129 lines
3 KiB
PHP
129 lines
3 KiB
PHP
<?php
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// Copyright (C) 2010-2024, the Friendica project
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// SPDX-FileCopyrightText: 2010-2024 the Friendica project
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//
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// SPDX-License-Identifier: AGPL-3.0-or-later
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namespace Friendica\Util;
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use Friendica\DI;
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use Friendica\Model\APContact;
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/**
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* Implements JSON-LD signatures
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*
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* Ported from Osada: https://framagit.org/macgirvin/osada
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*/
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class LDSignature
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{
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/**
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* Checks if element 'signature' is found and not empty
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*
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* @param array $data
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* @return bool
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*/
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public static function isSigned(array $data): bool
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{
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return !empty($data['signature']);
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}
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/**
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* Returns actor (signer) from given data
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*
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* @param array $data
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* @return mixed Returns actor or false on error
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*/
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public static function getSigner(array $data)
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{
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if (!self::isSigned($data)) {
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return false;
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}
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$actor = JsonLD::fetchElement($data, 'actor', 'id');
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if (empty($actor) || !is_string($actor)) {
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return false;
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}
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$profile = APContact::getByURL($actor);
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if (empty($profile['pubkey'])) {
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return false;
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}
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$pubkey = $profile['pubkey'];
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$ohash = self::hash(self::signableOptions($data['signature']));
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$dhash = self::hash(self::signableData($data));
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$x = Crypto::rsaVerify($ohash . $dhash, base64_decode($data['signature']['signatureValue']), $pubkey);
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DI::logger()->info('LD-verify', ['verified' => (int)$x, 'actor' => $profile['url']]);
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if (empty($x)) {
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return false;
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} else {
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return $actor;
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}
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}
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/**
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* Signs given data by owner's signature
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*
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* @param array $data Data to sign
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* @param array $owner Owner information, like URL
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* @return array Merged array of $data and signature
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*/
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public static function sign(array $data, array $owner): array
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{
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$options = [
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'type' => 'RsaSignature2017',
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'nonce' => Strings::getRandomHex(64),
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'creator' => $owner['url'] . '#main-key',
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'created' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
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];
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$ohash = self::hash(self::signableOptions($options));
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$dhash = self::hash(self::signableData($data));
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$options['signatureValue'] = base64_encode(Crypto::rsaSign($ohash . $dhash, $owner['uprvkey']));
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return array_merge($data, ['signature' => $options]);
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}
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/**
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* Removes element 'signature' from array
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*
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* @param array $data
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* @return array With no element 'signature'
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*/
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private static function signableData(array $data): array
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{
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unset($data['signature']);
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return $data;
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}
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/**
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* Removes some elements and adds '@context' to it
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*
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* @param array $options
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* @return array With some removed elements and added '@context' element
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*/
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private static function signableOptions(array $options): array
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{
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$newopts = ['@context' => 'https://w3id.org/identity/v1'];
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unset($options['type']);
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unset($options['id']);
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unset($options['signatureValue']);
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return array_merge($newopts, $options);
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}
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/**
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* Hashes normalized object
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*
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* @param array $obj
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* @return string SHA256 hash
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*/
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private static function hash($obj): string
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{
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return hash('sha256', JsonLD::normalize($obj));
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}
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}
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