➜ ./main.py --help
Usage: main.py {gen-keys,sign,verify} <args> [options]
RSA command line tool
Options:
-h, --help show this help message and exit
-b BITS, --bits=BITS number of bits for key generation [default=1024]
➜ cat test_hello_world.txt
Hello World!
➜ ./main.py gen-keys
➜ ./main.py sign test_hello_world.txt key_private.pem signed_hello_world.txt
➜ ./main.py verify test_hello_world.txt signed_hello_world.txt key_public.pem
VALID