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 * @nbits: The number of bits of a curve. 27 * @g: Generator point of the curve. 28 * @p: Prime number, if Barrett's reduction is used for this curve 29 * pre-calculated value 'mu' is appended to the @p after ndigits. 30 * Use of Barrett's reduction is heuristically determined in 31 * vli_mmod_fast(). 32 * @n: Order of the curve group. 33 * @a: Curve parameter a. 34 * @b: Curve parameter b. 35 */ 36 struct ecc_curve { 37 char *name; 38 u32 nbits; 39 struct ecc_point g; 40 u64 *p; 41 u64 *n; 42 u64 *a; 43 u64 *b; 44 }; 45 46 /** 47 * ecc_get_curve() - get elliptic curve; 48 * @curve_id: Curves IDs: 49 * defined in 'include/crypto/ecdh.h'; 50 * 51 * Returns curve if get curve succssful, NULL otherwise 52 */ 53 const struct ecc_curve *ecc_get_curve(unsigned int curve_id); 54 55 /** 56 * ecc_get_curve25519() - get curve25519 curve; 57 * 58 * Returns curve25519 59 */ 60 const struct ecc_curve *ecc_get_curve25519(void); 61 62 #endif 63