dh.c revision 312826 
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/*-
78 * -inform arg  - input format - default PEM (DER or PEM)
79 * -outform arg - output format - default PEM
80 * -in arg      - input file - default stdin
81 * -out arg     - output file - default stdout
82 * -check       - check the parameters are ok
83 * -noout
84 * -text
85 * -C
86 */
87
88int MAIN(int, char **);
89
90int MAIN(int argc, char **argv)
91{
92    DH *dh = NULL;
93    int i, badops = 0, text = 0;
94    BIO *in = NULL, *out = NULL;
95    int informat, outformat, check = 0, noout = 0, C = 0, ret = 1;
96    char *infile, *outfile, *prog;
97    char *engine;
98
99    apps_startup();
100
101    if (bio_err == NULL)
102        if ((bio_err = BIO_new(BIO_s_file())) != NULL)
103            BIO_set_fp(bio_err, stderr, BIO_NOCLOSE | BIO_FP_TEXT);
104
105    if (!load_config(bio_err, NULL))
106        goto end;
107
108    engine = NULL;
109    infile = NULL;
110    outfile = NULL;
111    informat = FORMAT_PEM;
112    outformat = FORMAT_PEM;
113
114    prog = argv[0];
115    argc--;
116    argv++;
117    while (argc >= 1) {
118        if (strcmp(*argv, "-inform") == 0) {
119            if (--argc < 1)
120                goto bad;
121            informat = str2fmt(*(++argv));
122        } else if (strcmp(*argv, "-outform") == 0) {
123            if (--argc < 1)
124                goto bad;
125            outformat = str2fmt(*(++argv));
126        } else if (strcmp(*argv, "-in") == 0) {
127            if (--argc < 1)
128                goto bad;
129            infile = *(++argv);
130        } else if (strcmp(*argv, "-out") == 0) {
131            if (--argc < 1)
132                goto bad;
133            outfile = *(++argv);
134        }
135# ifndef OPENSSL_NO_ENGINE
136        else if (strcmp(*argv, "-engine") == 0) {
137            if (--argc < 1)
138                goto bad;
139            engine = *(++argv);
140        }
141# endif
142        else if (strcmp(*argv, "-check") == 0)
143            check = 1;
144        else if (strcmp(*argv, "-text") == 0)
145            text = 1;
146        else if (strcmp(*argv, "-C") == 0)
147            C = 1;
148        else if (strcmp(*argv, "-noout") == 0)
149            noout = 1;
150        else {
151            BIO_printf(bio_err, "unknown option %s\n", *argv);
152            badops = 1;
153            break;
154        }
155        argc--;
156        argv++;
157    }
158
159    if (badops) {
160 bad:
161        BIO_printf(bio_err, "%s [options] <infile >outfile\n", prog);
162        BIO_printf(bio_err, "where options are\n");
163        BIO_printf(bio_err, " -inform arg   input format - one of DER PEM\n");
164        BIO_printf(bio_err,
165                   " -outform arg  output format - one of DER PEM\n");
166        BIO_printf(bio_err, " -in arg       input file\n");
167        BIO_printf(bio_err, " -out arg      output file\n");
168        BIO_printf(bio_err, " -check        check the DH parameters\n");
169        BIO_printf(bio_err,
170                   " -text         print a text form of the DH parameters\n");
171        BIO_printf(bio_err, " -C            Output C code\n");
172        BIO_printf(bio_err, " -noout        no output\n");
173# ifndef OPENSSL_NO_ENGINE
174        BIO_printf(bio_err,
175                   " -engine e     use engine e, possibly a hardware device.\n");
176# endif
177        goto end;
178    }
179
180    ERR_load_crypto_strings();
181
182    setup_engine(bio_err, engine, 0);
183
184    in = BIO_new(BIO_s_file());
185    out = BIO_new(BIO_s_file());
186    if ((in == NULL) || (out == NULL)) {
187        ERR_print_errors(bio_err);
188        goto end;
189    }
190
191    if (infile == NULL)
192        BIO_set_fp(in, stdin, BIO_NOCLOSE);
193    else {
194        if (BIO_read_filename(in, infile) <= 0) {
195            perror(infile);
196            goto end;
197        }
198    }
199    if (outfile == NULL) {
200        BIO_set_fp(out, stdout, BIO_NOCLOSE);
201# ifdef OPENSSL_SYS_VMS
202        {
