a5.c File Reference

Osmocom GMR-1 A5 ciphering algorithm implementation. More...

#include <string.h>
#include <stdint.h>
#include <osmocom/core/bits.h>
#include <osmocom/gmr1/l1/a5.h>

Macros
#define	A51_R1_LEN   19
#define	A51_R2_LEN   22
#define	A51_R3_LEN   23
#define	A51_R4_LEN   17
#define	A51_R1_MASK   ((1<<A51_R1_LEN)-1)
#define	A51_R2_MASK   ((1<<A51_R2_LEN)-1)
#define	A51_R3_MASK   ((1<<A51_R3_LEN)-1)
#define	A51_R4_MASK   ((1<<A51_R4_LEN)-1)
#define	A51_R1_TAPS   0x072000 /* x^19 + x^18 + x^17 + x^14 + 1 */
#define	A51_R2_TAPS   0x311000 /* x^22 + x^21 + x^17 + x^13 + 1 */
#define	A51_R3_TAPS   0x660000 /* x^23 + x^22 + x^19 + x^18 + 1 */
#define	A51_R4_TAPS   0x013100 /* x^17 + x^14 + x^13 + x^9 + 1 */
#define	A51_BIT(r, n)   (1 << n)
#define	MAJ(rnum, rname, a, b, c)

Functions
void	gmr1_a5 (int n, uint8_t *key, uint32_t fn, int nbits, ubit_t *dl, ubit_t *ul)
	Main method to generate a A5/x cipher stream. More...
void	gmr1_a5_1 (uint8_t *key, uint32_t fn, int nbits, ubit_t *dl, ubit_t *ul)
	Generate a GMR-1 A5/1 cipher stream. More...

Detailed Description

Osmocom GMR-1 A5 ciphering algorithm implementation.

Macro Definition Documentation

MAJ

#define MAJ	(		rnum,
			rname,
			a,
			b,
			c
	)

Value:

                m[rnum] = _a5_majority(                 \
                        r[rnum] & A51_BIT(rname, a),    \
                        r[rnum] & A51_BIT(rname, b),    \
                        r[rnum] & A51_BIT(rname, c)     \
                );