bin/openssl/dh.c

   1 /* $OpenBSD: dh.c,v 1.9 2017/01/20 08:57:11 deraadt Exp $ */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <openssl/opensslconf.h>        /* for OPENSSL_NO_DH */
  60
  61 #ifndef OPENSSL_NO_DH
  62
  63 #include <stdio.h>
  64 #include <stdlib.h>
  65 #include <string.h>
  66 #include <time.h>
  67
  68 #include "apps.h"
  69
  70 #include <openssl/bio.h>
  71 #include <openssl/bn.h>
  72 #include <openssl/err.h>
  73 #include <openssl/dh.h>
  74 #include <openssl/pem.h>
  75 #include <openssl/x509.h>
  76
  77 static struct {
  78         int C;
  79         int check;
  80         char *infile;
  81         int informat;
  82         int noout;
  83         char *outfile;
  84         int outformat;
  85         int text;
  86 } dh_config;
  87
  88 static struct option dh_options[] = {
  89         {
  90                 .name = "C",
  91                 .desc = "Convert DH parameters into C code",
  92                 .type = OPTION_FLAG,
  93                 .opt.flag = &dh_config.C,
  94         },
  95         {
  96                 .name = "check",
  97                 .desc = "Check the DH parameters",
  98                 .type = OPTION_FLAG,
  99                 .opt.flag = &dh_config.check,
 100         },
 101         {
 102                 .name = "in",
 103                 .argname = "file",
 104                 .desc = "Input file (default stdin)",
 105                 .type = OPTION_ARG,
 106                 .opt.arg = &dh_config.infile,
 107         },
 108         {
 109                 .name = "inform",
 110                 .argname = "format",
 111                 .desc = "Input format (DER or PEM (default))",
 112                 .type = OPTION_ARG_FORMAT,
 113                 .opt.value = &dh_config.informat,
 114         },
 115         {
 116                 .name = "noout",
 117                 .desc = "No output",
 118                 .type = OPTION_FLAG,
 119                 .opt.flag = &dh_config.noout,
 120         },
 121         {
 122                 .name = "out",
 123                 .argname = "file",
 124                 .desc = "Output file (default stdout)",
 125                 .type = OPTION_ARG,
 126                 .opt.arg = &dh_config.outfile,
 127         },
 128         {
 129                 .name = "outform",
 130                 .argname = "format",
 131                 .desc = "Output format (DER or PEM (default))",
 132                 .type = OPTION_ARG_FORMAT,
 133                 .opt.value = &dh_config.outformat,
 134         },
 135         {
 136                 .name = "text",
 137                 .desc = "Print a text form of the DH parameters",
 138                 .type = OPTION_FLAG,
 139                 .opt.flag = &dh_config.text,
 140         },
 141         { NULL },
 142 };
 143
 144 static void
 145 dh_usage(void)
 146 {
 147         fprintf(stderr,
 148             "usage: dh [-C] [-check] [-in file] [-inform format]\n"
 149             "    [-noout] [-out file] [-outform format] [-text]\n\n");
 150         options_usage(dh_options);
 151 }
 152
 153 int
 154 dh_main(int argc, char **argv)
 155 {
 156         DH *dh = NULL;
 157         int i;
 158         BIO *in = NULL, *out = NULL;
 159         int ret = 1;
 160
 161         if (single_execution) {
 162                 if (pledge("stdio cpath wpath rpath", NULL) == -1) {
 163                         perror("pledge");
 164                         exit(1);
 165                 }
 166         }
 167
 168         memset(&dh_config, 0, sizeof(dh_config));
 169
 170         dh_config.informat = FORMAT_PEM;
 171         dh_config.outformat = FORMAT_PEM;
 172
 173         if (options_parse(argc, argv, dh_options, NULL, NULL) != 0) {
 174                 dh_usage();
 175                 goto end;
 176         }
 177
 178         in = BIO_new(BIO_s_file());
 179         out = BIO_new(BIO_s_file());
 180         if (in == NULL || out == NULL) {
 181                 ERR_print_errors(bio_err);
 182                 goto end;
 183         }
 184         if (dh_config.infile == NULL)
 185                 BIO_set_fp(in, stdin, BIO_NOCLOSE);
 186         else {
 187                 if (BIO_read_filename(in, dh_config.infile) <= 0) {
 188                         perror(dh_config.infile);
 189                         goto end;
 190                 }
 191         }
 192         if (dh_config.outfile == NULL) {
 193                 BIO_set_fp(out, stdout, BIO_NOCLOSE);
 194         } else {
