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<?php
/**
* Implementation of VerificationIF for hashing a signable object
*
* Copyright (C) 2013 OEMR 501c3 www.oemr.org
*
* LICENSE: This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 3
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://opensource.org/licenses/gpl-license.php>;.
*
* @package OpenEMR
* @author Ken Chapple <ken@mi-squared.com>
* @author Medical Information Integration, LLC
* @link http://www.open-emr.org
**/
namespace ESign;
require_once $GLOBALS['srcdir'] . '/ESign/VerificationIF.php';
class Utils_Verification implements VerificationIF
{
public function hash($data, $algo = 'sha3-512')
{
$string = "";
if (is_array($data)) {
$string = $this->stringifyArray($data);
} else {
$string = $data;
}
if ($algo == 'sha1') {
// support backward compatibility of prior hashes in sha1
$hash = sha1($string);
} else {
$hash = hash('sha3-512', $string);
}
return $hash;
}
protected function stringifyArray(array $arr)
{
$string = "";
foreach ($arr as $part) {
if (is_array($part)) {
$string .= $this->stringifyArray($part);
} else {
$string .= $part;
}
}
return $string;
}
public function verify($data, $hash)
{
if (strlen($hash) < 50) {
// support backward compatibility of prior hashes in sha1
$currentHash = $this->hash($data, 'sha1');
} else {
$currentHash = $this->hash($data);
}
if (hash_equals($currentHash, $hash)) {
return true;
}
return false;
}
}