friendica/src/Util/LDSignature.php

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<?php
namespace Friendica\Util;
use Friendica\Util\JsonLD;
use Friendica\Util\DateTimeFormat;
use Friendica\Protocol\ActivityPub;
use Friendica\Model\APContact;
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/**
* @brief Implements JSON-LD signatures
*
* 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');
if (empty($actor)) {
return false;
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}
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$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']), $pubkey);
logger('LD-verify: ' . intval($x));
if (empty($x)) {
return false;
} else {
return $actor;
}
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}
public static function sign($data, $owner)
{
$options = [
'type' => 'RsaSignature2017',
'nonce' => random_string(64),
'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));
}
}