Add -show_chain option to print out verified chain.
[openssl.git] / apps / dh.c
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
87 int MAIN(int, char **);
88
89 int MAIN(int argc, char **argv)
90         {
91         DH *dh=NULL;
92         int i,badops=0,text=0;
93         BIO *in=NULL,*out=NULL;
94         int informat,outformat,check=0,noout=0,C=0,ret=1;
95         char *infile,*outfile,*prog;
96 #ifndef OPENSSL_NO_ENGINE
97         char *engine;
98 #endif
99
100         apps_startup();
101
102         if (bio_err == NULL)
103                 if ((bio_err=BIO_new(BIO_s_file())) != NULL)
104                         BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);
105
106         if (!load_config(bio_err, NULL))
107                 goto end;
108
109 #ifndef OPENSSL_NO_ENGINE
110         engine=NULL;
111 #endif
112         infile=NULL;
113         outfile=NULL;
114         informat=FORMAT_PEM;
115         outformat=FORMAT_PEM;
116
117         prog=argv[0];
118         argc--;
119         argv++;
120         while (argc >= 1)
121                 {
122                 if      (strcmp(*argv,"-inform") == 0)
123                         {
124                         if (--argc < 1) goto bad;
125                         informat=str2fmt(*(++argv));
126                         }
127                 else if (strcmp(*argv,"-outform") == 0)
128                         {
129                         if (--argc < 1) goto bad;
130                         outformat=str2fmt(*(++argv));
131                         }
132                 else if (strcmp(*argv,"-in") == 0)
133                         {
134                         if (--argc < 1) goto bad;
135                         infile= *(++argv);
136                         }
137                 else if (strcmp(*argv,"-out") == 0)
138                         {
139                         if (--argc < 1) goto bad;
140                         outfile= *(++argv);
141                         }
142 #ifndef OPENSSL_NO_ENGINE
143                 else if (strcmp(*argv,"-engine") == 0)
144                         {
145                         if (--argc < 1) goto bad;
146                         engine= *(++argv);
147                         }
148 #endif
149                 else if (strcmp(*argv,"-check") == 0)
150                         check=1;
151                 else if (strcmp(*argv,"-text") == 0)
152                         text=1;
153                 else if (strcmp(*argv,"-C") == 0)
154                         C=1;
155                 else if (strcmp(*argv,"-noout") == 0)
156                         noout=1;
157                 else
158                         {
159                         BIO_printf(bio_err,"unknown option %s\n",*argv);
160                         badops=1;
161                         break;
162                         }
163                 argc--;
164                 argv++;
165                 }
166
167         if (badops)
168                 {
169 bad:
170                 BIO_printf(bio_err,"%s [options] <infile >outfile\n",prog);
171                 BIO_printf(bio_err,"where options are\n");
172                 BIO_printf(bio_err," -inform arg   input format - one of DER PEM\n");
173                 BIO_printf(bio_err," -outform arg  output format - one of DER PEM\n");
174                 BIO_printf(bio_err," -in arg       input file\n");
175                 BIO_printf(bio_err," -out arg      output file\n");
176                 BIO_printf(bio_err," -check        check the DH parameters\n");
177                 BIO_printf(bio_err," -text         print a text form of the DH parameters\n");
178                 BIO_printf(bio_err," -C            Output C code\n");
179                 BIO_printf(bio_err," -noout        no output\n");
180 #ifndef OPENSSL_NO_ENGINE
181                 BIO_printf(bio_err," -engine e     use engine e, possibly a hardware device.\n");
182 #endif
183                 goto end;
184                 }
185
186         ERR_load_crypto_strings();
187
188 #ifndef OPENSSL_NO_ENGINE
189         setup_engine(bio_err, engine, 0);
190 #endif
191
192         in=BIO_new(BIO_s_file());
193         out=BIO_new(BIO_s_file());
194         if ((in == NULL) || (out == NULL))
195                 {
196                 ERR_print_errors(bio_err);
197                 goto end;
198                 }
199
200         if (infile == NULL)
201                 BIO_set_fp(in,stdin,BIO_NOCLOSE);
202         else
203                 {
204                 if (BIO_read_filename(in,infile) <= 0)
205                         {
206                         perror(infile);
207                         goto end;
208                         }
209                 }
210         if (outfile == NULL)
211                 {
212                 BIO_set_fp(out,stdout,BIO_NOCLOSE);
213 #ifdef OPENSSL_SYS_VMS
214                 {
215                 BIO *tmpbio = BIO_new(BIO_f_linebuffer());
216                 out = BIO_push(tmpbio, out);
217                 }
218 #endif
219                 }
220         else
221                 {
222                 if (BIO_write_filename(out,outfile) <= 0)
