58 lines
1.8 KiB
PHP
58 lines
1.8 KiB
PHP
<?php
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/*
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* Copyright 2019 Google LLC
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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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namespace Google\Auth;
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use phpseclib\Crypt\RSA;
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/**
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* Sign a string using a Service Account private key.
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*/
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trait ServiceAccountSignerTrait
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{
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/**
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* Sign a string using the service account private key.
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*
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* @param string $stringToSign
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* @param bool $forceOpenssl Whether to use OpenSSL regardless of
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* whether phpseclib is installed. **Defaults to** `false`.
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* @return string
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*/
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public function signBlob($stringToSign, $forceOpenssl = false)
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{
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$privateKey = $this->auth->getSigningKey();
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$signedString = '';
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if (class_exists('\\phpseclib\\Crypt\\RSA') && !$forceOpenssl) {
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$rsa = new RSA;
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$rsa->loadKey($privateKey);
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$rsa->setSignatureMode(RSA::SIGNATURE_PKCS1);
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$rsa->setHash('sha256');
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$signedString = $rsa->sign($stringToSign);
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} elseif (extension_loaded('openssl')) {
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openssl_sign($stringToSign, $signedString, $privateKey, 'sha256WithRSAEncryption');
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} else {
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// @codeCoverageIgnoreStart
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throw new \RuntimeException('OpenSSL is not installed.');
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}
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// @codeCoverageIgnoreEnd
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return base64_encode($signedString);
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}
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}
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