Make the proxy functionality optional

[friendica.git] / src / Util / Crypto.php

diff --git a/src/Util/Crypto.php b/src/Util/Crypto.php
index 7b2c75a94a7c54ad377b1317599b05f6a470122e..b3ae2d69b8442cad3c819f8cf2935e3f9d728889 100644 (file)
--- a/src/Util/Crypto.php
+++ b/src/Util/Crypto.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * @copyright Copyright (C) 2020, Friendica
+ * @copyright Copyright (C) 2010-2021, the Friendica project
  *
  * @license GNU AGPL version 3 or any later version
  *
@@ -21,10 +21,12 @@
 
 namespace Friendica\Util;
 
+use Exception;
 use Friendica\Core\Hook;
 use Friendica\Core\Logger;
 use Friendica\Core\System;
 use Friendica\DI;
+use ParagonIE\ConstantTime\Base64UrlSafe;
 use phpseclib\Crypt\RSA;
 use phpseclib\Math\BigInteger;
 
@@ -150,6 +152,50 @@ class Crypto
                return $response;
        }
 
+       /**
+        * Create a new elliptic curve key pair
+        *
+        * @return array with the elements "prvkey", "pubkey", "vapid-public" and "vapid-private"
+        */
+       public static function newECKeypair()
+       {
+               $openssl_options = [
+                       'curve_name'       => 'prime256v1',
+                       'private_key_type' => OPENSSL_KEYTYPE_EC
+               ];
+
+               $conf = DI::config()->get('system', 'openssl_conf_file');
+               if ($conf) {
+                       $openssl_options['config'] = $conf;
+               }
+               $result = openssl_pkey_new($openssl_options);
+
+               if (empty($result)) {
+                       throw new Exception('Key creation failed');
+               }
+
+               $response = ['prvkey' => '', 'pubkey' => ''];
+
+               // Get private key
+               openssl_pkey_export($result, $response['prvkey']);
+
+               // Get public key
+               $pkey = openssl_pkey_get_details($result);
+               $response['pubkey'] = $pkey['key'];
+
+               // Create VAPID keys
+               // @see https://github.com/web-push-libs/web-push-php/blob/256a18b2a2411469c94943725fb6eccb9681bd75/src/Utils.php#L60-L62
+               $hexString = '04';
+               $hexString .= str_pad(bin2hex($pkey['ec']['x']), 64, '0', STR_PAD_LEFT);
+               $hexString .= str_pad(bin2hex($pkey['ec']['y']), 64, '0', STR_PAD_LEFT);
+               $response['vapid-public'] = Base64UrlSafe::encode(hex2bin($hexString));
+
+               // @see https://github.com/web-push-libs/web-push-php/blob/256a18b2a2411469c94943725fb6eccb9681bd75/src/VAPID.php
+               $response['vapid-private'] = Base64UrlSafe::encode(hex2bin(str_pad(bin2hex($pkey['ec']['d']), 64, '0', STR_PAD_LEFT)));
+
+               return $response;
+       }
+
        /**
         * Encrypt a string with 'aes-256-cbc' cipher method.
         *