/* apps/dsaparam.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_DSA */

 /* 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_DSA

 #include <assert.h>

 #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/dsa.h>

 #include <openssl/x509.h>

 #include <openssl/pem.h>

 #undef PROG

 #define PROG	dsaparam_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

  * -noout

  * -text

  * -C

  * -noout

  * -genkey

  *  #ifdef GENCB_TEST

  * -timebomb n  - interrupt keygen after <n> seconds

  *  #endif

  */

 #ifdef GENCB_TEST

 static int stop_keygen_flag = 0;

 static void timebomb_sigalarm(int foo)

 	{

 	stop_keygen_flag = 1;

 	}

 #endif

 static int MS_CALLBACK dsa_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

 	DSA *dsa=NULL;

 	int i,badops=0,text=0;

 	BIO *in=NULL,*out=NULL;

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

 	char *infile,*outfile,*prog,*inrand=NULL;

 	int numbits= -1,num,genkey=0;

 	int need_rand=0;

 #ifndef OPENSSL_NO_ENGINE

 	char *engine=NULL;

 #endif

 #ifdef GENCB_TEST

 	int timebomb=0;

 #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;

 	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

 #ifdef GENCB_TEST

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

 			{

 			if (--argc < 1) goto bad;

 			timebomb = atoi(*(++argv));

 			}

 #endif

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

 			text=1;

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

 			C=1;

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

 			{

 			genkey=1;

 			need_rand=1;

 			}

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

 			{

 			if (--argc < 1) goto bad;

 			inrand= *(++argv);

 			need_rand=1;

 			}

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

 			noout=1;

 		else if (sscanf(*argv,"%d",&num) == 1)

 			{

 			/* generate a key */

 			numbits=num;

 			need_rand=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] [bits] <infile >outfile\n",prog);

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

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

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

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

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

 		BIO_printf(bio_err," -text         print as text\n");

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

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

 		BIO_printf(bio_err," -genkey       generate a DSA key\n");

 		BIO_printf(bio_err," -rand         files to use for random number input\n");

 #ifndef OPENSSL_NO_ENGINE

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

 #endif

 #ifdef GENCB_TEST

 		BIO_printf(bio_err," -timebomb n   interrupt keygen after <n> seconds\n");

 #endif

 		BIO_printf(bio_err," number        number of bits to use for generating private key\n");

 		goto end;

 		}

 	ERR_load_crypto_strings();

 	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;

 			}

 		}

 #ifndef OPENSSL_NO_ENGINE

         e = setup_engine(bio_err, engine, 0);

 #endif

 	if (need_rand)

 		{

 		app_RAND_load_file(NULL, bio_err, (inrand != NULL));

 		if (inrand != NULL)

 			BIO_printf(bio_err,"%ld semi-random bytes loaded\n",

 				app_RAND_load_files(inrand));

 		}

 	if (numbits > 0)

 		{

 		BN_GENCB cb;

 		BN_GENCB_set(&cb, dsa_cb, bio_err);

 		assert(need_rand);

 		dsa = DSA_new();

 		if(!dsa)

 			{

 			BIO_printf(bio_err,"Error allocating DSA object\n");

 			goto end;

 			}

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

 	        BIO_printf(bio_err,"This could take some time\n");

 #ifdef GENCB_TEST

 		if(timebomb > 0)

 	{

 		struct sigaction act;

 		act.sa_handler = timebomb_sigalarm;

 		act.sa_flags = 0;

 		BIO_printf(bio_err,"(though I'll stop it if not done within %d secs)\n",

 				timebomb);

 		if(sigaction(SIGALRM, &act, NULL) != 0)

 			{

 			BIO_printf(bio_err,"Error, couldn't set SIGALRM handler\n");

 			goto end;

 			}

 		alarm(timebomb);

 	}

 #endif

 	        if(!DSA_generate_parameters_ex(dsa,num,NULL,0,NULL,NULL, &cb))

 			{

 #ifdef GENCB_TEST

 			if(stop_keygen_flag)

 				{

 				BIO_printf(bio_err,"DSA key generation time-stopped\n");

 				/* This is an asked-for behaviour! */

 				ret = 0;

 				goto end;

 				}

 #endif

 			BIO_printf(bio_err,"Error, DSA key generation failed\n");

 			goto end;

 			}

 		}

 	else if	(informat == FORMAT_ASN1)

 		dsa=d2i_DSAparams_bio(in,NULL);

 	else if (informat == FORMAT_PEM)

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

 	else

 		{

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

 		goto end;

 		}

 	if (dsa == NULL)

 		{

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

 		ERR_print_errors(bio_err);

 		goto end;

 		}

 	if (text)

 		{

 		DSAparams_print(out,dsa);

 		}

 	if (C)

 		{

 		unsigned char *data;

 		int l,len,bits_p,bits_q,bits_g;

 		len=BN_num_bytes(dsa->p);

 		bits_p=BN_num_bits(dsa->p);

 		bits_q=BN_num_bits(dsa->q);

 		bits_g=BN_num_bits(dsa->g);

 		data=(unsigned char *)OPENSSL_malloc(len+20);

 		if (data == NULL)

 			{

 			perror("OPENSSL_malloc");

 			goto end;

 			}

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

 		printf("static unsigned char dsa%d_p[]={",bits_p);

 		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(dsa->q,data);

 		printf("static unsigned char dsa%d_q[]={",bits_p);

 		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(dsa->g,data);

 		printf("static unsigned char dsa%d_g[]={",bits_p);

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

 			{

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

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

 			}

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

 		printf("DSA *get_dsa%d()\n\t{\n",bits_p);

 		printf("\tDSA *dsa;\n\n");

 		printf("\tif ((dsa=DSA_new()) == NULL) return(NULL);\n");

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

 			bits_p,bits_p);

 		printf("\tdsa->q=BN_bin2bn(dsa%d_q,sizeof(dsa%d_q),NULL);\n",

 			bits_p,bits_p);

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

 			bits_p,bits_p);

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

 		printf("\t\t{ DSA_free(dsa); return(NULL); }\n");

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

 		}

 	if (!noout)

 		{

 		if 	(outformat == FORMAT_ASN1)

 			i=i2d_DSAparams_bio(out,dsa);

 		else if (outformat == FORMAT_PEM)

 			i=PEM_write_bio_DSAparams(out,dsa);

 		else	{

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

 			goto end;

 			}

 		if (!i)

 			{

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

 			ERR_print_errors(bio_err);

 			goto end;

 			}

 		}

 	if (genkey)

 		{

 		DSA *dsakey;

 		assert(need_rand);

 		if ((dsakey=DSAparams_dup(dsa)) == NULL) goto end;

 		if (!DSA_generate_key(dsakey)) goto end;

 		if 	(outformat == FORMAT_ASN1)

 			i=i2d_DSAPrivateKey_bio(out,dsakey);

 		else if (outformat == FORMAT_PEM)

 			i=PEM_write_bio_DSAPrivateKey(out,dsakey,NULL,NULL,0,NULL,NULL);

 		else	{

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

 			goto end;

 			}

 		DSA_free(dsakey);

 		}

 	if (need_rand)

 		app_RAND_write_file(NULL, bio_err);

 	ret=0;

 end:

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

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

 	if (dsa != NULL) DSA_free(dsa);

 	apps_shutdown();

 	OPENSSL_EXIT(ret);

 	}

 static int MS_CALLBACK dsa_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

 #ifdef GENCB_TEST

 	if(stop_keygen_flag)

 		return 0;

 #endif

 	return 1;

 	}

 #endif