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 /**
  20  * @file
  21  *
  22  * Null crypto algorithm
  23  */
  24
  25 #include <string.h>
  26 #include <gpxe/crypto.h>
  27
  28 static void null_init ( void *ctx __unused ) {
  29         /* Do nothing */
  30 }
  31
  32 static int null_setkey ( void *ctx __unused, const void *key __unused,
  33                          size_t keylen __unused ) {
  34         /* Do nothing */
  35         return 0;
  36 }
  37
  38 static void null_setiv ( void *ctx __unused, const void *iv __unused ) {
  39         /* Do nothing */
  40 }
  41
  42 static void null_encode ( void *ctx __unused, const void *src,
  43                           void *dst, size_t len ) {
  44         if ( dst )
  45                 memcpy ( dst, src, len );
  46 }
  47
  48 static void null_decode ( void *ctx __unused, const void *src,
  49                           void *dst, size_t len ) {
  50         if ( dst )
  51                 memcpy ( dst, src, len );
  52 }
  53
  54 static void null_final ( void *ctx __unused, void *out __unused ) {
  55         /* Do nothing */
  56 }
  57
  58 struct crypto_algorithm crypto_null = {
  59         .name = "null",
  60         .ctxsize = 0,
  61         .blocksize = 1,
  62         .digestsize = 0,
  63         .init = null_init,
  64         .setkey = null_setkey,
  65         .setiv = null_setiv,
  66         .encode = null_encode,
  67         .decode = null_decode,
  68         .final = null_final,
  69 };