Merge branch '2.8RC'

1 files changed, 135 insertions, 0 deletions

diff --git a/Zotlabs/Lib/LDSignatures.php b/Zotlabs/Lib/LDSignatures.php
new file mode 100644
index 000000000..6d7127cde
--- /dev/null
+++ b/Zotlabs/Lib/LDSignatures.php
@@ -0,0 +1,135 @@
+<?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));
+
+		$x = rsa_verify($ohash . $dhash,base64_decode($data['signature']['signatureValue']), $pubkey);
+		logger('LD-verify: ' . intval($x));
+
+		return $x;
+	}
+
+	static function dopplesign(&$data,$channel) {
+	// remove for the time being - performance issues
+	//	$data['magicEnv'] = self::salmon_sign($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']));
+
+		$signed = array_merge([
+			'@context' => [ 
+				ACTIVITYSTREAMS_JSONLD_REV, 
+				'https://w3id.org/security/v1' ],
+			],$options);
+
+		return $signed;
+	}
+
+
+	static function signable_data($data) {
+
+		$newdata = [];
+		if($data) {
+			foreach($data as $k => $v) {
+				if(! in_array($k,[ 'signature' ])) {
+					$newdata[$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 '';
+
+		jsonld_set_document_loader('jsonld_document_loader');
+	
+		try {
+			$d = jsonld_normalize($data,[ 'algorithm' => 'URDNA2015', 'format' => 'application/nquads' ]);
+		}
+		catch (\Exception $e) {
+			logger('normalise error:' . print_r($e,true));
+			logger('normalise error: ' . print_r($data,true));
+		}
+
+		return $d;
+	}
+
+	static function salmon_sign($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
+		]);
+
+	}
+
+
+
+}
\ No newline at end of file