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wp-content/plugins/wp-mail-smtp/vendor/google/auth/src/ServiceAccountSignerTrait.php

@@ -0,0 +1,57 @@
+<?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);
+    }
+}