ESP-IDF
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Outline
#include <tinycrypt/utils.h>
#include <tinycrypt/constants.h>
#include <string.h>
#define MASK_TWENTY_SEVEN
_copy(uint8_t *, unsigned int, const uint8_t *, unsigned int)
_set(void *, uint8_t, unsigned int)
_double_byte(uint8_t)
_compare(const uint8_t *, const uint8_t *, size_t)
Files
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SourceVuESP-IDF Framework and ExamplesESP-IDFcomponents/bt/esp_ble_mesh/common/tinycrypt/src/utils.c
 
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/* utils.c - TinyCrypt platform-dependent run-time operations */ /* * Copyright (C) 2017 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. *//* ... */ #include <tinycrypt/utils.h> #include <tinycrypt/constants.h> #include <string.h> #define MASK_TWENTY_SEVEN 0x1b unsigned int _copy(uint8_t *to, unsigned int to_len, const uint8_t *from, unsigned int from_len) { if (from_len <= to_len) { (void)memcpy(to, from, from_len); return from_len; }{...} else { return TC_CRYPTO_FAIL; }{...} }{ ... } void _set(void *to, uint8_t val, unsigned int len) { (void)memset(to, val, len); }{ ... } /* * Doubles the value of a byte for values up to 127. *//* ... */ uint8_t _double_byte(uint8_t a) { return ((a << 1) ^ ((a >> 7) * MASK_TWENTY_SEVEN)); }{ ... } int _compare(const uint8_t *a, const uint8_t *b, size_t size) { const uint8_t *tempa = a; const uint8_t *tempb = b; uint8_t result = 0; for (unsigned int i = 0; i < size; i++) { result |= tempa[i] ^ tempb[i]; }{...} return result; }{ ... }
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