1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
/* Copyright (c) 2017, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#include <map>
#include <vector>
#include <openssl/bio.h>
#include <openssl/evp.h>
#include <openssl/pem.h>
#include "internal.h"
static const struct argument kArguments[] = {
{"-key", kRequiredArgument, "The private key, in PEM format, to sign with"},
{"-digest", kOptionalArgument, "The digest algorithm to use"},
{"", kOptionalArgument, ""},
};
bool Sign(const std::vector<std::string> &args) {
std::map<std::string, std::string> args_map;
if (!ParseKeyValueArguments(&args_map, args, kArguments)) {
PrintUsage(kArguments);
return false;
}
// Load the private key.
bssl::UniquePtr<BIO> bio(BIO_new(BIO_s_file()));
if (!bio || !BIO_read_filename(bio.get(), args_map["-key"].c_str())) {
return false;
}
bssl::UniquePtr<EVP_PKEY> key(
PEM_read_bio_PrivateKey(bio.get(), nullptr, nullptr, nullptr));
if (!key) {
return false;
}
const EVP_MD *md = nullptr;
if (args_map.count("-digest")) {
md = EVP_get_digestbyname(args_map["-digest"].c_str());
if (md == nullptr) {
fprintf(stderr, "Unknown digest algorithm: %s\n",
args_map["-digest"].c_str());
return false;
}
}
bssl::ScopedEVP_MD_CTX ctx;
if (!EVP_DigestSignInit(ctx.get(), nullptr, md, nullptr, key.get())) {
return false;
}
std::vector<uint8_t> data;
if (!ReadAll(&data, stdin)) {
fprintf(stderr, "Error reading input.\n");
return false;
}
size_t sig_len = EVP_PKEY_size(key.get());
auto sig = std::make_unique<uint8_t[]>(sig_len);
if (!EVP_DigestSign(ctx.get(), sig.get(), &sig_len, data.data(),
data.size())) {
return false;
}
if (fwrite(sig.get(), 1, sig_len, stdout) != sig_len) {
fprintf(stderr, "Error writing signature.\n");
return false;
}
return true;
}
|
