apps/dhparam.c

   1 /* apps/dhparam.c */
   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  * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111
 112 #include <openssl/opensslconf.h>        /* for OPENSSL_NO_DH */
 113 #ifndef OPENSSL_NO_DH
 114 #include <stdio.h>
 115 #include <stdlib.h>
 116 #include <time.h>
 117 #include <string.h>
 118 #include "apps.h"
 119 #include <openssl/bio.h>
 120 #include <openssl/err.h>
 121 #include <openssl/bn.h>
 122 #include <openssl/dh.h>
 123 #include <openssl/x509.h>
 124 #include <openssl/pem.h>
 125
 126 #ifndef OPENSSL_NO_DSA
 127 #include <openssl/dsa.h>
 128 #endif
 129
 130 #undef PROG
 131 #define PROG    dhparam_main
 132
 133 #define DEFBITS 2048
 134
 135 /*-
 136  * -inform arg  - input format - default PEM (DER or PEM)
 137  * -outform arg - output format - default PEM
 138  * -in arg      - input file - default stdin
 139  * -out arg     - output file - default stdout
 140  * -dsaparam  - read or generate DSA parameters, convert to DH
 141  * -check       - check the parameters are ok
 142  * -noout
 143  * -text
 144  * -C
 145  */
 146
 147 static int MS_CALLBACK dh_cb(int p, int n, BN_GENCB *cb);
 148
 149 int MAIN(int, char **);
 150
 151 int MAIN(int argc, char **argv)
 152         {
 153         DH *dh=NULL;
 154         int i,badops=0,text=0;
 155 #ifndef OPENSSL_NO_DSA
 156         int dsaparam=0;
 157 #endif
 158         BIO *in=NULL,*out=NULL;
 159         int informat,outformat,check=0,noout=0,C=0,ret=1;
 160         char *infile,*outfile,*prog;
 161         char *inrand=NULL;
 162 #ifndef OPENSSL_NO_ENGINE
 163         char *engine=NULL;
 164 #endif
 165         int num = 0, g = 0;
 166
 167         apps_startup();
 168
 169         if (bio_err == NULL)
 170                 if ((bio_err=BIO_new(BIO_s_file())) != NULL)
 171                         BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);
 172
 173         if (!load_config(bio_err, NULL))
 174                 goto end;
 175
 176         infile=NULL;
 177         outfile=NULL;
 178         informat=FORMAT_PEM;
 179         outformat=FORMAT_PEM;
 180
 181         prog=argv[0];
 182         argc--;
 183         argv++;
 184         while (argc >= 1)
 185                 {
 186                 if      (strcmp(*argv,"-inform") == 0)
 187                         {
 188                         if (--argc < 1) goto bad;
 189                         informat=str2fmt(*(++argv));
 190                         }
 191                 else if (strcmp(*argv,"-outform") == 0)
 192                         {
 193                         if (--argc < 1) goto bad;
 194                         outformat=str2fmt(*(++argv));
 195                         }
 196                 else if (strcmp(*argv,"-in") == 0)
 197                         {
 198                         if (--argc < 1) goto bad;
 199                         infile= *(++argv);
 200                         }
 201                 else if (strcmp(*argv,"-out") == 0)
 202                         {
 203                         if (--argc < 1) goto bad;
 204                         outfile= *(++argv);
 205                         }
 206 #ifndef OPENSSL_NO_ENGINE
 207                 else if (strcmp(*argv,"-engine") == 0)
 208                         {
 209                         if (--argc < 1) goto bad;
 210                         engine= *(++argv);
 211                         }
 212 #endif
 213                 else if (strcmp(*argv,"-check") == 0)
 214                         check=1;
 215                 else if (strcmp(*argv,"-text") == 0)
 216                         text=1;
 217 #ifndef OPENSSL_NO_DSA
 218                 else if (strcmp(*argv,"-dsaparam") == 0)
 219                         dsaparam=1;
 220 #endif
 221                 else if (strcmp(*argv,"-C") == 0)
 222                         C=1;
 223                 else if (strcmp(*argv,"-noout") == 0)
 224                         noout=1;
 225                 else if (strcmp(*argv,"-2") == 0)
 226                         g=2;
 227                 else if (strcmp(*argv,"-5") == 0)
 228                         g=5;
 229                 else if (strcmp(*argv,"-rand") == 0)
 230                         {
 231                         if (--argc < 1) goto bad;
 232                         inrand= *(++argv);
 233                         }
 234                 else if (((sscanf(*argv,"%d",&num) == 0) || (num <= 0)))
 235                         goto bad;
 236                 argv++;
 237                 argc--;
 238                 }
 239
 240         if (badops)
 241                 {
 242 bad:
