mirror of https://github.com/friendica/friendica
78 lines
2.5 KiB
PHP
78 lines
2.5 KiB
PHP
<?php
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/**
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* @copyright Copyright (C) 2010-2022, the Friendica project
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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namespace Friendica\Protocol\Salmon\Format;
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use Friendica\Util\Strings;
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use phpseclib3\Math\BigInteger;
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/**
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* This custom public RSA key format class is meant to be used with the \phpseclib3\Crypto\RSA::addFileFormat method.
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*
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* It handles Salmon's specific magic key string starting with "RSA." and which MIME type is application/magic-key or
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* application/magic-public-key
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*
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* @see https://web.archive.org/web/20160506073138/http://salmon-protocol.googlecode.com:80/svn/trunk/draft-panzer-magicsig-01.html#anchor13
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*/
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class Magic
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{
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public static function load($key, $password = ''): array
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{
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if (!is_string($key)) {
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throw new \UnexpectedValueException('Key should be a string - not a ' . gettype($key));
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}
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$key_info = explode('.', $key);
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if (count($key_info) !== 3) {
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throw new \UnexpectedValueException('Key should have three components separated by periods');
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}
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if ($key_info[0] !== 'RSA') {
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throw new \UnexpectedValueException('Key first component should be "RSA"');
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}
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if (preg_match('#[+/]#', $key_info[1])
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|| preg_match('#[+/]#', $key_info[1])
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) {
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throw new \UnexpectedValueException('Wrong encoding, expecting Base64URLencoding');
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}
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$m = Strings::base64UrlDecode($key_info[1]);
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$e = Strings::base64UrlDecode($key_info[2]);
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if (!$m || !$e) {
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throw new \UnexpectedValueException('Base64 decoding produced an error');
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}
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return [
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'modulus' => new BigInteger($m, 256),
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'publicExponent' => new BigInteger($e, 256),
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'isPublicKey' => true,
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];
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}
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public static function savePublicKey(BigInteger $n, BigInteger $e, array $options = []): string
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{
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return 'RSA.' . Strings::base64UrlEncode($n->toBytes(), true) . '.' . Strings::base64UrlEncode($e->toBytes(), true);
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}
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}
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