dh.c revision 296465 
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# ifndef OPENSSL_NO_ENGINE
98    char *engine;
99# endif
100
101    apps_startup();
102
103    if (bio_err == NULL)
104        if ((bio_err = BIO_new(BIO_s_file())) != NULL)
105            BIO_set_fp(bio_err, stderr, BIO_NOCLOSE | BIO_FP_TEXT);
106
107    if (!load_config(bio_err, NULL))
108        goto end;
109
110# ifndef OPENSSL_NO_ENGINE
111    engine = NULL;
112# endif
113    infile = NULL;
114    outfile = NULL;
115    informat = FORMAT_PEM;
116    outformat = FORMAT_PEM;
117
118    prog = argv[0];
119    argc--;
120    argv++;
121    while (argc >= 1) {
122        if (strcmp(*argv, "-inform") == 0) {
123            if (--argc < 1)
124                goto bad;
125            informat = str2fmt(*(++argv));
126        } else if (strcmp(*argv, "-outform") == 0) {
127            if (--argc < 1)
128                goto bad;
129            outformat = str2fmt(*(++argv));
130        } else if (strcmp(*argv, "-in") == 0) {
131            if (--argc < 1)
132                goto bad;
133            infile = *(++argv);
134        } else if (strcmp(*argv, "-out") == 0) {
135            if (--argc < 1)
136                goto bad;
137            outfile = *(++argv);
138        }
139# ifndef OPENSSL_NO_ENGINE
140        else if (strcmp(*argv, "-engine") == 0) {
141            if (--argc < 1)
142                goto bad;
143            engine = *(++argv);
144        }
145# endif
146        else if (strcmp(*argv, "-check") == 0)
147            check = 1;
148        else if (strcmp(*argv, "-text") == 0)
149            text = 1;
150        else if (strcmp(*argv, "-C") == 0)
151            C = 1;
152        else if (strcmp(*argv, "-noout") == 0)
153            noout = 1;
154        else {
155            BIO_printf(bio_err, "unknown option %s\n", *argv);
156            badops = 1;
157            break;
158        }
159        argc--;
160        argv++;
161    }
162
163    if (badops) {
164 bad:
165        BIO_printf(bio_err, "%s [options] <infile >outfile\n", prog);
166        BIO_printf(bio_err, "where options are\n");
167        BIO_printf(bio_err, " -inform arg   input format - one of DER PEM\n");
168        BIO_printf(bio_err,
169                   " -outform arg  output format - one of DER PEM\n");
170        BIO_printf(bio_err, " -in arg       input file\n");
171        BIO_printf(bio_err, " -out arg      output file\n");
172        BIO_printf(bio_err, " -check        check the DH parameters\n");
173        BIO_printf(bio_err,
174                   " -text         print a text form of the DH parameters\n");
175        BIO_printf(bio_err, " -C            Output C code\n");
176        BIO_printf(bio_err, " -noout        no output\n");
177# ifndef OPENSSL_NO_ENGINE
178        BIO_printf(bio_err,
179                   " -engine e     use engine e, possibly a hardware device.\n");
180# endif
181        goto end;
182    }
183
184    ERR_load_crypto_strings();
185
186# ifndef OPENSSL_NO_ENGINE
187    setup_engine(bio_err, engine, 0);
188# endif
189
190    in = BIO_new(BIO_s_file());
191    out = BIO_new(BIO_s_file());
192    if ((in == NULL) || (out == NULL)) {
193        ERR_print_errors(bio_err);
194        goto end;
195    }
196
197    if (infile == NULL)
198        BIO_set_fp(in, stdin, BIO_NOCLOSE);
199    else {
200        if (BIO_read_filename(in, infile) <= 0) {
201            perror(infile);
202            goto end;
203        }
204    }
205    if (outfile == NULL) {
206        BIO_set_fp(out, stdout, BIO_NOCLOSE);
207# ifdef OPENSSL_SYS_VMS
208        {
209            BIO *tmpbio = BIO_new(BIO_f_linebuffer());
210            out = BIO_push(tmpbio, out);
211        }
212# endif
213    } else {
214        if (BIO_write_filename(out, outfile) <= 0) {
