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tlstree.go
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tlstree.go
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package gost34112012256
import (
"encoding/binary"
)
var (
TLSMagmaCTROMAC = TLSTreeParams{
binary.BigEndian.Uint64([]byte{0xFF, 0xFF, 0xFF, 0xC0, 0x00, 0x00, 0x00, 0x00}),
binary.BigEndian.Uint64([]byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0x00, 0x00, 0x00}),
binary.BigEndian.Uint64([]byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF0, 0x00}),
}
TLSKuznyechikCTROMAC = TLSTreeParams{
binary.BigEndian.Uint64([]byte{0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00}),
binary.BigEndian.Uint64([]byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF8, 0x00, 0x00}),
binary.BigEndian.Uint64([]byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC0}),
}
TLSKuznyechikMGML = TLSTreeParams{
binary.BigEndian.Uint64([]byte{0xF8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}),
binary.BigEndian.Uint64([]byte{0xFF, 0xFF, 0xFF, 0xF0, 0x00, 0x00, 0x00, 0x00}),
binary.BigEndian.Uint64([]byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE0, 0x00}),
}
TLSMagmaMGML = TLSTreeParams{
binary.BigEndian.Uint64([]byte{0xFF, 0xE0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}),
binary.BigEndian.Uint64([]byte{0xFF, 0xFF, 0xFF, 0xFF, 0xC0, 0x00, 0x00, 0x00}),
binary.BigEndian.Uint64([]byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x80}),
}
TLSKuznyechikMGMS = TLSTreeParams{
binary.BigEndian.Uint64([]byte{0xFF, 0xFF, 0xFF, 0xFF, 0xE0, 0x00, 0x00, 0x00}),
binary.BigEndian.Uint64([]byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00}),
binary.BigEndian.Uint64([]byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF8}),
}
TLSMagmaMGMS = TLSTreeParams{
binary.BigEndian.Uint64([]byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFC, 0x00, 0x00, 0x00}),
binary.BigEndian.Uint64([]byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE0, 0x00}),
binary.BigEndian.Uint64([]byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}),
}
)
type TLSTreeParams [3]uint64
type TLSTree struct {
params TLSTreeParams
keyRoot []byte
seqNumPrev uint64
seq []byte
key []byte
}
func NewTLSTree(params TLSTreeParams, keyRoot []byte) *TLSTree {
key := make([]byte, len(keyRoot))
copy(key, keyRoot)
return &TLSTree{
params: params,
keyRoot: key,
seq: make([]byte, 8),
key: make([]byte, Size),
}
}
func (t *TLSTree) DeriveCached(seqNum uint64) ([]byte, bool) {
if seqNum > 0 &&
(seqNum&t.params[0]) == ((t.seqNumPrev)&t.params[0]) &&
(seqNum&t.params[1]) == ((t.seqNumPrev)&t.params[1]) &&
(seqNum&t.params[2]) == ((t.seqNumPrev)&t.params[2]) {
return t.key, true
}
binary.BigEndian.PutUint64(t.seq, seqNum&t.params[0])
pass1 := KDF(New, t.keyRoot, []byte("level1"), t.seq)
binary.BigEndian.PutUint64(t.seq, seqNum&t.params[1])
pass2 := KDF(New, pass1, []byte("level2"), t.seq)
binary.BigEndian.PutUint64(t.seq, seqNum&t.params[2])
pass3 := KDF(New, pass2, []byte("level3"), t.seq)
t.seqNumPrev = seqNum
t.key = pass3
return t.key, false
}
func (t *TLSTree) Derive(seqNum uint64) []byte {
key, _ := t.DeriveCached(seqNum)
keyDerived := make([]byte, Size)
copy(keyDerived, key)
return keyDerived
}