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/* GOST 28147-89 (Magma) implementation
*
* Copyright: 2015, 2016 Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
* Copyright: 2009-2012 Aleksey Kravchenko <rhash.admin@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
#include <gnutls_int.h>
#include <string.h>
#include <nettle/macros.h>
#include "gost28147.h"
#include <nettle/cfb.h>
#include <nettle/memops.h>
void
gost28147_kdf_cryptopro(const struct gost28147_param *param,
const uint8_t *in,
const uint8_t *ukm,
uint8_t *out)
{
struct gost28147_ctx ctx;
int i;
memcpy(out, in, GOST28147_KEY_SIZE);
for (i = 0; i < 8; i++) {
uint8_t mask;
uint8_t *p;
uint8_t iv[GOST28147_BLOCK_SIZE];
uint32_t block[2] = {0, 0};
uint32_t t;
for (p = out, mask = 1; mask; mask <<= 1) {
t = LE_READ_UINT32(p);
p += 4;
if (mask & ukm[i])
block[0] += t;
else
block[1] += t;
}
LE_WRITE_UINT32(iv + 0, block[0]);
LE_WRITE_UINT32(iv + 4, block[1]);
gost28147_set_key(&ctx, out);
gost28147_set_param(&ctx, param);
cfb_encrypt(&ctx,
(nettle_cipher_func*)gost28147_encrypt_for_cfb,
GOST28147_BLOCK_SIZE, iv,
GOST28147_KEY_SIZE, out, out);
}
}
void
gost28147_key_wrap_cryptopro(const struct gost28147_param *param,
const uint8_t *kek,
const uint8_t *ukm, size_t ukm_size,
const uint8_t *cek,
uint8_t *enc,
uint8_t *imit)
{
uint8_t kd[GOST28147_KEY_SIZE];
struct gost28147_ctx ctx;
struct gost28147_imit_ctx ictx;
assert(ukm_size >= GOST28147_IMIT_BLOCK_SIZE);
gost28147_kdf_cryptopro(param, kek, ukm, kd);
gost28147_set_key(&ctx, kd);
gost28147_set_param(&ctx, param);
gost28147_encrypt(&ctx, GOST28147_KEY_SIZE, enc, cek);
gost28147_imit_set_key(&ictx, GOST28147_KEY_SIZE, kd);
gost28147_imit_set_param(&ictx, param);
gost28147_imit_set_nonce(&ictx, ukm);
gost28147_imit_update(&ictx, GOST28147_KEY_SIZE, cek);
gost28147_imit_digest(&ictx, GOST28147_IMIT_DIGEST_SIZE, imit);
}
int
gost28147_key_unwrap_cryptopro(const struct gost28147_param *param,
const uint8_t *kek,
const uint8_t *ukm, size_t ukm_size,
const uint8_t *enc,
const uint8_t *imit,
uint8_t *cek)
{
uint8_t kd[GOST28147_KEY_SIZE];
uint8_t mac[GOST28147_IMIT_DIGEST_SIZE];
struct gost28147_ctx ctx;
struct gost28147_imit_ctx ictx;
assert(ukm_size >= GOST28147_IMIT_BLOCK_SIZE);
gost28147_kdf_cryptopro(param, kek, ukm, kd);
gost28147_set_key(&ctx, kd);
gost28147_set_param(&ctx, param);
gost28147_decrypt(&ctx, GOST28147_KEY_SIZE, cek, enc);
gost28147_imit_set_key(&ictx, GOST28147_KEY_SIZE, kd);
gost28147_imit_set_param(&ictx, param);
gost28147_imit_set_nonce(&ictx, ukm);
gost28147_imit_update(&ictx, GOST28147_KEY_SIZE, cek);
gost28147_imit_digest(&ictx, GOST28147_IMIT_DIGEST_SIZE, mac);
return memeql_sec(mac, imit, GOST28147_IMIT_DIGEST_SIZE);
}
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