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