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/* magma.c - GOST R 34.12-2015 (Magma) cipher implementation
*
* Copyright: 2017 Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#ifndef HAVE_NETTLE_MAGMA_SET_KEY
#include <assert.h>
#include <nettle/macros.h>
#include "nettle-write.h"
#include "magma.h"
#ifndef HAVE_NETTLE_GOST28147_SET_KEY
#include "gost28147.h"
#else
#include <nettle/gost28147.h>
#endif
void
magma_set_key(struct magma_ctx *ctx, const uint8_t *key)
{
unsigned i;
for (i = 0; i < 8; i++, key += 4)
ctx->key[i] = READ_UINT32(key);
}
void
magma_encrypt(const struct magma_ctx *ctx,
size_t length, uint8_t *dst,
const uint8_t *src)
{
uint32_t block[2];
assert(!(length % MAGMA_BLOCK_SIZE));
while (length)
{
block[1] = READ_UINT32(src); src += 4;
block[0] = READ_UINT32(src); src += 4;
gost28147_encrypt_simple(ctx->key, gost28147_param_TC26_Z.sbox,
block, block);
WRITE_UINT32(dst, block[1]); dst += 4;
WRITE_UINT32(dst, block[0]); dst += 4;
length -= MAGMA_BLOCK_SIZE;
}
}
void
magma_decrypt(const struct magma_ctx *ctx,
size_t length, uint8_t *dst,
const uint8_t *src)
{
uint32_t block[2];
assert(!(length % MAGMA_BLOCK_SIZE));
while (length)
{
block[1] = READ_UINT32(src); src += 4;
block[0] = READ_UINT32(src); src += 4;
gost28147_decrypt_simple(ctx->key, gost28147_param_TC26_Z.sbox,
block, block);
WRITE_UINT32(dst, block[1]); dst += 4;
WRITE_UINT32(dst, block[0]); dst += 4;
length -= MAGMA_BLOCK_SIZE;
}
}
#endif /* HAVE_NETTLE_MAGMA_SET_KEY */
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