/* apps/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.]

  */

 /* ====================================================================

  * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.

  *

  * 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 above 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 acknowledgment:

  *    "This product includes software developed by the OpenSSL Project

  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"

  *

  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

  *    endorse or promote products derived from this software without

  *    prior written permission. For written permission, please contact

  *    openssl-core@openssl.org.

  *

  * 5. Products derived from this software may not be called "OpenSSL"

  *    nor may "OpenSSL" appear in their names without prior written

  *    permission of the OpenSSL Project.

  *

  * 6. Redistributions of any form whatsoever must retain the following

  *    acknowledgment:

  *    "This product includes software developed by the OpenSSL Project

  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"

  *

  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

  * EXPRESSED 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 OpenSSL PROJECT OR

  * ITS 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.

  * ====================================================================

  *

  * This product includes cryptographic software written by Eric Young

  * (eay@cryptsoft.com).  This product includes software written by Tim

  * Hudson (tjh@cryptsoft.com).

  *

  */

 #include <openssl/opensslconf.h>	/* for OPENSSL_NO_DH */

 #ifndef OPENSSL_NO_DH

 #include <stdio.h>

 #include <stdlib.h>

 #include <time.h>

 #include <string.h>

 #include "apps.h"

 #include <openssl/bio.h>

 #include <openssl/err.h>

 #include <openssl/bn.h>

 #include <openssl/dh.h>

 #include <openssl/x509.h>

 #include <openssl/pem.h>

 #ifndef OPENSSL_NO_DSA

 #include <openssl/dsa.h>

 #endif

 #undef PROG

 #define PROG	dhparam_main

 #define DEFBITS	512

 /* -inform arg	- input format - default PEM (DER or PEM)

  * -outform arg - output format - default PEM

  * -in arg	- input file - default stdin

  * -out arg	- output file - default stdout

  * -dsaparam  - read or generate DSA parameters, convert to DH

  * -check	- check the parameters are ok

  * -noout

  * -text

  * -C

  */

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

 int MAIN(int, char **);

 int MAIN(int argc, char **argv)

 	{

 #ifndef OPENSSL_NO_ENGINE

 	ENGINE *e = NULL;

 #endif

 	DH *dh=NULL;

 	int i,badops=0,text=0;

 #ifndef OPENSSL_NO_DSA

 	int dsaparam=0;

 #endif

 	BIO *in=NULL,*out=NULL;

 	int informat,outformat,check=0,noout=0,C=0,ret=1;

 	char *infile,*outfile,*prog;

 	char *inrand=NULL;

 #ifndef OPENSSL_NO_ENGINE

 	char *engine=NULL;

 #endif

 	int num = 0, g = 0;

 	apps_startup();

 	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;

 	infile=NULL;

 	outfile=NULL;

 	informat=FORMAT_PEM;

 	outformat=FORMAT_PEM;

 	prog=argv[0];

 	argc--;

 	argv++;

 	while (argc >= 1)

 		{

 		if 	(strcmp(*argv,"-inform") == 0)

 			{

 			if (--argc < 1) goto bad;

 			informat=str2fmt(*(++argv));

 			}

 		else if (strcmp(*argv,"-outform") == 0)

 			{

 			if (--argc < 1) goto bad;

 			outformat=str2fmt(*(++argv));

 			}

 		else if (strcmp(*argv,"-in") == 0)

 			{

 			if (--argc < 1) goto bad;

 			infile= *(++argv);

 			}

 		else if (strcmp(*argv,"-out") == 0)

 			{

 			if (--argc < 1) goto bad;

 			outfile= *(++argv);

 			}

 #ifndef OPENSSL_NO_ENGINE

 		else if (strcmp(*argv,"-engine") == 0)

 			{

 			if (--argc < 1) goto bad;

 			engine= *(++argv);

 			}

 #endif

 		else if (strcmp(*argv,"-check") == 0)

 			check=1;

 		else if (strcmp(*argv,"-text") == 0)

 			text=1;

 #ifndef OPENSSL_NO_DSA

 		else if (strcmp(*argv,"-dsaparam") == 0)

 			dsaparam=1;

 #endif

 		else if (strcmp(*argv,"-C") == 0)

 			C=1;

 		else if (strcmp(*argv,"-noout") == 0)

 			noout=1;

 		else if (strcmp(*argv,"-2") == 0)

 			g=2;

 		else if (strcmp(*argv,"-5") == 0)

 			g=5;

 		else if (strcmp(*argv,"-rand") == 0)

