '', $extra = null) {
echo $str;
}
// hash_equals is introduced in PHP 5.6
if(!function_exists('hash_equals')) {
function hash_equals($a, $b) {
if(strlen($a) != strlen($b)) { //Hashes are a (known) fixed length, so this doesn't leak anything.
return false;
}
// backport from PHP 5.6
if (function_exists('hash_equals') === FALSE)
{
function hash_equals($a, $b)
{
// hashes are a (known) fixed length,
// so this doesn't leak anything.
if (strlen($a) != strlen($b))
return false;
$result = 0;
for ($i = 0; $i < strlen($a); $i++) {
$result |= ord($a[$i]) ^ ord($b[$i]);
}
return 0 === $result;
}
$result = 0;
for ($i = 0; $i < strlen($a); $i++)
$result |= ord($a[$i]) ^ ord($b[$i]);
return (0 === $result);
}
}