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/* utils.h - TinyCrypt interface to platform-dependent run-time operations */
/*
* Copyright (C) 2015 by 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.
*/
/**
* @file
* @brief Interface to platform-dependent run-time operations.
*
*/
#ifndef __TC_UTILS_H__
#define __TC_UTILS_H__
#include <stdint.h>
#define TC_SUCCESS 1
#define TC_FAIL 0
#define TC_RESEED_REQ -1
/**
* @brief Copy the the buffer 'from' to the buffer 'to'.
*
* @return returns TC_FAIL (0) if:
* from_len > to_len.
*/
uint32_t _copy(uint8_t *to, uint32_t to_len, const uint8_t *from, uint32_t from_len);
/**
* @brief Set the value 'val' into the buffer 'to', 'len' times.
*/
void _set(uint8_t *to, uint8_t val, uint32_t len);
/**
* @brief This is an AES specific doubling function, which utilizes the
* finite field used by AES.
*/
uint8_t _double_byte(uint8_t a);
#endif
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