 			{

 			if (--argc < 1) goto bad;

 			inrand= *(++argv);

 			}

 		else if (((sscanf(*argv,"%d",&num) == 0) || (num <= 0)))

 			goto bad;

 		argv++;

 		argc--;

 		}

 	if (badops)

 		{

 bad:

 		BIO_printf(bio_err,"%s [options] [numbits]\n",prog);

 		BIO_printf(bio_err,"where options are\n");

 		BIO_printf(bio_err," -inform arg   input format - one of DER PEM\n");

 		BIO_printf(bio_err," -outform arg  output format - one of DER PEM\n");

 		BIO_printf(bio_err," -in arg       input file\n");

 		BIO_printf(bio_err," -out arg      output file\n");

 #ifndef OPENSSL_NO_DSA

 		BIO_printf(bio_err," -dsaparam     read or generate DSA parameters, convert to DH\n");

 #endif

 		BIO_printf(bio_err," -check        check the DH parameters\n");

 		BIO_printf(bio_err," -text         print a text form of the DH parameters\n");

 		BIO_printf(bio_err," -C            Output C code\n");

 		BIO_printf(bio_err," -2            generate parameters using  2 as the generator value\n");

 		BIO_printf(bio_err," -5            generate parameters using  5 as the generator value\n");

 		BIO_printf(bio_err," numbits       number of bits in to generate (default 512)\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");

 		BIO_printf(bio_err," -noout        no output\n");

 		goto end;

 		}

 	ERR_load_crypto_strings();

 #ifndef OPENSSL_NO_ENGINE

         e = setup_engine(bio_err, engine, 0);

 #endif

 	if (g && !num)

 		num = DEFBITS;

 #ifndef OPENSSL_NO_DSA

 	if (dsaparam)

 		{

 		if (g)

 			{

 			BIO_printf(bio_err, "generator may not be chosen for DSA parameters\n");

 			goto end;

 			}

 		}

 	else

 #endif

 		{

 		/* DH parameters */

 		if (num && !g)

 			g = 2;

 		}

 	if(num) {

 		BN_GENCB cb;

 		BN_GENCB_set(&cb, dh_cb, bio_err);

 		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));

 #ifndef OPENSSL_NO_DSA

 		if (dsaparam)

 			{

 			DSA *dsa = DSA_new();

 			BIO_printf(bio_err,"Generating DSA parameters, %d bit long prime\n",num);

 			if(!dsa || !DSA_generate_parameters_ex(dsa, num,

 						NULL, 0, NULL, NULL, &cb))

 				{

 				if(dsa) DSA_free(dsa);

 				ERR_print_errors(bio_err);

 				goto end;

 				}

 			dh = DSA_dup_DH(dsa);

 			DSA_free(dsa);

 			if (dh == NULL)

 				{

 				ERR_print_errors(bio_err);

 				goto end;

 				}

 			}

 		else

 #endif

 			{

 			dh = DH_new();

 			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_generate_parameters_ex(dh, num, g, &cb))

 				{

 				if(dh) DH_free(dh);

 				ERR_print_errors(bio_err);

 				goto end;

 				}

 			}

 		app_RAND_write_file(NULL, bio_err);

 	} else {

 		in=BIO_new(BIO_s_file());

 		if (in == NULL)

 			{

 			ERR_print_errors(bio_err);

 			goto end;

 			}

 		if (infile == NULL)

 			BIO_set_fp(in,stdin,BIO_NOCLOSE);

 		else

 			{

 			if (BIO_read_filename(in,infile) <= 0)

 				{

 				perror(infile);

 				goto end;

 				}

 			}

 		if	(informat != FORMAT_ASN1 && informat != FORMAT_PEM)

 			{

 			BIO_printf(bio_err,"bad input format specified\n");

 			goto end;

 			}

 #ifndef OPENSSL_NO_DSA

 		if (dsaparam)

 			{

 			DSA *dsa;

 			if (informat == FORMAT_ASN1)

 				dsa=d2i_DSAparams_bio(in,NULL);

 			else /* informat == FORMAT_PEM */

 				dsa=PEM_read_bio_DSAparams(in,NULL,NULL,NULL);

 			if (dsa == NULL)

 				{

 				BIO_printf(bio_err,"unable to load DSA parameters\n");

 				ERR_print_errors(bio_err);

 				goto end;

