1 /* Copyright (c) 2015, Google Inc.
2 *
3 * Permission to use, copy, modify, and/or distribute this software for any
4 * purpose with or without fee is hereby granted, provided that the above
5 * copyright notice and this permission notice appear in all copies.
6 *
7 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
8 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
10 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
12 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
13 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
14
15 #include <openssl/bio.h>
16 #include <openssl/bn.h>
17 #include <openssl/err.h>
18 #include <openssl/pem.h>
19 #include <openssl/rsa.h>
20
21 #include "internal.h"
22
23
24 static const struct argument kArguments[] = {
25 {
26 "-nprimes", kOptionalArgument,
27 "The number of primes to generate (default: 2)",
28 },
29 {
30 "-bits", kOptionalArgument,
31 "The number of bits in the modulus (default: 2048)",
32 },
33 {
34 "", kOptionalArgument, "",
35 },
36 };
37
GenerateRSAKey(const std::vector<std::string> & args)38 bool GenerateRSAKey(const std::vector<std::string> &args) {
39 std::map<std::string, std::string> args_map;
40
41 if (!ParseKeyValueArguments(&args_map, args, kArguments)) {
42 PrintUsage(kArguments);
43 return false;
44 }
45
46 unsigned bits, nprimes = 0;
47 if (!GetUnsigned(&bits, "-bits", 2048, args_map) ||
48 !GetUnsigned(&nprimes, "-nprimes", 2, args_map)) {
49 PrintUsage(kArguments);
50 return false;
51 }
52
53 bssl::UniquePtr<RSA> rsa(RSA_new());
54 bssl::UniquePtr<BIGNUM> e(BN_new());
55 bssl::UniquePtr<BIO> bio(BIO_new_fp(stdout, BIO_NOCLOSE));
56
57 if (!BN_set_word(e.get(), RSA_F4) ||
58 !RSA_generate_multi_prime_key(rsa.get(), bits, nprimes, e.get(), NULL) ||
59 !PEM_write_bio_RSAPrivateKey(bio.get(), rsa.get(), NULL /* cipher */,
60 NULL /* key */, 0 /* key len */,
61 NULL /* password callback */,
62 NULL /* callback arg */)) {
63 ERR_print_errors_fp(stderr);
64 return false;
65 }
66
67 return true;
68 }
69