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#!/bin/bash -e
#
# Purpose: Convert a .zip file into a .nex file for Opera
# Adapted from
dir=$PWD
zip="$PWD/$1"
nex="$PWD/$2"
key=$3
pub="tmp.pub"
sig="tmp.sig"
trap 'rm -f "$pub" "$sig" "$zip"' EXIT
# signature
openssl sha1 -sha1 -binary -sign "$key" < "$zip" > "$sig"
# public key
openssl rsa -pubout -outform DER < "$key" > "$pub" 2>/dev/null
byte_swap () {
# Take "abcdefgh" and return it as "ghefcdab"
echo "${1:6:2}${1:4:2}${1:2:2}${1:0:2}"
}
crmagic_hex="4372 3234" # Cr24
version_hex="0200 0000" # 2
pub_len_hex=$(byte_swap $(printf '%08x\n' $(ls -l "$pub" | awk '{print $5}')))
sig_len_hex=$(byte_swap $(printf '%08x\n' $(ls -l "$sig" | awk '{print $5}')))
(
echo "$crmagic_hex $version_hex $pub_len_hex $sig_len_hex" | xxd -r -p
cat "$pub" "$sig" "$zip"
) > "$nex"
echo "Wrote $nex"
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