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- /* fe_operations.h
- *
- * Copyright (C) 2006-2022 wolfSSL Inc.
- *
- * This file is part of wolfSSL.
- *
- * wolfSSL is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * wolfSSL is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
- */
- #ifndef WOLF_CRYPT_FE_OPERATIONS_H
- #define WOLF_CRYPT_FE_OPERATIONS_H
- #include <wolfssl/wolfcrypt/settings.h>
- #if defined(HAVE_CURVE25519) || defined(HAVE_ED25519)
- #include <wolfssl/wolfcrypt/types.h>
- #if defined(USE_INTEL_SPEEDUP) && !defined(NO_CURVED25519_X64)
- #define CURVED25519_X64
- #elif defined(HAVE___UINT128_T) && !defined(NO_CURVED25519_128BIT)
- #define CURVED25519_128BIT
- #endif
- #if defined(CURVED25519_X64)
- #define CURVED25519_ASM_64BIT
- #define CURVED25519_ASM
- #endif
- #if defined(WOLFSSL_ARMASM)
- #ifdef __aarch64__
- #define CURVED25519_ASM_64BIT
- #else
- #define CURVED25519_ASM_32BIT
- #endif
- #define CURVED25519_ASM
- #endif
- /*
- fe means field element.
- Here the field is \Z/(2^255-19).
- An element t, entries t[0]...t[9], represents the integer
- t[0]+2^26 t[1]+2^51 t[2]+2^77 t[3]+2^102 t[4]+...+2^230 t[9].
- Bounds on each t[i] vary depending on context.
- */
- #ifdef __cplusplus
- extern "C" {
- #endif
- #if defined(CURVE25519_SMALL) || defined(ED25519_SMALL)
- #define F25519_SIZE 32
- WOLFSSL_LOCAL void lm_copy(byte*, const byte*);
- WOLFSSL_LOCAL void lm_add(byte*, const byte*, const byte*);
- WOLFSSL_LOCAL void lm_sub(byte*, const byte*, const byte*);
- WOLFSSL_LOCAL void lm_neg(byte*,const byte*);
- WOLFSSL_LOCAL void lm_invert(byte*, const byte*);
- WOLFSSL_LOCAL void lm_mul(byte*,const byte*,const byte*);
- #endif
- #if !defined(FREESCALE_LTC_ECC)
- WOLFSSL_LOCAL void fe_init(void);
- WOLFSSL_LOCAL int curve25519(byte * q, const byte * n, const byte * p);
- #endif
- /* default to be faster but take more memory */
- #if !defined(CURVE25519_SMALL) || !defined(ED25519_SMALL)
- #ifdef CURVED25519_ASM_64BIT
- typedef sword64 fe[4];
- #elif defined(CURVED25519_ASM_32BIT)
- typedef sword32 fe[8];
- #elif defined(CURVED25519_128BIT)
- typedef sword64 fe[5];
- #else
- typedef sword32 fe[10];
- #endif
- WOLFSSL_LOCAL void fe_copy(fe h,const fe f);
- WOLFSSL_LOCAL void fe_add(fe h,const fe f,const fe g);
- WOLFSSL_LOCAL void fe_neg(fe h,const fe f);
- WOLFSSL_LOCAL void fe_sub(fe h,const fe f,const fe g);
- WOLFSSL_LOCAL void fe_invert(fe out,const fe z);
- WOLFSSL_LOCAL void fe_mul(fe h,const fe f,const fe g);
- /* Based On Daniel J Bernstein's curve25519 and ed25519 Public Domain ref10
- work. */
- WOLFSSL_LOCAL void fe_0(fe h);
- WOLFSSL_LOCAL void fe_1(fe h);
- WOLFSSL_LOCAL int fe_isnonzero(const fe f);
- WOLFSSL_LOCAL int fe_isnegative(const fe f);
- WOLFSSL_LOCAL void fe_tobytes(unsigned char *s,const fe h);
- WOLFSSL_LOCAL void fe_sq(fe h,const fe f);
- WOLFSSL_LOCAL void fe_sq2(fe h,const fe f);
- WOLFSSL_LOCAL void fe_frombytes(fe h,const unsigned char *s);
- WOLFSSL_LOCAL void fe_cswap(fe f, fe g, int b);
- WOLFSSL_LOCAL void fe_mul121666(fe h,fe f);
- WOLFSSL_LOCAL void fe_cmov(fe f, const fe g, int b);
- WOLFSSL_LOCAL void fe_pow22523(fe out,const fe z);
- /* 64 type needed for SHA512 */
- WOLFSSL_LOCAL word64 load_3(const unsigned char *in);
- WOLFSSL_LOCAL word64 load_4(const unsigned char *in);
- #ifdef CURVED25519_ASM
- WOLFSSL_LOCAL void fe_ge_to_p2(fe rx, fe ry, fe rz, const fe px, const fe py,
- const fe pz, const fe pt);
