#!/bin/sh

filename=$1
if [ -z $filename ]; then
    echo "Usage: sign_file.sh filename [ keyfile ]"
    exit 1
fi
keybasename=$2
if [ -z $keybasename ]; then
    keybasename=key
    keybasename=`echo $keybasename|sed "s/\.[a-z]*$//"`
fi
# extract the pubkey, exponent, and priv key.
pq=`openssl asn1parse -in $keybasename.pvk | awk "NR==3"|cut -d: -f4`
e=`openssl asn1parse -in $keybasename.pvk | awk "NR==4"|cut -d: -f4`
d=`openssl asn1parse -in $keybasename.pvk | awk "NR==5"|cut -d: -f4`

if [ $e != "010001" ]; then
    echo error generating key, unexpected e value : $e
    exit 1
fi

msg=`./sha256.exe $filename`
echo "16 o 16 i $msg $d $pq |p"|dc|tr -d "\134\n" > $filename.sig