/* utils.h - TinyCrypt interface to platform-dependent run-time operations */
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/*
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* Copyright (C) 2017 by Intel Corporation, All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of Intel Corporation nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 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
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @file
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* @brief Interface to platform-dependent run-time operations.
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*
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*/
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#ifndef __TC_UTILS_H__
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#define __TC_UTILS_H__
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#include <stdint.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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* @brief Copy the the buffer 'from' to the buffer 'to'.
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* @return returns TC_CRYPTO_SUCCESS (1)
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* returns TC_CRYPTO_FAIL (0) if:
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* from_len > to_len.
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*
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* @param to OUT -- destination buffer
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* @param to_len IN -- length of destination buffer
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* @param from IN -- origin buffer
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* @param from_len IN -- length of origin buffer
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*/
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unsigned int _copy(uint8_t *to, unsigned int to_len,
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const uint8_t *from, unsigned int from_len);
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/**
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* @brief Set the value 'val' into the buffer 'to', 'len' times.
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*
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* @param to OUT -- destination buffer
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* @param val IN -- value to be set in 'to'
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* @param len IN -- number of times the value will be copied
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*/
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void _set(void *to, uint8_t val, unsigned int len);
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/*
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* @brief AES specific doubling function, which utilizes
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* the finite field used by AES.
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* @return Returns a^2
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*
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* @param a IN/OUT -- value to be doubled
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*/
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uint8_t _double_byte(uint8_t a);
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/*
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* @brief Constant-time algorithm to compare if two sequences of bytes are equal
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* @return Returns 0 if equal, and non-zero otherwise
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*
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* @param a IN -- sequence of bytes a
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* @param b IN -- sequence of bytes b
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* @param size IN -- size of sequences a and b
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*/
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int _compare(const uint8_t *a, const uint8_t *b, size_t size);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __TC_UTILS_H__ */
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