File: [local] / src / usr.bin / openssl / gendh.c (download)
Revision 1.10, Wed Feb 7 05:47:55 2018 UTC (6 years, 4 months ago) by jsing
Branch: MAIN
CVS Tags: OPENBSD_6_5_BASE, OPENBSD_6_5, OPENBSD_6_4_BASE, OPENBSD_6_4, OPENBSD_6_3_BASE, OPENBSD_6_3 Changes since 1.9: +2 -2 lines
Indent labels with a single space so that diff prototypes are more useful.
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/* $OpenBSD: gendh.c,v 1.10 2018/02/07 05:47:55 jsing Exp $ */
/* 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 <sys/types.h>
#include <sys/stat.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include "apps.h"
#include <openssl/bio.h>
#include <openssl/bn.h>
#include <openssl/dh.h>
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/x509.h>
#define DEFBITS 512
static int dh_cb(int p, int n, BN_GENCB * cb);
static struct {
int g;
char *outfile;
} gendh_config;
static struct option gendh_options[] = {
{
.name = "2",
.desc = "Generate DH parameters with a generator value of 2 "
"(default)",
.type = OPTION_VALUE,
.value = 2,
.opt.value = &gendh_config.g,
},
{
.name = "5",
.desc = "Generate DH parameters with a generator value of 5",
.type = OPTION_VALUE,
.value = 5,
.opt.value = &gendh_config.g,
},
{
.name = "out",
.argname = "file",
.desc = "Output file (default stdout)",
.type = OPTION_ARG,
.opt.arg = &gendh_config.outfile,
},
{ NULL },
};
static void
gendh_usage(void)
{
fprintf(stderr,
"usage: gendh [-2 | -5] [-out file] [numbits]\n\n");
options_usage(gendh_options);
}
int
gendh_main(int argc, char **argv)
{
BN_GENCB cb;
DH *dh = NULL;
int ret = 1, numbits = DEFBITS;
BIO *out = NULL;
char *strbits = NULL;
if (single_execution) {
if (pledge("stdio cpath wpath rpath", NULL) == -1) {
perror("pledge");
exit(1);
}
}
BN_GENCB_set(&cb, dh_cb, bio_err);
memset(&gendh_config, 0, sizeof(gendh_config));
gendh_config.g = 2;
if (options_parse(argc, argv, gendh_options, &strbits, NULL) != 0) {
gendh_usage();
goto end;
}
if (strbits != NULL) {
const char *errstr;
numbits = strtonum(strbits, 0, INT_MAX, &errstr);
if (errstr) {
fprintf(stderr, "Invalid number of bits: %s\n", errstr);
goto end;
}
}
out = BIO_new(BIO_s_file());
if (out == NULL) {
ERR_print_errors(bio_err);
goto end;
}
if (gendh_config.outfile == NULL) {
BIO_set_fp(out, stdout, BIO_NOCLOSE);
} else {
if (BIO_write_filename(out, gendh_config.outfile) <= 0) {
perror(gendh_config.outfile);
goto end;
}
}
BIO_printf(bio_err, "Generating DH parameters, %d bit long safe prime,"
" generator %d\n", numbits, gendh_config.g);
BIO_printf(bio_err, "This is going to take a long time\n");
if (((dh = DH_new()) == NULL) ||
!DH_generate_parameters_ex(dh, numbits, gendh_config.g, &cb))
goto end;
if (!PEM_write_bio_DHparams(out, dh))
goto end;
ret = 0;
end:
if (ret != 0)
ERR_print_errors(bio_err);
BIO_free_all(out);
DH_free(dh);
return (ret);
}
static int
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);
return 1;
}
#endif