bin/openssl/gendh.c

   1 /* $OpenBSD: gendh.c,v 1.10 2018/02/07 05:47:55 jsing Exp $ */
   2 /* Copyright (C) 1995-1998 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 <openssl/opensslconf.h>
  60
  61 /* Until the key-gen callbacks are modified to use newer prototypes, we allow
  62  * deprecated functions for openssl-internal code */
  63 #ifdef OPENSSL_NO_DEPRECATED
  64 #undef OPENSSL_NO_DEPRECATED
  65 #endif
  66
  67 #ifndef OPENSSL_NO_DH
  68
  69 #include <sys/types.h>
  70 #include <sys/stat.h>
  71
  72 #include <limits.h>
  73 #include <stdio.h>
  74 #include <string.h>
  75
  76 #include "apps.h"
  77
  78 #include <openssl/bio.h>
  79 #include <openssl/bn.h>
  80 #include <openssl/dh.h>
  81 #include <openssl/err.h>
  82 #include <openssl/pem.h>
  83 #include <openssl/x509.h>
  84
  85 #define DEFBITS 512
  86
  87 static int dh_cb(int p, int n, BN_GENCB * cb);
  88
  89 static struct {
  90         int g;
  91         char *outfile;
  92 } gendh_config;
  93
  94 static struct option gendh_options[] = {
  95         {
  96                 .name = "2",
  97                 .desc = "Generate DH parameters with a generator value of 2 "
  98                     "(default)",
  99                 .type = OPTION_VALUE,
 100                 .value = 2,
 101                 .opt.value = &gendh_config.g,
 102         },
 103         {
 104                 .name = "5",
 105                 .desc = "Generate DH parameters with a generator value of 5",
 106                 .type = OPTION_VALUE,
 107                 .value = 5,
 108                 .opt.value = &gendh_config.g,
 109         },
 110         {
 111                 .name = "out",
 112                 .argname = "file",
 113                 .desc = "Output file (default stdout)",
 114                 .type = OPTION_ARG,
 115                 .opt.arg = &gendh_config.outfile,
 116         },
 117         { NULL },
 118 };
 119
 120 static void
 121 gendh_usage(void)
 122 {
 123         fprintf(stderr,
 124             "usage: gendh [-2 | -5] [-out file] [numbits]\n\n");
 125         options_usage(gendh_options);
 126 }
 127
 128 int
 129 gendh_main(int argc, char **argv)
 130 {
 131         BN_GENCB cb;
 132         DH *dh = NULL;
 133         int ret = 1, numbits = DEFBITS;
 134         BIO *out = NULL;
 135         char *strbits = NULL;
 136
 137         if (single_execution) {
 138                 if (pledge("stdio cpath wpath rpath", NULL) == -1) {
 139                         perror("pledge");
 140                         exit(1);
 141                 }
 142         }
 143
 144         BN_GENCB_set(&cb, dh_cb, bio_err);
 145
 146         memset(&gendh_config, 0, sizeof(gendh_config));
 147
 148         gendh_config.g = 2;
 149
 150         if (options_parse(argc, argv, gendh_options, &strbits, NULL) != 0) {
 151                 gendh_usage();
 152                 goto end;
 153         }
 154
 155         if (strbits != NULL) {
 156                 const char *errstr;
 157                 numbits = strtonum(strbits, 0, INT_MAX, &errstr);
 158                 if (errstr) {
 159                         fprintf(stderr, "Invalid number of bits: %s\n", errstr);
 160                         goto end;
 161                 }
 162         }
 163
 164         out = BIO_new(BIO_s_file());
 165         if (out == NULL) {
 166                 ERR_print_errors(bio_err);
 167                 goto end;
 168         }
 169         if (gendh_config.outfile == NULL) {
 170                 BIO_set_fp(out, stdout, BIO_NOCLOSE);
 171         } else {
 172                 if (BIO_write_filename(out, gendh_config.outfile) <= 0) {
 173                         perror(gendh_config.outfile);
 174                         goto end;
 175                 }
 176         }
 177
 178         BIO_printf(bio_err, "Generating DH parameters, %d bit long safe prime,"
 179             " generator %d\n", numbits, gendh_config.g);
 180         BIO_printf(bio_err, "This is going to take a long time\n");
 181
 182         if (((dh = DH_new()) == NULL) ||
 183             !DH_generate_parameters_ex(dh, numbits, gendh_config.g, &cb))
 184                 goto end;
 185
 186         if (!PEM_write_bio_DHparams(out, dh))
 187                 goto end;
 188         ret = 0;
 189  end:
 190         if (ret != 0)
 191                 ERR_print_errors(bio_err);
 192         BIO_free_all(out);
 193         DH_free(dh);
 194
 195         return (ret);
 196 }
 197
 198 static int
 199 dh_cb(int p, int n, BN_GENCB * cb)
 200 {
 201         char c = '*';
 202
 203         if (p == 0)
 204                 c = '.';
 205         if (p == 1)
 206                 c = '+';
 207         if (p == 2)
 208                 c = '*';
 209         if (p == 3)
 210                 c = '\n';
 211         BIO_write(cb->arg, &c, 1);
 212         (void) BIO_flush(cb->arg);
 213         return 1;
 214 }
 215 #endif