#include <errno.h>
#include <string.h>
#include <stdbool.h>
#include <osmocom/gsm/a5.h>
#include <osmocom/gsm/kasumi.h>
#include <osmocom/crypt/auth.h>

Macros
#define	ENOTSUP EINVAL

#define	A5_R1_LEN 19

#define	A5_R2_LEN 22

#define	A5_R3_LEN 23

#define	A5_R4_LEN 17 /* A5/2 only */

#define	A5_R1_MASK ((1<<A5_R1_LEN)-1)

#define	A5_R2_MASK ((1<<A5_R2_LEN)-1)

#define	A5_R3_MASK ((1<<A5_R3_LEN)-1)

#define	A5_R4_MASK ((1<<A5_R4_LEN)-1)

#define	A5_R1_TAPS 0x072000 /* x^19 + x^18 + x^17 + x^14 + 1 */

#define	A5_R2_TAPS 0x300000 /* x^22 + x^21 + 1 */

#define	A5_R3_TAPS 0x700080 /* x^23 + x^22 + x^21 + x^8 + 1 */

#define	A5_R4_TAPS 0x010800 /* x^17 + x^12 + 1 */

#define	A51_R1_CLKBIT 0x000100

#define	A51_R2_CLKBIT 0x000400

#define	A51_R3_CLKBIT 0x000400

#define	A52_R4_CLKBIT0 0x000400

#define	A52_R4_CLKBIT1 0x000008

#define	A52_R4_CLKBIT2 0x000080

Functions
void	_a5_4 (const uint8_t ck, uint32_t fn, ubit_t dl, ubit_t *ul, bool fn_correct)
	Generate a GSM A5/4 cipher stream. More...

void	_a5_3 (const uint8_t key, uint32_t fn, ubit_t dl, ubit_t *ul, bool fn_correct)
	Generate a GSM A5/3 cipher stream. More...

static uint32_t	_a5_12_parity (uint32_t x)
	Computes parity of a 32-bit word. More...

static uint32_t	_a5_12_majority (uint32_t v1, uint32_t v2, uint32_t v3)
	Compute majority bit from 3 taps. More...

static uint32_t	_a5_12_clock (uint32_t r, uint32_t mask, uint32_t taps)
	Compute the next LFSR state. More...

static void	_a5_1_clock (uint32_t r[], int force)
	GSM A5/1 Clocking function. More...

static uint8_t	_a5_1_get_output (uint32_t r[])
	GSM A5/1 Output function. More...

void	_a5_1 (const uint8_t key, uint32_t fn, ubit_t dl, ubit_t *ul)
	Generate a GSM A5/1 cipher stream. More...

void	osmo_a5_1 (const uint8_t key, uint32_t fn, ubit_t dl, ubit_t *ul) OSMO_DEPRECATED("Use generic osmo_a5() instead")

static void	_a5_2_clock (uint32_t r[], int force)
	GSM A5/2 Clocking function. More...

static uint8_t	_a5_2_get_output (uint32_t r[])
	GSM A5/2 Output function. More...

void	_a5_2 (const uint8_t key, uint32_t fn, ubit_t dl, ubit_t *ul)
	Generate a GSM A5/1 cipher stream. More...

void	osmo_a5_2 (const uint8_t key, uint32_t fn, ubit_t dl, ubit_t *ul) OSMO_DEPRECATED("Use generic osmo_a5() instead")

int	osmo_a5 (int n, const uint8_t key, uint32_t fn, ubit_t dl, ubit_t *ul)
	Main method to generate a A5/x cipher stream. More...

Macros

Functions