- WOLFSSL_LOCAL void fe_ge_to_p3(fe rx, fe ry, fe rz, fe rt, const fe px,
- const fe py, const fe pz, const fe pt);
- WOLFSSL_LOCAL void fe_ge_dbl(fe rx, fe ry, fe rz, fe rt, const fe px,
- const fe py, const fe pz);
- WOLFSSL_LOCAL void fe_ge_madd(fe rx, fe ry, fe rz, fe rt, const fe px,
- const fe py, const fe pz, const fe pt,
- const fe qxy2d, const fe qyplusx,
- const fe qyminusx);
- WOLFSSL_LOCAL void fe_ge_msub(fe rx, fe ry, fe rz, fe rt, const fe px,
- const fe py, const fe pz, const fe pt,
- const fe qxy2d, const fe qyplusx,
- const fe qyminusx);
- WOLFSSL_LOCAL void fe_ge_add(fe rx, fe ry, fe rz, fe rt, const fe px,
- const fe py, const fe pz, const fe pt, const fe qz,
- const fe qt2d, const fe qyplusx,
- const fe qyminusx);
- WOLFSSL_LOCAL void fe_ge_sub(fe rx, fe ry, fe rz, fe rt, const fe px,
- const fe py, const fe pz, const fe pt, const fe qz,
- const fe qt2d, const fe qyplusx,
- const fe qyminusx);
- WOLFSSL_LOCAL void fe_cmov_table(fe* r, fe* base, signed char b);
- #endif /* CURVED25519_ASM */
- #endif /* !CURVE25519_SMALL || !ED25519_SMALL */
- /* Use less memory and only 32bit types or less, but is slower
- Based on Daniel Beer's public domain work. */
- #if defined(CURVE25519_SMALL) || defined(ED25519_SMALL)
- static const byte c25519_base_x[F25519_SIZE] = {9};
- static const byte f25519_zero[F25519_SIZE] = {0};
- static const byte f25519_one[F25519_SIZE] = {1};
- static const byte fprime_zero[F25519_SIZE] = {0};
- static const byte fprime_one[F25519_SIZE] = {1};
- WOLFSSL_LOCAL void fe_load(byte *x, word32 c);
- WOLFSSL_LOCAL void fe_normalize(byte *x);
- WOLFSSL_LOCAL void fe_inv__distinct(byte *r, const byte *x);
- /* Conditional copy. If condition == 0, then zero is copied to dst. If
- * condition == 1, then one is copied to dst. Any other value results in
- * undefined behavior.
- */
- WOLFSSL_LOCAL void fe_select(byte *dst, const byte *zero, const byte *one,
- byte condition);
- /* Multiply a point by a small constant. The two pointers are not
- * required to be distinct.
- *
- * The constant must be less than 2^24.
- */
- WOLFSSL_LOCAL void fe_mul_c(byte *r, const byte *a, word32 b);
- WOLFSSL_LOCAL void fe_mul__distinct(byte *r, const byte *a, const byte *b);
- /* Compute one of the square roots of the field element, if the element
- * is square. The other square is -r.
- *
- * If the input is not square, the returned value is a valid field
- * element, but not the correct answer. If you don't already know that
- * your element is square, you should square the return value and test.
- */
- WOLFSSL_LOCAL void fe_sqrt(byte *r, const byte *x);
- /* Conditional copy. If condition == 0, then zero is copied to dst. If
- * condition == 1, then one is copied to dst. Any other value results in
- * undefined behavior.
- */
- WOLFSSL_LOCAL void fprime_select(byte *dst, const byte *zero, const byte *one,
- byte condition);
- WOLFSSL_LOCAL void fprime_add(byte *r, const byte *a, const byte *modulus);
- WOLFSSL_LOCAL void fprime_sub(byte *r, const byte *a, const byte *modulus);
- WOLFSSL_LOCAL void fprime_mul(byte *r, const byte *a, const byte *b,
- const byte *modulus);
- WOLFSSL_LOCAL void fprime_copy(byte *x, const byte *a);
- #endif /* CURVE25519_SMALL || ED25519_SMALL */
- #ifdef __cplusplus
- } /* extern "C" */
- #endif
- #endif /* HAVE_CURVE25519 || HAVE_ED25519 */
- #endif /* WOLF_CRYPT_FE_OPERATIONS_H */
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