dh.c revision 59191 
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#ifndef NO_DH
61#include <stdio.h>
62#include <stdlib.h>
63#include <time.h>
64#include <string.h>
65#include "apps.h"
66#include <openssl/bio.h>
67#include <openssl/err.h>
68#include <openssl/bn.h>
69#include <openssl/dh.h>
70#include <openssl/x509.h>
71#include <openssl/pem.h>
72
73#undef PROG
74#define PROG	dh_main
75
76/* -inform arg	- input format - default PEM (DER or PEM)
77 * -outform arg - output format - default PEM
78 * -in arg	- input file - default stdin
79 * -out arg	- output file - default stdout
80 * -check	- check the parameters are ok
81 * -noout
82 * -text
83 * -C
84 */
85
86int MAIN(int, char **);
87
88int MAIN(int argc, char **argv)
89	{
90	DH *dh=NULL;
91	int i,badops=0,text=0;
92	BIO *in=NULL,*out=NULL;
93	int informat,outformat,check=0,noout=0,C=0,ret=1;
94	char *infile,*outfile,*prog;
95
96	apps_startup();
97
98	if (bio_err == NULL)
99		if ((bio_err=BIO_new(BIO_s_file())) != NULL)
100			BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);
101
102	infile=NULL;
103	outfile=NULL;
104	informat=FORMAT_PEM;
105	outformat=FORMAT_PEM;
106
107	prog=argv[0];
108	argc--;
109	argv++;
110	while (argc >= 1)
111		{
112		if 	(strcmp(*argv,"-inform") == 0)
113			{
114			if (--argc < 1) goto bad;
115			informat=str2fmt(*(++argv));
116			}
117		else if (strcmp(*argv,"-outform") == 0)
118			{
119			if (--argc < 1) goto bad;
120			outformat=str2fmt(*(++argv));
121			}
122		else if (strcmp(*argv,"-in") == 0)
123			{
124			if (--argc < 1) goto bad;
125			infile= *(++argv);
126			}
127		else if (strcmp(*argv,"-out") == 0)
128			{
129			if (--argc < 1) goto bad;
130			outfile= *(++argv);
131			}
132		else if (strcmp(*argv,"-check") == 0)
133			check=1;
134		else if (strcmp(*argv,"-text") == 0)
135			text=1;
136		else if (strcmp(*argv,"-C") == 0)
137			C=1;
138		else if (strcmp(*argv,"-noout") == 0)
139			noout=1;
140		else
141			{
142			BIO_printf(bio_err,"unknown option %s\n",*argv);
143			badops=1;
144			break;
145			}
146		argc--;
147		argv++;
148		}
149
150	if (badops)
151		{
152bad:
153		BIO_printf(bio_err,"%s [options] <infile >outfile\n",prog);
154		BIO_printf(bio_err,"where options are\n");
155		BIO_printf(bio_err," -inform arg   input format - one of DER PEM\n");
156		BIO_printf(bio_err," -outform arg  output format - one of DER PEM\n");
157		BIO_printf(bio_err," -in arg       input file\n");
158		BIO_printf(bio_err," -out arg      output file\n");
159		BIO_printf(bio_err," -check        check the DH parameters\n");
160		BIO_printf(bio_err," -text         print a text form of the DH parameters\n");
161		BIO_printf(bio_err," -C            Output C code\n");
162		BIO_printf(bio_err," -noout        no output\n");
163		goto end;
164		}
165
166	ERR_load_crypto_strings();
167
168	in=BIO_new(BIO_s_file());
169	out=BIO_new(BIO_s_file());
170	if ((in == NULL) || (out == NULL))
171		{
172		ERR_print_errors(bio_err);
173		goto end;
174		}
175
176	if (infile == NULL)
177		BIO_set_fp(in,stdin,BIO_NOCLOSE);
178	else
179		{
180		if (BIO_read_filename(in,infile) <= 0)
181			{
182			perror(infile);
183			goto end;
184			}
185		}
