src/hci/commands/digest_cmd.c

   1 /*
   2  * Copyright (C) 2009 Daniel Verkamp <daniel@drv.nu>.
   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 #include <stdio.h>
  20 #include <string.h>
  21 #include <unistd.h>
  22 #include <gpxe/command.h>
  23 #include <gpxe/image.h>
  24 #include <gpxe/crypto.h>
  25
  26 #include <gpxe/md5.h>
  27 #include <gpxe/sha1.h>
  28
  29 /**
  30  * "digest" command syntax message
  31  *
  32  * @v argv              Argument list
  33  */
  34 static void digest_syntax ( char **argv ) {
  35         printf ( "Usage:\n"
  36                  "  %s <image name>\n"
  37                  "\n"
  38                  "Calculate the %s of an image\n",
  39                  argv[0], argv[0] );
  40 }
  41
  42 /**
  43  * The "digest" command
  44  *
  45  * @v argc              Argument count
  46  * @v argv              Argument list
  47  * @v digest            Digest algorithm
  48  * @ret rc              Exit code
  49  */
  50 static int digest_exec ( int argc, char **argv,
  51                          struct digest_algorithm *digest ) {
  52         const char *image_name;
  53         struct image *image;
  54         uint8_t digest_ctx[digest->ctxsize];
  55         uint8_t digest_out[digest->digestsize];
  56         uint8_t buf[128];
  57         size_t offset;
  58         size_t len;
  59         size_t frag_len;
  60         int i;
  61         unsigned j;
  62
  63         if ( argc < 2 ||
  64              !strcmp ( argv[1], "--help" ) ||
  65              !strcmp ( argv[1], "-h" ) ) {
  66                 digest_syntax ( argv );
  67                 return 1;
  68         }
  69
  70         for ( i = 1 ; i < argc ; i++ ) {
  71                 image_name = argv[i];
  72
  73                 /* find image */
  74                 image = find_image ( image_name );
  75                 if ( ! image ) {
  76                         printf ( "No such image: %s\n", image_name );
  77                         continue;
  78                 }
  79                 offset = 0;
  80                 len = image->len;
  81
  82                 /* calculate digest */
  83                 digest_init ( digest, digest_ctx );
  84                 while ( len ) {
  85                         frag_len = len;
  86                         if ( frag_len > sizeof ( buf ) )
  87                                 frag_len = sizeof ( buf );
  88                         copy_from_user ( buf, image->data, offset, frag_len );
  89                         digest_update ( digest, digest_ctx, buf, frag_len );
  90                         len -= frag_len;
  91                         offset += frag_len;
  92                 }
  93                 digest_final ( digest, digest_ctx, digest_out );
  94
  95                 for ( j = 0 ; j < sizeof ( digest_out ) ; j++ )
  96                         printf ( "%02x", digest_out[j] );
  97
  98                 printf ( "  %s\n", image->name );
  99         }
 100
 101         return 0;
 102 }
 103
 104 static int md5sum_exec ( int argc, char **argv ) {
 105         return digest_exec ( argc, argv, &md5_algorithm );
 106 }
 107
 108 static int sha1sum_exec ( int argc, char **argv ) {
 109         return digest_exec ( argc, argv, &sha1_algorithm );
 110 }
 111
 112 struct command md5sum_command __command = {
 113         .name = "md5sum",
 114         .exec = md5sum_exec,
 115 };
 116
 117 struct command sha1sum_command __command = {
 118         .name = "sha1sum",
 119         .exec = sha1sum_exec,
 120 };