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
|
/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Host functions for verified boot.
*/
#include <string.h>
#include "2common.h"
#include "2rsa.h"
#include "2sysincludes.h"
#include "host_common.h"
#include "host_key2.h"
#include "utility.h"
#include "vb2_common.h"
struct vb2_fw_preamble *vb2_create_fw_preamble(
uint32_t firmware_version,
const struct vb2_packed_key *kernel_subkey,
const struct vb2_signature *body_signature,
const struct vb2_private_key *signing_key,
uint32_t flags)
{
uint32_t signed_size = (sizeof(struct vb2_fw_preamble) +
kernel_subkey->key_size +
body_signature->sig_size);
uint32_t block_size = signed_size +
vb2_rsa_sig_size(signing_key->sig_alg);
/* Allocate keyblock */
struct vb2_fw_preamble *h =
(struct vb2_fw_preamble *)calloc(block_size, 1);
if (!h)
return NULL;
uint8_t *kernel_subkey_dest = (uint8_t *)(h + 1);
uint8_t *body_sig_dest = kernel_subkey_dest + kernel_subkey->key_size;
uint8_t *block_sig_dest = body_sig_dest + body_signature->sig_size;
h->header_version_major = VB2_FIRMWARE_PREAMBLE_HEADER_VERSION_MAJOR;
h->header_version_minor = VB2_FIRMWARE_PREAMBLE_HEADER_VERSION_MINOR;
h->preamble_size = block_size;
h->firmware_version = firmware_version;
h->flags = flags;
/* Copy data key */
vb2_init_packed_key(&h->kernel_subkey, kernel_subkey_dest,
kernel_subkey->key_size);
if (VB2_SUCCESS !=
vb2_copy_packed_key(&h->kernel_subkey, kernel_subkey)) {
free(h);
return NULL;
}
/* Copy body signature */
vb2_init_signature(&h->body_signature,
body_sig_dest, body_signature->sig_size, 0);
if (VB2_SUCCESS !=
vb2_copy_signature(&h->body_signature, body_signature)) {
free(h);
return NULL;
}
/* Set up signature struct so we can calculate the signature */
vb2_init_signature(&h->preamble_signature, block_sig_dest,
vb2_rsa_sig_size(signing_key->sig_alg), signed_size);
/* Calculate signature */
struct vb2_signature *sig =
vb2_calculate_signature((uint8_t *)h, signed_size, signing_key);
vb2_copy_signature(&h->preamble_signature, sig);
free(sig);
/* Return the header */
return h;
}
struct vb2_kernel_preamble *vb2_create_kernel_preamble(
uint32_t kernel_version,
uint64_t body_load_address,
uint64_t bootloader_address,
uint32_t bootloader_size,
const struct vb2_signature *body_signature,
uint64_t vmlinuz_header_address,
uint32_t vmlinuz_header_size,
uint32_t flags,
uint32_t desired_size,
const struct vb2_private_key *signing_key)
{
uint64_t signed_size = (sizeof(struct vb2_kernel_preamble) +
body_signature->sig_size);
uint32_t sig_size = vb2_rsa_sig_size(signing_key->sig_alg);
uint32_t block_size = signed_size + sig_size;
/* If the block size is smaller than the desired size, pad it */
if (block_size < desired_size)
block_size = desired_size;
/* Allocate keyblock */
struct vb2_kernel_preamble *h =
(struct vb2_kernel_preamble *)calloc(block_size, 1);
if (!h)
return NULL;
uint8_t *body_sig_dest = (uint8_t *)(h + 1);
uint8_t *block_sig_dest = body_sig_dest + body_signature->sig_size;
h->header_version_major = VB2_KERNEL_PREAMBLE_HEADER_VERSION_MAJOR;
h->header_version_minor = VB2_KERNEL_PREAMBLE_HEADER_VERSION_MINOR;
h->preamble_size = block_size;
h->kernel_version = kernel_version;
h->body_load_address = body_load_address;
h->bootloader_address = bootloader_address;
h->bootloader_size = bootloader_size;
h->vmlinuz_header_address = vmlinuz_header_address;
h->vmlinuz_header_size = vmlinuz_header_size;
h->flags = flags;
/* Copy body signature */
vb2_init_signature(&h->body_signature, body_sig_dest,
body_signature->sig_size, 0);
vb2_copy_signature(&h->body_signature, body_signature);
/* Set up signature struct so we can calculate the signature */
vb2_init_signature(&h->preamble_signature, block_sig_dest,
sig_size, signed_size);
/* Calculate signature */
struct vb2_signature *sigtmp =
vb2_calculate_signature((uint8_t *)h, signed_size, signing_key);
vb2_copy_signature(&h->preamble_signature, sigtmp);
free(sigtmp);
/* Return the header */
return h;
}
|
