1/* apps/dh.c */
2/* obsoleted by dhparam.c */
3/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
4 * All rights reserved.
5 *
6 * This package is an SSL implementation written
7 * by Eric Young (eay@cryptsoft.com).
8 * The implementation was written so as to conform with Netscapes SSL.
9 *
10 * This library is free for commercial and non-commercial use as long as
11 * the following conditions are aheared to.  The following conditions
12 * apply to all code found in this distribution, be it the RC4, RSA,
13 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
14 * included with this distribution is covered by the same copyright terms
15 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 *
17 * Copyright remains Eric Young's, and as such any Copyright notices in
18 * the code are not to be removed.
19 * If this package is used in a product, Eric Young should be given attribution
20 * as the author of the parts of the library used.
21 * This can be in the form of a textual message at program startup or
22 * in documentation (online or textual) provided with the package.
23 *
24 * Redistribution and use in source and binary forms, with or without
25 * modification, are permitted provided that the following conditions
26 * are met:
27 * 1. Redistributions of source code must retain the copyright
28 *    notice, this list of conditions and the following disclaimer.
29 * 2. Redistributions in binary form must reproduce the above copyright
30 *    notice, this list of conditions and the following disclaimer in the
31 *    documentation and/or other materials provided with the distribution.
32 * 3. All advertising materials mentioning features or use of this software
33 *    must display the following acknowledgement:
34 *    "This product includes cryptographic software written by
35 *     Eric Young (eay@cryptsoft.com)"
36 *    The word 'cryptographic' can be left out if the rouines from the library
37 *    being used are not cryptographic related :-).
38 * 4. If you include any Windows specific code (or a derivative thereof) from
39 *    the apps directory (application code) you must include an acknowledgement:
40 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 *
42 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
43 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
44 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
45 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
46 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
47 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
48 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
49 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
50 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
51 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * SUCH DAMAGE.
53 *
54 * The licence and distribution terms for any publically available version or
55 * derivative of this code cannot be changed.  i.e. this code cannot simply be
56 * copied and put under another distribution licence
57 * [including the GNU Public Licence.]
58 */
59
60#include <openssl/opensslconf.h>	/* for OPENSSL_NO_DH */
61#ifndef OPENSSL_NO_DH
62#include <stdio.h>
63#include <stdlib.h>
64#include <time.h>
65#include <string.h>
66#include "apps.h"
67#include <openssl/bio.h>
68#include <openssl/err.h>
69#include <openssl/bn.h>
70#include <openssl/dh.h>
71#include <openssl/x509.h>
