source: bootcd/isolinux/syslinux-6.03/gpxe/src/crypto/crypto_null.c

/*
 * Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or any later version.
 *
 * This program 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

FILE_LICENCE ( GPL2_OR_LATER );

/**
 * @file
 *
 * Null crypto algorithm
 */

#include <string.h>
#include <gpxe/crypto.h>

static void digest_null_init ( void *ctx __unused ) {
        /* Do nothing */
}

static void digest_null_update ( void *ctx __unused, const void *src __unused,
                                 size_t len __unused ) {
        /* Do nothing */
}

static void digest_null_final ( void *ctx __unused, void *out __unused ) {
        /* Do nothing */
}

struct digest_algorithm digest_null = {
        .name = "null",
        .ctxsize = 0,
        .blocksize = 1,
        .digestsize = 0,
        .init = digest_null_init,
        .update = digest_null_update,
        .final = digest_null_final,
};

static int cipher_null_setkey ( void *ctx __unused, const void *key __unused,
                                size_t keylen __unused ) {
        /* Do nothing */
        return 0;
}

static void cipher_null_setiv ( void *ctx __unused,
                                const void *iv __unused ) {
        /* Do nothing */
}

static void cipher_null_encrypt ( void *ctx __unused, const void *src,
                                  void *dst, size_t len ) {
        memcpy ( dst, src, len );
}

static void cipher_null_decrypt ( void *ctx __unused, const void *src,
                                  void *dst, size_t len ) {
        memcpy ( dst, src, len );
}

struct cipher_algorithm cipher_null = {
        .name = "null",
        .ctxsize = 0,
        .blocksize = 1,
        .setkey = cipher_null_setkey,
        .setiv = cipher_null_setiv,
        .encrypt = cipher_null_encrypt,
        .decrypt = cipher_null_decrypt,
};

struct pubkey_algorithm pubkey_null = {
        .name = "null",
        .ctxsize = 0,
};