qemu-img create -f luks \
--object secret,id=encrypt2.img_encrypt0,file=/path/to/secretFile \
-o key-secret=encrypt2.img_encrypt0 \
/var/lib/libvirt/images/encrypt2.img 5242880K
qemu-img convert --image-opts -n --target-image-opts \
--object secret,id=encrypt2.img_encrypt0,file=/path/to/secretFile \
--object secret,id=encrypt1.img_encrypt0,file=/path/to/inputSecretFile \
driver=luks,file.filename=/var/lib/libvirt/images/encrypt1.img,\
key-secret=encrypt1.img_encrypt0 \
driver=luks,file.filename=/var/lib/libvirt/images/encrypt2.img,\
key-secret=encrypt2.img_encrypt0