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Editing: P12.php

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<?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.
 */

if (!defined('ABSPATH')) die('No direct access allowed');

if (!class_exists('UDP_Google_Client')) {
  require_once dirname(__FILE__) . '/../autoload.php';
}

/**
 * Signs data.
 *
 * Only used for testing.
 *
 * @author Brian Eaton <beaton@google.com>
 */
class Google_Signer_P12 extends Google_Signer_Abstract
{
  // OpenSSL private key resource
  private $privateKey;

// Creates a new signer from a .p12 file.
  public function __construct($p12, $password)
  {
    if (!function_exists('openssl_x509_read')) {
      throw new Google_Exception(
          'The Google PHP API library needs the openssl PHP extension'
      );
    }

// If the private key is provided directly, then this isn't in the p12
    // format. Different versions of openssl support different p12 formats
    // and the key from google wasn't being accepted by the version available
    // at the time.
    if (!$password && strpos($p12, "-----BEGIN RSA PRIVATE KEY-----") !== false) {
      $this->privateKey = openssl_pkey_get_private($p12);
    } elseif($password === 'notasecret' && strpos($p12, "-----BEGIN PRIVATE KEY-----") !== false) {
      $this->privateKey = openssl_pkey_get_private($p12);
    } else {
      // This throws on error
      $certs = array();
      if (!openssl_pkcs12_read($p12, $certs, $password)) {
        throw new Google_Auth_Exception(
            "Unable to parse the p12 file.  " .
            "Is this a .p12 file?  Is the password correct?  OpenSSL error: " .
            openssl_error_string() // phpcs:ignore WordPress.Security.EscapeOutput.ExceptionNotEscaped -- Error message to be escaped when caught and printed.
        );
      }
      // TODO(beaton): is this part of the contract for the openssl_pkcs12_read
      // method?  What happens if there are multiple private keys?  Do we care?
      if (!array_key_exists("pkey", $certs) || !$certs["pkey"]) {
        throw new Google_Auth_Exception("No private key found in p12 file.");
      }
      $this->privateKey = openssl_pkey_get_private($certs['pkey']);
    }

if (!$this->privateKey) {
      throw new Google_Auth_Exception("Unable to load private key");
    }
  }

public function __destruct()
  {
    if ($this->privateKey) {
      openssl_pkey_free($this->privateKey);
    }
  }

public function sign($data)
  {
    if (version_compare(PHP_VERSION, '5.3.0') < 0) {
      throw new Google_Auth_Exception(
          "PHP 5.3.0 or higher is required to use service accounts."
      );
    }
    // @codingStandardsIgnoreLine
    $hash = defined("OPENSSL_ALGO_SHA256") ? OPENSSL_ALGO_SHA256 : "sha256";
    if (!openssl_sign($data, $signature, $this->privateKey, $hash)) {
      throw new Google_Auth_Exception("Unable to sign data");
    }
    return $signature;
  }
}

Editing: P12.php

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