crypto_null.c

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/*
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 * You can also choose to distribute this program under the terms of
 * the Unmodified Binary Distribution Licence (as given in the file
 * COPYING.UBDL), provided that you have satisfied its requirements.
 */

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
FILE_SECBOOT ( PERMITTED );

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

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

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

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

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,
};

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

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

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

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

void cipher_null_auth ( void *ctx __unused, void *auth __unused ) {
        /* Do nothing */
}

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

int pubkey_null_encrypt ( const struct asn1_cursor *key __unused,
                          const struct asn1_cursor *plaintext __unused,
                          struct asn1_builder *ciphertext __unused ) {
        return 0;
}

int pubkey_null_decrypt ( const struct asn1_cursor *key __unused,
                          const struct asn1_cursor *ciphertext __unused,
                          struct asn1_builder *plaintext __unused ) {
        return 0;
}

int pubkey_null_sign ( const struct asn1_cursor *key __unused,
                       struct digest_algorithm *digest __unused,
                       const void *value __unused,
                       struct asn1_builder *signature __unused ) {
        return 0;
}

int pubkey_null_verify ( const struct asn1_cursor *key __unused,
                         struct digest_algorithm *digest __unused,
                         const void *value __unused,
                         const struct asn1_cursor *signature __unused ) {
        return 0;
}

struct pubkey_algorithm pubkey_null = {
        .name = "null",
        .encrypt = pubkey_null_encrypt,
        .decrypt = pubkey_null_decrypt,
        .sign = pubkey_null_sign,
        .verify = pubkey_null_verify,
};