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      1 /*
      2  * Copyright (C) 2009 Daniel Verkamp <daniel (at) 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 };
    121