1/* SPDX-License-Identifier: GPL-2.0 */
 2/* Copyright (c) 2021 HiSilicon */
 3
 4#ifndef _CRYTO_ECC_CURVE_H
 5#define _CRYTO_ECC_CURVE_H
 6
 7#include <linux/types.h>
 8
 9/**
10 * struct ecc_point - elliptic curve point in affine coordinates
11 *
12 * @x:		X coordinate in vli form.
13 * @y:		Y coordinate in vli form.
14 * @ndigits:	Length of vlis in u64 qwords.
15 */
16struct ecc_point {
17	u64 *x;
18	u64 *y;
19	u8 ndigits;
20};
21
22/**
23 * struct ecc_curve - definition of elliptic curve
24 *
25 * @name:	Short name of the curve.
26 * @g:		Generator point of the curve.
27 * @p:		Prime number, if Barrett's reduction is used for this curve
28 *		pre-calculated value 'mu' is appended to the @p after ndigits.
29 *		Use of Barrett's reduction is heuristically determined in
30 *		vli_mmod_fast().
31 * @n:		Order of the curve group.
32 * @a:		Curve parameter a.
33 * @b:		Curve parameter b.
34 */
35struct ecc_curve {
36	char *name;
37	struct ecc_point g;
38	u64 *p;
39	u64 *n;
40	u64 *a;
41	u64 *b;
42};
43
44/**
45 * ecc_get_curve() - get elliptic curve;
46 * @curve_id:           Curves IDs:
47 *                      defined in 'include/crypto/ecdh.h';
48 *
49 * Returns curve if get curve succssful, NULL otherwise
50 */
51const struct ecc_curve *ecc_get_curve(unsigned int curve_id);
52
53/**
54 * ecc_get_curve25519() - get curve25519 curve;
55 *
56 * Returns curve25519
57 */
58const struct ecc_curve *ecc_get_curve25519(void);
59
60#endif