Using md5sum(check) and a python script(update) for md5 verification.

I would use md5sum for both check and update but getting the Makefile globbing right is a PiTA.

mk/example.mk

@@ -1,16 +1,20 @@
 EXEC = $(shell basename $(CURDIR))
 
+.PHONY: all
 all:
 	go build
 
+.PHONY: test
 test: all
 	./$(EXEC)
-	cd $(TOP)/tools/md5tool; make
-	$(TOP)/tools/md5tool/md5tool
+	if [ -f MD5SUM ]; then md5sum -c MD5SUM; fi;
 
-update-md5sums:
-	$(TOP)/tools/md5tool/md5tool -update
+.PHONY: hash
+hash: all
+	./$(EXEC)
+	$(TOP)/tools/md5tool.py > MD5SUM
 
+.PHONY: clean
 clean:
 	go clean
 	-rm -f *.svg

tools/md5tool.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+
+import glob
+import hashlib
+
+def md5sum(filename):
+  with open(filename, mode='rb') as f:
+    d = hashlib.md5()
+    while True:
+      buf = f.read(8192)
+      if not buf:
+        break
+      d.update(buf)
+    return d.hexdigest()
+
+def main():
+  f = []
+  for ext in ("stl","svg","dxf","png"):
+    f.extend(glob.glob('*.%s' % ext))
+  for fname in f:
+    print("%s\t%s" % (md5sum(fname), fname))
+
+main()