72#include <openssl/pem.h>
73
74#undef PROG
75#define PROG	dh_main
76
77/* -inform arg	- input format - default PEM (DER or PEM)
78 * -outform arg - output format - default PEM
79 * -in arg	- input file - default stdin
80 * -out arg	- output file - default stdout
81 * -check	- check the parameters are ok
82 * -noout
83 * -text
84 * -C
85 */
86
87int MAIN(int, char **);
88
89int MAIN(int argc, char **argv)
90	{
91#ifndef OPENSSL_NO_ENGINE
92	ENGINE *e = NULL;
93#endif
94	DH *dh=NULL;
95	int i,badops=0,text=0;
96	BIO *in=NULL,*out=NULL;
97	int informat,outformat,check=0,noout=0,C=0,ret=1;
98	char *infile,*outfile,*prog;
99#ifndef OPENSSL_NO_ENGINE
100	char *engine;
101#endif
102
103	apps_startup();
104
105	if (bio_err == NULL)
106		if ((bio_err=BIO_new(BIO_s_file())) != NULL)
107			BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);
108
109	if (!load_config(bio_err, NULL))
110		goto end;
111
112#ifndef OPENSSL_NO_ENGINE
113	engine=NULL;
114#endif
115	infile=NULL;
116	outfile=NULL;
117	informat=FORMAT_PEM;
118	outformat=FORMAT_PEM;
119
120	prog=argv[0];
121	argc--;
122	argv++;
123	while (argc >= 1)
124		{
125		if 	(strcmp(*argv,"-inform") == 0)
126			{
127			if (--argc < 1) goto bad;
128			informat=str2fmt(*(++argv));
129			}
130		else if (strcmp(*argv,"-outform") == 0)
131			{
132			if (--argc < 1) goto bad;
133			outformat=str2fmt(*(++argv));
134			}
135		else if (strcmp(*argv,"-in") == 0)
136			{
137			if (--argc < 1) goto bad;
138			infile= *(++argv);
139			}
140		else if (strcmp(*argv,"-out") == 0)
141			{
142			if (--argc < 1) goto bad;
143			outfile= *(++argv);
144			}
145#ifndef OPENSSL_NO_ENGINE
146		else if (strcmp(*argv,"-engine") == 0)
147			{
148			if (--argc < 1) goto bad;
149			engine= *(++argv);
150			}
151#endif
152		else if (strcmp(*argv,"-check") == 0)
153			check=1;
154		else if (strcmp(*argv,"-text") == 0)
155			text=1;
156		else if (strcmp(*argv,"-C") == 0)
157			C=1;
158		else if (strcmp(*argv,"-noout") == 0)
159			noout=1;
160		else
161			{
162			BIO_printf(bio_err,"unknown option %s\n",*argv);
163			badops=1;
164			break;
165			}
166		argc--;
167		argv++;
168		}
169
170	if (badops)
171		{
172bad:
173		BIO_printf(bio_err,"%s [options] <infile >outfile\n",prog);
174		BIO_printf(bio_err,"where options are\n");
175		BIO_printf(bio_err," -inform arg   input format - one of DER PEM\n");
176		BIO_printf(bio_err," -outform arg  output format - one of DER PEM\n");
177		BIO_printf(bio_err," -in arg       input file\n");
178		BIO_printf(bio_err," -out arg      output file\n");
179		BIO_printf(bio_err," -check        check the DH parameters\n");
180		BIO_printf(bio_err," -text         print a text form of the DH parameters\n");
181		BIO_printf(bio_err," -C            Output C code\n");
182		BIO_printf(bio_err," -noout        no output\n");
183#ifndef OPENSSL_NO_ENGINE
184		BIO_printf(bio_err," -engine e     use engine e, possibly a hardware device.\n");
185#endif
186		goto end;
187		}
188
189	ERR_load_crypto_strings();
190
191#ifndef OPENSSL_NO_ENGINE
192        e = setup_engine(bio_err, engine, 0);
193#endif
194
195	in=BIO_new(BIO_s_file());
196	out=BIO_new(BIO_s_file());
197	if ((in == NULL) || (out == NULL))
198		{
199		ERR_print_errors(bio_err);
200		goto end;
201		}
202
203	if (infile == NULL)
204		BIO_set_fp(in,stdin,BIO_NOCLOSE);
205	else
206		{
207		if (BIO_read_filename(in,infile) <= 0)
208			{
209			perror(infile);
