#!/bin/sh
# author: itsme@xs4all.nl

bits=$1
if [ -z $bits ]; then
    echo "Usage: create_new_key.sh nr_of_bits [keyfilename]"
    echo "       default: public key:  key.pub"
    echo "                private key: key.pvk"
    exit 1
fi
keybasename=$2
if [ -z $keybasename ]; then
    keybasename=key
    keybasename=`echo $keybasename|sed "s/\.[a-z]*$//"`
fi
#  generate a rsa key  ( needs to be more than 256 bits )
openssl genrsa -f4 -out $keybasename.pvk $bits

# 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`

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