forked from acouzens/open5gs
119 lines
3.7 KiB
C
119 lines
3.7 KiB
C
/*
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* Copyright (C) 2019,2020 by Sukchan Lee <acetcom@gmail.com>
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*
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* This file is part of Open5GS.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "ogs-nas-common.h"
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void ogs_nas_mac_calculate(uint8_t algorithm_identity,
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uint8_t *knas_int, uint32_t count, uint8_t bearer,
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uint8_t direction, ogs_pkbuf_t *pkbuf, uint8_t *mac)
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{
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uint8_t *ivec = NULL;;
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uint8_t cmac[16];
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uint32_t mac32;
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ogs_assert(knas_int);
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ogs_assert(bearer <= 0x1f);
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ogs_assert(direction == 0 || direction == 1);
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ogs_assert(pkbuf);
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ogs_assert(pkbuf->data);
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ogs_assert(pkbuf->len);
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ogs_assert(mac);
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switch (algorithm_identity) {
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case OGS_NAS_SECURITY_ALGORITHMS_128_EIA1:
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snow_3g_f9(knas_int, count, (bearer << 27), direction,
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pkbuf->data, (pkbuf->len << 3), mac);
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break;
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case OGS_NAS_SECURITY_ALGORITHMS_128_EIA2:
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count = htonl(count);
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ogs_pkbuf_push(pkbuf, 8);
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ivec = pkbuf->data;
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memset(ivec, 0, 8);
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memcpy(ivec + 0, &count, sizeof(count));
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ivec[4] = (bearer << 3) | (direction << 2);
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ogs_aes_cmac_calculate(cmac, knas_int, pkbuf->data, pkbuf->len);
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memcpy(mac, cmac, 4);
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ogs_pkbuf_pull(pkbuf, 8);
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break;
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case OGS_NAS_SECURITY_ALGORITHMS_128_EIA3:
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zuc_eia3(knas_int, count, bearer, direction,
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(pkbuf->len << 3), pkbuf->data, &mac32);
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mac32 = ntohl(mac32);
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memcpy(mac, &mac32, sizeof(uint32_t));
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break;
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case OGS_NAS_SECURITY_ALGORITHMS_EIA0:
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ogs_error("Invalid identity : NAS_SECURITY_ALGORITHMS_EIA0");
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break;
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default:
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ogs_assert_if_reached();
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break;
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}
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}
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void ogs_nas_encrypt(uint8_t algorithm_identity,
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uint8_t *knas_enc, uint32_t count, uint8_t bearer,
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uint8_t direction, ogs_pkbuf_t *pkbuf)
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{
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uint8_t ivec[16];
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SNOW_CTX ctx;
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ogs_assert(knas_enc);
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ogs_assert(bearer <= 0x1f);
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ogs_assert(direction == 0 || direction == 1);
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ogs_assert(pkbuf);
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ogs_assert(pkbuf->data);
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ogs_assert(pkbuf->len);
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switch (algorithm_identity) {
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case OGS_NAS_SECURITY_ALGORITHMS_128_EEA1:
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#if 0 /* Issue #2581 : snow_3g_f8 have memory problem */
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snow_3g_f8(knas_enc, count, bearer, direction,
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pkbuf->data, (pkbuf->len << 3));
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#else
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SNOW_init(count, bearer, direction, (const char *)knas_enc, &ctx);
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SNOW(pkbuf->len, pkbuf->data, pkbuf->data, &ctx);
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#endif
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break;
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case OGS_NAS_SECURITY_ALGORITHMS_128_EEA2:
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count = htonl(count);
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memset(ivec, 0, 16);
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memcpy(ivec + 0, &count, sizeof(count));
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ivec[4] = (bearer << 3) | (direction << 2);
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ogs_aes_ctr128_encrypt(knas_enc, ivec,
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pkbuf->data, pkbuf->len, pkbuf->data);
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break;
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case OGS_NAS_SECURITY_ALGORITHMS_128_EEA3:
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zuc_eea3(knas_enc, count, bearer, direction,
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(pkbuf->len << 3), pkbuf->data, pkbuf->data);
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break;
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case OGS_NAS_SECURITY_ALGORITHMS_EEA0:
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ogs_error("Invalid identity : NAS_SECURITY_ALGORITHMS_EEA0");
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break;
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default:
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ogs_assert_if_reached();
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break;
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}
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}
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