Lionel Gauthier
1933ffbdc7
git-svn-id: http://svn.eurecom.fr/openair4G/trunk@5619 818b1a75-f10b-46b9-bf7c-635c3b92a50f
83 lines
2.6 KiB
C
83 lines
2.6 KiB
C
/*******************************************************************************
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OpenAirInterface
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Copyright(c) 1999 - 2014 Eurecom
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OpenAirInterface is free software: you can redistribute it and/or modify
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it under the terms of the GNU 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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OpenAirInterface 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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You should have received a copy of the GNU General Public License
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along with OpenAirInterface.The full GNU General Public License is
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included in this distribution in the file called "COPYING". If not,
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see <http://www.gnu.org/licenses/>.
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Contact Information
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OpenAirInterface Admin: openair_admin@eurecom.fr
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OpenAirInterface Tech : openair_tech@eurecom.fr
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OpenAirInterface Dev : openair4g-devel@eurecom.fr
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Address : Eurecom, Compus SophiaTech 450, route des chappes, 06451 Biot, France.
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*******************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include "auc.h"
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uint8_t *sqn_ms_derive(uint8_t *key, uint8_t *auts, uint8_t *rand_p)
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{
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/* AUTS = Conc(SQN MS ) || MAC-S
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* Conc(SQN MS ) = SQN MS ^ f5* (RAND)
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* MAC-S = f1* (SQN MS || RAND || AMF)
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*/
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uint8_t ak[6];
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uint8_t *conc_sqn_ms;
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uint8_t *mac_s;
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uint8_t mac_s_computed[MAC_S_LENGTH];
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uint8_t *sqn_ms;
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uint8_t amf[2] = { 0, 0 };
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int i;
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conc_sqn_ms = auts;
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mac_s = &auts[6];
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sqn_ms = malloc(SQN_LENGTH_OCTEST);
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SetOPc(opc);
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/* Derive AK from key and rand */
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f5star(key, rand_p, ak);
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for (i = 0; i < 6; i++) {
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sqn_ms[i] = ak[i] ^ conc_sqn_ms[i];
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}
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print_buffer("sqn_ms_derive() KEY : ", key, 16);
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print_buffer("sqn_ms_derive() RAND : ", rand_p, 16);
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print_buffer("sqn_ms_derive() AUTS : ", auts, 14);
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print_buffer("sqn_ms_derive() AK : ", ak, 6);
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print_buffer("sqn_ms_derive() SQN_MS : ", sqn_ms, 6);
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print_buffer("sqn_ms_derive() MAC_S : ", mac_s, 8);
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f1star(key, rand_p, sqn_ms, amf, mac_s_computed);
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print_buffer("MAC_S +: ", mac_s_computed, 8);
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if (memcmp(mac_s_computed, mac_s, 8) != 0) {
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fprintf(stderr, "Failed to verify computed SQN_MS\n");
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free(sqn_ms);
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return NULL;
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}
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return sqn_ms;
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}
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