diff --git a/.gitignore b/.gitignore
index 782d329..bf6e2dd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 raspi*.img
 raspi*.log
 raspi*.tar.gz
+raspi*.sha256
 raspi_0w.yaml
 raspi_2.yaml
 raspi_3.yaml
diff --git a/Makefile b/Makefile
index 523578a..fcf27b7 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,8 @@
-yaml: raspi_0w.yaml raspi_2.yaml raspi_3.yaml
+all: shasums
+
+shasums: raspi_0w.sha256 raspi_2.sha256 raspi_3.sha256
 images: raspi_0w.img raspi_2.img raspi_3.img
+yaml: raspi_0w.yaml raspi_2.yaml raspi_3.yaml
 
 raspi_0w.yaml: raspi_master.yaml
 	cat raspi_master.yaml | sed "s/__ARCH__/armel/" | \
@@ -25,20 +28,13 @@ raspi_3.yaml: raspi_master.yaml
 	sed "s/__SPU_ENABLE__//" |\
 	sed "s/__HOST__/rpi3/" > $@
 
-raspi_0w.img : IMAGE=raspi_0w
-raspi_0w.img: raspi_0w.yaml _ck_root _build_img
+%.sha256: %.img
+	sha256sum $(@:sha256=img) $@ > $@
 
-raspi_2.img : IMAGE=raspi_2
-raspi_2.img: raspi_2.yaml _ck_root _build_img
-
-raspi_3.img : IMAGE=raspi_3
-raspi_3.img: raspi_3.yaml _ck_root _build_img
-
-_build_img:
-	[ ! -z "$(IMAGE)" ] # This target is not to be called directly
-	touch $(IMAGE).log
-	chmod 0644 $(IMAGE).log # Allow for non-root users to follow the build log
-	time nice vmdb2 --verbose --rootfs-tarball=$(IMAGE).tar.gz --output=$(IMAGE).img $(IMAGE).yaml --log $(IMAGE).log
+%.img: %.yaml
+	touch $(@:.img=.log)
+	time nice vmdb2 --verbose --rootfs-tarball=$(subst .img,.tar.gz,$@) --output=$@ $(subst .img,.yaml,$@) --log $(subst .img,.log,$@)
+	chmod 0644 $@ $(@,.img=.log)
 
 _ck_root:
 	[ `whoami` = 'root' ] # Only root can summon vmdb2 ☹
@@ -47,10 +43,12 @@ _clean_yaml:
 	rm -f raspi_0w.yaml raspi_2.yaml raspi_3.yaml
 _clean_images:
 	rm -f raspi_0w.img raspi_2.img raspi_3.img
+_clean_shasums:
+	rm -f raspi_0w.sha256 raspi_2.sha256 raspi_3.sha256
 _clean_logs:
 	rm -f raspi_0w.log raspi_2.log raspi_3.log
 _clean_tarballs:
 	rm -f raspi_0w.tar.gz raspi_2.tar.gz raspi_3.tar.gz
-clean: _clean_images _clean_yaml _clean_tarballs _clean_logs
+clean: _clean_images _clean_shasums _clean_yaml _clean_tarballs _clean_logs
 
 .PHONY: _ck_root _build_img clean _clean_images _clean_yaml _clean_tarballs _clean_logs