112 lines
3.9 KiB
C
112 lines
3.9 KiB
C
/**
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* Copyright (c) 2019 - 2020, Nordic Semiconductor ASA
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form, except as embedded into a Nordic
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* Semiconductor ASA integrated circuit in a product or a software update for
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* such product, must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* 4. This software, with or without modification, must only be used with a
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* Nordic Semiconductor ASA integrated circuit.
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*
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* 5. Any software provided in binary form under this license must not be reverse
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* engineered, decompiled, modified and/or disassembled.
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*
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* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/**@file
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* @defgroup nrf_oberon Oberon cryptographic library
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* @{
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* @brief Highly optimized cryptographic algorithm implementation for Cortex-M0, Cortex-M4,
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* and Cortex-M33. Created by Oberon, under distribution license with Nordic Semiconductor ASA.
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* @}
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*
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* @defgroup nrf_oberon_constant_time Constant time APIs
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* @ingroup nrf_oberon
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* @{
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* @brief Timing-invariant functions to use with cryptography.
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*
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* Collection of timing-invariant implementations of basic functions.
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*/
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#ifndef OCRYPTO_CONSTANT_TIME_H
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#define OCRYPTO_CONSTANT_TIME_H
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#include <stddef.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* Variable length comparison.
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*
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* @param x Memory region to compare with @p y.
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* @param y Memory region to compare with @p x.
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* @param length Number of bytes to compare, @p length > 0.
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*
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* @retval 1 If @p x and @p y point to equal memory regions.
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* @retval 0 Otherwise.
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*/
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int ocrypto_constant_time_equal(const void *x, const void *y, size_t length);
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/**
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* Variable length compare to zero.
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*
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* @param x Pointer to memory region that will be compared.
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* @param length Number of bytes to compare, @p length > 0.
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*
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* @retval 1 If @p x is equal to a zero memory region.
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* @retval 0 Otherwise.
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*/
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int ocrypto_constant_time_is_zero(const void *x, size_t length);
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/**
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* Variable length copy.
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*
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* @param x Pointer to memory region to copy @p y to.
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* @param y Pointer to memory region to copy to @p x.
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* @param length Number of bytes to copy, @p length > 0.
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*/
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void ocrypto_constant_time_copy(void *x, const void *y, size_t length);
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/**
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* Variable length fill with zero.
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*
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* @param x Pointer to memory region to be filled with zero.
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* @param length Number of bytes to fill, @p length > 0.
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*/
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void ocrypto_constant_time_fill_zero(void *x, size_t length);
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#ifdef __cplusplus
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}
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#endif
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#endif /* #ifndef OCRYPTO_CONSTANT_TIME_H */
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/** @} */
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