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 /*-
  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
  88 int MAIN(int, char **);
  89
  90 int 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 #else                           /* !OPENSSL_NO_DH */
 332
 333 # if PEDANTIC
 334 static void *dummy = &dummy;
 335 # endif
 336
 337 #endif