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/*
* Copyright 2013-2022 The OpenSSL Project Authors. All Rights Reserved.
* Copyright (c) 2012, Intel Corporation. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*
* Originally written by Shay Gueron (1, 2), and Vlad Krasnov (1)
* (1) Intel Corporation, Israel Development Center, Haifa, Israel
* (2) University of Haifa, Israel
*/
#ifndef OSSL_CRYPTO_BN_RSAZ_EXP_H
# define OSSL_CRYPTO_BN_RSAZ_EXP_H
# undef RSAZ_ENABLED
# if defined(OPENSSL_BN_ASM_MONT) && \
(defined(__x86_64) || defined(__x86_64__) || \
defined(_M_AMD64) || defined(_M_X64))
# define RSAZ_ENABLED
# include <openssl/bn.h>
# include "internal/constant_time.h"
# include "bn_local.h"
void RSAZ_1024_mod_exp_avx2(BN_ULONG result[16],
const BN_ULONG base_norm[16],
const BN_ULONG exponent[16],
const BN_ULONG m_norm[16], const BN_ULONG RR[16],
BN_ULONG k0);
int rsaz_avx2_eligible(void);
void RSAZ_512_mod_exp(BN_ULONG result[8],
const BN_ULONG base_norm[8], const BN_ULONG exponent[8],
const BN_ULONG m_norm[8], BN_ULONG k0,
const BN_ULONG RR[8]);
static ossl_inline void bn_select_words(BN_ULONG *r, BN_ULONG mask,
const BN_ULONG *a,
const BN_ULONG *b, size_t num)
{
size_t i;
for (i = 0; i < num; i++) {
r[i] = constant_time_select_64(mask, a[i], b[i]);
}
}
static ossl_inline BN_ULONG bn_reduce_once_in_place(BN_ULONG *r,
BN_ULONG carry,
const BN_ULONG *m,
BN_ULONG *tmp, size_t num)
{
carry -= bn_sub_words(tmp, r, m, num);
bn_select_words(r, carry, r /* tmp < 0 */, tmp /* tmp >= 0 */, num);
return carry;
}
# endif
#endif
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