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|
package luksy
import (
"encoding/binary"
"fmt"
"syscall"
)
type (
V1Header [592]uint8
V1KeySlot [48]uint8
)
const (
// Mostly verbatim from LUKS1 On-Disk Format Specification version 1.2.3
V1Magic = "LUKS\xba\xbe"
v1MagicStart = 0
v1MagicLength = 6
v1VersionStart = v1MagicStart + v1MagicLength
v1VersionLength = 2
v1CipherNameStart = v1VersionStart + v1VersionLength
v1CipherNameLength = 32
v1CipherModeStart = v1CipherNameStart + v1CipherNameLength
v1CipherModeLength = 32
v1HashSpecStart = v1CipherModeStart + v1CipherModeLength
v1HashSpecLength = 32
v1PayloadOffsetStart = v1HashSpecStart + v1HashSpecLength
v1PayloadOffsetLength = 4
v1KeyBytesStart = v1PayloadOffsetStart + v1PayloadOffsetLength
v1KeyBytesLength = 4
v1MKDigestStart = v1KeyBytesStart + v1KeyBytesLength
v1MKDigestLength = v1DigestSize
v1MKDigestSaltStart = v1MKDigestStart + v1MKDigestLength
v1MKDigestSaltLength = v1SaltSize
v1MKDigestIterStart = v1MKDigestSaltStart + v1MKDigestSaltLength
v1MKDigestIterLength = 4
v1UUIDStart = v1MKDigestIterStart + v1MKDigestIterLength
v1UUIDLength = 40
v1KeySlot1Start = v1UUIDStart + v1UUIDLength
v1KeySlot1Length = 48
v1KeySlot2Start = v1KeySlot1Start + v1KeySlot1Length
v1KeySlot2Length = 48
v1KeySlot3Start = v1KeySlot2Start + v1KeySlot2Length
v1KeySlot3Length = 48
v1KeySlot4Start = v1KeySlot3Start + v1KeySlot3Length
v1KeySlot4Length = 48
v1KeySlot5Start = v1KeySlot4Start + v1KeySlot4Length
v1KeySlot5Length = 48
v1KeySlot6Start = v1KeySlot5Start + v1KeySlot5Length
v1KeySlot6Length = 48
v1KeySlot7Start = v1KeySlot6Start + v1KeySlot6Length
v1KeySlot7Length = 48
v1KeySlot8Start = v1KeySlot7Start + v1KeySlot7Length
v1KeySlot8Length = 48
v1HeaderStructSize = v1KeySlot8Start + v1KeySlot8Length
v1KeySlotActiveStart = 0
v1KeySlotActiveLength = 4
v1KeySlotIterationsStart = v1KeySlotActiveStart + v1KeySlotActiveLength
v1KeySlotIterationsLength = 4
v1KeySlotSaltStart = v1KeySlotIterationsStart + v1KeySlotIterationsLength
v1KeySlotSaltLength = v1SaltSize
v1KeySlotKeyMaterialOffsetStart = v1KeySlotSaltStart + v1KeySlotSaltLength
v1KeySlotKeyMaterialOffsetLength = 4
v1KeySlotStripesStart = v1KeySlotKeyMaterialOffsetStart + v1KeySlotKeyMaterialOffsetLength
v1KeySlotStripesLength = 4
v1KeySlotStructSize = v1KeySlotStripesStart + v1KeySlotStripesLength
v1DigestSize = 20
v1SaltSize = 32
v1NumKeys = 8
v1KeySlotActiveKeyDisabled = 0x0000dead
v1KeySlotActiveKeyEnabled = 0x00ac71f3
V1Stripes = 4000
V1AlignKeyslots = 4096
V1SectorSize = 512
)
func (h V1Header) readu2(offset int) uint16 {
return binary.BigEndian.Uint16(h[offset:])
}
func (h V1Header) readu4(offset int) uint32 {
return binary.BigEndian.Uint32(h[offset:])
}
func (h *V1Header) writeu2(offset int, value uint16) {
binary.BigEndian.PutUint16(h[offset:], value)
}
func (h *V1Header) writeu4(offset int, value uint32) {
binary.BigEndian.PutUint32(h[offset:], value)
}
func (h V1Header) Magic() string {
return trimZeroPad(string(h[v1MagicStart : v1MagicStart+v1MagicLength]))
