One-way trapdoor permutation for 840 bits based on RSA

Makefile

NEXT = openssl rsautl -decrypt -inkey key -raw

all: key
	openssl dgst -sha -out id -sign key key
	openssl dgst -sha -signature id -prverify key key

	while sleep 1; do \
		openssl base64 -in id; \
		$(NEXT) -in id -out next; \
		mv next id; \
	done

key:
	openssl genrsa -out key 840

clean:
	-rm -f key id next