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diff --git a/Zotlabs/Zot6/HTTPSig.php b/Zotlabs/Zot6/HTTPSig.php
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+++ b/Zotlabs/Zot6/HTTPSig.php
@@ -0,0 +1,507 @@
+<?php
+
+namespace Zotlabs\Zot6;
+
+use Zotlabs\Lib\ActivityStreams;
+use Zotlabs\Lib\Webfinger;
+use Zotlabs\Web\HTTPHeaders;
+
+/**
+ * @brief Implements HTTP Signatures per draft-cavage-http-signatures-10.
+ *
+ * @see https://tools.ietf.org/html/draft-cavage-http-signatures-10
+ */
+
+class HTTPSig {
+
+	/**
+	 * @brief RFC5843
+	 *
+	 * @see https://tools.ietf.org/html/rfc5843
+	 *
+	 * @param string $body The value to create the digest for
+	 * @param string $alg hash algorithm (one of 'sha256','sha512')
+	 * @return string The generated digest header string for $body
+	 */
+
+	static function generate_digest_header($body,$alg = 'sha256') {
+
+		$digest = base64_encode(hash($alg, $body, true));
+		switch($alg) {
+			case 'sha512':
+				return 'SHA-512=' . $digest;
+			case 'sha256':
+			default:
+				return 'SHA-256=' . $digest;
+				break;
+		}
+	}
+
+	static function find_headers($data,&$body) {
+
+		// decide if $data arrived via controller submission or curl
+
+		if(is_array($data) && $data['header']) {
+			if(! $data['success'])
+				return [];
+
+			$h = new HTTPHeaders($data['header']);
+			$headers = $h->fetcharr();
+			$body = $data['body'];
+		}
+
+		else {
+			$headers = [];
+			$headers['(request-target)'] = strtolower($_SERVER['REQUEST_METHOD']) . ' ' . $_SERVER['REQUEST_URI'];
+			$headers['content-type'] = $_SERVER['CONTENT_TYPE'];
+
+			foreach($_SERVER as $k => $v) {
+				if(strpos($k,'HTTP_') === 0) {
+					$field = str_replace('_','-',strtolower(substr($k,5)));
+					$headers[$field] = $v;
+				}
+			}
+		}
+
+		//logger('SERVER: ' . print_r($_SERVER,true), LOGGER_ALL);
+
+		//logger('headers: ' . print_r($headers,true), LOGGER_ALL);
+
+		return $headers;
+	}
+
+
+	// See draft-cavage-http-signatures-10
+
+	static function verify($data,$key = '') {
+
+		$body      = $data;
+		$headers   = null;
+
+		$result = [
+			'signer'         => '',
+			'portable_id'    => '',
+			'header_signed'  => false,
+			'header_valid'   => false,
+			'content_signed' => false,
+			'content_valid'  => false
+		];
+
+
+		$headers = self::find_headers($data,$body);
+
+		if(! $headers)
+			return $result;
+
+		$sig_block = null;
+
+		if(array_key_exists('signature',$headers)) {
+			$sig_block = self::parse_sigheader($headers['signature']);
+		}
+		elseif(array_key_exists('authorization',$headers)) {
+			$sig_block = self::parse_sigheader($headers['authorization']);
+		}
+
+		if(! $sig_block) {
+			logger('no signature provided.', LOGGER_DEBUG);
+			return $result;
+		}
+
+		// Warning: This log statement includes binary data
+		// logger('sig_block: ' . print_r($sig_block,true), LOGGER_DATA);
+
+		$result['header_signed'] = true;
+
+		$signed_headers = $sig_block['headers'];
+		if(! $signed_headers)
+			$signed_headers = [ 'date' ];
+
+		$signed_data = '';
+		foreach($signed_headers as $h) {
+			if(array_key_exists($h,$headers)) {
+				$signed_data .= $h . ': ' . $headers[$h] . "\n";
+			}
+		}
+		$signed_data = rtrim($signed_data,"\n");
+
+		$algorithm = null;
+		if($sig_block['algorithm'] === 'rsa-sha256') {
+			$algorithm = 'sha256';
+		}
