/* 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;

}