4 * Copyright (C) 2011 Sylvain Munaut <tnt@246tNt.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
28 #include <osmocom/core/bits.h>
30 static inline uint32_t
31 osmo_a5_fn_count(uint32_t fn)
33 int t1 = fn / (26 * 51);
36 return (t1 << 11) | (t3 << 5) | t2;
40 * - key must be 8 bytes long (or NULL for A5/0)
41 * - the dl and ul pointer must be either NULL or 114 bits long
42 * - fn is the _real_ GSM frame number.
43 * (converted internally to fn_count)
45 void osmo_a5(int n, uint8_t *key, uint32_t fn, ubit_t *dl, ubit_t *ul);
46 void osmo_a5_1(uint8_t *key, uint32_t fn, ubit_t *dl, ubit_t *ul);
47 void osmo_a5_2(uint8_t *key, uint32_t fn, ubit_t *dl, ubit_t *ul);
49 #endif /* __OSMO_A5_H__ */