210			goto end;
211			}
212		}
213	if (outfile == NULL)
214		{
215		BIO_set_fp(out,stdout,BIO_NOCLOSE);
216#ifdef OPENSSL_SYS_VMS
217		{
218		BIO *tmpbio = BIO_new(BIO_f_linebuffer());
219		out = BIO_push(tmpbio, out);
220		}
221#endif
222		}
223	else
224		{
225		if (BIO_write_filename(out,outfile) <= 0)
226			{
227			perror(outfile);
228			goto end;
229			}
230		}
231
232	if	(informat == FORMAT_ASN1)
233		dh=d2i_DHparams_bio(in,NULL);
234	else if (informat == FORMAT_PEM)
235		dh=PEM_read_bio_DHparams(in,NULL,NULL,NULL);
236	else
237		{
238		BIO_printf(bio_err,"bad input format specified\n");
239		goto end;
240		}
241	if (dh == NULL)
242		{
243		BIO_printf(bio_err,"unable to load DH parameters\n");
244		ERR_print_errors(bio_err);
245		goto end;
246		}
247
248
249
250	if (text)
251		{
252		DHparams_print(out,dh);
253#ifdef undef
254		printf("p=");
255		BN_print(stdout,dh->p);
256		printf("\ng=");
257		BN_print(stdout,dh->g);
258		printf("\n");
259		if (dh->length != 0)
260			printf("recommended private length=%ld\n",dh->length);
261#endif
262		}
263
264	if (check)
265		{
266		if (!DH_check(dh,&i))
267			{
268			ERR_print_errors(bio_err);
269			goto end;
270			}
271		if (i & DH_CHECK_P_NOT_PRIME)
272			printf("p value is not prime\n");
273		if (i & DH_CHECK_P_NOT_SAFE_PRIME)
274			printf("p value is not a safe prime\n");
275		if (i & DH_UNABLE_TO_CHECK_GENERATOR)
276			printf("unable to check the generator value\n");
277		if (i & DH_NOT_SUITABLE_GENERATOR)
278			printf("the g value is not a generator\n");
279		if (i == 0)
280			printf("DH parameters appear to be ok.\n");
281		}
282	if (C)
283		{
284		unsigned char *data;
285		int len,l,bits;
286
287		len=BN_num_bytes(dh->p);
288		bits=BN_num_bits(dh->p);
289		data=(unsigned char *)OPENSSL_malloc(len);
290		if (data == NULL)
291			{
292			perror("OPENSSL_malloc");
293			goto end;
294			}
295		l=BN_bn2bin(dh->p,data);
296		printf("static unsigned char dh%d_p[]={",bits);
297		for (i=0; i<l; i++)
298			{
299			if ((i%12) == 0) printf("\n\t");
300			printf("0x%02X,",data[i]);
301			}
302		printf("\n\t};\n");
303
304		l=BN_bn2bin(dh->g,data);
305		printf("static unsigned char dh%d_g[]={",bits);
306		for (i=0; i<l; i++)
307			{
308			if ((i%12) == 0) printf("\n\t");
309			printf("0x%02X,",data[i]);
310			}
311		printf("\n\t};\n\n");
312
313		printf("DH *get_dh%d()\n\t{\n",bits);
314		printf("\tDH *dh;\n\n");
315		printf("\tif ((dh=DH_new()) == NULL) return(NULL);\n");
316		printf("\tdh->p=BN_bin2bn(dh%d_p,sizeof(dh%d_p),NULL);\n",
317			bits,bits);
318		printf("\tdh->g=BN_bin2bn(dh%d_g,sizeof(dh%d_g),NULL);\n",
319			bits,bits);
320		printf("\tif ((dh->p == NULL) || (dh->g == NULL))\n");
321		printf("\t\treturn(NULL);\n");
322		printf("\treturn(dh);\n\t}\n");
323		OPENSSL_free(data);
324		}
325
326
327	if (!noout)
328		{
329		if 	(outformat == FORMAT_ASN1)
330			i=i2d_DHparams_bio(out,dh);
331		else if (outformat == FORMAT_PEM)
332			i=PEM_write_bio_DHparams(out,dh);
333		else	{
334			BIO_printf(bio_err,"bad output format specified for outfile\n");
335			goto end;
336			}
337		if (!i)
338			{
339			BIO_printf(bio_err,"unable to write DH parameters\n");
340			ERR_print_errors(bio_err);
341			goto end;
342			}
343		}
344	ret=0;
345end:
346	if (in != NULL) BIO_free(in);
347	if (out != NULL) BIO_free_all(out);
348	if (dh != NULL) DH_free(dh);
349	apps_shutdown();
350	OPENSSL_EXIT(ret);
351	}
352#endif
353