niceSOFT/libssh2: the SSH library

src/mac.h
70 строк3 KB
Viktor Szakats
support encrypt-then-mac (etm) MACs (#987)
21 апр 2023, 12:23
21 апр 2023, 12:230048f30
#ifndef __LIBSSH2_MAC_H
#define __LIBSSH2_MAC_H
/* Copyright (C) 2009-2010 by Daniel Stenberg
 *
 * 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 the copyright holder nor the names
 *   of any other 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 "libssh2_priv.h"

struct _LIBSSH2_MAC_METHOD
{
    const char *name;

    /* The length of a given MAC packet */
    int mac_len;

    /* integrity key length */
    int key_len;

    /* Message Authentication Code Hashing algo */
    int (*init) (LIBSSH2_SESSION * session, unsigned char *key, int *free_key,
                 void **abstract);
    int (*hash) (LIBSSH2_SESSION * session, unsigned char *buf,
                 uint32_t seqno, const unsigned char *packet,
                 size_t packet_len, const unsigned char *addtl,
                 size_t addtl_len, void **abstract);
    int (*dtor) (LIBSSH2_SESSION * session, void **abstract);

    int etm; /* encrypt-then-mac */
};

typedef struct _LIBSSH2_MAC_METHOD LIBSSH2_MAC_METHOD;

const LIBSSH2_MAC_METHOD **_libssh2_mac_methods(void);
const LIBSSH2_MAC_METHOD *_libssh2_mac_override(
        const LIBSSH2_CRYPT_METHOD *crypt);

#endif /* __LIBSSH2_MAC_H */