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/* Copyright (c) 2015 Cryptography Research, Inc.
* Released under the MIT License. See LICENSE.txt for license information.
*/
/**
* @file utils.c
* @author Mike Hamburg
* @brief Decaf utility functions.
*/
#include <decaf/common.h>
void cryptonite_decaf_bzero (
void *s,
size_t size
) {
#ifdef __STDC_LIB_EXT1__
memset_s(s, size, 0, size);
#else
const size_t sw = sizeof(cryptonite_decaf_word_t);
volatile uint8_t *destroy = (volatile uint8_t *)s;
for (; size && ((uintptr_t)destroy)%sw; size--, destroy++)
*destroy = 0;
for (; size >= sw; size -= sw, destroy += sw)
*(volatile cryptonite_decaf_word_t *)destroy = 0;
for (; size; size--, destroy++)
*destroy = 0;
#endif
}
cryptonite_decaf_bool_t cryptonite_decaf_memeq (
const void *data1_,
const void *data2_,
size_t size
) {
const unsigned char *data1 = (const unsigned char *)data1_;
const unsigned char *data2 = (const unsigned char *)data2_;
unsigned char ret = 0;
for (; size; size--, data1++, data2++) {
ret |= *data1 ^ *data2;
}
return (((cryptonite_decaf_dword_t)ret) - 1) >> 8;
}
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