static function hmacsha256($data, $key)
{
if (function_exists('hash_hmac')) {
return hash_hmac('sha256', $data, $key, true);
}
if (!class_exists('nanoSha2', false)) {
require 'nanoSha2.php';
}
$nanoSha2 = new nanoSha2();
$blocksize = 64;
if (strlen($key) > $blocksize) {
$key = pack('H*', $nanoSha2->hash($key, true));
}
$key = str_pad($key, $blocksize, chr(0x0));
$ipad = str_repeat(chr(0x36), $blocksize);
$opad = str_repeat(chr(0x5c), $blocksize);
$hmac = pack('H*', $nanoSha2->hash(($key ^ $opad) . pack('H*', $nanoSha2->hash(($key ^ $ipad) . $data, true)), true));
return $hmac;
}
/**
* Main routine called from an application using this include.
*
* General usage:
* require_once('sha256.inc.php');
* $hashstr = sha256('abc');
*
* Note:
* PHP Strings are limitd to (2^31)-1, so it is not worth it to
* check for input strings > 2^64 as the FIPS180-2 defines.
*/
function _nano_sha256($str, $ig_func = true) {
$obj = new nanoSha2((defined('_NANO_SHA2_UPPER')) ? true : false);
return $obj->hash($str, $ig_func);
}
/**
* Generates a SHA256 using whatever methods are available. If no valid function can be found, the data will be returned unhashed.
*
* @param string $data - The data to encrypt.
* @return string - Encrypted data.
* @author Joseph Todd Parsons <*****@*****.**>
*/
function fim_sha256($data)
{
global $config;
if (function_exists('hash') && in_array('sha256', hash_algos())) {
return hash('sha256', $data);
} elseif (function_exists('mhash') && defined('MHASH_SHA256')) {
return mhash(MHASH_SHA256, $data);
} else {
// Otherwise, we use a third-party SHA256 library. Expect slowness. [TODO: Test]
require 'functions/sha256.php';
// Require SHA256 class provided by NanoLink.ca.
$obj = new nanoSha2();
$shaStr = $obj->hash($data);
}
}
