pkcrypt
public key crypto
python3 -m pkcrypt genpair >p ; echo $?
# the first line is your public key
# the second line is your private key
python3 -m pkcrypt sign p -h <Makefile >s2 ; echo $?
python3 -m pkcrypt verify p <s2 ; echo $?
echo TEST MESSAGE | python -m pkcrypt sign p -s -h | python -m pkcrypt verify -s