sms-signature

#!/usr/bin/env bash

command -v keytool >/dev/null 2>&1 || { echo >&2 "I require keytool but it's not installed."; exit 1; }
command -v sha256sum >/dev/null 2>&1 || { echo >&2 "I require sha256sum but it's not installed."; exit 1; }

keystore=${1}
alias=${2}
application=${3}

keytool -exportcert -alias ${alias} -keystore ${keystore} | xxd -p | tr -d "[:space:]" | echo -n ${application} `cat` | sha256sum | tr -d "[:space:]-" | xxd -r -p | base64 | cut -c1-11