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Google
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Verifier
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Editing: Pem.php
<?php /* * Copyright 2011 Google Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ if (!class_exists('UDP_Google_Client')) { require_once dirname(__FILE__) . '/../autoload.php'; } /** * Verifies signatures using PEM encoded certificates. * * @author Brian Eaton <beaton@google.com> */ class Google_Verifier_Pem extends Google_Verifier_Abstract { private $publicKey; /** * Constructs a verifier from the supplied PEM-encoded certificate. * * $pem: a PEM encoded certificate (not a file). * @param $pem * @throws Google_Auth_Exception * @throws Google_Exception */ public function __construct($pem) { if (!function_exists('openssl_x509_read')) { throw new Google_Exception('Google API PHP client needs the openssl PHP extension'); } $this->publicKey = openssl_x509_read($pem); if (!$this->publicKey) { throw new Google_Auth_Exception("Unable to parse PEM: $pem"); // phpcs:ignore WordPress.Security.EscapeOutput.ExceptionNotEscaped -- Error message to be escaped when caught and printed. } } public function __destruct() { if ($this->publicKey) { openssl_x509_free($this->publicKey); } } /** * Verifies the signature on data. * * Returns true if the signature is valid, false otherwise. * @param $data * @param $signature * @throws Google_Auth_Exception * @return bool */ public function verify($data, $signature) { // @codingStandardsIgnoreLine $hash = defined("OPENSSL_ALGO_SHA256") ? OPENSSL_ALGO_SHA256 : "sha256"; $status = openssl_verify($data, $signature, $this->publicKey, $hash); if ($status === -1) { throw new Google_Auth_Exception('Signature verification error: ' . openssl_error_string()); // phpcs:ignore WordPress.Security.EscapeOutput.ExceptionNotEscaped -- Error message to be escaped when caught and printed. } return $status === 1; } }
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