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c0d6bd1fd3
Add the number of bits a curve has to the ecc_curve definition to be able to derive the number of bytes a curve requires for its coordinates from it. It also allows one to identify a curve by its particular size. Set the number of bits on all curve definitions. Tested-by: Lukas Wunner <lukas@wunner.de> Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com> Reviewed-by: Vitaly Chikunov <vt@altlinux.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
62 lines
1.4 KiB
C
62 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2021 HiSilicon */
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#ifndef _CRYTO_ECC_CURVE_H
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#define _CRYTO_ECC_CURVE_H
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#include <linux/types.h>
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/**
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* struct ecc_point - elliptic curve point in affine coordinates
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*
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* @x: X coordinate in vli form.
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* @y: Y coordinate in vli form.
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* @ndigits: Length of vlis in u64 qwords.
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*/
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struct ecc_point {
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u64 *x;
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u64 *y;
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u8 ndigits;
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};
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/**
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* struct ecc_curve - definition of elliptic curve
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*
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* @name: Short name of the curve.
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* @nbits: The number of bits of a curve.
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* @g: Generator point of the curve.
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* @p: Prime number, if Barrett's reduction is used for this curve
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* pre-calculated value 'mu' is appended to the @p after ndigits.
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* Use of Barrett's reduction is heuristically determined in
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* vli_mmod_fast().
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* @n: Order of the curve group.
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* @a: Curve parameter a.
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* @b: Curve parameter b.
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*/
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struct ecc_curve {
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char *name;
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u32 nbits;
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struct ecc_point g;
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u64 *p;
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u64 *n;
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u64 *a;
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u64 *b;
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};
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/**
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* ecc_get_curve() - get elliptic curve;
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* @curve_id: Curves IDs:
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* defined in 'include/crypto/ecdh.h';
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*
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* Returns curve if get curve succssful, NULL otherwise
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*/
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const struct ecc_curve *ecc_get_curve(unsigned int curve_id);
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/**
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* ecc_get_curve25519() - get curve25519 curve;
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*
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* Returns curve25519
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*/
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const struct ecc_curve *ecc_get_curve25519(void);
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#endif
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