223                         {
224                         perror(outfile);
225                         goto end;
226                         }
227                 }
228
229         if      (informat == FORMAT_ASN1)
230                 dh=d2i_DHparams_bio(in,NULL);
231         else if (informat == FORMAT_PEM)
232                 dh=PEM_read_bio_DHparams(in,NULL,NULL,NULL);
233         else
234                 {
235                 BIO_printf(bio_err,"bad input format specified\n");
236                 goto end;
237                 }
238         if (dh == NULL)
239                 {
240                 BIO_printf(bio_err,"unable to load DH parameters\n");
241                 ERR_print_errors(bio_err);
242                 goto end;
243                 }
244
245         
246
247         if (text)
248                 {
249                 DHparams_print(out,dh);
250 #ifdef undef
251                 printf("p=");
252                 BN_print(stdout,dh->p);
253                 printf("\ng=");
254                 BN_print(stdout,dh->g);
255                 printf("\n");
256                 if (dh->length != 0)
257                         printf("recommended private length=%ld\n",dh->length);
258 #endif
259                 }
260         
261         if (check)
262                 {
263                 if (!DH_check(dh,&i))
264                         {
265                         ERR_print_errors(bio_err);
266                         goto end;
267                         }
268                 if (i & DH_CHECK_P_NOT_PRIME)
269                         printf("p value is not prime\n");
270                 if (i & DH_CHECK_P_NOT_SAFE_PRIME)
271                         printf("p value is not a safe prime\n");
272                 if (i & DH_UNABLE_TO_CHECK_GENERATOR)
273                         printf("unable to check the generator value\n");
274                 if (i & DH_NOT_SUITABLE_GENERATOR)
275                         printf("the g value is not a generator\n");
276                 if (i == 0)
277                         printf("DH parameters appear to be ok.\n");
278                 }
279         if (C)
280                 {
281                 unsigned char *data;
282                 int len,l,bits;
283
284                 len=BN_num_bytes(dh->p);
285                 bits=BN_num_bits(dh->p);
286                 data=(unsigned char *)OPENSSL_malloc(len);
287                 if (data == NULL)
288                         {
289                         perror("OPENSSL_malloc");
290                         goto end;
291                         }
292                 l=BN_bn2bin(dh->p,data);
293                 printf("static unsigned char dh%d_p[]={",bits);
294                 for (i=0; i<l; i++)
295                         {
296                         if ((i%12) == 0) printf("\n\t");
297                         printf("0x%02X,",data[i]);
298                         }
299                 printf("\n\t};\n");
300
301                 l=BN_bn2bin(dh->g,data);
302                 printf("static unsigned char dh%d_g[]={",bits);
303                 for (i=0; i<l; i++)
304                         {
305                         if ((i%12) == 0) printf("\n\t");
306                         printf("0x%02X,",data[i]);
307                         }
308                 printf("\n\t};\n\n");
309
310                 printf("DH *get_dh%d()\n\t{\n",bits);
311                 printf("\tDH *dh;\n\n");
312                 printf("\tif ((dh=DH_new()) == NULL) return(NULL);\n");
313                 printf("\tdh->p=BN_bin2bn(dh%d_p,sizeof(dh%d_p),NULL);\n",
314                         bits,bits);
315                 printf("\tdh->g=BN_bin2bn(dh%d_g,sizeof(dh%d_g),NULL);\n",
316                         bits,bits);
317                 printf("\tif ((dh->p == NULL) || (dh->g == NULL))\n");
318                 printf("\t\treturn(NULL);\n");
319                 printf("\treturn(dh);\n\t}\n");
320                 OPENSSL_free(data);
321                 }
322
323
324         if (!noout)
325                 {
326                 if      (outformat == FORMAT_ASN1)
327                         i=i2d_DHparams_bio(out,dh);
328                 else if (outformat == FORMAT_PEM)
329                         i=PEM_write_bio_DHparams(out,dh);
330                 else    {
331                         BIO_printf(bio_err,"bad output format specified for outfile\n");
332                         goto end;
333                         }
334                 if (!i)
335                         {
336                         BIO_printf(bio_err,"unable to write DH parameters\n");
337                         ERR_print_errors(bio_err);
338                         goto end;
339                         }
340                 }
341         ret=0;
342 end:
343         if (in != NULL) BIO_free(in);
344         if (out != NULL) BIO_free_all(out);
345         if (dh != NULL) DH_free(dh);
346         apps_shutdown();
347         OPENSSL_EXIT(ret);
348         }
349 #else /* !OPENSSL_NO_DH */
350
351 # if PEDANTIC
352 static void *dummy=&dummy;
353 # endif
354
355 #endif