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/*
* Copyright (C) 2011-2012 Free Software Foundation, Inc.
* Copyright (C) 2016 Dmitry Eremin-Solenikov
*
* This file is part of GnuTLS.
*
* The GnuTLS is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>
*/
#include "gnutls_int.h"
#include "gost/gost28147.h"
static const struct gost28147_param
*_gnutls_gost_get_param(gnutls_gost_paramset_t param)
{
if (param == GNUTLS_GOST_PARAMSET_TC26_Z)
return &gost28147_param_TC26_Z;
else if (param == GNUTLS_GOST_PARAMSET_CP_A)
return &gost28147_param_CryptoPro_A;
else if (param == GNUTLS_GOST_PARAMSET_CP_B)
return &gost28147_param_CryptoPro_B;
else if (param == GNUTLS_GOST_PARAMSET_CP_C)
return &gost28147_param_CryptoPro_C;
else if (param == GNUTLS_GOST_PARAMSET_CP_D)
return &gost28147_param_CryptoPro_D;
gnutls_assert();
return NULL;
}
int _gnutls_gost_key_wrap(gnutls_gost_paramset_t gost_params,
const gnutls_datum_t * kek,
const gnutls_datum_t * ukm,
const gnutls_datum_t * cek,
gnutls_datum_t * enc, gnutls_datum_t * imit)
{
const struct gost28147_param *gp;
gp = _gnutls_gost_get_param(gost_params);
if (gp == NULL) {
return gnutls_assert_val(GNUTLS_E_ILLEGAL_PARAMETER);
}
if (kek->size != GOST28147_KEY_SIZE ||
cek->size != GOST28147_KEY_SIZE ||
ukm->size < GOST28147_IMIT_BLOCK_SIZE) {
return gnutls_assert_val(GNUTLS_E_ILLEGAL_PARAMETER);
}
enc->size = GOST28147_KEY_SIZE;
enc->data = gnutls_malloc(enc->size);
if (enc->data == NULL) {
return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
}
imit->size = GOST28147_IMIT_DIGEST_SIZE;
imit->data = gnutls_malloc(imit->size);
if (imit->data == NULL) {
_gnutls_free_datum(enc);
return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
}
gost28147_key_wrap_cryptopro(gp, kek->data, ukm->data, ukm->size,
cek->data, enc->data, imit->data);
return 0;
}
int _gnutls_gost_key_unwrap(gnutls_gost_paramset_t gost_params,
const gnutls_datum_t * kek,
const gnutls_datum_t * ukm,
const gnutls_datum_t * enc,
const gnutls_datum_t * imit, gnutls_datum_t * cek)
{
const struct gost28147_param *gp;
int ret;
gp = _gnutls_gost_get_param(gost_params);
if (gp == NULL) {
return gnutls_assert_val(GNUTLS_E_ILLEGAL_PARAMETER);
}
if (kek->size != GOST28147_KEY_SIZE ||
enc->size != GOST28147_KEY_SIZE ||
imit->size != GOST28147_IMIT_DIGEST_SIZE ||
ukm->size < GOST28147_IMIT_BLOCK_SIZE) {
return gnutls_assert_val(GNUTLS_E_ILLEGAL_PARAMETER);
}
cek->size = GOST28147_KEY_SIZE;
cek->data = gnutls_malloc(cek->size);
if (cek->data == NULL) {
return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
}
ret = gost28147_key_unwrap_cryptopro(gp, kek->data,
ukm->data, ukm->size,
enc->data, imit->data, cek->data);
if (ret == 0) {
gnutls_assert();
_gnutls_free_temp_key_datum(cek);
return GNUTLS_E_DECRYPTION_FAILED;
}
return 0;
}
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