}
func (h *V1Header) SetMagic(magic string) error {
switch magic {
case V1Magic:
copy(h[v1MagicStart:v1MagicStart+v1MagicLength], []uint8(magic))
return nil
}
return fmt.Errorf("magic %q not acceptable, only %q is an acceptable magic value: %w", magic, V1Magic, syscall.EINVAL)
}
func (h V1Header) Version() uint16 {
return h.readu2(v1VersionStart)
}
func (h *V1Header) SetVersion(version uint16) error {
switch version {
case 1:
h.writeu2(v1VersionStart, version)
return nil
}
return fmt.Errorf("version %d not acceptable, only 1 is an acceptable version: %w", version, syscall.EINVAL)
}
func (h *V1Header) setZeroString(offset int, value string, length int) {
for len(value) < length {
value = value + "\000"
}
copy(h[offset:offset+length], []uint8(value))
}
func (h *V1Header) setInt8(offset int, s []uint8, length int) {
t := make([]byte, length)
copy(t, s)
copy(h[offset:offset+length], s)
}
func (h V1Header) CipherName() string {
return trimZeroPad(string(h[v1CipherNameStart : v1CipherNameStart+v1CipherNameLength]))
}
func (h *V1Header) SetCipherName(name string) {
h.setZeroString(v1CipherNameStart, name, v1CipherNameLength)
}
func (h V1Header) CipherMode() string {
return trimZeroPad(string(h[v1CipherModeStart : v1CipherModeStart+v1CipherModeLength]))
}
func (h *V1Header) SetCipherMode(mode string) {
h.setZeroString(v1CipherModeStart, mode, v1CipherModeLength)
}
func (h V1Header) HashSpec() string {
return trimZeroPad(string(h[v1HashSpecStart : v1HashSpecStart+v1HashSpecLength]))
}
func (h *V1Header) SetHashSpec(spec string) {
h.setZeroString(v1HashSpecStart, spec, v1HashSpecLength)
}
func (h V1Header) PayloadOffset() uint32 {
return h.readu4(v1PayloadOffsetStart)
}
func (h *V1Header) SetPayloadOffset(offset uint32) {
h.writeu4(v1PayloadOffsetStart, offset)
}
func (h V1Header) KeyBytes() uint32 {
return h.readu4(v1KeyBytesStart)
}
func (h *V1Header) SetKeyBytes(bytes uint32) {
h.writeu4(v1KeyBytesStart, bytes)
}
func (h *V1Header) KeySlot(slot int) (V1KeySlot, error) {
var ks V1KeySlot
if slot < 0 || slot >= v1NumKeys {
return ks, fmt.Errorf("invalid key slot number (must be 0..%d)", v1NumKeys-1)
}
switch slot {
case 0:
copy(ks[:], h[v1KeySlot1Start:v1KeySlot1Start+v1KeySlot1Length])
case 1:
copy(ks[:], h[v1KeySlot2Start:v1KeySlot2Start+v1KeySlot2Length])
case 2:
copy(ks[:], h[v1KeySlot3Start:v1KeySlot3Start+v1KeySlot3Length])
case 3:
copy(ks[:], h[v1KeySlot4Start:v1KeySlot4Start+v1KeySlot4Length])
case 4:
copy(ks[:], h[v1KeySlot5Start:v1KeySlot5Start+v1KeySlot5Length])
case 5:
copy(ks[:], h[v1KeySlot6Start:v1KeySlot6Start+v1KeySlot6Length])
case 6:
copy(ks[:], h[v1KeySlot7Start:v1KeySlot7Start+v1KeySlot7Length])
case 7:
copy(ks[:], h[v1KeySlot8Start:v1KeySlot8Start+v1KeySlot8Length])
}
return ks, nil
}
func (h *V1Header) SetKeySlot(slot int, ks V1KeySlot) error {
if slot < 0 || slot >= v1NumKeys {
return fmt.Errorf("invalid key slot number (must be 0..%d)", v1NumKeys-1)
}
switch slot {
case 0:
copy(h[v1KeySlot1Start:v1KeySlot1Start+v1KeySlot1Length], ks[:])
