Lionel Gauthier
5345032add
git-svn-id: http://svn.eurecom.fr/openair4G/trunk@5579 818b1a75-f10b-46b9-bf7c-635c3b92a50f
73 lines
2.1 KiB
C
73 lines
2.1 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 <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <nettle/hmac.h>
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#include "security_types.h"
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#include "secu_defs.h"
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void kdf(uint8_t *key, uint16_t key_len, uint8_t *s, uint16_t s_len, uint8_t *out,
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uint16_t out_len)
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{
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struct hmac_sha256_ctx ctx;
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memset(&ctx, 0, sizeof(ctx));
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hmac_sha256_set_key(&ctx, key_len, key);
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hmac_sha256_update(&ctx, s_len, s);
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hmac_sha256_digest(&ctx, out_len, out);
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}
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#ifndef NAS_UE
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int derive_keNB(const uint8_t kasme[32], const uint32_t nas_count, uint8_t *keNB)
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{
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uint8_t s[7];
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// FC
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s[0] = FC_KENB;
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// P0 = Uplink NAS count
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s[1] = (nas_count & 0xff000000) >> 24;
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s[2] = (nas_count & 0x00ff0000) >> 16;
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s[3] = (nas_count & 0x0000ff00) >> 8;
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s[4] = (nas_count & 0x000000ff);
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// Length of NAS count
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s[5] = 0x00;
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s[6] = 0x04;
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kdf(kasme, 32, s, 7, keNB, 32);
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return 0;
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}
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#endif
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