#!/bin/bash

if [ $# -lt 2 ]
then
  echo "Usage: ./`basename $0` HASHUTIL PUBKEY.TXT < ENCODED.TXT > HEXPAYLOAD"
  exit 1
fi

bits=""
while read -u 3 pkl; do
    if ! read el
    then
        break
    fi
    bits="$bits$(
        case $(echo -n $el | xxd -r -p | $1 | cut -d ' ' -f1) in
            $(echo $pkl | cut -d ' ' -f1)) echo "0" ;;
            $(echo $pkl | cut -d ' ' -f2)) echo "1" ;;
            *) exit 1; break ;;
            esac)"
    if [[ $? == 1 ]]
    then
        echo False >&2;
        exit 1
    fi
done 3<$2

echo "ibase=2;obase=10000;$bits" | bc  | tr -d '\\\n' | tr '[:upper:]' '[:lower:]'
echo