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1 /* Copyright (c) 2010 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 * Utility for signing boot firmware images. | |
6 */ | |
7 | |
8 #include <stdio.h> | |
9 #include <stdlib.h> | |
10 #include <unistd.h> | |
11 | |
12 #include "file_keys.h" | |
13 #include "utility.h" | |
14 #include "host_key.h" | |
15 #include "host_signature.h" | |
16 #include "host_common.h" | |
17 | |
18 static void usage() | |
19 { | |
20 static char* help_mesg = | |
21 "Usage: sign_image <fw_version> <fw_key_block> <signing_key> " | |
22 "<kernel_public_key> <firmware_file> <output_file>\n"; | |
23 printf("%s", help_mesg); | |
24 } | |
25 | |
26 int SignAndWriteImage(uint64_t fw_version, VbKeyBlockHeader* wrapper_kb, | |
27 VbPrivateKey* signing_key, | |
28 VbPublicKey* nested_pubkey, | |
29 uint8_t* image, uint64_t image_size, | |
30 FILE* out_file) | |
31 { | |
32 VbFirmwarePreambleHeader* fw_preamble = NULL; | |
33 int rv = 1; | |
34 do { /* to be able to bail out anywhere */ | |
35 VbSignature* firmware_sig; | |
36 | |
37 /* sign the firmware first */ | |
38 firmware_sig = CalculateSignature(image, image_size, signing_key); | |
39 | |
40 /* write the original keyblock */ | |
41 if (fwrite(wrapper_kb, wrapper_kb->key_block_size, 1, out_file) != 1) { | |
42 debug("failed writing key block\n"); | |
43 break; | |
44 } | |
45 | |
46 fw_preamble = CreateFirmwarePreamble(fw_version, nested_pubkey, | |
47 firmware_sig, signing_key); | |
48 | |
49 if (!fw_preamble) { | |
50 debug("failed creating preamble\n"); | |
51 break; | |
52 } | |
53 | |
54 /* write the preamble */ | |
55 if (fwrite(fw_preamble, fw_preamble->preamble_size, 1, out_file) != 1) { | |
56 debug("failed writing fw preamble\n"); | |
57 break; | |
58 } | |
59 | |
60 /* write the image */ | |
61 if (fwrite(image, image_size, 1, out_file) != 1) { | |
62 debug("failed writing image\n"); | |
63 break; | |
64 } | |
65 rv = 0; | |
66 } while(0); | |
67 | |
68 if (fw_preamble) { | |
69 Free(fw_preamble); | |
70 } | |
71 | |
72 return rv; | |
73 } | |
74 | |
75 int main(int argc, char* argv[]) { | |
76 VbKeyBlockHeader* firmware_kb; | |
77 VbPublicKey* kernel_pubk; | |
78 uint8_t* firmware; | |
79 uint64_t fw_size; | |
80 uint64_t version; | |
81 VbPrivateKey* signing_key = NULL; | |
82 FILE* out_file; | |
83 int rv; | |
84 | |
85 if (argc != 7) { | |
86 usage(); | |
87 exit(1); | |
88 } | |
89 | |
90 version = strtoul(argv[1], 0, 0); | |
91 firmware_kb = KeyBlockRead(argv[2]); | |
92 kernel_pubk = PublicKeyRead(argv[4]); | |
93 firmware = BufferFromFile(argv[5], &fw_size); | |
94 if (firmware_kb) { | |
95 signing_key = PrivateKeyRead(argv[3], firmware_kb->data_key.algorithm); | |
96 } | |
97 if (!firmware_kb || !kernel_pubk || !firmware || ! signing_key) { | |
98 return 1; | |
99 } | |
100 | |
101 out_file = fopen(argv[6], "wb"); | |
102 if (!out_file) { | |
103 debug("could not open %s for writing\n"); | |
104 return 1; | |
105 } | |
106 | |
107 rv = SignAndWriteImage(version, firmware_kb, signing_key, | |
108 kernel_pubk, firmware, fw_size, out_file); | |
109 | |
110 fclose(out_file); | |
111 if (rv) { | |
112 unlink(argv[6]); | |
113 } | |
114 return rv; | |
115 } | |
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