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 512
 134
 135 /* -inform arg  - input format - default PEM (DER or PEM)
 136  * -outform arg - output format - default PEM
 137  * -in arg      - input file - default stdin
 138  * -out arg     - output file - default stdout
 139  * -dsaparam  - read or generate DSA parameters, convert to DH
 140  * -check       - check the parameters are ok
 141  * -noout
 142  * -text
 143  * -C
 144  */
 145
 146 static int MS_CALLBACK dh_cb(int p, int n, BN_GENCB *cb);
 147
 148 int MAIN(int, char **);
 149
 150 int MAIN(int argc, char **argv)
 151         {
 152 #ifndef OPENSSL_NO_ENGINE
 153         ENGINE *e = NULL;
 154 #endif
 155         DH *dh=NULL;
 156         int i,badops=0,text=0;
 157 #ifndef OPENSSL_NO_DSA
 158         int dsaparam=0;
 159 #endif
 160         BIO *in=NULL,*out=NULL;
 161         int informat,outformat,check=0,noout=0,C=0,ret=1;
 162         char *infile,*outfile,*prog;
 163         char *inrand=NULL;
 164 #ifndef OPENSSL_NO_ENGINE
 165         char *engine=NULL;
 166 #endif
 167         int num = 0, g = 0;
 168
 169         apps_startup();
 170
 171         if (bio_err == NULL)
 172                 if ((bio_err=BIO_new(BIO_s_file())) != NULL)
 173                         BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);
 174
 175         if (!load_config(bio_err, NULL))
 176                 goto end;
 177
 178         infile=NULL;
 179         outfile=NULL;
 180         informat=FORMAT_PEM;
 181         outformat=FORMAT_PEM;
 182
 183         prog=argv[0];
 184         argc--;
 185         argv++;
 186         while (argc >= 1)
 187                 {
 188                 if      (strcmp(*argv,"-inform") == 0)
 189                         {
 190                         if (--argc < 1) goto bad;
 191                         informat=str2fmt(*(++argv));
 192                         }
 193                 else if (strcmp(*argv,"-outform") == 0)
 194                         {
 195                         if (--argc < 1) goto bad;
 196                         outformat=str2fmt(*(++argv));
 197                         }
 198                 else if (strcmp(*argv,"-in") == 0)
 199                         {
 200                         if (--argc < 1) goto bad;
 201                         infile= *(++argv);
 202                         }
 203                 else if (strcmp(*argv,"-out") == 0)
 204                         {
 205                         if (--argc < 1) goto bad;
 206                         outfile= *(++argv);
 207                         }
 208 #ifndef OPENSSL_NO_ENGINE
 209                 else if (strcmp(*argv,"-engine") == 0)
 210                         {
 211                         if (--argc < 1) goto bad;
 212                         engine= *(++argv);
 213                         }
 214 #endif
 215                 else if (strcmp(*argv,"-check") == 0)
 216                         check=1;
 217                 else if (strcmp(*argv,"-text") == 0)
 218                         text=1;
 219 #ifndef OPENSSL_NO_DSA
 220                 else if (strcmp(*argv,"-dsaparam") == 0)
 221                         dsaparam=1;
 222 #endif
 223                 else if (strcmp(*argv,"-C") == 0)
 224                         C=1;
 225                 else if (strcmp(*argv,"-noout") == 0)
 226                         noout=1;
 227                 else if (strcmp(*argv,"-2") == 0)
 228                         g=2;
 229                 else if (strcmp(*argv,"-5") == 0)
 230                         g=5;
 231                 else if (strcmp(*argv,"-rand") == 0)
 232                         {
 233                         if (--argc < 1) goto bad;
 234                         inrand= *(++argv);
 235                         }
 236                 else if (((sscanf(*argv,"%d",&num) == 0) || (num <= 0)))
 237                         goto bad;
 238                 argv++;
 239                 argc--;
 240                 }
 241
 242         if (badops)
 243                 {
 244 bad:
 245                 BIO_printf(bio_err,"%s [options] [numbits]\n",prog);
 246                 BIO_printf(bio_err,"where options are\n");
 247                 BIO_printf(bio_err," -inform arg   input format - one of DER PEM\n");
 248                 BIO_printf(bio_err," -outform arg  output format - one of DER PEM\n");