case 1:
copy(h[v1KeySlot2Start:v1KeySlot2Start+v1KeySlot2Length], ks[:])
case 2:
copy(h[v1KeySlot3Start:v1KeySlot3Start+v1KeySlot3Length], ks[:])
case 3:
copy(h[v1KeySlot4Start:v1KeySlot4Start+v1KeySlot4Length], ks[:])
case 4:
copy(h[v1KeySlot5Start:v1KeySlot5Start+v1KeySlot5Length], ks[:])
case 5:
copy(h[v1KeySlot6Start:v1KeySlot6Start+v1KeySlot6Length], ks[:])
case 6:
copy(h[v1KeySlot7Start:v1KeySlot7Start+v1KeySlot7Length], ks[:])
case 7:
copy(h[v1KeySlot8Start:v1KeySlot8Start+v1KeySlot8Length], ks[:])
}
return nil
}
func (h V1Header) MKDigest() []uint8 {
return dupInt8(h[v1MKDigestStart : v1MKDigestStart+v1MKDigestLength])
}
func (h *V1Header) SetMKDigest(digest []uint8) {
h.setInt8(v1MKDigestStart, digest, v1MKDigestLength)
}
func (h V1Header) MKDigestSalt() []uint8 {
return dupInt8(h[v1MKDigestSaltStart : v1MKDigestSaltStart+v1MKDigestSaltLength])
}
func (h *V1Header) SetMKDigestSalt(salt []uint8) {
h.setInt8(v1MKDigestSaltStart, salt, v1MKDigestSaltLength)
}
func (h V1Header) MKDigestIter() uint32 {
return h.readu4(v1MKDigestIterStart)
}
func (h *V1Header) SetMKDigestIter(bytes uint32) {
h.writeu4(v1MKDigestIterStart, bytes)
}
func (h V1Header) UUID() string {
return trimZeroPad(string(h[v1UUIDStart : v1UUIDStart+v1UUIDLength]))
}
func (h *V1Header) SetUUID(uuid string) {
h.setZeroString(v1UUIDStart, uuid, v1UUIDLength)
}
func (s V1KeySlot) readu4(offset int) uint32 {
return binary.BigEndian.Uint32(s[offset:])
}
func (s *V1KeySlot) writeu4(offset int, value uint32) {
binary.BigEndian.PutUint32(s[offset:], value)
}
func (s *V1KeySlot) setInt8(offset int, i []uint8, length int) {
for len(s) < length {
i = append(i, 0)
}
copy(s[offset:offset+length], i)
}
func (s V1KeySlot) Active() (bool, error) {
active := s.readu4(v1KeySlotActiveStart)
switch active {
case v1KeySlotActiveKeyDisabled:
return false, nil
case v1KeySlotActiveKeyEnabled:
return true, nil
}
return false, fmt.Errorf("got invalid active value %#0x: %w", active, syscall.EINVAL)
}
func (s *V1KeySlot) SetActive(active bool) {
if active {
s.writeu4(v1KeySlotActiveStart, v1KeySlotActiveKeyEnabled)
return
}
s.writeu4(v1KeySlotActiveStart, v1KeySlotActiveKeyDisabled)
}
func (s V1KeySlot) Iterations() uint32 {
return s.readu4(v1KeySlotIterationsStart)
}
func (s *V1KeySlot) SetIterations(iterations uint32) {
s.writeu4(v1KeySlotIterationsStart, iterations)
}
func (s V1KeySlot) KeySlotSalt() []uint8 {
return dupInt8(s[v1KeySlotSaltStart : v1KeySlotSaltStart+v1KeySlotSaltLength])
}
func (s *V1KeySlot) SetKeySlotSalt(salt []uint8) {
s.setInt8(v1KeySlotSaltStart, salt, v1KeySlotSaltLength)
}
func (s V1KeySlot) KeyMaterialOffset() uint32 {
return s.readu4(v1KeySlotKeyMaterialOffsetStart)
}
func (s *V1KeySlot) SetKeyMaterialOffset(material uint32) {
s.writeu4(v1KeySlotKeyMaterialOffsetStart, material)
}
func (s V1KeySlot) Stripes() uint32 {
return s.readu4(v1KeySlotStripesStart)
}
func (s *V1KeySlot) SetStripes(stripes uint32) {
s.writeu4(v1KeySlotStripesStart, stripes)
}
|
