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Long Term Support Release
Differences Between: [Versions 310 and 401] [Versions 39 and 401] [Versions 401 and 402] [Versions 401 and 403]
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 // TODO: Remove this block once PHP 8.0 becomes required. 54 if (PHP_MAJOR_VERSION < 8) { 55 openssl_x509_free($this->publicKey); 56 } 57 } 58 } 59 60 /** 61 * Verifies the signature on data. 62 * 63 * Returns true if the signature is valid, false otherwise. 64 * @param $data 65 * @param $signature 66 * @throws Google_Auth_Exception 67 * @return bool 68 */ 69 public function verify($data, $signature) 70 { 71 $hash = defined("OPENSSL_ALGO_SHA256") ? OPENSSL_ALGO_SHA256 : "sha256"; 72 $status = openssl_verify($data, $signature, $this->publicKey, $hash); 73 if ($status === -1) { 74 throw new Google_Auth_Exception('Signature verification error: ' . openssl_error_string()); 75 } 76 return $status === 1; 77 } 78 }
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