Not all rpms seem to have SHA256HEADER.

lib/dnf-plugins/rpm2swidtag.py

@@ -70,7 +70,10 @@ def run(self):
 						tags = s.tags_for_rpm_packages(pkgs)
 
 						remaining_pkgs = []
-						for p in tags:
+						for p in pkgs:
+							if p not in tags:
+								remaining_pkgs.append(p)
+								continue
 							found = False
 							for d in tags[p]:
 								full_d = path.join(self.plugin.dir_downloaded, d)

lib/rpm2swidtag/repodata.py

@@ -162,7 +162,8 @@ def tags_for_repo_packages(self, pkgs):
 	def tags_for_rpm_packages(self, pkgs):
 		pkg256headers = {}
 		for p in pkgs:
-			pkg256headers[( p["name"].decode("utf-8"), p["SHA256HEADER"].decode("utf-8") )] = p
+			if p["SHA256HEADER"]:
+				pkg256headers[( p["name"].decode("utf-8"), p["SHA256HEADER"].decode("utf-8") )] = p
 		tags = {}
 		for e in self.xml.xpath("/swidtags:metadata/swidtags:package", namespaces = { "swidtags": SWIDTAGLIST_XMLNS }):
 			found = None

setup.py

@@ -7,7 +7,7 @@
 
 setup(
 	name = 'rpm2swidtag',
-	version = '0.6.3',
+	version = '0.6.4',
 	description = 'Tools for producing SWID tags from rpm package headers and inspecting the SWID tags',
 	author = 'Jan Pazdziora',
 	author_email = '[email protected]',