 243                 BIO_printf(bio_err,"%s [options] [numbits]\n",prog);
 244                 BIO_printf(bio_err,"where options are\n");
 245                 BIO_printf(bio_err," -inform arg   input format - one of DER PEM\n");
 246                 BIO_printf(bio_err," -outform arg  output format - one of DER PEM\n");
 247                 BIO_printf(bio_err," -in arg       input file\n");
 248                 BIO_printf(bio_err," -out arg      output file\n");
 249 #ifndef OPENSSL_NO_DSA
 250                 BIO_printf(bio_err," -dsaparam     read or generate DSA parameters, convert to DH\n");
 251 #endif
 252                 BIO_printf(bio_err," -check        check the DH parameters\n");
 253                 BIO_printf(bio_err," -text         print a text form of the DH parameters\n");
 254                 BIO_printf(bio_err," -C            Output C code\n");
 255                 BIO_printf(bio_err," -2            generate parameters using  2 as the generator value\n");
 256                 BIO_printf(bio_err," -5            generate parameters using  5 as the generator value\n");
 257                 BIO_printf(bio_err," numbits       number of bits in to generate (default 2048)\n");
 258 #ifndef OPENSSL_NO_ENGINE
 259                 BIO_printf(bio_err," -engine e     use engine e, possibly a hardware device.\n");
 260 #endif
 261                 BIO_printf(bio_err," -rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
 262                 BIO_printf(bio_err,"               - load the file (or the files in the directory) into\n");
 263                 BIO_printf(bio_err,"               the random number generator\n");
 264                 BIO_printf(bio_err," -noout        no output\n");
 265                 goto end;
 266                 }
 267
 268         ERR_load_crypto_strings();
 269
 270 #ifndef OPENSSL_NO_ENGINE
 271         setup_engine(bio_err, engine, 0);
 272 #endif
 273
 274         if (g && !num)
 275                 num = DEFBITS;
 276
 277 #ifndef OPENSSL_NO_DSA
 278         if (dsaparam)
 279                 {
 280                 if (g)
 281                         {
 282                         BIO_printf(bio_err, "generator may not be chosen for DSA parameters\n");
 283                         goto end;
 284                         }
 285                 }
 286         else
 287 #endif
 288                 {
 289                 /* DH parameters */
 290                 if (num && !g)
 291                         g = 2;
 292                 }
 293
 294         if(num) {
 295
 296                 BN_GENCB *cb;
 297                 cb = BN_GENCB_new();
 298                 if(!cb)
 299                         {
 300                         ERR_print_errors(bio_err);
 301                         goto end;
 302                         }
 303
 304                 BN_GENCB_set(cb, dh_cb, bio_err);
 305                 if (!app_RAND_load_file(NULL, bio_err, 1) && inrand == NULL)
 306                         {
 307                         BIO_printf(bio_err,"warning, not much extra random data, consider using the -rand option\n");
 308                         }
 309                 if (inrand != NULL)
 310                         BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
 311                                 app_RAND_load_files(inrand));
 312
 313 #ifndef OPENSSL_NO_DSA
 314                 if (dsaparam)
 315                         {
 316                         DSA *dsa = DSA_new();
 317
 318                         BIO_printf(bio_err,"Generating DSA parameters, %d bit long prime\n",num);
 319                         if(!dsa || !DSA_generate_parameters_ex(dsa, num,
 320                                                 NULL, 0, NULL, NULL, cb))
 321                                 {
 322                                 if(dsa) DSA_free(dsa);
 323                                 BN_GENCB_free(cb);
 324                                 ERR_print_errors(bio_err);
 325                                 goto end;
 326                                 }
 327
 328                         dh = DSA_dup_DH(dsa);
 329                         DSA_free(dsa);
 330                         if (dh == NULL)
 331                                 {
 332                                 BN_GENCB_free(cb);
 333                                 ERR_print_errors(bio_err);
 334                                 goto end;
 335                                 }
 336                         }
 337                 else
 338 #endif
 339                         {
 340                         dh = DH_new();
 341                         BIO_printf(bio_err,"Generating DH parameters, %d bit long safe prime, generator %d\n",num,g);
