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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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/** |
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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 apiPemVerifier extends apiVerifier { |
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private $publicKey; |
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|
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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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* $pem: a PEM encoded certificate (not a file). |
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*/ |
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function __construct($pem) { |
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if (!function_exists('openssl_x509_read')) { |
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throw new Exception( |
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'The Google PHP API library 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 apiAuthException("Unable to parse PEM: $pem"); |
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} |
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} |
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|
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function __destruct() { |
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if ($this->publicKey) { |
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openssl_x509_free($this->publicKey); |
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} |
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} |
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|
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/** |
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* Verifies the signature on data. |
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* |
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* Returns true if the signature is valid, false otherwise. |
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*/ |
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function verify($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 apiAuthException("Signature verification error: " . |
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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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|
