apps/gendsa.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) from
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57
  58 #include <openssl/opensslconf.h> /* for OPENSSL_NO_DSA */
  59 #ifndef OPENSSL_NO_DSA
  60 # include <stdio.h>
  61 # include <string.h>
  62 # include <sys/types.h>
  63 # include <sys/stat.h>
  64 # include "apps.h"
  65 # include <openssl/bio.h>
  66 # include <openssl/err.h>
  67 # include <openssl/bn.h>
  68 # include <openssl/dsa.h>
  69 # include <openssl/x509.h>
  70 # include <openssl/pem.h>
  71
  72 # define DEFBITS 512
  73
  74 typedef enum OPTION_choice {
  75     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  76     OPT_OUT, OPT_PASSOUT, OPT_ENGINE, OPT_RAND, OPT_CIPHER
  77 } OPTION_CHOICE;
  78
  79 OPTIONS gendsa_options[] = {
  80     {OPT_HELP_STR, 1, '-', "Usage: %s [args] dsaparam-file\n"},
  81     {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
  82     {"help", OPT_HELP, '-', "Display this summary"},
  83     {"out", OPT_OUT, '>', "Output the key to the specified file"},
  84     {"passout", OPT_PASSOUT, 's'},
  85     {"rand", OPT_RAND, 's',
  86      "Load the file(s) into the random number generator"},
  87 # ifndef OPENSSL_NO_ENGINE
  88     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  89 # endif
  90     {"", OPT_CIPHER, '-', "Encrypt the output with any supported cipher"},
  91     {NULL}
  92 };
  93
  94 int gendsa_main(int argc, char **argv)
  95 {
  96     BIO *out = NULL, *in = NULL;
  97     DSA *dsa = NULL;
  98     const EVP_CIPHER *enc = NULL;
  99     char *inrand = NULL, *dsaparams = NULL;
 100     char *outfile = NULL, *passoutarg = NULL, *passout = NULL, *prog;
 101     OPTION_CHOICE o;
 102     int ret = 1;
 103
 104     prog = opt_init(argc, argv, gendsa_options);
 105     while ((o = opt_next()) != OPT_EOF) {
 106         switch (o) {
 107         case OPT_EOF:
 108         case OPT_ERR:
 109  opthelp:
 110             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 111             goto end;
 112         case OPT_HELP:
 113             ret = 0;
 114             opt_help(gendsa_options);
 115             goto end;
 116         case OPT_OUT:
 117             outfile = opt_arg();
 118             break;
 119         case OPT_PASSOUT:
 120             passoutarg = opt_arg();
 121             break;
 122         case OPT_ENGINE:
 123             (void)setup_engine(opt_arg(), 0);
 124             break;
 125         case OPT_RAND:
 126             inrand = opt_arg();
 127             break;
 128         case OPT_CIPHER:
 129             if (!opt_cipher(opt_unknown(), &enc))
 130                 goto end;
 131             break;
 132         }
 133     }
 134     argc = opt_num_rest();
 135     argv = opt_rest();
 136
 137     if (argc != 1)
 138         goto opthelp;
 139     dsaparams = *argv;
 140
 141     if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
 142         BIO_printf(bio_err, "Error getting password\n");
 143         goto end;
 144     }
 145
 146     in = bio_open_default(dsaparams, "r");
 147     if (in == NULL)
 148         goto end2;
 149
 150     if ((dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL)) == NULL) {
 151         BIO_printf(bio_err, "unable to load DSA parameter file\n");
 152         goto end;
 153     }
 154     BIO_free(in);
 155     in = NULL;
 156
 157     out = bio_open_default(outfile, "w");
 158     if (out == NULL)
 159         goto end2;
 160
 161     if (!app_RAND_load_file(NULL, 1) && inrand == NULL) {
 162         BIO_printf(bio_err,
 163                    "warning, not much extra random data, consider using the -rand option\n");
 164     }
 165     if (inrand != NULL)
 166         BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
 167                    app_RAND_load_files(inrand));
 168
 169     BIO_printf(bio_err, "Generating DSA key, %d bits\n", BN_num_bits(dsa->p));
 170     if (!DSA_generate_key(dsa))
 171         goto end;
 172
 173     app_RAND_write_file(NULL);
 174
 175     if (!PEM_write_bio_DSAPrivateKey(out, dsa, enc, NULL, 0, NULL, passout))
 176         goto end;
 177     ret = 0;
 178  end:
 179     if (ret != 0)
 180         ERR_print_errors(bio_err);
 181  end2:
 182     BIO_free(in);
 183     BIO_free_all(out);
 184     DSA_free(dsa);
 185     OPENSSL_free(passout);
 186     return (ret);
 187 }
 188 #else                           /* !OPENSSL_NO_DSA */
 189
 190 # if PEDANTIC
 191 static void *dummy = &dummy;
 192 # endif
 193
 194 #endif