[Summary view]

Differences Between: [Versions 310 and 403] [Versions 311 and 403] [Versions 39 and 403] [Versions 400 and 403] [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  #[AllowDynamicProperties]
  28  class Google_Verifier_Pem extends Google_Verifier_Abstract
  29  {
  30    private $publicKey;
  31  
  32    /**
  33     * Constructs a verifier from the supplied PEM-encoded certificate.
  34     *
  35     * $pem: a PEM encoded certificate (not a file).
  36     * @param $pem
  37     * @throws Google_Auth_Exception
  38     * @throws Google_Exception
  39     */
  40    public function __construct($pem)
  41    {
  42      if (!function_exists('openssl_x509_read')) {
  43        throw new Google_Exception('Google API PHP client needs the openssl PHP extension');
  44      }
  45      $this->publicKey = openssl_x509_read($pem);
  46      if (!$this->publicKey) {
  47        throw new Google_Auth_Exception("Unable to parse PEM: $pem");
  48      }
  49    }
  50  
  51    public function __destruct()
  52    {
  53      if ($this->publicKey) {
  54        // TODO: Remove this block once PHP 8.0 becomes required.
  55        if (PHP_MAJOR_VERSION < 8) {
  56            openssl_x509_free($this->publicKey);
  57        }
  58      }
  59    }
  60  
  61    /**
  62     * Verifies the signature on data.
  63     *
  64     * Returns true if the signature is valid, false otherwise.
  65     * @param $data
  66     * @param $signature
  67     * @throws Google_Auth_Exception
  68     * @return bool
  69     */
  70    public function verify($data, $signature)
  71    {
  72      $hash = defined("OPENSSL_ALGO_SHA256") ? OPENSSL_ALGO_SHA256 : "sha256";
  73      $status = openssl_verify($data, $signature, $this->publicKey, $hash);
  74      if ($status === -1) {
  75        throw new Google_Auth_Exception('Signature verification error: ' . openssl_error_string());
  76      }
  77      return $status === 1;
  78    }
  79  }