56 lines
1.8 KiB
PHP
56 lines
1.8 KiB
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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Verifies signatures using PEM encoded certificates.
|
||
|
|
* @author Brian Eaton <beaton@google.com>
|
||
|
|
*/
|
||
|
|
class apiPemVerifier extends apiVerifier {
|
||
|
|
private $publicKey;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Constructs a verifier from the supplied PEM-encoded certificate.
|
||
|
|
* $pem: a PEM encoded certificate (not a file).
|
||
|
|
*/
|
||
|
|
function __construct($pem) {
|
||
|
|
if (!function_exists('openssl_x509_read')) {
|
||
|
|
throw new Exception(
|
||
|
|
'The Google PHP API library needs the openssl PHP extension');
|
||
|
|
}
|
||
|
|
$this->publicKey = openssl_x509_read($pem);
|
||
|
|
if (!$this->publicKey) {
|
||
|
|
throw new apiAuthException("Unable to parse PEM: $pem");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
function __destruct() {
|
||
|
|
if ($this->publicKey) {
|
||
|
|
openssl_x509_free($this->publicKey);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Verifies the signature on data.
|
||
|
|
* Returns true if the signature is valid, false otherwise.
|
||
|
|
*/
|
||
|
|
function verify($data, $signature) {
|
||
|
|
$status = openssl_verify($data, $signature, $this->publicKey, "sha256");
|
||
|
|
if ($status === -1) {
|
||
|
|
throw new apiAuthException("Signature verification error: " .
|
||
|
|
openssl_error_string());
|
||
|
|
}
|
||
|
|
return $status === 1;
|
||
|
|
}
|
||
|
|
}
|