 249                 BIO_printf(bio_err," -in arg       input file\n");
 250                 BIO_printf(bio_err," -out arg      output file\n");
 251 #ifndef OPENSSL_NO_DSA
 252                 BIO_printf(bio_err," -dsaparam     read or generate DSA parameters, convert to DH\n");
 253 #endif
 254                 BIO_printf(bio_err," -check        check the DH parameters\n");
 255                 BIO_printf(bio_err," -text         print a text form of the DH parameters\n");
 256                 BIO_printf(bio_err," -C            Output C code\n");
 257                 BIO_printf(bio_err," -2            generate parameters using  2 as the generator value\n");
 258                 BIO_printf(bio_err," -5            generate parameters using  5 as the generator value\n");
 259                 BIO_printf(bio_err," numbits       number of bits in to generate (default 512)\n");
 260 #ifndef OPENSSL_NO_ENGINE
 261                 BIO_printf(bio_err," -engine e     use engine e, possibly a hardware device.\n");
 262 #endif
 263                 BIO_printf(bio_err," -rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
 264                 BIO_printf(bio_err,"               - load the file (or the files in the directory) into\n");
 265                 BIO_printf(bio_err,"               the random number generator\n");
 266                 BIO_printf(bio_err," -noout        no output\n");
 267                 goto end;
 268                 }
 269
 270         ERR_load_crypto_strings();
 271
 272 #ifndef OPENSSL_NO_ENGINE
 273         e = setup_engine(bio_err, engine, 0);
 274 #endif
 275
 276         if (g && !num)
 277                 num = DEFBITS;
 278
 279 #ifndef OPENSSL_NO_DSA
 280         if (dsaparam)
 281                 {
 282                 if (g)
 283                         {
 284                         BIO_printf(bio_err, "generator may not be chosen for DSA parameters\n");
 285                         goto end;
 286                         }
 287                 }
 288         else
 289 #endif
 290                 {
 291                 /* DH parameters */
 292                 if (num && !g)
 293                         g = 2;
 294                 }
 295
 296         if(num) {
 297
 298                 BN_GENCB cb;
 299                 BN_GENCB_set(&cb, dh_cb, bio_err);
 300                 if (!app_RAND_load_file(NULL, bio_err, 1) && inrand == NULL)
 301                         {
 302                         BIO_printf(bio_err,"warning, not much extra random data, consider using the -rand option\n");
 303                         }
 304                 if (inrand != NULL)
 305                         BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
 306                                 app_RAND_load_files(inrand));
 307
 308 #ifndef OPENSSL_NO_DSA
 309                 if (dsaparam)
 310                         {
 311                         DSA *dsa = DSA_new();
 312
 313                         BIO_printf(bio_err,"Generating DSA parameters, %d bit long prime\n",num);
 314                         if(!dsa || !DSA_generate_parameters_ex(dsa, num,
 315                                                 NULL, 0, NULL, NULL, &cb))
 316                                 {
 317                                 if(dsa) DSA_free(dsa);
 318                                 ERR_print_errors(bio_err);
 319                                 goto end;
 320                                 }
 321
 322                         dh = DSA_dup_DH(dsa);
 323                         DSA_free(dsa);
 324                         if (dh == NULL)
 325                                 {
 326                                 ERR_print_errors(bio_err);
 327                                 goto end;
 328                                 }
 329                         }
 330                 else
 331 #endif
 332                         {
 333                         dh = DH_new();
 334                         BIO_printf(bio_err,"Generating DH parameters, %d bit long safe prime, generator %d\n",num,g);
 335                         BIO_printf(bio_err,"This is going to take a long time\n");
 336                         if(!dh || !DH_generate_parameters_ex(dh, num, g, &cb))
 337                                 {
 338                                 if(dh) DH_free(dh);
