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