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Create a hash_pbkdf2 function if it doesn't exist yet

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Mark Schouten 2014-11-05 09:33:42 +01:00
parent a2315bdaa4
commit f7cdad0b78
1 changed files with 86 additions and 0 deletions
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86
includes/misc.inc.php
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@ -176,4 +176,90 @@ function user_template_names() {
return $templatenames;
}
/* This function was taken from https://gist.github.com/rsky/5104756 to make
it available on older php versions. Thanks! */
if (!function_exists(hash_pbkdf2)) {
function hash_pbkdf2($algo, $password, $salt, $iterations, $length = 0, $rawOutput = false) {
// check for hashing algorithm
if (!in_array(strtolower($algo), hash_algos())) {
trigger_error(sprintf(
'%s(): Unknown hashing algorithm: %s',
__FUNCTION__, $algo
), E_USER_WARNING);
return false;
}
// check for type of iterations and length
foreach (array(4 => $iterations, 5 => $length) as $index => $value) {
if (!is_numeric($value)) {
trigger_error(sprintf(
'%s() expects parameter %d to be long, %s given',
__FUNCTION__, $index, gettype($value)
), E_USER_WARNING);
return null;
}
}
// check iterations
$iterations = (int)$iterations;
if ($iterations <= 0) {
trigger_error(sprintf(
'%s(): Iterations must be a positive integer: %d',
__FUNCTION__, $iterations
), E_USER_WARNING);
return false;
}
// check length
$length = (int)$length;
if ($length < 0) {
trigger_error(sprintf(
'%s(): Iterations must be greater than or equal to 0: %d',
__FUNCTION__, $length
), E_USER_WARNING);
return false;
}
// check salt
if (strlen($salt) > PHP_INT_MAX - 4) {
trigger_error(sprintf(
'%s(): Supplied salt is too long, max of INT_MAX - 4 bytes: %d supplied',
__FUNCTION__, strlen($salt)
), E_USER_WARNING);
return false;
}
// initialize
$derivedKey = '';
$loops = 1;
if ($length > 0) {
$loops = (int)ceil($length / strlen(hash($algo, '', $rawOutput)));
}
// hash for each blocks
for ($i = 1; $i <= $loops; $i++) {
$digest = hash_hmac($algo, $salt . pack('N', $i), $password, true);
$block = $digest;
for ($j = 1; $j < $iterations; $j++) {
$digest = hash_hmac($algo, $digest, $password, true);
$block ^= $digest;
}
$derivedKey .= $block;
}
if (!$rawOutput) {
$derivedKey = bin2hex($derivedKey);
}
if ($length > 0) {
return substr($derivedKey, 0, $length);
}
return $derivedKey;
}
}
?>