215            perror(outfile);
216            goto end;
217        }
218    }
219
220    if (informat == FORMAT_ASN1)
221        dh = d2i_DHparams_bio(in, NULL);
222    else if (informat == FORMAT_PEM)
223        dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
224    else {
225        BIO_printf(bio_err, "bad input format specified\n");
226        goto end;
227    }
228    if (dh == NULL) {
229        BIO_printf(bio_err, "unable to load DH parameters\n");
230        ERR_print_errors(bio_err);
231        goto end;
232    }
233
234    if (text) {
235        DHparams_print(out, dh);
236# ifdef undef
237        printf("p=");
238        BN_print(stdout, dh->p);
239        printf("\ng=");
240        BN_print(stdout, dh->g);
241        printf("\n");
242        if (dh->length != 0)
243            printf("recommended private length=%ld\n", dh->length);
244# endif
245    }
246
247    if (check) {
248        if (!DH_check(dh, &i)) {
249            ERR_print_errors(bio_err);
250            goto end;
251        }
252        if (i & DH_CHECK_P_NOT_PRIME)
253            printf("p value is not prime\n");
254        if (i & DH_CHECK_P_NOT_SAFE_PRIME)
255            printf("p value is not a safe prime\n");
256        if (i & DH_UNABLE_TO_CHECK_GENERATOR)
257            printf("unable to check the generator value\n");
258        if (i & DH_NOT_SUITABLE_GENERATOR)
259            printf("the g value is not a generator\n");
260        if (i == 0)
261            printf("DH parameters appear to be ok.\n");
262    }
263    if (C) {
264        unsigned char *data;
265        int len, l, bits;
266
267        len = BN_num_bytes(dh->p);
268        bits = BN_num_bits(dh->p);
269        data = (unsigned char *)OPENSSL_malloc(len);
270        if (data == NULL) {
271            perror("OPENSSL_malloc");
272            goto end;
273        }
274        l = BN_bn2bin(dh->p, data);
275        printf("static unsigned char dh%d_p[]={", bits);
276        for (i = 0; i < l; i++) {
277            if ((i % 12) == 0)
278                printf("\n\t");
279            printf("0x%02X,", data[i]);
280        }
281        printf("\n\t};\n");
282
283        l = BN_bn2bin(dh->g, data);
284        printf("static unsigned char dh%d_g[]={", bits);
285        for (i = 0; i < l; i++) {
286            if ((i % 12) == 0)
287                printf("\n\t");
288            printf("0x%02X,", data[i]);
289        }
290        printf("\n\t};\n\n");
291
292        printf("DH *get_dh%d()\n\t{\n", bits);
293        printf("\tDH *dh;\n\n");
294        printf("\tif ((dh=DH_new()) == NULL) return(NULL);\n");
295        printf("\tdh->p=BN_bin2bn(dh%d_p,sizeof(dh%d_p),NULL);\n",
296               bits, bits);
297        printf("\tdh->g=BN_bin2bn(dh%d_g,sizeof(dh%d_g),NULL);\n",
298               bits, bits);
299        printf("\tif ((dh->p == NULL) || (dh->g == NULL))\n");
300        printf("\t\treturn(NULL);\n");
301        printf("\treturn(dh);\n\t}\n");
302        OPENSSL_free(data);
303    }
304
305    if (!noout) {
306        if (outformat == FORMAT_ASN1)
307            i = i2d_DHparams_bio(out, dh);
308        else if (outformat == FORMAT_PEM)
309            i = PEM_write_bio_DHparams(out, dh);
310        else {
311            BIO_printf(bio_err, "bad output format specified for outfile\n");
312            goto end;
313        }
314        if (!i) {
315            BIO_printf(bio_err, "unable to write DH parameters\n");
316            ERR_print_errors(bio_err);
317            goto end;
318        }
319    }
320    ret = 0;
321 end:
322    if (in != NULL)
323        BIO_free(in);
324    if (out != NULL)
325        BIO_free_all(out);
326    if (dh != NULL)
327        DH_free(dh);
328    apps_shutdown();
329    OPENSSL_EXIT(ret);
330}
331#endif
332