90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
|
/*
|
||
|
|
* zrtp_crypto_ec.c - Elliptic Curve Low Level Crypto functions for ZRTP.
|
||
|
|
* NSA Suite B Elliptic Curves from NIST SP 800-56A and FIPS 186-3.
|
||
|
|
*
|
||
|
|
* Copyright (c) 2006-2009 Philip R. Zimmermann. All rights reserved.
|
||
|
|
* This is NOT licensed under the GPL or any other open source license.
|
||
|
|
* For licensing terms or other information,
|
||
|
|
* contact: Philip Zimmermann <prz@mit.edu>.
|
||
|
|
* For more contact information, see http://philzimmermann.com
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef __ZRTP_CRYPTO_EC_H__
|
||
|
|
#define __ZRTP_CRYPTO_EC_H__
|
||
|
|
|
||
|
|
#include "bn.h"
|
||
|
|
|
||
|
|
#include "zrtp_config.h"
|
||
|
|
#include "zrtp_types.h"
|
||
|
|
#include "zrtp_error.h"
|
||
|
|
|
||
|
|
#if (defined(ZRTP_ENABLE_EC) && (ZRTP_ENABLE_EC == 1))
|
||
|
|
|
||
|
|
#define ZRTP_MAXECBITS 521
|
||
|
|
#define ZRTP_MAXECWORDS ((ZRTP_MAXECBITS+7)/8)
|
||
|
|
|
||
|
|
typedef struct zrtp_ec_params
|
||
|
|
{
|
||
|
|
unsigned ec_bits; /* # EC bits: 256, 384, 521 */
|
||
|
|
uint8_t P_data[ZRTP_MAXECWORDS]; /* curve field prime */
|
||
|
|
uint8_t n_data[ZRTP_MAXECWORDS]; /* curve order (# points) */
|
||
|
|
uint8_t b_data[ZRTP_MAXECWORDS]; /* curve param, y^3 = x^2 -3x + b */
|
||
|
|
uint8_t Gx_data[ZRTP_MAXECWORDS]; /* curve point, x coordinate */
|
||
|
|
uint8_t Gy_data[ZRTP_MAXECWORDS]; /* curve point, y coordinate */
|
||
|
|
} zrtp_ec_params_t;
|
||
|
|
|
||
|
|
#if defined(__cplusplus)
|
||
|
|
extern "C"
|
||
|
|
{
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/*============================================================================*/
|
||
|
|
/* Elliptic Curve library */
|
||
|
|
/*============================================================================*/
|
||
|
|
|
||
|
|
int zrtp_ecAdd ( struct BigNum *rsltx,
|
||
|
|
struct BigNum *rslty,
|
||
|
|
struct BigNum *p1x,
|
||
|
|
struct BigNum *p1y,
|
||
|
|
struct BigNum *p2x,
|
||
|
|
struct BigNum *p2y,
|
||
|
|
struct BigNum *mod);
|
||
|
|
|
||
|
|
int zrtp_ecMul ( struct BigNum *rsltx,
|
||
|
|
struct BigNum *rslty,
|
||
|
|
struct BigNum *mult,
|
||
|
|
struct BigNum *basex,
|
||
|
|
struct BigNum *basey,
|
||
|
|
struct BigNum *mod);
|
||
|
|
|
||
|
|
zrtp_status_t zrtp_ec_random_point( zrtp_global_t *zrtp,
|
||
|
|
struct BigNum *P,
|
||
|
|
struct BigNum *n,
|
||
|
|
struct BigNum *Gx,
|
||
|
|
struct BigNum *Gy,
|
||
|
|
struct BigNum *pkx,
|
||
|
|
struct BigNum *pky,
|
||
|
|
struct BigNum *sv,
|
||
|
|
uint8_t *test_sv_data,
|
||
|
|
size_t test_sv_data_len);
|
||
|
|
|
||
|
|
extern zrtp_status_t zrtp_ec_init_params(struct zrtp_ec_params *params, uint32_t bits );
|
||
|
|
|
||
|
|
|
||
|
|
/* Useful bignum utility functions not defined in bignum library */
|
||
|
|
int bnAddMod_ (struct BigNum *rslt, struct BigNum *n1, struct BigNum *mod);
|
||
|
|
int bnAddQMod_ (struct BigNum *rslt, unsigned n1, struct BigNum *mod);
|
||
|
|
int bnSubMod_ (struct BigNum *rslt, struct BigNum *n1, struct BigNum *mod);
|
||
|
|
int bnSubQMod_ (struct BigNum *rslt, unsigned n1, struct BigNum *mod);
|
||
|
|
int bnMulMod_ (struct BigNum *rslt, struct BigNum *n1, struct BigNum *n2, struct BigNum *mod);
|
||
|
|
int bnMulQMod_ (struct BigNum *rslt, struct BigNum *n1, unsigned n2, struct BigNum *mod);
|
||
|
|
int bnSquareMod_ (struct BigNum *rslt, struct BigNum *n1, struct BigNum *mod);
|
||
|
|
|
||
|
|
#if defined(__cplusplus)
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /*ZRTP_ENABLE_EC*/
|
||
|
|
|
||
|
|
#endif /* __ZRTP_CRYPTO_EC_H__ */
|