diff options
Diffstat (limited to 'Zotlabs/Lib')
| -rw-r--r-- | Zotlabs/Lib/LDSignatures.php | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/Zotlabs/Lib/LDSignatures.php b/Zotlabs/Lib/LDSignatures.php new file mode 100644 index 000000000..88dfe80c0 --- /dev/null +++ b/Zotlabs/Lib/LDSignatures.php @@ -0,0 +1,117 @@ +<?php + +namespace Zotlabs\Lib; + +require_once('library/jsonld/jsonld.php'); + +class LDSignatures { + + + static function verify($data,$pubkey) { + + $ohash = self::hash(self::signable_options($data['signature'])); + $dhash = self::hash(self::signable_data($data)); + + return rsa_verify($ohash . $dhash,base64_decode($data['signature']['signatureValue']), $pubkey); + } + + static function dopplesign(&$data,$channel) { + $data['magicEnv'] = self::salmon_sign($data,$channel); + return self::sign($data,$channel); + } + + static function sign($data,$channel) { + $options = [ + 'type' => 'RsaSignature2017', + 'nonce' => random_string(64), + 'creator' => z_root() . '/channel/' . $channel['channel_address'] . '/public_key_pem', + 'created' => datetime_convert('UTC','UTC', 'now', 'Y-m-d\Th:i:s\Z') + ]; + + $ohash = self::hash(self::signable_options($options)); + $dhash = self::hash(self::signable_data($data)); + $options['signatureValue'] = base64_encode(rsa_sign($ohash . $dhash,$channel['channel_prvkey'])); + + $signed = array_merge([ + '@context' => [ 'https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1' ], + ],$options); + + return $signed; + } + + + static function signable_data($data) { + + $newdata = []; + if($data) { + foreach($data as $k => $v) { + if(! in_array($k,[ 'signature' ])) { + $newopts[$k] = $v; + } + } + } + return json_encode($newdata,JSON_UNESCAPED_SLASHES); + } + + + static function signable_options($options) { + + $newopts = [ '@context' => 'https://w3id.org/identity/v1' ]; + if($options) { + foreach($options as $k => $v) { + if(! in_array($k,[ 'type','id','signatureValue' ])) { + $newopts[$k] = $v; + } + } + } + return json_encode($newopts,JSON_UNESCAPED_SLASHES); + } + + static function hash($obj) { + return hash('sha256',self::normalise($obj)); + } + + static function normalise($data) { + if(is_string($data)) { + $data = json_decode($data); + } + + if(! is_object($data)) + return ''; + + return jsonld_normalize($data,[ 'algorithm' => 'URDNA2015', 'format' => 'application/nquads' ]); + } + + static function salmon_sign($data,$channel) { + + $arr = $data; + $data = json_encode($data,JSON_UNESCAPED_SLASHES); + $data = base64url_encode($data, false); // do not strip padding + $data_type = 'application/activity+json'; + $encoding = 'base64url'; + $algorithm = 'RSA-SHA256'; + $keyhash = base64url_encode(z_root() . '/channel/' . $channel['channel_address']); + + $data = str_replace(array(" ","\t","\r","\n"),array("","","",""),$data); + + // precomputed base64url encoding of data_type, encoding, algorithm concatenated with periods + + $precomputed = '.' . base64url_encode($data_type,false) . '.YmFzZTY0dXJs.UlNBLVNIQTI1Ng=='; + + $signature = base64url_encode(rsa_sign($data . $precomputed,$channel['channel_prvkey'])); + + return ([ + 'id' => $arr['id'], + 'meData' => $data, + 'meDataType' => $data_type, + 'meEncoding' => $encoding, + 'meAlgorithm' => $algorithm, + 'meCreator' => z_root() . '/channel/' . $channel['channel_address'] . '/public_key_pem', + 'meSignatureValue' => $signature + ]); + + } + + + +}
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