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|
package luksy
import (
"fmt"
"strings"
"syscall"
)
type V2Header [4096]uint8
const (
// Mostly verbatim from LUKS2 On-Disk Format Specification version 1.1.1
V2Magic1 = V1Magic
V2Magic2 = "SKUL\xba\xbe"
v2MagicStart = 0
v2MagicLength = 6
v2VersionStart = v2MagicStart + v2MagicLength
v2VersionLength = 2
v2HeaderSizeStart = v2VersionStart + v2VersionLength
v2HeaderSizeLength = 8
v2SequenceIDStart = v2HeaderSizeStart + v2HeaderSizeLength
v2SequenceIDLength = 8
v2LabelStart = v2SequenceIDStart + v2SequenceIDLength
v2LabelLength = 48
v2ChecksumAlgorithmStart = v2LabelStart + v2LabelLength
v2ChecksumAlgorithmLength = 32
v2SaltStart = v2ChecksumAlgorithmStart + v2ChecksumAlgorithmLength
v2SaltLength = 64
v2UUIDStart = v2SaltStart + v2SaltLength
v2UUIDLength = 40
v2SubsystemStart = v2UUIDStart + v2UUIDLength
v2SubsystemLength = v2LabelLength
v2HeaderOffsetStart = v2SubsystemStart + v2SubsystemLength
v2HeaderOffsetLength = 8
v2Padding1Start = v2HeaderOffsetStart + v2HeaderOffsetLength
v2Padding1Length = 184
v2ChecksumStart = v2Padding1Start + v2Padding1Length
v2ChecksumLength = 64
v2Padding4096Start = v2ChecksumStart + v2ChecksumLength
v2Padding4096Length = 7 * 512
v2HeaderStructSize = v2Padding4096Start + v2Padding4096Length
V2Stripes = 4000
V2AlignKeyslots = 4096
V2SectorSize = 4096
)
func (h V2Header) Magic() string {
return string(h[v2MagicStart : v2MagicStart+v2MagicLength])
}
func (h *V2Header) SetMagic(magic string) error {
switch magic {
case V2Magic1, V2Magic2:
copy(h[v2MagicStart:v2MagicStart+v2MagicLength], []uint8(magic))
return nil
}
return fmt.Errorf("magic %q not acceptable, only %q and %q are acceptable magic values: %w", magic, V2Magic1, V2Magic2, syscall.EINVAL)
}
func (h V2Header) readu2(offset int) uint16 {
t := uint16(0)
for i := 0; i < 2; i++ {
t = (t << 8) + uint16(h[offset+i])
}
return t
}
func (h V2Header) readu8(offset int) uint64 {
t := uint64(0)
for i := 0; i < 8; i++ {
t = (t << 8) + uint64(h[offset+i])
}
return t
}
func (h *V2Header) writeu2(offset int, value uint16) {
t := value
for i := 0; i < 2; i++ {
h[offset+1-i] = uint8(uint64(t) & 0xff)
t >>= 8
}
}
func (h *V2Header) writeu8(offset int, value uint64) {
t := value
for i := 0; i < 8; i++ {
h[offset+7-i] = uint8(uint64(t) & 0xff)
t >>= 8
}
}
func (h V2Header) Version() uint16 {
return h.readu2(v2VersionStart)
}
func (h *V2Header) SetVersion(version uint16) error {
switch version {
case 2:
h.writeu2(v2VersionStart, version)
return nil
}
return fmt.Errorf("version %d not acceptable, only 2 is an acceptable version: %w", version, syscall.EINVAL)
}
func (h V2Header) HeaderSize() uint64 {
return h.readu8(v2HeaderSizeStart)
}
func (h *V2Header) SetHeaderSize(size uint64) {
h.writeu8(v2HeaderSizeStart, size)
}
func (h V2Header) SequenceID() uint64 {
return h.readu8(v2SequenceIDStart)
}
func (h *V2Header) SetSequenceID(id uint64) {
h.writeu8(v2SequenceIDStart, id)
}
func trimZeroPad(s string) string {
return strings.TrimRightFunc(s, func(r rune) bool { return r == 0 })
}
func (h V2Header) Label() string {
return trimZeroPad(string(h[v2LabelStart : v2LabelStart+v2LabelLength]))
}
func (h *V2Header) setZeroString(offset int, value string, length int) {
for len(value) < length {
value = value + "\000"
}
copy(h[offset:offset+length], []uint8(value))
}
func (h *V2Header) SetLabel(label string) {
h.setZeroString(v2LabelStart, label, v2LabelLength)
}
func (h V2Header) ChecksumAlgorithm() string {
return trimZeroPad(string(h[v2ChecksumAlgorithmStart : v2ChecksumAlgorithmStart+v2ChecksumAlgorithmLength]))
}
func (h *V2Header) SetChecksumAlgorithm(alg string) {
h.setZeroString(v2ChecksumAlgorithmStart, alg, v2ChecksumAlgorithmLength)
}
func dupInt8(s []uint8) []uint8 {
c := make([]uint8, len(s))
copy(c, s)
return c
}
func (h *V2Header) setInt8(offset int, s []uint8, length int) {
t := make([]byte, length)
copy(t, s)
copy(h[offset:offset+length], t)
}
func (h V2Header) Salt() []uint8 {
return dupInt8(h[v2SaltStart : v2SaltStart+v2SaltLength])
}
func (h *V2Header) SetSalt(salt []uint8) {
h.setInt8(v2SaltStart, salt, v2SaltLength)
}
func (h V2Header) UUID() string {
return trimZeroPad(string(h[v2UUIDStart : v2UUIDStart+v2UUIDLength]))
}
func (h *V2Header) SetUUID(uuid string) {
h.setZeroString(v2UUIDStart, uuid, v2UUIDLength)
}
func (h V2Header) Subsystem() string {
return trimZeroPad(string(h[v2SubsystemStart : v2SubsystemStart+v2SubsystemLength]))
}
func (h *V2Header) SetSubsystem(ss string) {
h.setZeroString(v2SubsystemStart, ss, v2SubsystemLength)
}
func (h V2Header) HeaderOffset() uint64 {
return h.readu8(v2HeaderOffsetStart)
}
func (h *V2Header) SetHeaderOffset(o uint64) {
h.writeu8(v2HeaderOffsetStart, o)
}
func (h V2Header) Checksum() []uint8 {
hasher, err := hasherByName(h.ChecksumAlgorithm())
if err == nil {
return dupInt8(h[v2ChecksumStart : v2ChecksumStart+hasher().Size()])
}
return dupInt8(h[v2ChecksumStart : v2ChecksumStart+v2ChecksumLength])
}
func (h *V2Header) SetChecksum(sum []uint8) {
h.setInt8(v2ChecksumStart, sum, v2ChecksumLength)
}
|
