niceSOFT/libssh | Gitverse

src/crypto_common.c

36 строк1 KB

Andreas Schneider

crypto: Use stdint types and make code more readable of secure_memcmp()

20 июн 2022, 10:18

20 июн 2022, 10:1865256ad

/*
 * This file is part of the SSH Library
 *
 * Copyright (c) 2020 by Anderson Toshiyuki Sasaki - Red Hat, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "config.h"
#include "libssh/crypto.h"

int secure_memcmp(const void *s1, const void *s2, size_t n)
{
    size_t i;
    uint8_t status = 0;
    const uint8_t *p1 = s1;
    const uint8_t *p2 = s2;

    for (i = 0; i < n; i++) {
        status |= (p1[i] ^ p2[i]);
    }

    return (status != 0);
}