/* 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;

 #ifndef OPENSSL_NO_ENGINE

 	ENGINE *e = NULL;

 #endif

 	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

         e = 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;

 	}

 #endif