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#!/bin/bash
. lib.sh
#
# *** Description ***
#
# generate primary with predefined json_size. There's only limited
# set of values allowed as json size in config section of LUKS2
# metadata
#
# secondary header is corrupted on purpose as well
#
# $1 full target dir
# $2 full source luks2 image
function generate()
{
# 2 MiB metadata
TEST_MDA_SIZE=$LUKS2_HDR_SIZE_2M
TEST_MDA_SIZE_BYTES=$((TEST_MDA_SIZE*512))
TEST_JSN_SIZE=$((TEST_MDA_SIZE-LUKS2_BIN_HDR_SIZE))
KEYSLOTS_OFFSET=$((TEST_MDA_SIZE*1024))
JSON_DIFF=$(((TEST_MDA_SIZE-LUKS2_HDR_SIZE)*1024))
JSON_SIZE=$((TEST_JSN_SIZE*512))
DATA_OFFSET=16777216
json_str=$(jq -c --arg jdiff $JSON_DIFF --arg jsize $JSON_SIZE --arg off $DATA_OFFSET \
'.keyslots[].area.offset |= ( . | tonumber + ($jdiff | tonumber) | tostring) |
.config.json_size = $jsize |
.segments."0".offset = $off' $TMPDIR/json0)
test -n "$json_str" || exit 2
test ${#json_str} -lt $((LUKS2_JSON_SIZE*512)) || exit 2
write_luks2_json "$json_str" $TMPDIR/json0 $TEST_JSN_SIZE
write_luks2_json "$json_str" $TMPDIR/json1 $TEST_JSN_SIZE
write_bin_hdr_size $TMPDIR/hdr0 $TEST_MDA_SIZE_BYTES
write_bin_hdr_size $TMPDIR/hdr1 $TEST_MDA_SIZE_BYTES
lib_mangle_json_hdr0 $TEST_MDA_SIZE $TEST_JSN_SIZE
lib_mangle_json_hdr1 $TEST_MDA_SIZE $TEST_JSN_SIZE kill
}
function check()
{
lib_hdr1_killed $TEST_MDA_SIZE || exit 2
read_luks2_json0 $TGT_IMG $TMPDIR/json_res0 $TEST_JSN_SIZE
jq -c --arg koff $KEYSLOTS_OFFSET --arg jsize $JSON_SIZE \
'if ([.keyslots[].area.offset] | map(tonumber) | min | tostring != $koff) or
(.config.json_size != $jsize)
then error("Unexpected value in result json") else empty end' $TMPDIR/json_res0 || exit 5
}
lib_prepare $@
generate
check
lib_cleanup
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