- /**
- * 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;
- }
-