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#!/bin/bash
set -eu
# This script uses tkey-runapp to load a signer app which has been built with
# the touch requirement removed. Then it runs tkey-sign forever, signing 512
# bytes of new random data on every iteration.
#
# The script expects that the TKey is in firmware mode, so it can load the
# correct signer app.
#
# Arguments to this script will be passed to tkey-runapp and tkey-sign, so
# --port and --speed can be used.
#
# If the environment variable USB_DEVICE is set, --port $USB_DEVICE is passed
# to these programs.
cd "${0%/*}/.."
if [[ -e tkey-sign ]]; then
if ! go version -m tkey-sign | grep -q main.signerAppNoTouch=indeed; then
printf "We need to build with the touch requirement removed.\n"
printf "Please first do: make -C ../ clean\n"
exit 1
fi
fi
make TKEY_SIGNER_APP_NO_TOUCH=indeed -C apps
make TKEY_SIGNER_APP_NO_TOUCH=indeed tkey-runapp tkey-sign
if [[ -n "${USB_DEVICE:-}" ]]; then
# Passing this last to make it override
set -- "$@" --port "$USB_DEVICE"
fi
# We expect to load the app ourselves, exiting if we couldn't
if ! ./tkey-runapp "$@" apps/signer/app.bin; then
exit 1
fi
msgf=$(mktemp)
cleanup() {
rm -f "$msgf"
}
trap cleanup EXIT
c=0
start=$(date +%s)
while true; do
# 512 bytes becomes 1 msg with 511 bytes and 1 msg with 1 byte
dd 2>/dev/null if=/dev/urandom of="$msgf" bs=512 count=1
if ! ./tkey-sign "$@" "$msgf"; then
exit 1
fi
c=$(( c+1 ))
now=$(date +%s)
printf "loop count: %d, seconds passed: %d\n" "$c" "$((now - start))"
done
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