Commit 14bb7676 authored by Meng Yu's avatar Meng Yu Committed by Herbert Xu
Browse files

crypto: ecc - expose ecc curves 



Move 'ecc_get_curve' to 'include/crypto/ecc_curve.h', so everyone
in kernel tree can easily get ecc curve params;

Signed-off-by: default avatarMeng Yu <yumeng18@huawei.com>
Reviewed-by: default avatarZaibo Xu <xuzaibo@huawei.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 6763f5ea

crypto/ecc.c

+4 −1
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */



#include <crypto/ecc_curve.h>

#include <linux/module.h>

#include <linux/random.h>

#include <linux/slab.h>
@@ -42,7 +43,8 @@ typedef struct { 
	u64 m_high;

} uint128_t;



static inline const struct ecc_curve *ecc_get_curve(unsigned int curve_id)



const struct ecc_curve *ecc_get_curve(unsigned int curve_id)

{

	switch (curve_id) {

	/* In FIPS mode only allow P256 and higher */
@@ -54,6 +56,7 @@ static inline const struct ecc_curve *ecc_get_curve(unsigned int curve_id) 
		return NULL;

	}

}

EXPORT_SYMBOL(ecc_get_curve);



static u64 *ecc_alloc_digits_space(unsigned int ndigits)

{

crypto/ecc.h

+2 −35
Original line number Diff line number Diff line
@@ -26,6 +26,8 @@ 
#ifndef _CRYPTO_ECC_H

#define _CRYPTO_ECC_H



#include <crypto/ecc_curve.h>



/* One digit is u64 qword. */

#define ECC_CURVE_NIST_P192_DIGITS  3

#define ECC_CURVE_NIST_P256_DIGITS  4
@@ -33,43 +35,8 @@ 


#define ECC_DIGITS_TO_BYTES_SHIFT 3



/**

 * 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;

};



#define ECC_POINT_INIT(x, y, ndigits)	(struct ecc_point) { x, y, 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_is_key_valid() - Validate a given ECDH private key

 *

include/crypto/ecc_curve.h

0 → 100644
+53 −0
Original line number Diff line number Diff line 
/* 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);



#endif