apps/gendh.c

   1 /* apps/gendh.c */
   2 /* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <string.h>
  61 #include <sys/types.h>
  62 #include <sys/stat.h>
  63 #include "apps.h"
  64 #include "bio.h"
  65 #include "rand.h"
  66 #include "err.h"
  67 #include "bn.h"
  68 #include "dh.h"
  69 #include "x509.h"
  70 #include "pem.h"
  71
  72 #define DEFBITS 512
  73 #undef PROG
  74 #define PROG gendh_main
  75
  76 #ifndef NOPROTO
  77 static void MS_CALLBACK dh_cb(int p, int n);
  78 static long dh_load_rand(char *names);
  79 #else
  80 static void MS_CALLBACK dh_cb();
  81 static long dh_load_rand();
  82 #endif
  83
  84 int MAIN(argc, argv)
  85 int argc;
  86 char **argv;
  87         {
  88         char buffer[200];
  89         DH *dh=NULL;
  90         int ret=1,num=DEFBITS;
  91         int g=2;
  92         char *outfile=NULL;
  93         char *inrand=NULL,*randfile;
  94         BIO *out=NULL;
  95
  96         apps_startup();
  97
  98         if (bio_err == NULL)
  99                 if ((bio_err=BIO_new(BIO_s_file())) != NULL)
 100                         BIO_set_fp(bio_err,stderr,BIO_NOCLOSE);
 101
 102         argv++;
 103         argc--;
 104         for (;;)
 105                 {
 106                 if (argc <= 0) break;
 107                 if (strcmp(*argv,"-out") == 0)
 108                         {
 109                         if (--argc < 1) goto bad;
 110                         outfile= *(++argv);
 111                         }
 112                 else if (strcmp(*argv,"-2") == 0)
 113                         g=2;
 114         /*      else if (strcmp(*argv,"-3") == 0)
 115                         g=3; */
 116                 else if (strcmp(*argv,"-5") == 0)
 117                         g=5;
 118                 else if (strcmp(*argv,"-rand") == 0)
 119                         {
 120                         if (--argc < 1) goto bad;
 121                         inrand= *(++argv);
 122                         }
 123                 else
 124                         break;
 125                 argv++;
 126                 argc--;
 127                 }
 128         if ((argc >= 1) && ((sscanf(*argv,"%d",&num) == 0) || (num < 0)))
 129                 {
 130 bad:
 131                 BIO_printf(bio_err,"usage: gendh [args] [numbits]\n");
 132                 BIO_printf(bio_err," -out file - output the key to 'file\n");
 133                 BIO_printf(bio_err," -2    use 2 as the generator value\n");
 134         /*      BIO_printf(bio_err," -3    use 3 as the generator value\n"); */
 135                 BIO_printf(bio_err," -5    use 5 as the generator value\n");
 136                 BIO_printf(bio_err," -rand file:file:...\n");
 137                 BIO_printf(bio_err,"           - load the file (or the files in the directory) into\n");
 138                 BIO_printf(bio_err,"             the random number generator\n");
 139                 goto end;
 140                 }
 141
 142         out=BIO_new(BIO_s_file());
 143         if (out == NULL)
 144                 {
 145                 ERR_print_errors(bio_err);
 146                 goto end;
 147                 }
 148
 149         if (outfile == NULL)
 150                 BIO_set_fp(out,stdout,BIO_NOCLOSE);
 151         else
 152                 {
 153                 if (BIO_write_filename(out,outfile) <= 0)
 154                         {
 155                         perror(outfile);
 156                         goto end;
 157                         }
 158                 }
 159
 160         randfile=RAND_file_name(buffer,200);
 161         if ((randfile == NULL)|| !RAND_load_file(randfile,1024L*1024L))
 162                 BIO_printf(bio_err,"unable to load 'random state'\n");
 163
 164         if (inrand == NULL)
 165                 BIO_printf(bio_err,"warning, not much extra random data, consider using the -rand option\n");
 166         else
 167                 {
 168                 BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
 169                         dh_load_rand(inrand));
 170                 }
 171
 172         BIO_printf(bio_err,"Generating DH parameters, %d bit long strong prime, generator of %d\n",num,g);
 173         BIO_printf(bio_err,"This is going to take a long time\n");
 174         dh=DH_generate_parameters(num,g,dh_cb);
 175
 176         if (dh == NULL) goto end;
 177
 178         if (randfile == NULL)
 179                 BIO_printf(bio_err,"unable to write 'random state'\n");
 180         else
 181                 RAND_write_file(randfile);
 182
 183         if (!PEM_write_bio_DHparams(out,dh))
 184                 goto end;
 185         ret=0;
 186 end:
 187         if (ret != 0)
 188                 ERR_print_errors(bio_err);
 189         if (out != NULL) BIO_free(out);
 190         if (dh != NULL) DH_free(dh);
 191         EXIT(ret);
 192         }
 193
 194 static void MS_CALLBACK dh_cb(p, n)
 195 int p;
 196 int n;
 197         {
 198         char c='*';
 199
 200         if (p == 0) c='.';
 201         if (p == 1) c='+';
 202         if (p == 2) c='*';
 203         if (p == 3) c='\n';
 204         BIO_write(bio_err,&c,1);
 205         BIO_flush(bio_err);
 206 #ifdef LINT
 207         p=n;
 208 #endif
 209         }
 210
 211 static long dh_load_rand(name)
 212 char *name;
 213         {
 214         char *p,*n;
 215         int last;
 216         long tot=0;
 217
 218         for (;;)
 219                 {
 220                 last=0;
 221                 for (p=name; ((*p != '\0') && (*p != LIST_SEPARATOR_CHAR)); p++);
 222                 if (*p == '\0') last=1;
 223                 *p='\0';
 224                 n=name;
 225                 name=p+1;
 226                 if (*n == '\0') break;
 227
 228                 tot+=RAND_load_file(n,1);
 229                 if (last) break;
 230                 }
 231         return(tot);
 232         }
 233
 234