+		if($sig_block['algorithm'] === 'rsa-sha512') {
+			$algorithm = 'sha512';
+		}
+
+		if(! array_key_exists('keyId',$sig_block))
+			return $result;
+
+		$result['signer'] = $sig_block['keyId'];
+
+		$key = self::get_key($key,$result['signer']);
+
+		if(! ($key && $key['public_key'])) {
+			return $result;
+		}
+
+		$x = rsa_verify($signed_data,$sig_block['signature'],$key['public_key'],$algorithm);
+
+		logger('verified: ' . $x, LOGGER_DEBUG);
+
+		if(! $x)
+			return $result;
+
+		$result['portable_id'] = $key['portable_id'];
+		$result['header_valid'] = true;
+
+		if(in_array('digest',$signed_headers)) {
+			$result['content_signed'] = true;
+			$digest = explode('=', $headers['digest'], 2);
+			if($digest[0] === 'SHA-256')
+				$hashalg = 'sha256';
+			if($digest[0] === 'SHA-512')
+				$hashalg = 'sha512';
+
+			if(base64_encode(hash($hashalg,$body,true)) === $digest[1]) {
+				$result['content_valid'] = true;
+			}
+
+			logger('Content_Valid: ' . (($result['content_valid']) ? 'true' : 'false'));
+		}
+
+		return $result;
+	}
+
+	static function get_key($key,$id) {
+
+		if($key) {
+			if(function_exists($key)) {
+				return $key($id);
+			}
+			return [ 'public_key' => $key ];
+		}
+
+		$key = self::get_webfinger_key($id);
+
+		if(! $key) {
+			$key = self::get_activitystreams_key($id);
+		}
+
+		return $key;
+
+	}
+
+
+	function convertKey($key) {
+
+		if(strstr($key,'RSA ')) { 
+			return rsatopem($key);
+		}
+		elseif(substr($key,0,5) === 'data:') {
+			return convert_salmon_key($key);
+		}
+		else {
+			return $key;
+		}
+
+	}
+
+
+	/**
+	 * @brief
+	 *
+	 * @param string $id
+	 * @return boolean|string
+	 *   false if no pub key found, otherwise return the pub key
+	 */
+
+	function get_activitystreams_key($id) {
+
+		$x = q("select * from xchan left join hubloc on xchan_hash = hubloc_hash where hubloc_addr = '%s' or hubloc_id_url = '%s' limit 1",
+			dbesc(str_replace('acct:','',$id)),
+			dbesc($id)
+		);
+
+		if($x && $x[0]['xchan_pubkey']) {
+			return [ 'portable_id' => $x[0]['xchan_hash'], 'public_key' => $x[0]['xchan_pubkey'] , 'hubloc' => $x[0] ];
+		}
+
+		$r = ActivityStreams::fetch_property($id);
+
+		if($r) {
+			if(array_key_exists('publicKey',$j) && array_key_exists('publicKeyPem',$j['publicKey']) && array_key_exists('id',$j['publicKey'])) {
+				if($j['publicKey']['id'] === $id || $j['id'] === $id) {
+					return [ 'public_key' => self::convertKey($j['publicKey']['publicKeyPem']), 'portable_id' => '', 'hubloc' => [] ];
+				}
+			}
+		}
+
+		return false;
+	}
+
+
+	function get_webfinger_key($id) {
+
+		$x = q("select * from xchan left join hubloc on xchan_hash = hubloc_hash where hubloc_addr = '%s' or hubloc_id_url = '%s' limit 1",
+			dbesc(str_replace('acct:','',$id)),
+			dbesc($id)
+		);
+
+		if($x && $x[0]['xchan_pubkey']) {
+			return [ 'portable_id' => $x[0]['xchan_hash'], 'public_key' => $x[0]['xchan_pubkey'] , 'hubloc' => $x[0] ];
+		}
+
+		$wf = Webfinger::exec($id);
+		$key = [ 'portable_id' => '', 'public_key' => '', 'hubloc' => [] ];
+
+		if($wf) {
+		 	if(array_key_exists('properties',$wf) && array_key_exists('https://w3id.org/security/v1#publicKeyPem',$wf['properties'])) {
+				$key['public_key'] = self::convertKey($wf['properties']['https://w3id.org/security/v1#publicKeyPem']);
+			}
