installed plugin W3 Total Cache version 2.3.2

wp-content/plugins/w3-total-cache/lib/Google/Verifier/Pem.php

@@ -0,0 +1,71 @@
+<?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 W3TCG_Google_Verifier_Pem extends W3TCG_Google_Verifier_Abstract
+{
+  private $publicKey;
+
+  /**
+   * Constructs a verifier from the supplied PEM-encoded certificate.
+   *
+   * $pem: a PEM encoded certificate (not a file).
+   * @param $pem
+   * @throws W3TCG_Google_Auth_Exception
+   * @throws W3TCG_Google_Exception
+   */
+  public function __construct($pem)
+  {
+    if (!function_exists('openssl_x509_read')) {
+      throw new W3TCG_Google_Exception('Google API PHP client needs the openssl PHP extension');
+    }
+    $this->publicKey = openssl_x509_read($pem);
+    if (!$this->publicKey) {
+      throw new W3TCG_Google_Auth_Exception("Unable to parse PEM: $pem");
+    }
+  }
+
+  public function __destruct()
+  {
+    if ($this->publicKey) {
+      openssl_x509_free($this->publicKey);
+    }
+  }
+
+  /**
+   * Verifies the signature on data.
+   *
+   * Returns true if the signature is valid, false otherwise.
+   * @param $data
+   * @param $signature
+   * @throws W3TCG_Google_Auth_Exception
+   * @return bool
+   */
+  public function verify($data, $signature)
+  {
+    $hash = defined("OPENSSL_ALGO_SHA256") ? OPENSSL_ALGO_SHA256 : "sha256";
+    $status = openssl_verify($data, $signature, $this->publicKey, $hash);
+    if ($status === -1) {
+      throw new W3TCG_Google_Auth_Exception('Signature verification error: ' . openssl_error_string());
+    }
+    return $status === 1;
+  }
+}