 				}

 			dh = DSA_dup_DH(dsa);

 			DSA_free(dsa);

 			if (dh == NULL)

 				{

 				ERR_print_errors(bio_err);

 				goto end;

 				}

 			}

 		else

 #endif

 			{

 			if (informat == FORMAT_ASN1)

 				dh=d2i_DHparams_bio(in,NULL);

 			else /* informat == FORMAT_PEM */

 				dh=PEM_read_bio_DHparams(in,NULL,NULL,NULL);

 			if (dh == NULL)

 				{

 				BIO_printf(bio_err,"unable to load DH parameters\n");

 				ERR_print_errors(bio_err);

 				goto end;

 				}

 			}

 		/* dh != NULL */

 	}

 	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 (text)

 		{

 		DHparams_print(out,dh);

 		}

 	if (check)

 		{

 		if (!DH_check(dh,&i))

 			{

 			ERR_print_errors(bio_err);

 			goto end;

 			}

 		if (i & DH_CHECK_P_NOT_PRIME)

 			printf("p value is not prime\n");

 		if (i & DH_CHECK_P_NOT_SAFE_PRIME)

 			printf("p value is not a safe prime\n");

 		if (i & DH_UNABLE_TO_CHECK_GENERATOR)

 			printf("unable to check the generator value\n");

 		if (i & DH_NOT_SUITABLE_GENERATOR)

 			printf("the g value is not a generator\n");

 		if (i == 0)

 			printf("DH parameters appear to be ok.\n");

 		}

 	if (C)

 		{

 		unsigned char *data;

 		int len,l,bits;

 		len=BN_num_bytes(dh->p);

 		bits=BN_num_bits(dh->p);

 		data=(unsigned char *)OPENSSL_malloc(len);

 		if (data == NULL)

 			{

 			perror("OPENSSL_malloc");

 			goto end;

 			}

 		printf("#ifndef HEADER_DH_H\n"

 		       "#include <openssl/dh.h>\n"

 		       "#endif\n");

 		printf("DH *get_dh%d()\n\t{\n",bits);

 		l=BN_bn2bin(dh->p,data);

 		printf("\tstatic unsigned char dh%d_p[]={",bits);

 		for (i=0; i<l; i++)

 			{

 			if ((i%12) == 0) printf("\n\t\t");

 			printf("0x%02X,",data[i]);

 			}

 		printf("\n\t\t};\n");

 		l=BN_bn2bin(dh->g,data);

 		printf("\tstatic unsigned char dh%d_g[]={",bits);

 		for (i=0; i<l; i++)

 			{

 			if ((i%12) == 0) printf("\n\t\t");

 			printf("0x%02X,",data[i]);

 			}

 		printf("\n\t\t};\n");

 		printf("\tDH *dh;\n\n");

 		printf("\tif ((dh=DH_new()) == NULL) return(NULL);\n");

 		printf("\tdh->p=BN_bin2bn(dh%d_p,sizeof(dh%d_p),NULL);\n",

 			bits,bits);

 		printf("\tdh->g=BN_bin2bn(dh%d_g,sizeof(dh%d_g),NULL);\n",

 			bits,bits);

 		printf("\tif ((dh->p == NULL) || (dh->g == NULL))\n");

 		printf("\t\t{ DH_free(dh); return(NULL); }\n");

 		if (dh->length)

 			printf("\tdh->length = %ld;\n", dh->length);

 		printf("\treturn(dh);\n\t}\n");

 		OPENSSL_free(data);

 		}

 	if (!noout)

 		{

 		if 	(outformat == FORMAT_ASN1)

 			i=i2d_DHparams_bio(out,dh);

 		else if (outformat == FORMAT_PEM)

 			i=PEM_write_bio_DHparams(out,dh);

 		else	{

 			BIO_printf(bio_err,"bad output format specified for outfile\n");

 			goto end;

 			}

 		if (!i)

 			{

 			BIO_printf(bio_err,"unable to write DH parameters\n");

 			ERR_print_errors(bio_err);

 			goto end;

 			}

 		}

 	ret=0;

 end:

 	if (in != NULL) BIO_free(in);

 	if (out != NULL) BIO_free_all(out);

 	if (dh != NULL) DH_free(dh);

 	apps_shutdown();

 	OPENSSL_EXIT(ret);

 	}

 /* dh_cb is identical to dsa_cb in apps/dsaparam.c */

 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