+			if(array_key_exists('links', $wf) && is_array($wf['links'])) {
+				foreach($wf['links'] as $l) {
+					if(! (is_array($l) && array_key_exists('rel',$l))) {
+						continue;
+					}
+					if($l['rel'] === 'magic-public-key' && array_key_exists('href',$l) && $key['public_key'] === EMPTY_STR) {
+						$key['public_key'] = self::convertKey($l['href']);
+					}
+				}
+			}
+		}
+
+		return (($key['public_key']) ? $key : false);
+	}
+
+
+	function get_zotfinger_key($id) {
+
+		$x = q("select * from xchan left join hubloc on xchan_hash = hubloc_hash where hubloc_addr = '%s' or hubloc_id_url = '%s' limit 1",
+			dbesc(str_replace('acct:','',$id)),
+			dbesc($id)
+		);
+		if($x && $x[0]['xchan_pubkey']) {
+			return [ 'portable_id' => $x[0]['xchan_hash'], 'public_key' => $x[0]['xchan_pubkey'] , 'hubloc' => $x[0] ];
+		}
+
+		$wf = Webfinger::exec($id);
+		$key = [ 'portable_id' => '', 'public_key' => '', 'hubloc' => [] ];
+
+		if($wf) {
+		 	if(array_key_exists('properties',$wf) && array_key_exists('https://w3id.org/security/v1#publicKeyPem',$wf['properties'])) {
+				$key['public_key'] = self::convertKey($wf['properties']['https://w3id.org/security/v1#publicKeyPem']);
+			}
+			if(array_key_exists('links', $wf) && is_array($wf['links'])) {
+				foreach($wf['links'] as $l) {
+					if(! (is_array($l) && array_key_exists('rel',$l))) {
+						continue;
+					}
+					if($l['rel'] === 'http://purl.org/zot/protocol/6.0' && array_key_exists('href',$l) && $l['href'] !== EMPTY_STR) {
+						$z = \Zotlabs\Lib\Zotfinger::exec($l['href']);
+						if($z) {
+							$i = Zotlabs\Lib\Libzot::import_xchan($z['data']);
+							if($i['success']) {
+								$key['portable_id'] = $i['hash'];
+
+								$x = q("select * from xchan left join hubloc on xchan_hash = hubloc_hash where hubloc_id_url = '%s' limit 1",
+									dbesc($l['href'])
+								);
+								if($x) {
+									$key['hubloc'] = $x[0];
+								}
+							}
+						}
+					}
+					if($l['rel'] === 'magic-public-key' && array_key_exists('href',$l) && $key['public_key'] === EMPTY_STR) {
+						$key['public_key'] = self::convertKey($l['href']);
+					}
+				}
+			}
+		}
+
+		return (($key['public_key']) ? $key : false);
+	}
+
+
+	/**
+	 * @brief
+	 *
+	 * @param array $head
+	 * @param string $prvkey
+	 * @param string $keyid (optional, default '')
+	 * @param boolean $auth (optional, default false)
+	 * @param string $alg (optional, default 'sha256')
+	 * @param array $encryption [ 'key', 'algorithm' ] or false
+	 * @return array
+	 */
+	static function create_sig($head, $prvkey, $keyid = EMPTY_STR, $auth = false, $alg = 'sha256', $encryption = false ) {
+
+		$return_headers = [];
+
+		if($alg === 'sha256') {
+			$algorithm = 'rsa-sha256';
+		}
+		if($alg === 'sha512') {
+			$algorithm = 'rsa-sha512';
+		}
+
+		$x = self::sign($head,$prvkey,$alg);
+
+		$headerval = 'keyId="' . $keyid . '",algorithm="' . $algorithm . '",headers="' . $x['headers'] . '",signature="' . $x['signature'] . '"';
+
+		if($encryption) {
+			$x = crypto_encapsulate($headerval,$encryption['key'],$encryption['algorithm']);
+			if(is_array($x)) {
+				$headerval = 'iv="' . $x['iv'] . '",key="' . $x['key'] . '",alg="' . $x['alg'] . '",data="' . $x['data'] . '"';
+			}
+		}
+
+		if($auth) {
+			$sighead = 'Authorization: Signature ' . $headerval;
+		}
+		else {
+			$sighead = 'Signature: ' . $headerval;