 195                 if (BIO_write_filename(out, dh_config.outfile) <= 0) {
 196                         perror(dh_config.outfile);
 197                         goto end;
 198                 }
 199         }
 200
 201         if (dh_config.informat == FORMAT_ASN1)
 202                 dh = d2i_DHparams_bio(in, NULL);
 203         else if (dh_config.informat == FORMAT_PEM)
 204                 dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
 205         else {
 206                 BIO_printf(bio_err, "bad input format specified\n");
 207                 goto end;
 208         }
 209         if (dh == NULL) {
 210                 BIO_printf(bio_err, "unable to load DH parameters\n");
 211                 ERR_print_errors(bio_err);
 212                 goto end;
 213         }
 214         if (dh_config.text) {
 215                 DHparams_print(out, dh);
 216         }
 217         if (dh_config.check) {
 218                 if (!DH_check(dh, &i)) {
 219                         ERR_print_errors(bio_err);
 220                         goto end;
 221                 }
 222                 if (i & DH_CHECK_P_NOT_PRIME)
 223                         printf("p value is not prime\n");
 224                 if (i & DH_CHECK_P_NOT_SAFE_PRIME)
 225                         printf("p value is not a safe prime\n");
 226                 if (i & DH_UNABLE_TO_CHECK_GENERATOR)
 227                         printf("unable to check the generator value\n");
 228                 if (i & DH_NOT_SUITABLE_GENERATOR)
 229                         printf("the g value is not a generator\n");
 230                 if (i == 0)
 231                         printf("DH parameters appear to be ok.\n");
 232         }
 233         if (dh_config.C) {
 234                 unsigned char *data;
 235                 int len, l, bits;
 236
 237                 len = BN_num_bytes(dh->p);
 238                 bits = BN_num_bits(dh->p);
 239                 data = malloc(len);
 240                 if (data == NULL) {
 241                         perror("malloc");
 242                         goto end;
 243                 }
 244                 l = BN_bn2bin(dh->p, data);
 245                 printf("static unsigned char dh%d_p[] = {", bits);
 246                 for (i = 0; i < l; i++) {
 247                         if ((i % 12) == 0)
 248                                 printf("\n\t");
 249                         printf("0x%02X, ", data[i]);
 250                 }
 251                 printf("\n\t};\n");
 252
 253                 l = BN_bn2bin(dh->g, data);
 254                 printf("static unsigned char dh%d_g[] = {", bits);
 255                 for (i = 0; i < l; i++) {
 256                         if ((i % 12) == 0)
 257                                 printf("\n\t");
 258                         printf("0x%02X, ", data[i]);
 259                 }
 260                 printf("\n\t};\n\n");
 261
 262                 printf("DH *get_dh%d()\n\t{\n", bits);
 263                 printf("\tDH *dh;\n\n");
 264                 printf("\tif ((dh = DH_new()) == NULL) return(NULL);\n");
 265                 printf("\tdh->p = BN_bin2bn(dh%d_p, sizeof(dh%d_p), NULL);\n",
 266                     bits, bits);
 267                 printf("\tdh->g = BN_bin2bn(dh%d_g, sizeof(dh%d_g), NULL);\n",
 268                     bits, bits);
 269                 printf("\tif ((dh->p == NULL) || (dh->g == NULL))\n");
 270                 printf("\t\treturn(NULL);\n");
 271                 printf("\treturn(dh);\n\t}\n");
 272                 free(data);
 273         }
 274         if (!dh_config.noout) {
 275                 if (dh_config.outformat == FORMAT_ASN1)
 276                         i = i2d_DHparams_bio(out, dh);
 277                 else if (dh_config.outformat == FORMAT_PEM)
 278                         i = PEM_write_bio_DHparams(out, dh);
 279                 else {
 280                         BIO_printf(bio_err, "bad output format specified for outfile\n");
 281                         goto end;
 282                 }
 283                 if (!i) {
 284                         BIO_printf(bio_err, "unable to write DH parameters\n");
 285                         ERR_print_errors(bio_err);
 286                         goto end;
 287                 }
 288         }
 289         ret = 0;
 290
 291 end:
 292         BIO_free(in);
 293         if (out != NULL)
 294                 BIO_free_all(out);
 295         if (dh != NULL)
 296                 DH_free(dh);
 297
 298         return (ret);
 299 }
 300 #endif