blob: 8dcd8c91e59737e51d42f3480dae4bf30a0109f6 [file] [log] [blame]
/* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
* Utility that outputs the message digest of the contents of a file in a
* format that can be used as input to OpenSSL for an RSA signature.
* Needed until the stable OpenSSL release supports SHA-256/512 digests for
* RSA signatures.
* Outputs DigestInfo || Digest where DigestInfo is the OID depending on the
* choice of the hash algorithm (see padding.c).
#include "signature_digest.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "padding.h"
#include "sha.h"
#include "sha_utility.h"
uint8_t* prepend_digestinfo(int algorithm, uint8_t* digest) {
const int digest_size = hash_size_map[algorithm];
const int digestinfo_size = digestinfo_size_map[algorithm];
const uint8_t* digestinfo = hash_digestinfo_map[algorithm];
uint8_t* p = malloc(digestinfo_size + digest_size);
memcpy(p, digestinfo, digestinfo_size);
memcpy(p + digestinfo_size, digest, digest_size);
return p;
int main(int argc, char* argv[]) {
int i, algorithm;
uint8_t* digest = NULL;
uint8_t* signature = NULL;
uint8_t* info_digest = NULL;
if (argc != 3) {
fprintf(stderr, "Usage: %s <algorithm> <input file>\n\n",
fprintf(stderr, "where <algorithm> is the signature algorithm to use:\n");
for(i = 0; i<kNumAlgorithms; i++)
fprintf(stderr, "\t%d for %s\n", i, algo_strings[i]);
return -1;
algorithm = atoi(argv[1]);
if (algorithm >= kNumAlgorithms) {
fprintf(stderr, "Invalid Algorithm!\n");
goto failure;
if (!(digest = DigestFile(argv[2], algorithm)))
goto failure;
info_digest = prepend_digestinfo(algorithm, digest);
write(1, info_digest, hash_size_map[algorithm] +
return 0;