 342                         BIO_printf(bio_err,"This is going to take a long time\n");
 343                         if(!dh || !DH_generate_parameters_ex(dh, num, g, cb))
 344                                 {
 345                                 BN_GENCB_free(cb);
 346                                 ERR_print_errors(bio_err);
 347                                 goto end;
 348                                 }
 349                         }
 350
 351                 BN_GENCB_free(cb);
 352                 app_RAND_write_file(NULL, bio_err);
 353         } else {
 354
 355                 in=BIO_new(BIO_s_file());
 356                 if (in == NULL)
 357                         {
 358                         ERR_print_errors(bio_err);
 359                         goto end;
 360                         }
 361                 if (infile == NULL)
 362                         BIO_set_fp(in,stdin,BIO_NOCLOSE);
 363                 else
 364                         {
 365                         if (BIO_read_filename(in,infile) <= 0)
 366                                 {
 367                                 perror(infile);
 368                                 goto end;
 369                                 }
 370                         }
 371
 372                 if      (informat != FORMAT_ASN1 && informat != FORMAT_PEM)
 373                         {
 374                         BIO_printf(bio_err,"bad input format specified\n");
 375                         goto end;
 376                         }
 377
 378 #ifndef OPENSSL_NO_DSA
 379                 if (dsaparam)
 380                         {
 381                         DSA *dsa;
 382
 383                         if (informat == FORMAT_ASN1)
 384                                 dsa=d2i_DSAparams_bio(in,NULL);
 385                         else /* informat == FORMAT_PEM */
 386                                 dsa=PEM_read_bio_DSAparams(in,NULL,NULL,NULL);
 387
 388                         if (dsa == NULL)
 389                                 {
 390                                 BIO_printf(bio_err,"unable to load DSA parameters\n");
 391                                 ERR_print_errors(bio_err);
 392                                 goto end;
 393                                 }
 394
 395                         dh = DSA_dup_DH(dsa);
 396                         DSA_free(dsa);
 397                         if (dh == NULL)
 398                                 {
 399                                 ERR_print_errors(bio_err);
 400                                 goto end;
 401                                 }
 402                         }
 403                 else
 404 #endif
 405                         {
 406                         if (informat == FORMAT_ASN1)
 407                                 dh=d2i_DHparams_bio(in,NULL);
 408                         else /* informat == FORMAT_PEM */
 409                                 dh=PEM_read_bio_DHparams(in,NULL,NULL,NULL);
 410
 411                         if (dh == NULL)
 412                                 {
 413                                 BIO_printf(bio_err,"unable to load DH parameters\n");
 414                                 ERR_print_errors(bio_err);
 415                                 goto end;
 416                                 }
 417                         }
 418
 419                 /* dh != NULL */
 420         }
 421
 422         out=BIO_new(BIO_s_file());
 423         if (out == NULL)
 424                 {
 425                 ERR_print_errors(bio_err);
 426                 goto end;
 427                 }
 428         if (outfile == NULL)
 429                 {
 430                 BIO_set_fp(out,stdout,BIO_NOCLOSE);
 431 #ifdef OPENSSL_SYS_VMS
 432                 {
 433                 BIO *tmpbio = BIO_new(BIO_f_linebuffer());
 434                 out = BIO_push(tmpbio, out);
 435                 }
 436 #endif
 437                 }
 438         else
 439                 {
 440                 if (BIO_write_filename(out,outfile) <= 0)
 441                         {
 442                         perror(outfile);
 443                         goto end;
 444                         }
 445                 }
 446
 447
 448         if (text)
 449                 {
 450                 DHparams_print(out,dh);
 451                 }
 452
 453         if (check)
 454                 {
 455                 if (!DH_check(dh,&i))
 456                         {
 457                         ERR_print_errors(bio_err);
 458                         goto end;
 459                         }
