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gendh.c
/* apps/gendh.c */
/* obsoleted by dhparam.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <openssl/opensslconf.h>
/* Until the key-gen callbacks are modified to use newer prototypes, we allow
 * deprecated functions for openssl-internal code */
#ifdef OPENSSL_NO_DEPRECATED
#undef OPENSSL_NO_DEPRECATED
#endif

#ifndef OPENSSL_NO_DH
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "apps.h"
#include <openssl/bio.h>
#include <openssl/rand.h>
#include <openssl/err.h>
#include <openssl/bn.h>
#include <openssl/dh.h>
#include <openssl/x509.h>
#include <openssl/pem.h>

#define DEFBITS   512
#undef PROG
#define PROG gendh_main

static int MS_CALLBACK dh_cb(int p, int n, BN_GENCB *cb);

int MAIN(int, char **);

int MAIN(int argc, char **argv)
      {
      BN_GENCB cb;
      DH *dh=NULL;
      int ret=1,num=DEFBITS;
      int g=2;
      char *outfile=NULL;
      char *inrand=NULL;
#ifndef OPENSSL_NO_ENGINE
      char *engine=NULL;
#endif
      BIO *out=NULL;

      apps_startup();

      BN_GENCB_set(&cb, dh_cb, bio_err);
      if (bio_err == NULL)
            if ((bio_err=BIO_new(BIO_s_file())) != NULL)
                  BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);

      if (!load_config(bio_err, NULL))
            goto end;

      argv++;
      argc--;
      for (;;)
            {
            if (argc <= 0) break;
            if (strcmp(*argv,"-out") == 0)
                  {
                  if (--argc < 1) goto bad;
                  outfile= *(++argv);
                  }
            else if (strcmp(*argv,"-2") == 0)
                  g=2;
      /*    else if (strcmp(*argv,"-3") == 0)
                  g=3; */
            else if (strcmp(*argv,"-5") == 0)
                  g=5;
#ifndef OPENSSL_NO_ENGINE
            else if (strcmp(*argv,"-engine") == 0)
                  {
                  if (--argc < 1) goto bad;
                  engine= *(++argv);
                  }
#endif
            else if (strcmp(*argv,"-rand") == 0)
                  {
                  if (--argc < 1) goto bad;
                  inrand= *(++argv);
                  }
            else
                  break;
            argv++;
            argc--;
            }
      if ((argc >= 1) && ((sscanf(*argv,"%d",&num) == 0) || (num < 0)))
            {
bad:
            BIO_printf(bio_err,"usage: gendh [args] [numbits]\n");
            BIO_printf(bio_err," -out file - output the key to 'file\n");
            BIO_printf(bio_err," -2        - use 2 as the generator value\n");
      /*    BIO_printf(bio_err," -3        - use 3 as the generator value\n"); */
            BIO_printf(bio_err," -5        - use 5 as the generator value\n");
#ifndef OPENSSL_NO_ENGINE
            BIO_printf(bio_err," -engine e - use engine e, possibly a hardware device.\n");
#endif
            BIO_printf(bio_err," -rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
            BIO_printf(bio_err,"           - load the file (or the files in the directory) into\n");
            BIO_printf(bio_err,"             the random number generator\n");
            goto end;
            }
            
#ifndef OPENSSL_NO_ENGINE
        setup_engine(bio_err, engine, 0);
#endif

      out=BIO_new(BIO_s_file());
      if (out == NULL)
            {
            ERR_print_errors(bio_err);
            goto end;
            }

      if (outfile == NULL)
            {
            BIO_set_fp(out,stdout,BIO_NOCLOSE);
#ifdef OPENSSL_SYS_VMS
            {
            BIO *tmpbio = BIO_new(BIO_f_linebuffer());
            out = BIO_push(tmpbio, out);
            }
#endif
            }
      else
            {
            if (BIO_write_filename(out,outfile) <= 0)
                  {
                  perror(outfile);
                  goto end;
                  }
            }

      if (!app_RAND_load_file(NULL, bio_err, 1) && inrand == NULL)
            {
            BIO_printf(bio_err,"warning, not much extra random data, consider using the -rand option\n");
            }
      if (inrand != NULL)
            BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
                  app_RAND_load_files(inrand));

      BIO_printf(bio_err,"Generating DH parameters, %d bit long safe prime, generator %d\n",num,g);
      BIO_printf(bio_err,"This is going to take a long time\n");

      if(((dh = DH_new()) == NULL) || !DH_generate_parameters_ex(dh, num, g, &cb))
            goto end;
            
      app_RAND_write_file(NULL, bio_err);

      if (!PEM_write_bio_DHparams(out,dh))
            goto end;
      ret=0;
end:
      if (ret != 0)
            ERR_print_errors(bio_err);
      if (out != NULL) BIO_free_all(out);
      if (dh != NULL) DH_free(dh);
      apps_shutdown();
      OPENSSL_EXIT(ret);
      }

static int MS_CALLBACK dh_cb(int p, int n, BN_GENCB *cb)
      {
      char c='*';

      if (p == 0) c='.';
      if (p == 1) c='+';
      if (p == 2) c='*';
      if (p == 3) c='\n';
      BIO_write(cb->arg,&c,1);
      (void)BIO_flush(cb->arg);
#ifdef LINT
      p=n;
#endif
      return 1;
      }
#else /* !OPENSSL_NO_DH */

# if PEDANTIC
static void *dummy=&dummy;
# endif

#endif

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