src/crypto/crypto_null.c

   1 /*
   2  * Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 FILE_LICENCE ( GPL2_OR_LATER );
  20
  21 /**
  22  * @file
  23  *
  24  * Null crypto algorithm
  25  */
  26
  27 #include <string.h>
  28 #include <gpxe/crypto.h>
  29
  30 static void digest_null_init ( void *ctx __unused ) {
  31         /* Do nothing */
  32 }
  33
  34 static void digest_null_update ( void *ctx __unused, const void *src __unused,
  35                                  size_t len __unused ) {
  36         /* Do nothing */
  37 }
  38
  39 static void digest_null_final ( void *ctx __unused, void *out __unused ) {
  40         /* Do nothing */
  41 }
  42
  43 struct digest_algorithm digest_null = {
  44         .name = "null",
  45         .ctxsize = 0,
  46         .blocksize = 1,
  47         .digestsize = 0,
  48         .init = digest_null_init,
  49         .update = digest_null_update,
  50         .final = digest_null_final,
  51 };
  52
  53 static int cipher_null_setkey ( void *ctx __unused, const void *key __unused,
  54                                 size_t keylen __unused ) {
  55         /* Do nothing */
  56         return 0;
  57 }
  58
  59 static void cipher_null_setiv ( void *ctx __unused,
  60                                 const void *iv __unused ) {
  61         /* Do nothing */
  62 }
  63
  64 static void cipher_null_encrypt ( void *ctx __unused, const void *src,
  65                                   void *dst, size_t len ) {
  66         memcpy ( dst, src, len );
  67 }
  68
  69 static void cipher_null_decrypt ( void *ctx __unused, const void *src,
  70                                   void *dst, size_t len ) {
  71         memcpy ( dst, src, len );
  72 }
  73
  74 struct cipher_algorithm cipher_null = {
  75         .name = "null",
  76         .ctxsize = 0,
  77         .blocksize = 1,
  78         .setkey = cipher_null_setkey,
  79         .setiv = cipher_null_setiv,
  80         .encrypt = cipher_null_encrypt,
  81         .decrypt = cipher_null_decrypt,
  82 };
  83
  84 struct pubkey_algorithm pubkey_null = {
  85         .name = "null",
  86         .ctxsize = 0,
  87 };