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/*
* Embedded Linux library
* Copyright (C) 2018 Intel Corporation
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#ifndef __ELL_ECC_H
#define __ELL_ECC_H
#include <sys/types.h>
#include <ell/cleanup.h>
#ifdef __cplusplus
extern "C" {
#endif
#define L_ECC_MAX_DIGITS 9
#define L_ECC_SCALAR_MAX_BYTES L_ECC_MAX_DIGITS * 8
#define L_ECC_POINT_MAX_BYTES L_ECC_SCALAR_MAX_BYTES * 2
struct l_ecc_curve;
struct l_ecc_point;
struct l_ecc_scalar;
enum l_ecc_point_type {
L_ECC_POINT_TYPE_COMPLIANT = 0x01,
L_ECC_POINT_TYPE_COMPRESSED_BIT0 = 0x02,
L_ECC_POINT_TYPE_COMPRESSED_BIT1 = 0x03,
L_ECC_POINT_TYPE_FULL = 0x04,
};
const unsigned int *l_ecc_supported_ike_groups(void);
const unsigned int *l_ecc_supported_tls_groups(void);
const struct l_ecc_curve *l_ecc_curve_from_name(const char *name);
const struct l_ecc_curve *l_ecc_curve_from_ike_group(unsigned int group);
const struct l_ecc_curve *l_ecc_curve_from_tls_group(unsigned int group);
const char *l_ecc_curve_get_name(const struct l_ecc_curve *curve);
unsigned int l_ecc_curve_get_ike_group(const struct l_ecc_curve *curve);
unsigned int l_ecc_curve_get_tls_group(const struct l_ecc_curve *curve);
struct l_ecc_scalar *l_ecc_curve_get_order(const struct l_ecc_curve *curve);
struct l_ecc_scalar *l_ecc_curve_get_prime(const struct l_ecc_curve *curve);
size_t l_ecc_curve_get_scalar_bytes(const struct l_ecc_curve *curve);
struct l_ecc_point *l_ecc_point_new(const struct l_ecc_curve *curve);
struct l_ecc_point *l_ecc_point_from_data(const struct l_ecc_curve *curve,
enum l_ecc_point_type type,
const void *data, size_t len);
struct l_ecc_point *l_ecc_point_from_sswu(const struct l_ecc_scalar *u);
struct l_ecc_point *l_ecc_point_clone(const struct l_ecc_point *p);
const struct l_ecc_curve *l_ecc_point_get_curve(const struct l_ecc_point *p);
ssize_t l_ecc_point_get_x(const struct l_ecc_point *p, void *x, size_t xlen);
ssize_t l_ecc_point_get_y(const struct l_ecc_point *p, void *y, size_t ylen);
bool l_ecc_point_y_isodd(const struct l_ecc_point *p);
ssize_t l_ecc_point_get_data(const struct l_ecc_point *p, void *buf, size_t len);
void l_ecc_point_free(struct l_ecc_point *p);
DEFINE_CLEANUP_FUNC(l_ecc_point_free);
struct l_ecc_scalar *l_ecc_scalar_new(const struct l_ecc_curve *curve,
const void *buf, size_t len);
struct l_ecc_scalar *l_ecc_scalar_clone(const struct l_ecc_scalar *s);
struct l_ecc_scalar *l_ecc_scalar_new_random(
const struct l_ecc_curve *curve);
struct l_ecc_scalar *l_ecc_scalar_new_modp(const struct l_ecc_curve *curve,
const void *buf, size_t len);
struct l_ecc_scalar *l_ecc_scalar_new_modn(const struct l_ecc_curve *curve,
const void *buf, size_t len);
struct l_ecc_scalar *l_ecc_scalar_new_reduced_1_to_n(
const struct l_ecc_curve *curve,
const void *buf, size_t len);
ssize_t l_ecc_scalar_get_data(const struct l_ecc_scalar *c, void *buf,
size_t len);
void l_ecc_scalar_free(struct l_ecc_scalar *c);
DEFINE_CLEANUP_FUNC(l_ecc_scalar_free);
/* Constant operations */
bool l_ecc_scalar_add(struct l_ecc_scalar *ret, const struct l_ecc_scalar *a,
const struct l_ecc_scalar *b,
const struct l_ecc_scalar *mod);
/* Point operations */
bool l_ecc_point_multiply(struct l_ecc_point *ret,
const struct l_ecc_scalar *scalar,
const struct l_ecc_point *point);
bool l_ecc_point_multiply_g(struct l_ecc_point *ret,
const struct l_ecc_scalar *scalar);
bool l_ecc_point_add(struct l_ecc_point *ret, const struct l_ecc_point *a,
const struct l_ecc_point *b);
bool l_ecc_point_inverse(struct l_ecc_point *p);
/* extra operations needed for SAE */
bool l_ecc_scalar_multiply(struct l_ecc_scalar *ret,
const struct l_ecc_scalar *a,
const struct l_ecc_scalar *b);
int l_ecc_scalar_legendre(struct l_ecc_scalar *value);
bool l_ecc_scalar_sum_x(struct l_ecc_scalar *ret, const struct l_ecc_scalar *x);
bool l_ecc_scalars_are_equal(const struct l_ecc_scalar *a,
const struct l_ecc_scalar *b);
bool l_ecc_points_are_equal(const struct l_ecc_point *a,
const struct l_ecc_point *b);
bool l_ecc_point_is_infinity(const struct l_ecc_point *p);
#ifdef __cplusplus
}
#endif
#endif /* __ELL_ECC_H */
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