/* apps/dh.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>	/* 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>

 #undef PROG

 #define PROG	dh_main

 /* -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

  * -check	- check the parameters are ok

  * -noout

  * -text

  * -C

  */

 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;

 	BIO *in=NULL,*out=NULL;

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

 	char *infile,*outfile,*prog;

 #ifndef OPENSSL_NO_ENGINE

 	char *engine;

 #endif

 	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;

 #ifndef OPENSSL_NO_ENGINE

 	engine=NULL;

 #endif

 	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;

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

 			C=1;

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

 			noout=1;

 		else

 			{

 			BIO_printf(bio_err,"unknown option %s\n",*argv);

 			badops=1;

 			break;

 			}

 		argc--;

 		argv++;

 		}

 	if (badops)

 		{

 bad:

 		BIO_printf(bio_err,"%s [options] <infile >outfile\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");

 		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," -noout        no output\n");

 #ifndef OPENSSL_NO_ENGINE

 		BIO_printf(bio_err," -engine e     use engine e, possibly a hardware device.\n");

 #endif

 		goto end;

 		}

 	ERR_load_crypto_strings();

 #ifndef OPENSSL_NO_ENGINE

         e = setup_engine(bio_err, engine, 0);

 #endif

 	in=BIO_new(BIO_s_file());

 	out=BIO_new(BIO_s_file());

 	if ((in == NULL) || (out == 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 (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	(informat == FORMAT_ASN1)

 		dh=d2i_DHparams_bio(in,NULL);

 	else if (informat == FORMAT_PEM)

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

 	else

 		{

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

 		goto end;

 		}

 	if (dh == NULL)

 		{

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

 		ERR_print_errors(bio_err);

 		goto end;

 		}

 	if (text)

 		{

 		DHparams_print(out,dh);

 #ifdef undef

 		printf("p=");

 		BN_print(stdout,dh->p);

 		printf("\ng=");

 		BN_print(stdout,dh->g);

 		printf("\n");

 		if (dh->length != 0)

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

 #endif

 		}

 	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;

 			}

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

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

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

 			{

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

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

 			}

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

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

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

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

 			{

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

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

 			}

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

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

 		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\treturn(NULL);\n");

 		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);

 	}

 #endif