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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2021 HiSilicon */
#ifndef _CRYTO_ECC_CURVE_H
#define _CRYTO_ECC_CURVE_H
#include <linux/types.h>
/**
* struct ecc_point - elliptic curve point in affine coordinates
*
* @x: X coordinate in vli form.
* @y: Y coordinate in vli form.
* @ndigits: Length of vlis in u64 qwords.
*/
struct ecc_point {
u64 *x;
u64 *y;
u8 ndigits;
};
/**
* struct ecc_curve - definition of elliptic curve
*
* @name: Short name of the curve.
* @g: Generator point of the curve.
* @p: Prime number, if Barrett's reduction is used for this curve
* pre-calculated value 'mu' is appended to the @p after ndigits.
* Use of Barrett's reduction is heuristically determined in
* vli_mmod_fast().
* @n: Order of the curve group.
* @a: Curve parameter a.
* @b: Curve parameter b.
*/
struct ecc_curve {
char *name;
struct ecc_point g;
u64 *p;
u64 *n;
u64 *a;
u64 *b;
};
/**
* ecc_get_curve() - get elliptic curve;
* @curve_id: Curves IDs:
* defined in 'include/crypto/ecdh.h';
*
* Returns curve if get curve succssful, NULL otherwise
*/
const struct ecc_curve *ecc_get_curve(unsigned int curve_id);
/**
* ecc_get_curve25519() - get curve25519 curve;
*
* Returns curve25519
*/
const struct ecc_curve *ecc_get_curve25519(void);
#endif
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