118 lines
3.7 KiB
C
118 lines
3.7 KiB
C
/*
|
|
* Copyright (C) 2019,2020 by Sukchan Lee <acetcom@gmail.com>
|
|
*
|
|
* This file is part of Open5GS.
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Affero 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 <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "ogs-nas-common.h"
|
|
|
|
void ogs_nas_mac_calculate(uint8_t algorithm_identity,
|
|
uint8_t *knas_int, uint32_t count, uint8_t bearer,
|
|
uint8_t direction, ogs_pkbuf_t *pkbuf, uint8_t *mac)
|
|
{
|
|
uint8_t *ivec = NULL;;
|
|
uint8_t cmac[16];
|
|
uint32_t mac32;
|
|
|
|
ogs_assert(knas_int);
|
|
ogs_assert(bearer <= 0x1f);
|
|
ogs_assert(direction == 0 || direction == 1);
|
|
ogs_assert(pkbuf);
|
|
ogs_assert(pkbuf->data);
|
|
ogs_assert(pkbuf->len);
|
|
ogs_assert(mac);
|
|
|
|
switch (algorithm_identity) {
|
|
case OGS_NAS_SECURITY_ALGORITHMS_128_EIA1:
|
|
snow_3g_f9(knas_int, count, (bearer << 27), direction,
|
|
pkbuf->data, (pkbuf->len << 3), mac);
|
|
break;
|
|
case OGS_NAS_SECURITY_ALGORITHMS_128_EIA2:
|
|
count = htonl(count);
|
|
|
|
ogs_pkbuf_push(pkbuf, 8);
|
|
|
|
ivec = pkbuf->data;
|
|
memset(ivec, 0, 8);
|
|
memcpy(ivec + 0, &count, sizeof(count));
|
|
ivec[4] = (bearer << 3) | (direction << 2);
|
|
|
|
ogs_aes_cmac_calculate(cmac, knas_int, pkbuf->data, pkbuf->len);
|
|
memcpy(mac, cmac, 4);
|
|
|
|
ogs_pkbuf_pull(pkbuf, 8);
|
|
|
|
break;
|
|
case OGS_NAS_SECURITY_ALGORITHMS_128_EIA3:
|
|
zuc_eia3(knas_int, count, bearer, direction,
|
|
(pkbuf->len << 3), pkbuf->data, &mac32);
|
|
mac32 = ntohl(mac32);
|
|
memcpy(mac, &mac32, sizeof(uint32_t));
|
|
break;
|
|
case OGS_NAS_SECURITY_ALGORITHMS_EIA0:
|
|
ogs_error("Invalid identity : NAS_SECURITY_ALGORITHMS_EIA0");
|
|
break;
|
|
default:
|
|
ogs_assert_if_reached();
|
|
break;
|
|
}
|
|
}
|
|
|
|
void ogs_nas_encrypt(uint8_t algorithm_identity,
|
|
uint8_t *knas_enc, uint32_t count, uint8_t bearer,
|
|
uint8_t direction, ogs_pkbuf_t *pkbuf)
|
|
{
|
|
uint8_t ivec[16];
|
|
SNOW_CTX ctx;
|
|
|
|
ogs_assert(knas_enc);
|
|
ogs_assert(bearer <= 0x1f);
|
|
ogs_assert(direction == 0 || direction == 1);
|
|
ogs_assert(pkbuf);
|
|
ogs_assert(pkbuf->data);
|
|
ogs_assert(pkbuf->len);
|
|
|
|
switch (algorithm_identity) {
|
|
case OGS_NAS_SECURITY_ALGORITHMS_128_EEA1:
|
|
#if 0 /* Issue #2581 : snow_3g_f8 have memory problem */
|
|
snow_3g_f8(knas_enc, count, bearer, direction,
|
|
pkbuf->data, (pkbuf->len << 3));
|
|
#else
|
|
SNOW_init(count, bearer, direction, (const char *)knas_enc, &ctx);
|
|
SNOW(pkbuf->len, pkbuf->data, pkbuf->data, &ctx);
|
|
#endif
|
|
break;
|
|
case OGS_NAS_SECURITY_ALGORITHMS_128_EEA2:
|
|
count = htonl(count);
|
|
|
|
memset(ivec, 0, 16);
|
|
memcpy(ivec + 0, &count, sizeof(count));
|
|
ivec[4] = (bearer << 3) | (direction << 2);
|
|
ogs_aes_ctr128_encrypt(knas_enc, ivec,
|
|
pkbuf->data, pkbuf->len, pkbuf->data);
|
|
break;
|
|
case OGS_NAS_SECURITY_ALGORITHMS_128_EEA3:
|
|
zuc_eea3(knas_enc, count, bearer, direction,
|
|
(pkbuf->len << 3), pkbuf->data, pkbuf->data);
|
|
break;
|
|
case OGS_NAS_SECURITY_ALGORITHMS_EEA0:
|
|
ogs_error("Invalid identity : NAS_SECURITY_ALGORITHMS_EEA0");
|
|
break;
|
|
default:
|
|
ogs_assert_if_reached();
|
|
break;
|
|
}
|
|
}
|