93 lines
2.0 KiB
PHP
93 lines
2.0 KiB
PHP
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<?php
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namespace Friendica\Util;
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use Friendica\Util\JsonLD;
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use Friendica\Util\DateTimeFormat;
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use Friendica\Protocol\ActivityPub;
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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 isVerified($data, $pubkey = null)
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{
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if (!self::isSigned($data)) {
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return false;
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}
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if (empty($pubkey)) {
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$actor = JsonLD::fetchElement($data, 'actor', 'id');
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if (empty($actor)) {
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return false;
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}
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$profile = ActivityPub::fetchprofile($actor);
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if (empty($profile['pubkey'])) {
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return false;
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}
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$pubkey = $profile['pubkey'];
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}
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$ohash = self::hash(self::signable_options($data['signature']));
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$dhash = self::hash(self::signable_data($data));
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$x = Crypto::rsaVerify($ohash . $dhash, base64_decode($data['signature']['signatureValue']), $pubkey);
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logger('LD-verify: ' . intval($x));
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return $x;
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}
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public static function sign($data, $owner)
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{
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$options = [
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'type' => 'RsaSignature2017',
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'nonce' => random_string(64),
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'creator' => $owner['url'] . '#main-key',
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'created' => DateTimeFormat::utcNow()
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];
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$ohash = self::hash(self::signable_options($options));
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$dhash = self::hash(self::signable_data($data));
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$options['signatureValue'] = base64_encode(Crypto::rsaSign($ohash . $dhash, $owner['uprvkey']));
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return array_merge($data, ['signature' => $options]);
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}
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private static function signable_data($data)
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{
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$newdata = [];
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if (!empty($data)) {
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foreach ($data as $k => $v) {
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if (!in_array($k, ['signature'])) {
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$newdata[$k] = $v;
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}
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}
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}
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return $newdata;
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}
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private static function signable_options($options)
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{
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$newopts = ['@context' => 'https://w3id.org/identity/v1'];
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if (!empty($options)) {
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foreach ($options as $k => $v) {
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if (!in_array($k, ['type','id','signatureValue'])) {
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$newopts[$k] = $v;
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}
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}
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}
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return $newopts;
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}
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private static function hash($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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