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/* GSM/GPRS/3G authentication core infrastructure */
/* (C) 2011 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <osmocom/crypt/auth.h>
#include "milenage/common.h"
#include "milenage/milenage.h"
static void sqn_u64_to_48bit(uint8_t *sqn, const uint64_t sqn64)
{
sqn[5] = (sqn64 >> 0) & 0xff;
sqn[4] = (sqn64 >> 8) & 0xff;
sqn[3] = (sqn64 >> 16) & 0xff;
sqn[2] = (sqn64 >> 24) & 0xff;
sqn[1] = (sqn64 >> 32) & 0xff;
sqn[0] = (sqn64 >> 40) & 0xff;
}
static uint64_t sqn_48bit_to_u64(const uint8_t *sqn)
{
uint64_t sqn64;
sqn64 = sqn[0];
sqn64 <<= 8;
sqn64 |= sqn[1];
sqn64 <<= 8;
sqn64 |= sqn[2];
sqn64 <<= 8;
sqn64 |= sqn[3];
sqn64 <<= 8;
sqn64 |= sqn[4];
sqn64 <<= 8;
sqn64 |= sqn[5];
return sqn64;
}
static int milenage_gen_vec(struct osmo_auth_vector *vec,
struct osmo_sub_auth_data *aud,
const uint8_t *_rand)
{
size_t res_len = sizeof(vec->res);
uint8_t sqn[6];
int rc;
sqn_u64_to_48bit(sqn, aud->u.umts.sqn);
milenage_generate(aud->u.umts.opc, aud->u.umts.amf, aud->u.umts.k,
sqn, _rand,
vec->autn, vec->ik, vec->ck, vec->res, &res_len);
vec->res_len = res_len;
rc = gsm_milenage(aud->u.umts.opc, aud->u.umts.k, _rand, vec->sres, vec->kc);
if (rc < 0)
return rc;
vec->auth_types = OSMO_AUTH_TYPE_UMTS | OSMO_AUTH_TYPE_GSM;
aud->u.umts.sqn++;
return 0;
}
static int milenage_gen_vec_auts(struct osmo_auth_vector *vec,
struct osmo_sub_auth_data *aud,
const uint8_t *auts, const uint8_t *rand_auts,
const uint8_t *_rand)
{
uint8_t sqn_out[6];
uint8_t gen_opc[16];
uint8_t *opc;
int rc;
/* Check if we only know OP and compute OPC if required */
if (aud->type == OSMO_AUTH_TYPE_UMTS && aud->u.umts.opc_is_op) {
rc = milenage_opc_gen(gen_opc, aud->u.umts.k,
aud->u.umts.opc);
if (rc < 0)
return rc;
opc = gen_opc;
} else
opc = aud->u.umts.opc;
rc = milenage_auts(opc, aud->u.umts.k, rand_auts, auts, sqn_out);
if (rc < 0)
return rc;
aud->u.umts.sqn = sqn_48bit_to_u64(sqn_out) + 1;
return milenage_gen_vec(vec, aud, _rand);
}
static struct osmo_auth_impl milenage_alg = {
.algo = OSMO_AUTH_ALG_MILENAGE,
.name = "MILENAGE (libosmogsm built-in)",
.priority = 1000,
.gen_vec = &milenage_gen_vec,
.gen_vec_auts = &milenage_gen_vec_auts,
};
static __attribute__((constructor)) void on_dso_load_milenage(void)
{
osmo_auth_register(&milenage_alg);
}
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