87 lines
1.9 KiB
PHP
87 lines
1.9 KiB
PHP
<?php
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namespace Friendica\Util;
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use Friendica\Core\Logger;
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use Friendica\Model\APContact;
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/**
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* @brief 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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public static function isSigned($data)
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{
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return !empty($data['signature']);
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}
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public static function getSigner($data)
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{
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if (!self::isSigned($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']), $pubkey);
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Logger::log('LD-verify: ' . intval($x));
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if (empty($x)) {
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return false;
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} else {
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return $actor;
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}
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}
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public static function sign($data, $owner)
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{
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$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' => $options]);
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}
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private static function signableData($data)
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{
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unset($data['signature']);
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return $data;
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}
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private static function signableOptions($options)
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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, $options);
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}
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private static function hash($obj)
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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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