mirror of
https://github.com/tillitis/tillitis-key1.git
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78 lines
1.4 KiB
C
78 lines
1.4 KiB
C
/*
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* Copyright (C) 2022-2024 - Tillitis AB
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* SPDX-License-Identifier: GPL-2.0-only
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*/
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#include "lib.h"
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#include "assert.h"
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#include <stddef.h>
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#include <stdint.h>
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#include <stdbool.h>
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void *memset(void *dest, int c, unsigned n)
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{
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uint8_t *s = dest;
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for (; n; n--, s++)
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*s = (uint8_t)c;
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/*@ -temptrans @*/
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return dest;
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}
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void memcpy_s(void *dest, size_t destsize, const void *src, size_t n)
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{
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assert(dest != NULL);
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assert(src != NULL);
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assert(destsize >= n);
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uint8_t *src_byte = (uint8_t *)src;
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uint8_t *dest_byte = (uint8_t *)dest;
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for (size_t i = 0; i < n; i++) {
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/*@ -nullderef @*/
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/* splint complains that dest_byte and src_byte can be
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* NULL, but it seems it doesn't understand assert.
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* See above.
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*/
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dest_byte[i] = src_byte[i];
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}
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}
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void wordcpy_s(void *dest, size_t destsize, const void *src, size_t n)
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{
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assert(dest != NULL);
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assert(src != NULL);
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assert(destsize >= n);
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uint32_t *src_word = (uint32_t *)src;
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uint32_t *dest_word = (uint32_t *)dest;
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for (size_t i = 0; i < n; i++) {
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dest_word[i] = src_word[i];
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}
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}
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bool memeq(void *dest, const void *src, size_t n)
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{
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uint8_t *src_byte = (uint8_t *)src;
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uint8_t *dest_byte = (uint8_t *)dest;
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bool res = true;
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for (size_t i = 0; i < n; i++) {
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if (dest_byte[i] != src_byte[i]) {
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res = false;
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}
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}
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return res;
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}
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void secure_wipe(void *v, size_t n)
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{
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volatile uint8_t *p = (volatile uint8_t *)v;
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while (n--)
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*p++ = 0;
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}
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