ndn-lite
tc_utils.h
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1 /* utils.h - TinyCrypt interface to platform-dependent run-time operations */
2 
3 /*
4  * Copyright (C) 2017 by Intel Corporation, All Rights Reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions are met:
8  *
9  * - Redistributions of source code must retain the above copyright notice,
10  * this list of conditions and the following disclaimer.
11  *
12  * - Redistributions in binary form must reproduce the above copyright
13  * notice, this list of conditions and the following disclaimer in the
14  * documentation and/or other materials provided with the distribution.
15  *
16  * - Neither the name of Intel Corporation nor the names of its contributors
17  * may be used to endorse or promote products derived from this software
18  * without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30  * POSSIBILITY OF SUCH DAMAGE.
31  */
32 
39 #ifndef __TC_UTILS_H__
40 #define __TC_UTILS_H__
41 
42 #include <stdint.h>
43 #include <stddef.h>
44 
45 #ifdef __cplusplus
46 extern "C" {
47 #endif
48 
60 unsigned int _copy(uint8_t *to, unsigned int to_len,
61  const uint8_t *from, unsigned int from_len);
62 
70 void _set(void *to, uint8_t val, unsigned int len);
71 
72 /*
73  * @brief AES specific doubling function, which utilizes
74  * the finite field used by AES.
75  * @return Returns a^2
76  *
77  * @param a IN/OUT -- value to be doubled
78  */
79 uint8_t _double_byte(uint8_t a);
80 
81 /*
82  * @brief Constant-time algorithm to compare if two sequences of bytes are equal
83  * @return Returns 0 if equal, and non-zero otherwise
84  *
85  * @param a IN -- sequence of bytes a
86  * @param b IN -- sequence of bytes b
87  * @param size IN -- size of sequences a and b
88  */
89 int _compare(const uint8_t *a, const uint8_t *b, size_t size);
90 
91 #ifdef __cplusplus
92 }
93 #endif
94 
95 #endif /* __TC_UTILS_H__ */
_set
void _set(void *to, uint8_t val, unsigned int len)
Set the value 'val' into the buffer 'to', 'len' times.
Definition: tc_utils.c:51
_double_byte
uint8_t _double_byte(uint8_t a)
Definition: tc_utils.c:59
_compare
int _compare(const uint8_t *a, const uint8_t *b, size_t size)
Definition: tc_utils.c:64
_copy
unsigned int _copy(uint8_t *to, unsigned int to_len, const uint8_t *from, unsigned int from_len)
Copy the the buffer 'from' to the buffer 'to'.
Definition: tc_utils.c:40
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