185 lines
6.2 KiB
C
185 lines
6.2 KiB
C
/* fe_operations.h
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*
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* Copyright (C) 2006-2023 wolfSSL Inc.
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*
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* This file is part of wolfSSL.
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*
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* wolfSSL is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* wolfSSL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
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*/
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#ifndef WOLF_CRYPT_FE_OPERATIONS_H
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#define WOLF_CRYPT_FE_OPERATIONS_H
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#include <wolfssl/wolfcrypt/settings.h>
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#if defined(HAVE_CURVE25519) || defined(HAVE_ED25519)
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#include <wolfssl/wolfcrypt/types.h>
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#if defined(USE_INTEL_SPEEDUP) && !defined(NO_CURVED25519_X64)
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#define CURVED25519_X64
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#elif defined(HAVE___UINT128_T) && !defined(NO_CURVED25519_128BIT)
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#define CURVED25519_128BIT
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#endif
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#if defined(CURVED25519_X64)
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#define CURVED25519_ASM_64BIT
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#define CURVED25519_ASM
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#endif
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#if defined(WOLFSSL_ARMASM)
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#ifdef __aarch64__
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#define CURVED25519_ASM_64BIT
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#else
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#define CURVED25519_ASM_32BIT
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#endif
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#define CURVED25519_ASM
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#endif
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/*
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fe means field element.
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Here the field is \Z/(2^255-19).
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An element t, entries t[0]...t[9], represents the integer
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t[0]+2^26 t[1]+2^51 t[2]+2^77 t[3]+2^102 t[4]+...+2^230 t[9].
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Bounds on each t[i] vary depending on context.
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if defined(CURVE25519_SMALL) || defined(ED25519_SMALL)
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#define F25519_SIZE 32
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WOLFSSL_LOCAL void lm_copy(byte*, const byte*);
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WOLFSSL_LOCAL void lm_add(byte*, const byte*, const byte*);
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WOLFSSL_LOCAL void lm_sub(byte*, const byte*, const byte*);
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WOLFSSL_LOCAL void lm_neg(byte*,const byte*);
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WOLFSSL_LOCAL void lm_invert(byte*, const byte*);
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WOLFSSL_LOCAL void lm_mul(byte*,const byte*,const byte*);
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#endif
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#if !defined(FREESCALE_LTC_ECC)
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WOLFSSL_LOCAL void fe_init(void);
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WOLFSSL_LOCAL int curve25519(byte * q, const byte * n, const byte * p);
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#endif
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/* default to be faster but take more memory */
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#if !defined(CURVE25519_SMALL) || !defined(ED25519_SMALL)
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#ifdef CURVED25519_ASM_64BIT
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typedef sword64 fe[4];
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#elif defined(CURVED25519_ASM_32BIT)
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typedef sword32 fe[8];
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#elif defined(CURVED25519_128BIT)
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typedef sword64 fe[5];
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#else
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typedef sword32 fe[10];
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#endif
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WOLFSSL_LOCAL void fe_copy(fe h,const fe f);
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WOLFSSL_LOCAL void fe_add(fe h,const fe f,const fe g);
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WOLFSSL_LOCAL void fe_neg(fe h,const fe f);
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WOLFSSL_LOCAL void fe_sub(fe h,const fe f,const fe g);
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WOLFSSL_LOCAL void fe_invert(fe out,const fe z);
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WOLFSSL_LOCAL void fe_mul(fe h,const fe f,const fe g);
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/* Based On Daniel J Bernstein's curve25519 and ed25519 Public Domain ref10
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work. */
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WOLFSSL_LOCAL void fe_0(fe h);
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WOLFSSL_LOCAL void fe_1(fe h);
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WOLFSSL_LOCAL int fe_isnonzero(const fe f);
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WOLFSSL_LOCAL int fe_isnegative(const fe f);
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WOLFSSL_LOCAL void fe_tobytes(unsigned char *s,const fe h);
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WOLFSSL_LOCAL void fe_sq(fe h,const fe f);
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WOLFSSL_LOCAL void fe_sq2(fe h,const fe f);
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WOLFSSL_LOCAL void fe_frombytes(fe h,const unsigned char *s);
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WOLFSSL_LOCAL void fe_cswap(fe f, fe g, int b);
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WOLFSSL_LOCAL void fe_mul121666(fe h,fe f);
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WOLFSSL_LOCAL void fe_cmov(fe f, const fe g, int b);
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WOLFSSL_LOCAL void fe_pow22523(fe out,const fe z);
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/* 64 type needed for SHA512 */
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WOLFSSL_LOCAL word64 load_3(const unsigned char *in);
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WOLFSSL_LOCAL word64 load_4(const unsigned char *in);
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#ifdef CURVED25519_ASM
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WOLFSSL_LOCAL void fe_cmov_table(fe* r, fe* base, signed char b);
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#endif /* CURVED25519_ASM */
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#endif /* !CURVE25519_SMALL || !ED25519_SMALL */
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/* Use less memory and only 32bit types or less, but is slower
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Based on Daniel Beer's public domain work. */
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#if defined(CURVE25519_SMALL) || defined(ED25519_SMALL)
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static const byte c25519_base_x[F25519_SIZE] = {9};
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static const byte f25519_zero[F25519_SIZE] = {0};
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static const byte f25519_one[F25519_SIZE] = {1};
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static const byte fprime_zero[F25519_SIZE] = {0};
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static const byte fprime_one[F25519_SIZE] = {1};
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WOLFSSL_LOCAL void fe_load(byte *x, word32 c);
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WOLFSSL_LOCAL void fe_normalize(byte *x);
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WOLFSSL_LOCAL void fe_inv__distinct(byte *r, const byte *x);
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/* Conditional copy. If condition == 0, then zero is copied to dst. If
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* condition == 1, then one is copied to dst. Any other value results in
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* undefined behavior.
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*/
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WOLFSSL_LOCAL void fe_select(byte *dst, const byte *zero, const byte *one,
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byte condition);
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/* Multiply a point by a small constant. The two pointers are not
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* required to be distinct.
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*
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* The constant must be less than 2^24.
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*/
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WOLFSSL_LOCAL void fe_mul_c(byte *r, const byte *a, word32 b);
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WOLFSSL_LOCAL void fe_mul__distinct(byte *r, const byte *a, const byte *b);
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/* Compute one of the square roots of the field element, if the element
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* is square. The other square is -r.
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*
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* If the input is not square, the returned value is a valid field
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* element, but not the correct answer. If you don't already know that
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* your element is square, you should square the return value and test.
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*/
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WOLFSSL_LOCAL void fe_sqrt(byte *r, const byte *x);
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/* Conditional copy. If condition == 0, then zero is copied to dst. If
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* condition == 1, then one is copied to dst. Any other value results in
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* undefined behavior.
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*/
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WOLFSSL_LOCAL void fprime_select(byte *dst, const byte *zero, const byte *one,
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byte condition);
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WOLFSSL_LOCAL void fprime_add(byte *r, const byte *a, const byte *modulus);
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WOLFSSL_LOCAL void fprime_sub(byte *r, const byte *a, const byte *modulus);
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WOLFSSL_LOCAL void fprime_mul(byte *r, const byte *a, const byte *b,
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const byte *modulus);
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WOLFSSL_LOCAL void fprime_copy(byte *x, const byte *a);
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#endif /* CURVE25519_SMALL || ED25519_SMALL */
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* HAVE_CURVE25519 || HAVE_ED25519 */
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#endif /* WOLF_CRYPT_FE_OPERATIONS_H */
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