 460                 if (i & DH_CHECK_P_NOT_PRIME)
 461                         printf("p value is not prime\n");
 462                 if (i & DH_CHECK_P_NOT_SAFE_PRIME)
 463                         printf("p value is not a safe prime\n");
 464                 if (i & DH_UNABLE_TO_CHECK_GENERATOR)
 465                         printf("unable to check the generator value\n");
 466                 if (i & DH_NOT_SUITABLE_GENERATOR)
 467                         printf("the g value is not a generator\n");
 468                 if (i == 0)
 469                         printf("DH parameters appear to be ok.\n");
 470                 }
 471         if (C)
 472                 {
 473                 unsigned char *data;
 474                 int len,l,bits;
 475
 476                 len=BN_num_bytes(dh->p);
 477                 bits=BN_num_bits(dh->p);
 478                 data=(unsigned char *)OPENSSL_malloc(len);
 479                 if (data == NULL)
 480                         {
 481                         perror("OPENSSL_malloc");
 482                         goto end;
 483                         }
 484                 printf("#ifndef HEADER_DH_H\n"
 485                        "#include <openssl/dh.h>\n"
 486                        "#endif\n");
 487                 printf("DH *get_dh%d()\n\t{\n",bits);
 488
 489                 l=BN_bn2bin(dh->p,data);
 490                 printf("\tstatic unsigned char dh%d_p[]={",bits);
 491                 for (i=0; i<l; i++)
 492                         {
 493                         if ((i%12) == 0) printf("\n\t\t");
 494                         printf("0x%02X,",data[i]);
 495                         }
 496                 printf("\n\t\t};\n");
 497
 498                 l=BN_bn2bin(dh->g,data);
 499                 printf("\tstatic unsigned char dh%d_g[]={",bits);
 500                 for (i=0; i<l; i++)
 501                         {
 502                         if ((i%12) == 0) printf("\n\t\t");
 503                         printf("0x%02X,",data[i]);
 504                         }
 505                 printf("\n\t\t};\n");
 506
 507                 printf("\tDH *dh;\n\n");
 508                 printf("\tif ((dh=DH_new()) == NULL) return(NULL);\n");
 509                 printf("\tdh->p=BN_bin2bn(dh%d_p,sizeof(dh%d_p),NULL);\n",
 510                         bits,bits);
 511                 printf("\tdh->g=BN_bin2bn(dh%d_g,sizeof(dh%d_g),NULL);\n",
 512                         bits,bits);
 513                 printf("\tif ((dh->p == NULL) || (dh->g == NULL))\n");
 514                 printf("\t\t{ DH_free(dh); return(NULL); }\n");
 515                 if (dh->length)
 516                         printf("\tdh->length = %ld;\n", dh->length);
 517                 printf("\treturn(dh);\n\t}\n");
 518                 OPENSSL_free(data);
 519                 }
 520
 521
 522         if (!noout)
 523                 {
 524                 if      (outformat == FORMAT_ASN1)
 525                         i=i2d_DHparams_bio(out,dh);
 526                 else if (outformat == FORMAT_PEM)
 527                         {
 528                         if (dh->q)
 529                                 i=PEM_write_bio_DHxparams(out,dh);
 530                         else
 531                                 i=PEM_write_bio_DHparams(out,dh);
 532                         }
 533                 else    {
 534                         BIO_printf(bio_err,"bad output format specified for outfile\n");
 535                         goto end;
 536                         }
 537                 if (!i)
 538                         {
 539                         BIO_printf(bio_err,"unable to write DH parameters\n");
 540                         ERR_print_errors(bio_err);
 541                         goto end;
 542                         }
 543                 }
 544         ret=0;
 545 end:
 546         if (in != NULL) BIO_free(in);
 547         if (out != NULL) BIO_free_all(out);
 548         if (dh != NULL) DH_free(dh);
 549         apps_shutdown();
 550         OPENSSL_EXIT(ret);
 551         }
 552
 553 /* dh_cb is identical to dsa_cb in apps/dsaparam.c */
 554 static int MS_CALLBACK dh_cb(int p, int n, BN_GENCB *cb)
 555         {
 556         char c='*';
 557
 558         if (p == 0) c='.';
 559         if (p == 1) c='+';
 560         if (p == 2) c='*';
 561         if (p == 3) c='\n';
 562         BIO_write(BN_GENCB_get_arg(cb),&c,1);
 563         (void)BIO_flush(BN_GENCB_get_arg(cb));
 564         return 1;
 565         }
 566
 567 #else /* !OPENSSL_NO_DH */
 568
 569 # if PEDANTIC
 570 static void *dummy=&dummy;
 571 # endif
 572
 573 #endif