| 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 |
if (!class_exists('Google_Client')) { |
| 19 |
require_once dirname(__FILE__) . '/../autoload.php'; |
| 20 |
} |
| 21 |
|
| 22 |
/** |
| 23 |
* Verifies signatures using PEM encoded certificates. |
| 24 |
* |
| 25 |
* @author Brian Eaton <beaton@google.com> |
| 26 |
*/ |
| 27 |
class Google_Verifier_Pem extends Google_Verifier_Abstract |
| 28 |
{ |
| 29 |
private $publicKey; |
| 30 |
|
| 31 |
/** |
| 32 |
* Constructs a verifier from the supplied PEM-encoded certificate. |
| 33 |
* |
| 34 |
* $pem: a PEM encoded certificate (not a file). |
| 35 |
* @param $pem |
| 36 |
* @throws Google_Auth_Exception |
| 37 |
* @throws Google_Exception |
| 38 |
*/ |
| 39 |
public function __construct($pem) |
| 40 |
{ |
| 41 |
if (!function_exists('openssl_x509_read')) { |
| 42 |
throw new Google_Exception('Google API PHP client needs the openssl PHP extension'); |
| 43 |
} |
| 44 |
$this->publicKey = openssl_x509_read($pem); |
| 45 |
if (!$this->publicKey) { |
| 46 |
throw new Google_Auth_Exception("Unable to parse PEM: $pem"); |
| 47 |
} |
| 48 |
} |
| 49 |
|
| 50 |
public function __destruct() |
| 51 |
{ |
| 52 |
if ($this->publicKey) { |
| 53 |
openssl_x509_free($this->publicKey); |
| 54 |
} |
| 55 |
} |
| 56 |
|
| 57 |
/** |
| 58 |
* Verifies the signature on data. |
| 59 |
* |
| 60 |
* Returns true if the signature is valid, false otherwise. |
| 61 |
* @param $data |
| 62 |
* @param $signature |
| 63 |
* @throws Google_Auth_Exception |
| 64 |
* @return bool |
| 65 |
*/ |
| 66 |
public function verify($data, $signature) |
| 67 |
{ |
| 68 |
$hash = defined("OPENSSL_ALGO_SHA256") ? OPENSSL_ALGO_SHA256 : "sha256"; |
| 69 |
$status = openssl_verify($data, $signature, $this->publicKey, $hash); |
| 70 |
if ($status === -1) { |
| 71 |
throw new Google_Auth_Exception('Signature verification error: ' . openssl_error_string()); |
| 72 |
} |
| 73 |
return $status === 1; |
| 74 |
} |
| 75 |
} |
| 76 |
|
