135 lines
3.3 KiB
PHP
135 lines
3.3 KiB
PHP
<?php
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namespace Zotlabs\Lib;
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require_once('library/jsonld/jsonld.php');
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class LDSignatures {
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static function verify($data,$pubkey) {
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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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$x = rsa_verify($ohash . $dhash,base64_decode($data['signature']['signatureValue']), $pubkey);
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logger('LD-verify: ' . intval($x));
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return $x;
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}
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static function dopplesign(&$data,$channel) {
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// remove for the time being - performance issues
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// $data['magicEnv'] = self::salmon_sign($data,$channel);
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return self::sign($data,$channel);
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}
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static function sign($data,$channel) {
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$options = [
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'type' => 'RsaSignature2017',
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'nonce' => random_string(64),
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'creator' => z_root() . '/channel/' . $channel['channel_address'] . '/public_key_pem',
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'created' => datetime_convert('UTC','UTC', 'now', 'Y-m-d\Th:i:s\Z')
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];
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$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(rsa_sign($ohash . $dhash,$channel['channel_prvkey']));
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$signed = array_merge([
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'@context' => [
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ACTIVITYSTREAMS_JSONLD_REV,
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'https://w3id.org/security/v1' ],
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],$options);
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return $signed;
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}
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static function signable_data($data) {
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$newdata = [];
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if($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] = $v;
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}
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}
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}
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return json_encode($newdata,JSON_UNESCAPED_SLASHES);
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}
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static function signable_options($options) {
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$newopts = [ '@context' => 'https://w3id.org/identity/v1' ];
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if($options) {
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foreach($options as $k => $v) {
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if(! in_array($k,[ 'type','id','signatureValue' ])) {
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$newopts[$k] = $v;
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}
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}
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}
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return json_encode($newopts,JSON_UNESCAPED_SLASHES);
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}
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static function hash($obj) {
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return hash('sha256',self::normalise($obj));
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}
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static function normalise($data) {
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if(is_string($data)) {
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$data = json_decode($data);
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}
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if(! is_object($data))
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return '';
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jsonld_set_document_loader('jsonld_document_loader');
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try {
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$d = jsonld_normalize($data,[ 'algorithm' => 'URDNA2015', 'format' => 'application/nquads' ]);
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}
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catch (\Exception $e) {
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logger('normalise error:' . print_r($e,true));
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logger('normalise error: ' . print_r($data,true));
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}
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return $d;
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}
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static function salmon_sign($data,$channel) {
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$arr = $data;
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$data = json_encode($data,JSON_UNESCAPED_SLASHES);
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$data = base64url_encode($data, false); // do not strip padding
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$data_type = 'application/activity+json';
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$encoding = 'base64url';
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$algorithm = 'RSA-SHA256';
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$keyhash = base64url_encode(z_root() . '/channel/' . $channel['channel_address']);
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$data = str_replace(array(" ","\t","\r","\n"),array("","","",""),$data);
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// precomputed base64url encoding of data_type, encoding, algorithm concatenated with periods
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$precomputed = '.' . base64url_encode($data_type,false) . '.YmFzZTY0dXJs.UlNBLVNIQTI1Ng==';
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$signature = base64url_encode(rsa_sign($data . $precomputed,$channel['channel_prvkey']));
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return ([
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'id' => $arr['id'],
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'meData' => $data,
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'meDataType' => $data_type,
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'meEncoding' => $encoding,
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'meAlgorithm' => $algorithm,
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'meCreator' => z_root() . '/channel/' . $channel['channel_address'] . '/public_key_pem',
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'meSignatureValue' => $signature
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]);
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}
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} |