+++ /dev/null
-// 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, version 3 of the License.
-//
-// 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/>.
-
-// GOST 34.12-2015 64-bit (Магма (Magma)) block cipher.
-package gost341264
-
-import (
- "cypherpunks.ru/gogost/gost28147"
-)
-
-const (
- BlockSize = 8
- KeySize = 32
-)
-
-type Cipher struct {
- c *gost28147.Cipher
- blk *[BlockSize]byte
-}
-
-func NewCipher(key []byte) *Cipher {
- if len(key) != KeySize {
- panic("invalid key size")
- }
- keyCompatible := make([]byte, KeySize)
- for i := 0; i < KeySize/4; i++ {
- keyCompatible[i*4+0] = key[i*4+3]
- keyCompatible[i*4+1] = key[i*4+2]
- keyCompatible[i*4+2] = key[i*4+1]
- keyCompatible[i*4+3] = key[i*4+0]
- }
- return &Cipher{
- c: gost28147.NewCipher(keyCompatible, &gost28147.SboxIdtc26gost28147paramZ),
- blk: new([BlockSize]byte),
- }
-}
-
-func (c *Cipher) BlockSize() int {
- return BlockSize
-}
-
-func (c *Cipher) Encrypt(dst, src []byte) {
- c.blk[0] = src[7]
- c.blk[1] = src[6]
- c.blk[2] = src[5]
- c.blk[3] = src[4]
- c.blk[4] = src[3]
- c.blk[5] = src[2]
- c.blk[6] = src[1]
- c.blk[7] = src[0]
- c.c.Encrypt(c.blk[:], c.blk[:])
- dst[0] = c.blk[7]
- dst[1] = c.blk[6]
- dst[2] = c.blk[5]
- dst[3] = c.blk[4]
- dst[4] = c.blk[3]
- dst[5] = c.blk[2]
- dst[6] = c.blk[1]
- dst[7] = c.blk[0]
-}
-
-func (c *Cipher) Decrypt(dst, src []byte) {
- c.blk[0] = src[7]
- c.blk[1] = src[6]
- c.blk[2] = src[5]
- c.blk[3] = src[4]
- c.blk[4] = src[3]
- c.blk[5] = src[2]
- c.blk[6] = src[1]
- c.blk[7] = src[0]
- c.c.Decrypt(c.blk[:], c.blk[:])
- dst[0] = c.blk[7]
- dst[1] = c.blk[6]
- dst[2] = c.blk[5]
- dst[3] = c.blk[4]
- dst[4] = c.blk[3]
- dst[5] = c.blk[2]
- dst[6] = c.blk[1]
- dst[7] = c.blk[0]
-}