summaryrefslogtreecommitdiff
path: root/tools/image-host.c
blob: d944d0ff4e3cc1f2363b9e5fce2653ee986e0607 (plain)
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
208
/*
 * Copyright (c) 2013, Google Inc.
 *
 * (C) Copyright 2008 Semihalf
 *
 * (C) Copyright 2000-2006
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include "mkimage.h"
#include <bootstage.h>
#include <image.h>
#include <sha1.h>
#include <time.h>
#include <u-boot/crc.h>
#include <u-boot/md5.h>

/**
 * fit_set_hash_value - set hash value in requested has node
 * @fit: pointer to the FIT format image header
 * @noffset: hash node offset
 * @value: hash value to be set
 * @value_len: hash value length
 *
 * fit_set_hash_value() attempts to set hash value in a node at offset
 * given and returns operation status to the caller.
 *
 * returns
 *     0, on success
 *     -1, on failure
 */
static int fit_set_hash_value(void *fit, int noffset, uint8_t *value,
				int value_len)
{
	int ret;

	ret = fdt_setprop(fit, noffset, FIT_VALUE_PROP, value, value_len);
	if (ret) {
		printf("Can't set hash '%s' property for '%s' node(%s)\n",
		       FIT_VALUE_PROP, fit_get_name(fit, noffset, NULL),
		       fdt_strerror(ret));
		return -1;
	}

	return 0;
}

/**
 * fit_image_process_hash - Process a single subnode of the images/ node
 *
 * Check each subnode and process accordingly. For hash nodes we generate
 * a hash of the supplised data and store it in the node.
 *
 * @fit:	pointer to the FIT format image header
 * @image_name:	name of image being processes (used to display errors)
 * @noffset:	subnode offset
 * @data:	data to process
 * @size:	size of data in bytes
 * @return 0 if ok, -1 on error
 */
static int fit_image_process_hash(void *fit, const char *image_name,
		int noffset, const void *data, size_t size)
{
	uint8_t value[FIT_MAX_HASH_LEN];
	const char *node_name;
	int value_len;
	char *algo;

	node_name = fit_get_name(fit, noffset, NULL);

	if (fit_image_hash_get_algo(fit, noffset, &algo)) {
		printf("Can't get hash algo property for '%s' hash node in '%s' image node\n",
		       node_name, image_name);
		return -1;
	}

	if (calculate_hash(data, size, algo, value, &value_len)) {
		printf("Unsupported hash algorithm (%s) for '%s' hash node in '%s' image node\n",
		       algo, node_name, image_name);
		return -1;
	}

	if (fit_set_hash_value(fit, noffset, value, value_len)) {
		printf("Can't set hash value for '%s' hash node in '%s' image node\n",
		       node_name, image_name);
		return -1;
	}

	return 0;
}

/**
 * fit_image_add_verification_data() - calculate/set hash data for image node
 *
 * This adds hash values for a component image node.
 *
 * All existing hash subnodes are checked, if algorithm property is set to
 * one of the supported hash algorithms, hash value is computed and
 * corresponding hash node property is set, for example:
 *
 * Input component image node structure:
 *
 * o image@1 (at image_noffset)
 *   | - data = [binary data]
 *   o hash@1
 *     |- algo = "sha1"
 *
 * Output component image node structure:
 *
 * o image@1 (at image_noffset)
 *   | - data = [binary data]
 *   o hash@1
 *     |- algo = "sha1"
 *     |- value = sha1(data)
 *
 * For signature details, please see doc/uImage.FIT/signature.txt
 *
 * @fit:	Pointer to the FIT format image header
 * @image_noffset: Requested component image node
 * @return: 0 on success, <0 on failure
 */
int fit_image_add_verification_data(void *fit, int image_noffset)
{
	const char *image_name;
	const void *data;
	size_t size;
	int noffset;

	/* Get image data and data length */
	if (fit_image_get_data(fit, image_noffset, &data, &size)) {
		printf("Can't get image data/size\n");
		return -1;
	}

	image_name = fit_get_name(fit, image_noffset, NULL);

	/* Process all hash subnodes of the component image node */
	for (noffset = fdt_first_subnode(fit, image_noffset);
	     noffset >= 0;
	     noffset = fdt_next_subnode(fit, noffset)) {
		const char *node_name;
		int ret = 0;

		/*
		 * Check subnode name, must be equal to "hash" or "signature".
		 * Multiple hash nodes require unique unit node
		 * names, e.g. hash@1, hash@2, signature@1, etc.
		 */
		node_name = fit_get_name(fit, noffset, NULL);
		if (!strncmp(node_name, FIT_HASH_NODENAME,
			     strlen(FIT_HASH_NODENAME))) {
			ret = fit_image_process_hash(fit, image_name, noffset,
						data, size);
		}
		if (ret)
			return -1;
	}

	return 0;
}

int fit_add_verification_data(void *fit)
{
	int images_noffset;
	int noffset;
	int ret;

	/* Find images parent node offset */
	images_noffset = fdt_path_offset(fit, FIT_IMAGES_PATH);
	if (images_noffset < 0) {
		printf("Can't find images parent node '%s' (%s)\n",
		       FIT_IMAGES_PATH, fdt_strerror(images_noffset));
		return images_noffset;
	}

	/* Process its subnodes, print out component images details */
	for (noffset = fdt_first_subnode(fit, images_noffset);
	     noffset >= 0;
	     noffset = fdt_next_subnode(fit, noffset)) {
		/*
		 * Direct child node of the images parent node,
		 * i.e. component image node.
		 */
		ret = fit_image_add_verification_data(fit, noffset);
		if (ret)
			return ret;
	}

	return 0;
}