wp-database-backup / includes / admin / Destination / Google / google-api-php-client / src / auth / Google_PemVerifier.php

Google_PemVerifier.php in WP Database Backup – Unlimited Database & Files Backup by Backup for WP 6.11, at includes/admin/Destination/Google/google-api-php-client/src/auth/Google_PemVerifier.php

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1	<?php
2	/*
3	* Copyright 2011 Google Inc.
4	*
5	* Licensed under the Apache License, Version 2.0 (the "License");
6	* you may not use this file except in compliance with the License.
7	* You may obtain a copy of the License at
8	*
9	* http://www.apache.org/licenses/LICENSE-2.0
10	*
11	* Unless required by applicable law or agreed to in writing, software
12	* distributed under the License is distributed on an "AS IS" BASIS,
13	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14	* See the License for the specific language governing permissions and
15	* limitations under the License.
16	*/
17
18	/**
19	* Verifies signatures using PEM encoded certificates.
20	*
21	* @author Brian Eaton <beaton@google.com>
22	*/
23	class Google_PemVerifier extends Google_Verifier {
24	private $publicKey;
25
26	/**
27	* Constructs a verifier from the supplied PEM-encoded certificate.
28	*
29	* $pem: a PEM encoded certificate (not a file).
30	* @param $pem
31	* @throws Google_AuthException
32	* @throws Google_Exception
33	*/
34	function __construct($pem) {
35	if (!function_exists('openssl_x509_read')) {
36	throw new Google_Exception('Google API PHP client needs the openssl PHP extension');
37	}
38	$this->publicKey = openssl_x509_read($pem);
39	if (!$this->publicKey) {
40	throw new Google_AuthException("Unable to parse PEM: $pem");
41	}
42	}
43
44	function __destruct() {
45	if ($this->publicKey) {
46	openssl_x509_free($this->publicKey);
47	}
48	}
49
50	/**
51	* Verifies the signature on data.
52	*
53	* Returns true if the signature is valid, false otherwise.
54	* @param $data
55	* @param $signature
56	* @throws Google_AuthException
57	* @return bool
58	*/
59	function verify($data, $signature) {
60	$status = openssl_verify($data, $signature, $this->publicKey, "sha256");
61	if ($status === -1) {
62	throw new Google_AuthException('Signature verification error: ' . openssl_error_string());
63	}
64	return $status === 1;
65	}
66	}
67