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