 339                                 ERR_print_errors(bio_err);
 340                                 goto end;
 341                                 }
 342                         }
 343
 344                 app_RAND_write_file(NULL, bio_err);
 345         } else {
 346
 347                 in=BIO_new(BIO_s_file());
 348                 if (in == NULL)
 349                         {
 350                         ERR_print_errors(bio_err);
 351                         goto end;
 352                         }
 353                 if (infile == NULL)
 354                         BIO_set_fp(in,stdin,BIO_NOCLOSE);
 355                 else
 356                         {
 357                         if (BIO_read_filename(in,infile) <= 0)
 358                                 {
 359                                 perror(infile);
 360                                 goto end;
 361                                 }
 362                         }
 363
 364                 if      (informat != FORMAT_ASN1 && informat != FORMAT_PEM)
 365                         {
 366                         BIO_printf(bio_err,"bad input format specified\n");
 367                         goto end;
 368                         }
 369
 370 #ifndef OPENSSL_NO_DSA
 371                 if (dsaparam)
 372                         {
 373                         DSA *dsa;
 374
 375                         if (informat == FORMAT_ASN1)
 376                                 dsa=d2i_DSAparams_bio(in,NULL);
 377                         else /* informat == FORMAT_PEM */
 378                                 dsa=PEM_read_bio_DSAparams(in,NULL,NULL,NULL);
 379
 380                         if (dsa == NULL)
 381                                 {
 382                                 BIO_printf(bio_err,"unable to load DSA parameters\n");
 383                                 ERR_print_errors(bio_err);
 384                                 goto end;
 385                                 }
 386
 387                         dh = DSA_dup_DH(dsa);
 388                         DSA_free(dsa);
 389                         if (dh == NULL)
 390                                 {
 391                                 ERR_print_errors(bio_err);
 392                                 goto end;
 393                                 }
 394                         }
 395                 else
 396 #endif
 397                         {
 398                         if (informat == FORMAT_ASN1)
 399                                 dh=d2i_DHparams_bio(in,NULL);
 400                         else /* informat == FORMAT_PEM */
 401                                 dh=PEM_read_bio_DHparams(in,NULL,NULL,NULL);
 402
 403                         if (dh == NULL)
 404                                 {
 405                                 BIO_printf(bio_err,"unable to load DH parameters\n");
 406                                 ERR_print_errors(bio_err);
 407                                 goto end;
 408                                 }
 409                         }
 410
 411                 /* dh != NULL */
 412         }
 413
 414         out=BIO_new(BIO_s_file());
 415         if (out == NULL)
 416                 {
 417                 ERR_print_errors(bio_err);
 418                 goto end;
 419                 }
 420         if (outfile == NULL)
 421                 {
 422                 BIO_set_fp(out,stdout,BIO_NOCLOSE);
 423 #ifdef OPENSSL_SYS_VMS
 424                 {
 425                 BIO *tmpbio = BIO_new(BIO_f_linebuffer());
 426                 out = BIO_push(tmpbio, out);
 427                 }
 428 #endif
 429                 }
 430         else
 431                 {
 432                 if (BIO_write_filename(out,outfile) <= 0)
 433                         {
 434                         perror(outfile);
 435                         goto end;
 436                         }
 437                 }
 438
 439
 440         if (text)
 441                 {
 442                 DHparams_print(out,dh);
 443                 }
 444
 445         if (check)
 446                 {
 447                 if (!DH_check(dh,&i))
 448                         {
 449                         ERR_print_errors(bio_err);
 450                         goto end;
 451                         }
