#!/bin/sh
#
#  Copyright (c) 2010 Samuel Lidén Borell <samuel@kodafritt.se>
#
#  Permission is hereby granted, free of charge, to any person obtaining a copy
#  of this software and associated documentation files (the "Software"), to deal
#  in the Software without restriction, including without limitation the rights
#  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
#  copies of the Software, and to permit persons to whom the Software is
#  furnished to do so, subject to the following conditions:
#  
#  The above copyright notice and this permission notice shall be included in
#  all copies or substantial portions of the Software.
#  
#  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
#  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
#  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
#  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
#  THE SOFTWARE.
#

if [ x"$#" != x1 ]; then
    echo "Usage: asn1dump filename

This program dumps the ASN1 structure and contents of a file. It will create
textual and binary dumps of the file in the current directory.
(currently $PWD).

Individual \"blobs\" in the file are dumped to filename.1.2.3.4.bin/txt. Each
such text file is appended to all.txt, and structure.txt which is filtered
to not contain number sequences (such as keys and personal numbers).
" >&2
    exit 2
fi

BASE="`basename "$1"`"
BASE="${BASE%.bin}"
BASE="${BASE%.ngp}"
BASE="${BASE%.nge}"
BASE="${BASE%.p12}"
OUT="$BASE.txt"

ASN1DUMP_IS_CALLEE="$ASN1DUMP_INNER"
if [ -z "$ASN1DUMP_IS_CALLEE" ]; then
    # Start with empty all.txt and structure.txt files
    printf "" > all.txt
    printf "" > structure.txt
fi
export ASN1DUMP_INNER=1

openssl asn1parse -inform DER -in "$1" > "$OUT" || { rm "$OUT"; exit 1; }
cat "$OUT" >> all.txt
# Remove keys, personal numbers, etc.
sed -r 's/[0-9a-fA-F]{11,}/[hidden]/g' "$OUT" >> structure.txt

# TODO Use "openssl asn1parse -strparse" instead?
i=1
prefix='[^:]*:[^:]*: OCTET STRING      \[HEX DUMP\]:'
grep -E "$prefix" "$OUT" | sed s/"$prefix"// | while read line; do
    printf "%s" "$line" | xxd -r -p > "$BASE.$i.bin"
    "$0" "$BASE.$i.bin" || true
    i=$((i+1))
done

if [ -z "$ASN1DUMP_IS_CALLEE" ]; then
    printf "\nAny error messages above can most likely be ignored.\n"
fi