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tlstree.go
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tlstree.go
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// GoGOST -- Pure Go GOST cryptographic functions library
// Copyright (C) 2015-2019 Sergey Matveev <stargrave@stargrave.org>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package gost34112012256
import (
"encoding/binary"
)
type TLSTreeParams [3]uint64
var (
TLSGOSTR341112256WithMagmaCTROMAC TLSTreeParams = 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}),
}
TLSGOSTR341112256WithKuznyechikCTROMAC TLSTreeParams = 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}),
}
TLSGOSTR341112256WithKuznyechikMGML TLSTreeParams = 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}),
}
TLSGOSTR341112256WithMagmaMGML TLSTreeParams = 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}),
}
TLSGOSTR341112256WithKuznyechikMGMS TLSTreeParams = 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}),
}
TLSGOSTR341112256WithMagmaMGMS TLSTreeParams = 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 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])
kdf1 := NewKDF(t.keyRoot)
kdf2 := NewKDF(kdf1.Derive(t.key[:0], []byte("level1"), t.seq))
binary.BigEndian.PutUint64(t.seq, seqNum&t.params[1])
kdf3 := NewKDF(kdf2.Derive(t.key[:0], []byte("level2"), t.seq))
binary.BigEndian.PutUint64(t.seq, seqNum&t.params[2])
kdf3.Derive(t.key[:0], []byte("level3"), t.seq)
t.seqNumPrev = seqNum
return t.key, false
}
func (t *TLSTree) Derive(seqNum uint64) []byte {
keyDerived := make([]byte, Size)
key, _ := t.DeriveCached(seqNum)
copy(keyDerived, key)
return keyDerived
}