apps/gendsa.c

   1 /*
   2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <openssl/opensslconf.h>
  11 #ifdef OPENSSL_NO_DSA
  12 NON_EMPTY_TRANSLATION_UNIT
  13 #else
  14
  15 # include <stdio.h>
  16 # include <string.h>
  17 # include <sys/types.h>
  18 # include <sys/stat.h>
  19 # include "apps.h"
  20 # include <openssl/bio.h>
  21 # include <openssl/err.h>
  22 # include <openssl/bn.h>
  23 # include <openssl/dsa.h>
  24 # include <openssl/x509.h>
  25 # include <openssl/pem.h>
  26
  27 typedef enum OPTION_choice {
  28     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  29     OPT_OUT, OPT_PASSOUT, OPT_ENGINE, OPT_RAND, OPT_CIPHER
  30 } OPTION_CHOICE;
  31
  32 OPTIONS gendsa_options[] = {
  33     {OPT_HELP_STR, 1, '-', "Usage: %s [args] dsaparam-file\n"},
  34     {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
  35     {"help", OPT_HELP, '-', "Display this summary"},
  36     {"out", OPT_OUT, '>', "Output the key to the specified file"},
  37     {"passout", OPT_PASSOUT, 's'},
  38     {"rand", OPT_RAND, 's',
  39      "Load the file(s) into the random number generator"},
  40     {"", OPT_CIPHER, '-', "Encrypt the output with any supported cipher"},
  41 # ifndef OPENSSL_NO_ENGINE
  42     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  43 # endif
  44     {NULL}
  45 };
  46
  47 int gendsa_main(int argc, char **argv)
  48 {
  49     BIO *out = NULL, *in = NULL;
  50     DSA *dsa = NULL;
  51     const EVP_CIPHER *enc = NULL;
  52     char *inrand = NULL, *dsaparams = NULL;
  53     char *outfile = NULL, *passoutarg = NULL, *passout = NULL, *prog;
  54     OPTION_CHOICE o;
  55     int ret = 1, private = 0;
  56     BIGNUM *p = NULL;
  57
  58     prog = opt_init(argc, argv, gendsa_options);
  59     while ((o = opt_next()) != OPT_EOF) {
  60         switch (o) {
  61         case OPT_EOF:
  62         case OPT_ERR:
  63  opthelp:
  64             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  65             goto end;
  66         case OPT_HELP:
  67             ret = 0;
  68             opt_help(gendsa_options);
  69             goto end;
  70         case OPT_OUT:
  71             outfile = opt_arg();
  72             break;
  73         case OPT_PASSOUT:
  74             passoutarg = opt_arg();
  75             break;
  76         case OPT_ENGINE:
  77             (void)setup_engine(opt_arg(), 0);
  78             break;
  79         case OPT_RAND:
  80             inrand = opt_arg();
  81             break;
  82         case OPT_CIPHER:
  83             if (!opt_cipher(opt_unknown(), &enc))
  84                 goto end;
  85             break;
  86         }
  87     }
  88     argc = opt_num_rest();
  89     argv = opt_rest();
  90     private = 1;
  91
  92     if (argc != 1)
  93         goto opthelp;
  94     dsaparams = *argv;
  95
  96     if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
  97         BIO_printf(bio_err, "Error getting password\n");
  98         goto end;
  99     }
 100
 101     in = bio_open_default(dsaparams, 'r', FORMAT_PEM);
 102     if (in == NULL)
 103         goto end2;
 104
 105     if ((dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL)) == NULL) {
 106         BIO_printf(bio_err, "unable to load DSA parameter file\n");
 107         goto end;
 108     }
 109     BIO_free(in);
 110     in = NULL;
 111
 112     out = bio_open_owner(outfile, FORMAT_PEM, private);
 113     if (out == NULL)
 114         goto end2;
 115
 116     if (!app_RAND_load_file(NULL, 1) && inrand == NULL) {
 117         BIO_printf(bio_err,
 118                    "warning, not much extra random data, consider using the -rand option\n");
 119     }
 120     if (inrand != NULL)
 121         BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
 122                    app_RAND_load_files(inrand));
 123
 124     DSA_get0_pqg(dsa, &p, NULL, NULL);
 125     BIO_printf(bio_err, "Generating DSA key, %d bits\n", BN_num_bits(p));
 126     if (!DSA_generate_key(dsa))
 127         goto end;
 128
 129     app_RAND_write_file(NULL);
 130
 131     assert(private);
 132     if (!PEM_write_bio_DSAPrivateKey(out, dsa, enc, NULL, 0, NULL, passout))
 133         goto end;
 134     ret = 0;
 135  end:
 136     if (ret != 0)
 137         ERR_print_errors(bio_err);
 138  end2:
 139     BIO_free(in);
 140     BIO_free_all(out);
 141     DSA_free(dsa);
 142     OPENSSL_free(passout);
 143     return (ret);
 144 }
 145 #endif