1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
// SPDX-License-Identifier: GPL-2.0-only
// SPDX-FileCopyrightText: © 2015 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
#include <common.h>
#include <command.h>
#include <linux/pagemap.h>
#include <fs.h>
#include <fcntl.h>
#include <errno.h>
#include <xfuncs.h>
#include <malloc.h>
#include <digest.h>
#include <getopt.h>
#include <libfile.h>
#include "internal.h"
int __do_digest(struct digest *d, unsigned char *sig,
int argc, char *argv[])
{
int ret = COMMAND_ERROR_USAGE;
int i;
unsigned char *hash;
if (argc < 1)
goto err;
hash = calloc(digest_length(d), sizeof(unsigned char));
if (!hash) {
perror("calloc");
goto err;
}
while (*argv) {
char *filename = "/dev/mem";
loff_t start = 0, size = MAX_LFS_FILESIZE;
int show_area = 1;
/* arguments are either file, file+area or area */
if (parse_area_spec(*argv, &start, &size)) {
filename = *argv;
show_area = 0;
if (argv[1] && !parse_area_spec(argv[1], &start, &size)) {
argv++;
show_area = 1;
}
}
ret = digest_file_window(d, filename,
hash, sig, start, size);
if (ret < 0) {
ret = 1;
} else {
if (!sig) {
for (i = 0; i < digest_length(d); i++)
printf("%02x", hash[i]);
printf(" %s", filename);
if (show_area)
printf("\t0x%08llx ... 0x%08llx",
start, start + size);
puts("\n");
}
}
argv++;
}
free(hash);
err:
digest_free(d);
return ret;
}
static void __maybe_unused prints_algo_help(void)
{
puts("\navailable algo:\n");
digest_algo_prints("\t");
}
static int do_digest(int argc, char *argv[])
{
struct digest *d;
unsigned char *tmp_key = NULL;
unsigned char *tmp_sig = NULL;
char *sig = NULL;
char *sigfile = NULL;
size_t siglen = 0;
char *key = NULL;
char *keyfile = NULL;
size_t keylen = 0;
size_t digestlen = 0;
char *algo = NULL;
int opt;
int ret = COMMAND_ERROR;
if (argc < 2)
return COMMAND_ERROR_USAGE;
while((opt = getopt(argc, argv, "a:k:K:s:S:")) > 0) {
switch(opt) {
case 'k':
key = optarg;
keylen = strlen(key);
break;
case 'K':
keyfile = optarg;
break;
case 'a':
algo = optarg;
break;
case 's':
sig = optarg;
siglen = strlen(sig);
break;
case 'S':
sigfile = optarg;
break;
}
}
if (!algo)
return COMMAND_ERROR_USAGE;
d = digest_alloc(algo);
if (!d) {
eprintf("algo '%s' not found\n", algo);
return COMMAND_ERROR_USAGE;
}
argc -= optind;
argv += optind;
if (keyfile) {
tmp_key = key = read_file(keyfile, &keylen);
if (!key) {
eprintf("file '%s' not found\n", keyfile);
goto err;
}
}
if (key) {
ret = digest_set_key(d, key, keylen);
free(tmp_key);
if (ret)
goto err;
} else if (digest_is_flags(d, DIGEST_ALGO_NEED_KEY)) {
eprintf("%s need a key to be used\n", digest_name(d));
goto err;
}
if (sigfile) {
sig = tmp_sig = read_file(sigfile, &siglen);
if (!tmp_sig) {
eprintf("file '%s' not found\n", sigfile);
goto err;
}
}
if (sig) {
digestlen = digest_length(d);
if (siglen >= 2 * digestlen) {
if (!tmp_sig)
tmp_sig = xmalloc(digestlen);
ret = hex2bin(tmp_sig, sig, digestlen);
if (ret)
goto err;
sig = tmp_sig;
} else if (siglen != digestlen) {
eprintf("%s wrong size %zu, expected %zu\n",
sigfile, siglen, digestlen);
ret = COMMAND_ERROR;
goto err;
}
}
ret = __do_digest(d, sig, argc, argv);
free(tmp_sig);
return ret;
err:
digest_free(d);
return ret;
}
BAREBOX_CMD_HELP_START(digest)
BAREBOX_CMD_HELP_TEXT("Calculate a digest over a FILE or a memory area.")
BAREBOX_CMD_HELP_TEXT("Options:")
BAREBOX_CMD_HELP_OPT ("-a <algo>\t", "hash or signature algorithm to use")
BAREBOX_CMD_HELP_OPT ("-k <key>\t", "use supplied <key> (ASCII or hex) for MAC")
BAREBOX_CMD_HELP_OPT ("-K <file>\t", "use key from <file> (binary) for MAC")
BAREBOX_CMD_HELP_OPT ("-s <hex>\t", "verify data against supplied <hex> (hash, MAC or signature)")
BAREBOX_CMD_HELP_OPT ("-S <file>\t", "verify data against <file> (hash, MAC or signature)")
BAREBOX_CMD_HELP_END
BAREBOX_CMD_START(digest)
.cmd = do_digest,
BAREBOX_CMD_DESC("calculate digest")
BAREBOX_CMD_OPTS("-a <algo> [-k <key> | -K <file>] [-s <sig> | -S <file>] FILE|AREA")
BAREBOX_CMD_GROUP(CMD_GRP_FILE)
BAREBOX_CMD_HELP(cmd_digest_help)
BAREBOX_CMD_USAGE(prints_algo_help)
BAREBOX_CMD_END
|
