#!/bin/bash

. lib.sh

#

# *** Description ***

#

# generate primary header with two exactly same areas in terms of 'offset' and 'length'.

#

# secondary header is corrupted on purpose as well

#

# $1 full target dir

# $2 full source luks2 image

function prepare()

{

	cp $SRC_IMG $TGT_IMG

	test -d $TMPDIR || mkdir $TMPDIR

	read_luks2_json0 $TGT_IMG $TMPDIR/json0

	read_luks2_bin_hdr0 $TGT_IMG $TMPDIR/hdr0

	read_luks2_bin_hdr1 $TGT_IMG $TMPDIR/hdr1

}

function generate()

{

	# copy area 6 offset and length into area 7

	json_str=$(jq -c '.keyslots."7".area.offset = .keyslots."6".area.offset |

	       .keyslots."7".area.size = .keyslots."6".area.size' $TMPDIR/json0)

	test ${#json_str} -lt $((LUKS2_JSON_SIZE*512)) || exit 2

	write_luks2_json "$json_str" $TMPDIR/json0

	merge_bin_hdr_with_json $TMPDIR/hdr0 $TMPDIR/json0 $TMPDIR/area0

	erase_checksum $TMPDIR/area0

	chks0=$(calc_sha256_checksum_file $TMPDIR/area0)

	write_checksum $chks0 $TMPDIR/area0

	write_luks2_hdr0 $TMPDIR/area0 $TGT_IMG

	kill_bin_hdr $TMPDIR/hdr1

	write_luks2_hdr1 $TMPDIR/hdr1 $TGT_IMG

}

function check()

{

	read_luks2_bin_hdr1 $TGT_IMG $TMPDIR/hdr_res1

	local str_res1=$(head -c 6 $TMPDIR/hdr_res1)

	test "$str_res1" = "VACUUM" || exit 2

	read_luks2_json0 $TGT_IMG $TMPDIR/json_res0

	jq -c 'if (.keyslots."6".area.offset != .keyslots."7".area.offset) or (.keyslots."6".area.size != .keyslots."7".area.size)

	       then error("Unexpected value in result json") else empty end' $TMPDIR/json_res0 || exit 5

}

function cleanup()

{

	rm -f $TMPDIR/*

	rm -fd $TMPDIR

}

test $# -eq 2 || exit 1

TGT_IMG=$1/$(test_img_name $0)

SRC_IMG=$2

prepare

generate

check

cleanup