1 /* 2 * Copyright 2013-2022 The OpenSSL Project Authors. All Rights Reserved. 3 * Copyright (c) 2012, Intel Corporation. All Rights Reserved. 4 * 5 * Licensed under the OpenSSL license (the "License"). You may not use 6 * this file except in compliance with the License. You can obtain a copy 7 * in the file LICENSE in the source distribution or at 8 * https://www.openssl.org/source/license.html 9 * 10 * Originally written by Shay Gueron (1, 2), and Vlad Krasnov (1) 11 * (1) Intel Corporation, Israel Development Center, Haifa, Israel 12 * (2) University of Haifa, Israel 13 */ 14 15 #ifndef OSSL_CRYPTO_BN_RSAZ_EXP_H 16 # define OSSL_CRYPTO_BN_RSAZ_EXP_H 17 18 # undef RSAZ_ENABLED 19 # if defined(OPENSSL_BN_ASM_MONT) && \ 20 (defined(__x86_64) || defined(__x86_64__) || \ 21 defined(_M_AMD64) || defined(_M_X64)) 22 # define RSAZ_ENABLED 23 24 # include <openssl/bn.h> 25 # include "internal/constant_time.h" 26 # include "bn_local.h" 27 28 void RSAZ_1024_mod_exp_avx2(BN_ULONG result[16], 29 const BN_ULONG base_norm[16], 30 const BN_ULONG exponent[16], 31 const BN_ULONG m_norm[16], const BN_ULONG RR[16], 32 BN_ULONG k0); 33 int rsaz_avx2_eligible(void); 34 35 void RSAZ_512_mod_exp(BN_ULONG result[8], 36 const BN_ULONG base_norm[8], const BN_ULONG exponent[8], 37 const BN_ULONG m_norm[8], BN_ULONG k0, 38 const BN_ULONG RR[8]); 39 40 static ossl_inline void bn_select_words(BN_ULONG *r, BN_ULONG mask, 41 const BN_ULONG *a, 42 const BN_ULONG *b, size_t num) 43 { 44 size_t i; 45 46 for (i = 0; i < num; i++) { 47 r[i] = constant_time_select_64(mask, a[i], b[i]); 48 } 49 } 50 51 static ossl_inline BN_ULONG bn_reduce_once_in_place(BN_ULONG *r, 52 BN_ULONG carry, 53 const BN_ULONG *m, 54 BN_ULONG *tmp, size_t num) 55 { 56 carry -= bn_sub_words(tmp, r, m, num); 57 bn_select_words(r, carry, r /* tmp < 0 */, tmp /* tmp >= 0 */, num); 58 return carry; 59 } 60 61 # endif 62 63 #endif 64