1 /* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
2 * Use of this source code is governed by a BSD-style license that can be
3 * found in the LICENSE file.
4 *
5 * Host functions for keyblocks
6 */
7
8 #include "2sysincludes.h"
9 #include "2common.h"
10 #include "2rsa.h"
11 #include "host_common.h"
12 #include "host_fw_preamble2.h"
13 #include "host_key2.h"
14 #include "host_keyblock2.h"
15 #include "host_misc.h"
16 #include "host_signature2.h"
17 #include "vb2_common.h"
18
vb2_fw_preamble_create(struct vb2_fw_preamble ** fp_ptr,const struct vb2_private_key * signing_key,const struct vb2_signature ** hash_list,uint32_t hash_count,uint32_t fw_version,uint32_t flags,const char * desc)19 int vb2_fw_preamble_create(struct vb2_fw_preamble **fp_ptr,
20 const struct vb2_private_key *signing_key,
21 const struct vb2_signature **hash_list,
22 uint32_t hash_count,
23 uint32_t fw_version,
24 uint32_t flags,
25 const char *desc)
26 {
27 struct vb2_fw_preamble fp = {
28 .c.magic = VB2_MAGIC_FW_PREAMBLE,
29 .c.struct_version_major = VB2_FW_PREAMBLE_VERSION_MAJOR,
30 .c.struct_version_minor = VB2_FW_PREAMBLE_VERSION_MAJOR,
31 .c.fixed_size = sizeof(fp),
32 .c.desc_size = vb2_desc_size(desc),
33 .flags = flags,
34 .fw_version = fw_version,
35 .hash_count = hash_count,
36 };
37
38 uint32_t hash_next;
39 uint32_t sig_size;
40 uint8_t *buf;
41 int i;
42
43 *fp_ptr = NULL;
44
45 /* Determine component sizes */
46 hash_next = fp.hash_offset = fp.c.fixed_size + fp.c.desc_size;
47
48 for (i = 0; i < hash_count; i++)
49 hash_next += hash_list[i]->c.total_size;
50
51 fp.sig_offset = hash_next;
52
53 if (vb2_sig_size_for_key(&sig_size, signing_key, NULL))
54 return VB2_FW_PREAMBLE_CREATE_SIG_SIZE;
55
56 fp.c.total_size = fp.sig_offset + sig_size;
57
58 /* Allocate buffer and copy components */
59 buf = calloc(fp.c.total_size, 1);
60 if (!buf)
61 return VB2_FW_PREAMBLE_CREATE_ALLOC;
62
63 memcpy(buf, &fp, sizeof(fp));
64 if (fp.c.desc_size)
65 strcpy((char *)buf + fp.c.fixed_size, desc);
66
67 hash_next = fp.hash_offset;
68 for (i = 0; i < hash_count; i++) {
69 memcpy(buf + hash_next, hash_list[i],
70 hash_list[i]->c.total_size);
71 hash_next += hash_list[i]->c.total_size;
72 }
73
74 /* Sign the preamble */
75 if (vb2_sign_object(buf, fp.sig_offset, signing_key, NULL)) {
76 free(buf);
77 return VB2_FW_PREAMBLE_CREATE_SIGN;
78 }
79
80 *fp_ptr = (struct vb2_fw_preamble *)buf;
81 return VB2_SUCCESS;
82 }
83