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