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
BufferFromFile(const char * input_file,uint64_t * len)21 uint8_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
RSAPublicKeyFromFile(const char * input_file)52 RSAPublicKey* 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
DigestFile(char * input_file,int sig_algorithm)62 uint8_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