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  */
16 struct 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  */
35 struct 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  */
51 const struct ecc_curve *ecc_get_curve(unsigned int curve_id);
52 
53 /**
54  * ecc_get_curve25519() - get curve25519 curve;
55  *
56  * Returns curve25519
57  */
58 const struct ecc_curve *ecc_get_curve25519(void);
59 
60 #endif
61