1/* Copyright (c) 2011 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 to generate a padded hash suitable for generating
6 * PKCS#1.5 signatures.
7 */
8
9
10#include <stdio.h>
11#include <stdlib.h>
12
13#include "file_keys.h"
14#include "host_common.h"
15#include "padding.h"
16#include "signature_digest.h"
17
18
19int main(int argc, char* argv[]) {
20  int algorithm = -1;
21  int error_code = 0;
22  uint8_t* digest = NULL;
23  uint8_t* padded_digest = NULL;
24  uint64_t len;
25  uint32_t padded_digest_len;
26
27  if (argc != 3) {
28    fprintf(stderr, "Usage: %s <alg_id> <digest_file>", argv[0]);
29    return -1;
30  }
31  algorithm = atoi(argv[1]);
32  if (algorithm < 0 || algorithm >= kNumAlgorithms) {
33    fprintf(stderr, "Invalid Algorithm!\n");
34    return -1;
35  }
36
37  digest = BufferFromFile(argv[2], &len);
38  if (!digest) {
39    fprintf(stderr, "Could not read file: %s\n", argv[2]);
40    return -1;
41  }
42
43  padded_digest = PrependDigestInfo(algorithm, digest);
44  padded_digest_len = (hash_size_map[algorithm] +
45                       digestinfo_size_map[algorithm]);
46
47  if (!padded_digest)
48    error_code = -1;
49  if(padded_digest &&
50     1 != fwrite(padded_digest, padded_digest_len, 1, stdout))
51    error_code = -1;
52  free(padded_digest);
53  free(digest);
54  return error_code;
55}
56