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 #ifndef OPENSSL_NO_DH
  61 #include <stdio.h>
  62 #include <stdlib.h>
  63 #include <time.h>
  64 #include <string.h>
  65 #include "apps.h"
  66 #include <openssl/bio.h>
  67 #include <openssl/err.h>
  68 #include <openssl/bn.h>
  69 #include <openssl/dh.h>
  70 #include <openssl/x509.h>
  71 #include <openssl/pem.h>
  72
  73 #undef PROG
  74 #define PROG    dh_main
  75
  76 /* -inform arg  - input format - default PEM (DER or PEM)
  77  * -outform arg - output format - default PEM
  78  * -in arg      - input file - default stdin
  79  * -out arg     - output file - default stdout
  80  * -check       - check the parameters are ok
  81  * -noout
  82  * -text
  83  * -C
  84  */
  85
  86 int MAIN(int, char **);
  87
  88 int MAIN(int argc, char **argv)
  89         {
  90 #ifndef OPENSSL_NO_ENGINE
  91         ENGINE *e = NULL;
  92 #endif
  93         DH *dh=NULL;
  94         int i,badops=0,text=0;
  95         BIO *in=NULL,*out=NULL;
  96         int informat,outformat,check=0,noout=0,C=0,ret=1;
  97         char *infile,*outfile,*prog;
  98 #ifndef OPENSSL_NO_ENGINE
  99         char *engine;
 100 #endif
 101
 102         apps_startup();
 103
 104         if (bio_err == NULL)
 105                 if ((bio_err=BIO_new(BIO_s_file())) != NULL)
 106                         BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);
 107
 108         if (!load_config(bio_err, NULL))
 109                 goto end;
 110
 111 #ifndef OPENSSL_NO_ENGINE
 112         engine=NULL;
 113 #endif
 114         infile=NULL;
 115         outfile=NULL;
 116         informat=FORMAT_PEM;
 117         outformat=FORMAT_PEM;
 118
 119         prog=argv[0];
 120         argc--;
 121         argv++;
 122         while (argc >= 1)
 123                 {
 124                 if      (strcmp(*argv,"-inform") == 0)
 125                         {
 126                         if (--argc < 1) goto bad;
 127                         informat=str2fmt(*(++argv));
 128                         }
 129                 else if (strcmp(*argv,"-outform") == 0)
 130                         {
 131                         if (--argc < 1) goto bad;
 132                         outformat=str2fmt(*(++argv));
 133                         }
 134                 else if (strcmp(*argv,"-in") == 0)
 135                         {
 136                         if (--argc < 1) goto bad;
 137                         infile= *(++argv);
 138                         }
 139                 else if (strcmp(*argv,"-out") == 0)
 140                         {
 141                         if (--argc < 1) goto bad;
 142                         outfile= *(++argv);
 143                         }
 144 #ifndef OPENSSL_NO_ENGINE
 145                 else if (strcmp(*argv,"-engine") == 0)
 146                         {
 147                         if (--argc < 1) goto bad;
 148                         engine= *(++argv);
 149                         }
 150 #endif
 151                 else if (strcmp(*argv,"-check") == 0)
 152                         check=1;
 153                 else if (strcmp(*argv,"-text") == 0)
 154                         text=1;
 155                 else if (strcmp(*argv,"-C") == 0)
 156                         C=1;
 157                 else if (strcmp(*argv,"-noout") == 0)
 158                         noout=1;
 159                 else
 160                         {
 161                         BIO_printf(bio_err,"unknown option %s\n",*argv);
 162                         badops=1;
 163                         break;
 164                         }
 165                 argc--;
 166                 argv++;
 167                 }
 168
 169         if (badops)
 170                 {
 171 bad:
 172                 BIO_printf(bio_err,"%s [options] <infile >outfile\n",prog);
 173                 BIO_printf(bio_err,"where options are\n");
 174                 BIO_printf(bio_err," -inform arg   input format - one of DER PEM\n");
 175                 BIO_printf(bio_err," -outform arg  output format - one of DER PEM\n");
 176                 BIO_printf(bio_err," -in arg       input file\n");
 177                 BIO_printf(bio_err," -out arg      output file\n");
 178                 BIO_printf(bio_err," -check        check the DH parameters\n");
 179                 BIO_printf(bio_err," -text         print a text form of the DH parameters\n");
 180                 BIO_printf(bio_err," -C            Output C code\n");
 181                 BIO_printf(bio_err," -noout        no output\n");
 182 #ifndef OPENSSL_NO_ENGINE
 183                 BIO_printf(bio_err," -engine e     use engine e, possibly a hardware device.\n");
 184 #endif
 185                 goto end;
 186                 }
 187
 188         ERR_load_crypto_strings();
 189
 190 #ifndef OPENSSL_NO_ENGINE
 191         e = setup_engine(bio_err, engine, 0);
 192 #endif
 193
 194         in=BIO_new(BIO_s_file());
 195         out=BIO_new(BIO_s_file());
 196         if ((in == NULL) || (out == NULL))
 197                 {
 198                 ERR_print_errors(bio_err);
 199                 goto end;
 200                 }
 201
 202         if (infile == NULL)
 203                 BIO_set_fp(in,stdin,BIO_NOCLOSE);
 204         else
 205                 {
 206                 if (BIO_read_filename(in,infile) <= 0)
 207                         {
 208                         perror(infile);
 209                         goto end;
 210                         }
 211                 }
