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/* ====================================================================
*
*
* BSD LICENSE
*
* Copyright(c) 2016-2025 Intel Corporation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*
* ====================================================================
*/
/*
* This file is based on modified code from OpenSSL.
* This is needed because the constant time functions are not exported
* from OpenSSL forcing engines to have their own copy of the
* functionality.
* The code based on OpenSSL code is subject to the following license:
*/
/*
* Copyright 2014-2016 The OpenSSL Project Authors. 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
*/
/*****************************************************************************
* @file qat_constant_time.h
*
* This file provides constant time functions
*
*****************************************************************************/
#ifndef QAT_CONST_TIME_H
# define QAT_CONST_TIME_H
#ifdef __cplusplus
extern "C" {
#endif
#pragma GCC push_options
#pragma GCC optimize ("O0")
static inline unsigned int value_barrier(unsigned int a)
{
volatile unsigned int r = a;
return r;
}
static inline unsigned int qat_constant_time_select(unsigned int mask,
unsigned int a,
unsigned int b)
{
return (value_barrier(mask) & a) | (value_barrier(~mask) & b);
}
static inline unsigned char qat_constant_time_select_8(unsigned char mask,
unsigned char a,
unsigned char b)
{
return (unsigned char)qat_constant_time_select(mask, a, b);
}
static inline unsigned int qat_constant_time_msb(unsigned int a)
{
return 0 - (a >> (sizeof(a) * 8 - 1));
}
static inline unsigned int qat_constant_time_lt(unsigned int a,
unsigned int b)
{
return qat_constant_time_msb(a ^ ((a ^ b) | ((a - b) ^ b)));
}
static inline unsigned int qat_constant_time_ge(unsigned int a,
unsigned int b)
{
return ~qat_constant_time_lt(a, b);
}
static inline unsigned char qat_constant_time_ge_8(unsigned int a,
unsigned int b)
{
return (unsigned char)(qat_constant_time_ge(a, b));
}
static inline unsigned int qat_constant_time_is_zero(unsigned int a)
{
return qat_constant_time_msb(~a & (a - 1));
}
static inline unsigned int qat_constant_time_eq(unsigned int a,
unsigned int b)
{
return qat_constant_time_is_zero(a ^ b);
}
static inline unsigned char qat_constant_time_is_zero_8(unsigned int a)
{
return (unsigned char)qat_constant_time_is_zero(a);
}
static inline size_t value_barrier_s(size_t a)
{
volatile size_t r = a;
return r;
}
static inline size_t qat_constant_time_select_s(size_t mask,
size_t a,
size_t b)
{
return (value_barrier_s(mask) & a) | (value_barrier_s(~mask) & b);
}
static inline size_t qat_constant_time_msb_s(size_t a)
{
return 0 - (a >> (sizeof(a) * 8 - 1));
}
static inline int qat_constant_time_select_int(unsigned int mask, int a,
int b)
{
return (int)qat_constant_time_select(mask, (unsigned)(a), (unsigned)(b));
}
/* This function works like qat_constant_time_select but
* operates on pointer types. This would return either
* "a" (if "i" is 1) or "b" (if "i" is 0). */
static inline void *qat_constant_time_select_ptr(int i, void *a, void *b)
{
/* i should be 0 or 1 to avoid running into pointer issues. */
i = i & 1;
intptr_t time_int_result = ((~(i - 1)) & (intptr_t)a) | ((i - 1) & (intptr_t)b);
return (void *)time_int_result;
}
/* This function returns 1 in case of a<=b else 0. */
static inline int qat_constant_time_le_int(int a, int b)
{
return !(((b + (~a + 1)) >> (sizeof(int) * 8 - 1)) & 1);
}
#pragma GCC pop_options
#ifdef __cplusplus
}
#endif
#endif /* QAT_CONST_TIME_H */
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