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crypto: ecc - expose ecc curves

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

Signed-off-by: Meng Yu <yumeng18@huawei.com>
Reviewed-by: Zaibo Xu <xuzaibo@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Meng Yu 2021-03-04 14:35:47 +08:00 committed by Herbert Xu
parent 6763f5ea2d
commit 14bb767682
3 changed files with 59 additions and 36 deletions
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5
crypto/ecc.c
View File

@ -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)
{

37
crypto/ecc.h
View File

@ -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
*

53
include/crypto/ecc_curve.h Normal file
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@ -0,0 +1,53 @@
/* 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