 212         if (outfile == NULL)
 213                 {
 214                 BIO_set_fp(out,stdout,BIO_NOCLOSE);
 215 #ifdef OPENSSL_SYS_VMS
 216                 {
 217                 BIO *tmpbio = BIO_new(BIO_f_linebuffer());
 218                 out = BIO_push(tmpbio, out);
 219                 }
 220 #endif
 221                 }
 222         else
 223                 {
 224                 if (BIO_write_filename(out,outfile) <= 0)
 225                         {
 226                         perror(outfile);
 227                         goto end;
 228                         }
 229                 }
 230
 231         if      (informat == FORMAT_ASN1)
 232                 dh=d2i_DHparams_bio(in,NULL);
 233         else if (informat == FORMAT_PEM)
 234                 dh=PEM_read_bio_DHparams(in,NULL,NULL,NULL);
 235         else
 236                 {
 237                 BIO_printf(bio_err,"bad input format specified\n");
 238                 goto end;
 239                 }
 240         if (dh == NULL)
 241                 {
 242                 BIO_printf(bio_err,"unable to load DH parameters\n");
 243                 ERR_print_errors(bio_err);
 244                 goto end;
 245                 }
 246
 247
 248
 249         if (text)
 250                 {
 251                 DHparams_print(out,dh);
 252 #ifdef undef
 253                 printf("p=");
 254                 BN_print(stdout,dh->p);
 255                 printf("\ng=");
 256                 BN_print(stdout,dh->g);
 257                 printf("\n");
 258                 if (dh->length != 0)
 259                         printf("recommended private length=%ld\n",dh->length);
 260 #endif
 261                 }
 262
 263         if (check)
 264                 {
 265                 if (!DH_check(dh,&i))
 266                         {
 267                         ERR_print_errors(bio_err);
 268                         goto end;
 269                         }
 270                 if (i & DH_CHECK_P_NOT_PRIME)
 271                         printf("p value is not prime\n");
 272                 if (i & DH_CHECK_P_NOT_SAFE_PRIME)
 273                         printf("p value is not a safe prime\n");
 274                 if (i & DH_UNABLE_TO_CHECK_GENERATOR)
 275                         printf("unable to check the generator value\n");
 276                 if (i & DH_NOT_SUITABLE_GENERATOR)
 277                         printf("the g value is not a generator\n");
 278                 if (i == 0)
 279                         printf("DH parameters appear to be ok.\n");
 280                 }
 281         if (C)
 282                 {
 283                 unsigned char *data;
 284                 int len,l,bits;
 285
 286                 len=BN_num_bytes(dh->p);
 287                 bits=BN_num_bits(dh->p);
 288                 data=(unsigned char *)OPENSSL_malloc(len);
 289                 if (data == NULL)
 290                         {
 291                         perror("OPENSSL_malloc");
 292                         goto end;
 293                         }
 294                 l=BN_bn2bin(dh->p,data);
 295                 printf("static unsigned char dh%d_p[]={",bits);
 296                 for (i=0; i<l; i++)
 297                         {
 298                         if ((i%12) == 0) printf("\n\t");
 299                         printf("0x%02X,",data[i]);
 300                         }
 301                 printf("\n\t};\n");
 302
 303                 l=BN_bn2bin(dh->g,data);
 304                 printf("static unsigned char dh%d_g[]={",bits);
 305                 for (i=0; i<l; i++)
 306                         {
 307                         if ((i%12) == 0) printf("\n\t");
 308                         printf("0x%02X,",data[i]);
 309                         }
 310                 printf("\n\t};\n\n");
 311
 312                 printf("DH *get_dh%d()\n\t{\n",bits);
 313                 printf("\tDH *dh;\n\n");
 314                 printf("\tif ((dh=DH_new()) == NULL) return(NULL);\n");
 315                 printf("\tdh->p=BN_bin2bn(dh%d_p,sizeof(dh%d_p),NULL);\n",
 316                         bits,bits);
 317                 printf("\tdh->g=BN_bin2bn(dh%d_g,sizeof(dh%d_g),NULL);\n",
 318                         bits,bits);
 319                 printf("\tif ((dh->p == NULL) || (dh->g == NULL))\n");
 320                 printf("\t\treturn(NULL);\n");
 321                 printf("\treturn(dh);\n\t}\n");
 322                 OPENSSL_free(data);
 323                 }
 324
 325
 326         if (!noout)
 327                 {
 328                 if      (outformat == FORMAT_ASN1)
 329                         i=i2d_DHparams_bio(out,dh);
 330                 else if (outformat == FORMAT_PEM)
 331                         i=PEM_write_bio_DHparams(out,dh);
 332                 else    {
 333                         BIO_printf(bio_err,"bad output format specified for outfile\n");
 334                         goto end;
 335                         }
 336                 if (!i)
 337                         {
 338                         BIO_printf(bio_err,"unable to write DH parameters\n");
 339                         ERR_print_errors(bio_err);
 340                         goto end;
 341                         }
 342                 }
 343         ret=0;
 344 end:
 345         if (in != NULL) BIO_free(in);
 346         if (out != NULL) BIO_free_all(out);
 347         if (dh != NULL) DH_free(dh);
 348         apps_shutdown();
 349         OPENSSL_EXIT(ret);
 350         }
 351 #endif