203            BIO *tmpbio = BIO_new(BIO_f_linebuffer());
204            out = BIO_push(tmpbio, out);
205        }
206# endif
207    } else {
208        if (BIO_write_filename(out, outfile) <= 0) {
209            perror(outfile);
210            goto end;
211        }
212    }
213
214    if (informat == FORMAT_ASN1)
215        dh = d2i_DHparams_bio(in, NULL);
216    else if (informat == FORMAT_PEM)
217        dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
218    else {
219        BIO_printf(bio_err, "bad input format specified\n");
220        goto end;
221    }
222    if (dh == NULL) {
223        BIO_printf(bio_err, "unable to load DH parameters\n");
224        ERR_print_errors(bio_err);
225        goto end;
226    }
227
228    if (text) {
229        DHparams_print(out, dh);
230# ifdef undef
231        printf("p=");
232        BN_print(stdout, dh->p);
233        printf("\ng=");
234        BN_print(stdout, dh->g);
235        printf("\n");
236        if (dh->length != 0)
237            printf("recommended private length=%ld\n", dh->length);
238# endif
239    }
240
241    if (check) {
242        if (!DH_check(dh, &i)) {
243            ERR_print_errors(bio_err);
244            goto end;
245        }
246        if (i & DH_CHECK_P_NOT_PRIME)
247            printf("p value is not prime\n");
248        if (i & DH_CHECK_P_NOT_SAFE_PRIME)
249            printf("p value is not a safe prime\n");
250        if (i & DH_UNABLE_TO_CHECK_GENERATOR)
251            printf("unable to check the generator value\n");
252        if (i & DH_NOT_SUITABLE_GENERATOR)
253            printf("the g value is not a generator\n");
254        if (i == 0)
255            printf("DH parameters appear to be ok.\n");
256    }
257    if (C) {
258        unsigned char *data;
259        int len, l, bits;
260
261        len = BN_num_bytes(dh->p);
262        bits = BN_num_bits(dh->p);
263        data = (unsigned char *)OPENSSL_malloc(len);
264        if (data == NULL) {
265            perror("OPENSSL_malloc");
266            goto end;
267        }
268        l = BN_bn2bin(dh->p, data);
269        printf("static unsigned char dh%d_p[]={", bits);
270        for (i = 0; i < l; i++) {
271            if ((i % 12) == 0)
272                printf("\n\t");
273            printf("0x%02X,", data[i]);
274        }
275        printf("\n\t};\n");
276
277        l = BN_bn2bin(dh->g, data);
278        printf("static unsigned char dh%d_g[]={", bits);
279        for (i = 0; i < l; i++) {
280            if ((i % 12) == 0)
281                printf("\n\t");
282            printf("0x%02X,", data[i]);
283        }
284        printf("\n\t};\n\n");
285
286        printf("DH *get_dh%d()\n\t{\n", bits);
287        printf("\tDH *dh;\n\n");
288        printf("\tif ((dh=DH_new()) == NULL) return(NULL);\n");
289        printf("\tdh->p=BN_bin2bn(dh%d_p,sizeof(dh%d_p),NULL);\n",
290               bits, bits);
291        printf("\tdh->g=BN_bin2bn(dh%d_g,sizeof(dh%d_g),NULL);\n",
292               bits, bits);
293        printf("\tif ((dh->p == NULL) || (dh->g == NULL))\n");
294        printf("\t\treturn(NULL);\n");
295        printf("\treturn(dh);\n\t}\n");
296        OPENSSL_free(data);
297    }
298
299    if (!noout) {
300        if (outformat == FORMAT_ASN1)
301            i = i2d_DHparams_bio(out, dh);
302        else if (outformat == FORMAT_PEM)
303            i = PEM_write_bio_DHparams(out, dh);
304        else {
305            BIO_printf(bio_err, "bad output format specified for outfile\n");
306            goto end;
307        }
308        if (!i) {
309            BIO_printf(bio_err, "unable to write DH parameters\n");
310            ERR_print_errors(bio_err);
311            goto end;
312        }
313    }
314    ret = 0;
315 end:
316    if (in != NULL)
317        BIO_free(in);
318    if (out != NULL)
319        BIO_free_all(out);
320    if (dh != NULL)
321        DH_free(dh);
322    apps_shutdown();
323    OPENSSL_EXIT(ret);
324}
325#else                           /* !OPENSSL_NO_DH */
326
327# if PEDANTIC
328static void *dummy = &dummy;
329# endif
330
331#endif
332