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#!/bin/bash
# all in 512 bytes blocks (including binary hdr (4KiB))
LUKS2_HDR_SIZE=32 # 16 KiB
LUKS2_HDR_SIZE_32K=64 # 32 KiB
LUKS2_HDR_SIZE_64K=128 # 64 KiB
LUKS2_HDR_SIZE_128K=256 # 128 KiB
LUKS2_HDR_SIZE_256K=512 # 256 KiB
LUKS2_HDR_SIZE_512K=1024 # 512 KiB
LUKS2_HDR_SIZE_1M=2048 # 1 MiB
LUKS2_HDR_SIZE_2M=4096 # 2 MiB
LUKS2_HDR_SIZE_4M=8192 # 4 MiB
LUKS2_BIN_HDR_SIZE=8 # 4 KiB
LUKS2_JSON_SIZE=$((LUKS2_HDR_SIZE-LUKS2_BIN_HDR_SIZE))
LUKS2_BIN_HDR_CHKS_OFFSET=0x1C0
LUKS2_BIN_HDR_CHKS_LENGTH=64
[ -z "$srcdir" ] && srcdir="."
TMPDIR=$srcdir/tmp
repeat_str() {
printf "$1"'%.0s' $(eval "echo {1.."$(($2))"}");
}
function strindex()
{
local x="${1%%$2*}"
[[ $x = $1 ]] && echo -1 || echo ${#x}
}
function test_img_name()
{
local str=$(basename $1)
str=${str#generate-}
str=${str%%.sh}
echo $str
}
# read primary bin hdr
# 1:from 2:to
function read_luks2_bin_hdr0()
{
_dd if=$1 of=$2 bs=512 count=$LUKS2_BIN_HDR_SIZE
}
# read primary json area
# 1:from 2:to 3:[json only size (defaults to 12KiB)]
function read_luks2_json0()
{
local _js=${4:-$LUKS2_JSON_SIZE}
local _js=$((_js*512/4096))
_dd if=$1 of=$2 bs=4096 skip=1 count=$_js
}
# read secondary bin hdr
# 1:from 2:to 3:[metadata size (defaults to 16KiB)]
function read_luks2_bin_hdr1()
{
_dd if=$1 of=$2 skip=${3:-$LUKS2_HDR_SIZE} bs=512 count=$LUKS2_BIN_HDR_SIZE
}
# read secondary json area
# 1:from 2:to 3:[json only size (defaults to 12KiB)]
function read_luks2_json1()
{
local _js=${3:-$LUKS2_JSON_SIZE}
_dd if=$1 of=$2 bs=512 skip=$((2*LUKS2_BIN_HDR_SIZE+_js)) count=$_js
}
# read primary metadata area (bin + json)
# 1:from 2:to 3:[metadata size (defaults to 16KiB)]
function read_luks2_hdr_area0()
{
local _as=${3:-$LUKS2_HDR_SIZE}
local _as=$((_as*512))
_dd if=$1 of=$2 bs=$_as count=1
}
# read secondary metadata area (bin + json)
# 1:from 2:to 3:[metadata size (defaults to 16KiB)]
function read_luks2_hdr_area1()
{
local _as=${3:-$LUKS2_HDR_SIZE}
local _as=$((_as*512))
_dd if=$1 of=$2 bs=$_as skip=1 count=1
}
# write secondary bin hdr
# 1:from 2:to 3:[metadata size (defaults to 16KiB)]
function write_luks2_bin_hdr1()
{
_dd if=$1 of=$2 bs=512 seek=${3:-$LUKS2_HDR_SIZE} count=$LUKS2_BIN_HDR_SIZE conv=notrunc
}
# write primary metadata area (bin + json)
# 1:from 2:to 3:[metadata size (defaults to 16KiB)]
function write_luks2_hdr0()
{
local _as=${3:-$LUKS2_HDR_SIZE}
local _as=$((_as*512))
_dd if=$1 of=$2 bs=$_as count=1 conv=notrunc
}
# write secondary metadata area (bin + json)
# 1:from 2:to 3:[metadata size (defaults to 16KiB)]
function write_luks2_hdr1()
{
local _as=${3:-$LUKS2_HDR_SIZE}
local _as=$((_as*512))
_dd if=$1 of=$2 bs=$_as seek=1 count=1 conv=notrunc
}
# write json (includes padding)
# 1:json_string 2:to 3:[json size (defaults to 12KiB)]
function write_luks2_json()
{
local _js=${3:-$LUKS2_JSON_SIZE}
local len=${#1}
echo -n -E "$1" > $2
truncate -s $((_js*512)) $2
}
function kill_bin_hdr()
{
printf "VACUUM" | _dd of=$1 bs=1 conv=notrunc
}
function erase_checksum()
{
_dd if=/dev/zero of=$1 bs=1 seek=$(printf %d $LUKS2_BIN_HDR_CHKS_OFFSET) count=$LUKS2_BIN_HDR_CHKS_LENGTH conv=notrunc
}
function read_sha256_checksum()
{
_dd if=$1 bs=1 skip=$(printf %d $LUKS2_BIN_HDR_CHKS_OFFSET) count=32 | xxd -c 32 -p
}
# 1 - string with checksum
function write_checksum()
{
test $# -eq 2 || return 1
test $((${#1}/2)) -le $LUKS2_BIN_HDR_CHKS_LENGTH || { echo "too long"; return 1; }
echo $1 | xxd -r -p | _dd of=$2 bs=1 seek=$(printf %d $LUKS2_BIN_HDR_CHKS_OFFSET) conv=notrunc
}
function calc_sha256_checksum_file()
{
sha256sum $1 | cut -d ' ' -f 1
}
function calc_sha256_checksum_stdin()
{
sha256sum - | cut -d ' ' -f 1
}
# merge bin hdr with json to form metadata area
# 1:bin_hdr 2:json 3:to 4:[json size (defaults to 12KiB)]
function merge_bin_hdr_with_json()
{
local _js=${4:-$LUKS2_JSON_SIZE}
local _js=$((_js*512/4096))
_dd if=$1 of=$3 bs=4096 count=1
_dd if=$2 of=$3 bs=4096 seek=1 count=$_js
}
function _dd()
{
dd $@ status=none
}
function write_bin_hdr_size() {
printf '%016x' $2 | xxd -r -p -l 16 | _dd of=$1 bs=8 count=1 seek=1 conv=notrunc
}
function write_bin_hdr_offset() {
printf '%016x' $2 | xxd -r -p -l 16 | _dd of=$1 bs=8 count=1 seek=32 conv=notrunc
}
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