/* fe_operations.h * * Copyright (C) 2006-2023 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 #if defined(HAVE_CURVE25519) || defined(HAVE_ED25519) #include #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_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 */