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      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 
     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