friendica/src/Util/LDSignature.php

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<?php
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/**
* @copyright Copyright (C) 2020, Friendica
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
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namespace Friendica\Util;
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use Friendica\Core\Logger;
use Friendica\Model\APContact;
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/**
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* Implements JSON-LD signatures
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*
* Ported from Osada: https://framagit.org/macgirvin/osada
*/
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class LDSignature
{
public static function isSigned($data)
{
return !empty($data['signature']);
}
public static function getSigner($data)
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{
if (!self::isSigned($data)) {
return false;
}
$actor = JsonLD::fetchElement($data, 'actor', 'id');
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if (empty($actor) || !is_string($actor)) {
return false;
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}
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$profile = APContact::getByURL($actor);
if (empty($profile['pubkey'])) {
return false;
}
$pubkey = $profile['pubkey'];
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$ohash = self::hash(self::signableOptions($data['signature']));
$dhash = self::hash(self::signableData($data));
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$x = Crypto::rsaVerify($ohash . $dhash, base64_decode($data['signature']['signatureValue']), $pubkey);
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Logger::log('LD-verify: ' . intval($x));
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if (empty($x)) {
return false;
} else {
return $actor;
}
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}
public static function sign($data, $owner)
{
$options = [
'type' => 'RsaSignature2017',
'nonce' => Strings::getRandomHex(64),
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'creator' => $owner['url'] . '#main-key',
'created' => DateTimeFormat::utcNow(DateTimeFormat::ATOM)
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];
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$ohash = self::hash(self::signableOptions($options));
$dhash = self::hash(self::signableData($data));
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$options['signatureValue'] = base64_encode(Crypto::rsaSign($ohash . $dhash, $owner['uprvkey']));
return array_merge($data, ['signature' => $options]);
}
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private static function signableData($data)
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{
unset($data['signature']);
return $data;
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}
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private static function signableOptions($options)
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{
$newopts = ['@context' => 'https://w3id.org/identity/v1'];
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unset($options['type']);
unset($options['id']);
unset($options['signatureValue']);
return array_merge($newopts, $options);
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}
private static function hash($obj)
{
return hash('sha256', JsonLD::normalize($obj));
}
}