 452                 if (i & DH_CHECK_P_NOT_PRIME)
 453                         printf("p value is not prime\n");
 454                 if (i & DH_CHECK_P_NOT_SAFE_PRIME)
 455                         printf("p value is not a safe prime\n");
 456                 if (i & DH_UNABLE_TO_CHECK_GENERATOR)
 457                         printf("unable to check the generator value\n");
 458                 if (i & DH_NOT_SUITABLE_GENERATOR)
 459                         printf("the g value is not a generator\n");
 460                 if (i == 0)
 461                         printf("DH parameters appear to be ok.\n");
 462                 }
 463         if (C)
 464                 {
 465                 unsigned char *data;
 466                 int len,l,bits;
 467
 468                 len=BN_num_bytes(dh->p);
 469                 bits=BN_num_bits(dh->p);
 470                 data=(unsigned char *)OPENSSL_malloc(len);
 471                 if (data == NULL)
 472                         {
 473                         perror("OPENSSL_malloc");
 474                         goto end;
 475                         }
 476                 printf("#ifndef HEADER_DH_H\n"
 477                        "#include <openssl/dh.h>\n"
 478                        "#endif\n");
 479                 printf("DH *get_dh%d()\n\t{\n",bits);
 480
 481                 l=BN_bn2bin(dh->p,data);
 482                 printf("\tstatic unsigned char dh%d_p[]={",bits);
 483                 for (i=0; i<l; i++)
 484                         {
 485                         if ((i%12) == 0) printf("\n\t\t");
 486                         printf("0x%02X,",data[i]);
 487                         }
 488                 printf("\n\t\t};\n");
 489
 490                 l=BN_bn2bin(dh->g,data);
 491                 printf("\tstatic unsigned char dh%d_g[]={",bits);
 492                 for (i=0; i<l; i++)
 493                         {
 494                         if ((i%12) == 0) printf("\n\t\t");
 495                         printf("0x%02X,",data[i]);
 496                         }
 497                 printf("\n\t\t};\n");
 498
 499                 printf("\tDH *dh;\n\n");
 500                 printf("\tif ((dh=DH_new()) == NULL) return(NULL);\n");
 501                 printf("\tdh->p=BN_bin2bn(dh%d_p,sizeof(dh%d_p),NULL);\n",
 502                         bits,bits);
 503                 printf("\tdh->g=BN_bin2bn(dh%d_g,sizeof(dh%d_g),NULL);\n",
 504                         bits,bits);
 505                 printf("\tif ((dh->p == NULL) || (dh->g == NULL))\n");
 506                 printf("\t\t{ DH_free(dh); return(NULL); }\n");
 507                 if (dh->length)
 508                         printf("\tdh->length = %ld;\n", dh->length);
 509                 printf("\treturn(dh);\n\t}\n");
 510                 OPENSSL_free(data);
 511                 }
 512
 513
 514         if (!noout)
 515                 {
 516                 if      (outformat == FORMAT_ASN1)
 517                         i=i2d_DHparams_bio(out,dh);
 518                 else if (outformat == FORMAT_PEM)
 519                         i=PEM_write_bio_DHparams(out,dh);
 520                 else    {
 521                         BIO_printf(bio_err,"bad output format specified for outfile\n");
 522                         goto end;
 523                         }
 524                 if (!i)
 525                         {
 526                         BIO_printf(bio_err,"unable to write DH parameters\n");
 527                         ERR_print_errors(bio_err);
 528                         goto end;
 529                         }
 530                 }
 531         ret=0;
 532 end:
 533         if (in != NULL) BIO_free(in);
 534         if (out != NULL) BIO_free_all(out);
 535         if (dh != NULL) DH_free(dh);
 536         apps_shutdown();
 537         OPENSSL_EXIT(ret);
 538         }
 539
 540 /* dh_cb is identical to dsa_cb in apps/dsaparam.c */
 541 static int MS_CALLBACK dh_cb(int p, int n, BN_GENCB *cb)
 542         {
 543         char c='*';
 544
 545         if (p == 0) c='.';
 546         if (p == 1) c='+';
 547         if (p == 2) c='*';
 548         if (p == 3) c='\n';
 549         BIO_write(cb->arg,&c,1);
 550         (void)BIO_flush(cb->arg);
 551 #ifdef LINT
 552         p=n;
 553 #endif
 554         return 1;
 555         }
 556
 557 #endif