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 functions for file and key handling.
6 */
7
8#include <fcntl.h>
9#include <stdio.h>
10#include <stdlib.h>
11#include <string.h>
12#include <sys/stat.h>
13#include <sys/types.h>
14#include <unistd.h>
15
16#include "cryptolib.h"
17#include "file_keys.h"
18#include "host_common.h"
19#include "signature_digest.h"
20
21uint8_t* BufferFromFile(const char* input_file, uint64_t* len) {
22  int fd;
23  struct stat stat_fd;
24  uint8_t* buf = NULL;
25
26  if ((fd = open(input_file, O_RDONLY)) == -1) {
27    VBDEBUG(("Couldn't open file %s\n", input_file));
28    return NULL;
29  }
30
31  if (-1 == fstat(fd, &stat_fd)) {
32    VBDEBUG(("Couldn't stat file %s\n", input_file));
33    return NULL;
34  }
35  *len = stat_fd.st_size;
36
37  buf = (uint8_t*)malloc(*len);
38  if (!buf) {
39    VbExError("Couldn't allocate %ld bytes for file %s\n", *len, input_file);
40    return NULL;
41  }
42
43  if (*len != read(fd, buf, *len)) {
44    VBDEBUG(("Couldn't read file %s into a buffer\n", input_file));
45    return NULL;
46  }
47
48  close(fd);
49  return buf;
50}
51
52RSAPublicKey* RSAPublicKeyFromFile(const char* input_file) {
53  uint64_t len;
54  RSAPublicKey* key = NULL;
55  uint8_t* buf = BufferFromFile(input_file, &len);
56  if (buf)
57    key = RSAPublicKeyFromBuf(buf, len);
58  free(buf);
59  return key;
60}
61
62uint8_t* DigestFile(char* input_file, int sig_algorithm) {
63  int input_fd, len;
64  uint8_t data[SHA1_BLOCK_SIZE];
65  uint8_t* digest = NULL;
66  DigestContext ctx;
67
68  if( (input_fd = open(input_file, O_RDONLY)) == -1 ) {
69    VBDEBUG(("Couldn't open %s\n", input_file));
70    return NULL;
71  }
72  DigestInit(&ctx, sig_algorithm);
73  while ( (len = read(input_fd, data, SHA1_BLOCK_SIZE)) ==
74          SHA1_BLOCK_SIZE)
75    DigestUpdate(&ctx, data, len);
76  if (len != -1)
77    DigestUpdate(&ctx, data, len);
78  digest = DigestFinal(&ctx);
79  close(input_fd);
80  return digest;
81}
82