+		}
+
+		if($head) {
+			foreach($head as $k => $v) {
+				// strip the request-target virtual header from the output headers
+				if($k === '(request-target)') {
+					continue;
+				}
+				$return_headers[] = $k . ': ' . $v;
+			}
+		}
+		$return_headers[] = $sighead;
+
+		return $return_headers;
+	}
+
+	/**
+	 * @brief set headers
+	 *
+	 * @param array $headers
+	 * @return void
+	 */
+
+
+	static function set_headers($headers) {
+		if($headers && is_array($headers)) {
+			foreach($headers as $h) {
+				header($h);
+			}
+		} 
+	}
+
+
+	/**
+	 * @brief
+	 *
+	 * @param array  $head
+	 * @param string $prvkey
+	 * @param string $alg (optional) default 'sha256'
+	 * @return array
+	 */
+
+	static function sign($head, $prvkey, $alg = 'sha256') {
+
+		$ret = [];
+
+		$headers = '';
+		$fields  = '';
+
+		if($head) {
+			foreach($head as $k => $v) {
+				$headers .= strtolower($k) . ': ' . trim($v) . "\n";
+				if($fields)
+					$fields .= ' ';
+
+				$fields .= strtolower($k);
+			}
+			// strip the trailing linefeed
+			$headers = rtrim($headers,"\n");
+		}
+
+		$sig = base64_encode(rsa_sign($headers,$prvkey,$alg));
+
+		$ret['headers']   = $fields;
+		$ret['signature'] = $sig;
+
+		return $ret;
+	}
+
+	/**
+	 * @brief
+	 *
+	 * @param string $header
+	 * @return array associate array with
+	 *   - \e string \b keyID
+	 *   - \e string \b algorithm
+	 *   - \e array  \b headers
+	 *   - \e string \b signature
+	 */
+
+	static function parse_sigheader($header) {
+
+		$ret = [];
+		$matches = [];
+
+		// if the header is encrypted, decrypt with (default) site private key and continue
+
+		if(preg_match('/iv="(.*?)"/ism',$header,$matches))
+			$header = self::decrypt_sigheader($header);
+
+		if(preg_match('/keyId="(.*?)"/ism',$header,$matches))
+			$ret['keyId'] = $matches[1];
+		if(preg_match('/algorithm="(.*?)"/ism',$header,$matches))
+			$ret['algorithm'] = $matches[1];
+		if(preg_match('/headers="(.*?)"/ism',$header,$matches))
+			$ret['headers'] = explode(' ', $matches[1]);
+		if(preg_match('/signature="(.*?)"/ism',$header,$matches))
+			$ret['signature'] = base64_decode(preg_replace('/\s+/','',$matches[1]));
+
+		if(($ret['signature']) && ($ret['algorithm']) && (! $ret['headers']))
+			$ret['headers'] = [ 'date' ];
+
+ 		return $ret;
+	}
+
+
+	/**
+	 * @brief
+	 *
+	 * @param string $header
+	 * @param string $prvkey (optional), if not set use site private key
+	 * @return array|string associative array, empty string if failue
+	 *   - \e string \b iv
+	 *   - \e string \b key
+	 *   - \e string \b alg
+	 *   - \e string \b data
+	 */
+
+	static function decrypt_sigheader($header, $prvkey = null) {
+
+		$iv = $key = $alg = $data = null;
+
+		if(! $prvkey) {
+			$prvkey = get_config('system', 'prvkey');
+		}
+
+		$matches = [];
+
+		if(preg_match('/iv="(.*?)"/ism',$header,$matches))
+			$iv = $matches[1];
+		if(preg_match('/key="(.*?)"/ism',$header,$matches))
+			$key = $matches[1];
+		if(preg_match('/alg="(.*?)"/ism',$header,$matches))
+			$alg = $matches[1];
+		if(preg_match('/data="(.*?)"/ism',$header,$matches))
+			$data = $matches[1];
+
+		if($iv && $key && $alg && $data) {
+			return crypto_unencapsulate([ 'encrypted' => true, 'iv' => $iv, 'key' => $key, 'alg' => $alg, 'data' => $data ] , $prvkey);
+		}
+
+		return '';
+	}
+
+}