186	if (outfile == NULL)
187		BIO_set_fp(out,stdout,BIO_NOCLOSE);
188	else
189		{
190		if (BIO_write_filename(out,outfile) <= 0)
191			{
192			perror(outfile);
193			goto end;
194			}
195		}
196
197	if	(informat == FORMAT_ASN1)
198		dh=d2i_DHparams_bio(in,NULL);
199	else if (informat == FORMAT_PEM)
200		dh=PEM_read_bio_DHparams(in,NULL,NULL,NULL);
201	else
202		{
203		BIO_printf(bio_err,"bad input format specified\n");
204		goto end;
205		}
206	if (dh == NULL)
207		{
208		BIO_printf(bio_err,"unable to load DH parameters\n");
209		ERR_print_errors(bio_err);
210		goto end;
211		}
212
213
214
215	if (text)
216		{
217		DHparams_print(out,dh);
218#ifdef undef
219		printf("p=");
220		BN_print(stdout,dh->p);
221		printf("\ng=");
222		BN_print(stdout,dh->g);
223		printf("\n");
224		if (dh->length != 0)
225			printf("recommended private length=%ld\n",dh->length);
226#endif
227		}
228
229	if (check)
230		{
231		if (!DH_check(dh,&i))
232			{
233			ERR_print_errors(bio_err);
234			goto end;
235			}
236		if (i & DH_CHECK_P_NOT_PRIME)
237			printf("p value is not prime\n");
238		if (i & DH_CHECK_P_NOT_SAFE_PRIME)
239			printf("p value is not a safe prime\n");
240		if (i & DH_UNABLE_TO_CHECK_GENERATOR)
241			printf("unable to check the generator value\n");
242		if (i & DH_NOT_SUITABLE_GENERATOR)
243			printf("the g value is not a generator\n");
244		if (i == 0)
245			printf("DH parameters appear to be ok.\n");
246		}
247	if (C)
248		{
249		unsigned char *data;
250		int len,l,bits;
251
252		len=BN_num_bytes(dh->p);
253		bits=BN_num_bits(dh->p);
254		data=(unsigned char *)Malloc(len);
255		if (data == NULL)
256			{
257			perror("Malloc");
258			goto end;
259			}
260		l=BN_bn2bin(dh->p,data);
261		printf("static unsigned char dh%d_p[]={",bits);
262		for (i=0; i<l; i++)
263			{
264			if ((i%12) == 0) printf("\n\t");
265			printf("0x%02X,",data[i]);
266			}
267		printf("\n\t};\n");
268
269		l=BN_bn2bin(dh->g,data);
270		printf("static unsigned char dh%d_g[]={",bits);
271		for (i=0; i<l; i++)
272			{
273			if ((i%12) == 0) printf("\n\t");
274			printf("0x%02X,",data[i]);
275			}
276		printf("\n\t};\n\n");
277
278		printf("DH *get_dh%d()\n\t{\n",bits);
279		printf("\tDH *dh;\n\n");
280		printf("\tif ((dh=DH_new()) == NULL) return(NULL);\n");
281		printf("\tdh->p=BN_bin2bn(dh%d_p,sizeof(dh%d_p),NULL);\n",
282			bits,bits);
283		printf("\tdh->g=BN_bin2bn(dh%d_g,sizeof(dh%d_g),NULL);\n",
284			bits,bits);
285		printf("\tif ((dh->p == NULL) || (dh->g == NULL))\n");
286		printf("\t\treturn(NULL);\n");
287		printf("\treturn(dh);\n\t}\n");
288		Free(data);
289		}
290
291
292	if (!noout)
293		{
294		if 	(outformat == FORMAT_ASN1)
295			i=i2d_DHparams_bio(out,dh);
296		else if (outformat == FORMAT_PEM)
297			i=PEM_write_bio_DHparams(out,dh);
298		else	{
299			BIO_printf(bio_err,"bad output format specified for outfile\n");
300			goto end;
301			}
302		if (!i)
303			{
304			BIO_printf(bio_err,"unable to write DH parameters\n");
305			ERR_print_errors(bio_err);
306			goto end;
307			}
308		}
309	ret=0;
310end:
311	if (in != NULL) BIO_free(in);
312	if (out != NULL) BIO_free(out);
313	if (dh != NULL) DH_free(dh);
314	EXIT(ret);
315	}
316#endif
317