Running with softhsm2

Setup HSM keys and certificates

sudo apt install softhsm2
umask 077
mkdir -p ~/.config/softhsm2/tokens
echo "directories.tokendir = $HOME/.config/softhsm2/tokens/" > ~/.config/softhsm2/softhsm2.conf
cp docs/config.sample.yaml config.yaml
# modify config.yaml to fit your needs
softhsm2-util --init-token --free --label localhsm --so-pin 47110815 --pin 123456
# initialize the keys
export PKCS11_PIN_LOCALHSM=123456
go run ./cmd/signer -setup

Run the signer

export PKCS11_PIN_LOCALHSM=123456
go run ./cmd/signer

Run the client simulator with socat

You may run the client simulator that sends commands via stdout and reads responses on stdin via socat to simulate traffic on an emulated serial device:

sudo apt install socat

go build ./cmd/clientsim
socat -d -d -v pty,rawer,link=$(pwd)/testPty EXEC:./clientsim,pty,rawer

You will need to configure $(pwd)/testPty as serial/device in your config.yaml to let the signer command find the emulated serial device.