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 #ifndef NO_DH
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include <time.h>
  63 #include <string.h>
  64 #include "apps.h"
  65 #include <openssl/bio.h>
  66 #include <openssl/err.h>
  67 #include <openssl/bn.h>
  68 #include <openssl/dh.h>
  69 #include <openssl/x509.h>
  70 #include <openssl/pem.h>
  71
  72 #undef PROG
  73 #define PROG    dhparam_main
  74
  75 #define DEFBITS 512
  76
  77 /* -inform arg  - input format - default PEM (DER or PEM)
  78  * -outform arg - output format - default PEM
  79  * -in arg      - input file - default stdin
  80  * -out arg     - output file - default stdout
  81  * -check       - check the parameters are ok
  82  * -noout
  83  * -text
  84  * -C
  85  */
  86
  87 static void MS_CALLBACK dh_cb(int p, int n, void *arg);
  88
  89 int MAIN(int, char **);
  90
  91 int MAIN(int argc, char **argv)
  92         {
  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         char *inrand=NULL;
  99         int num = 0, g = 0;
 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         infile=NULL;
 108         outfile=NULL;
 109         informat=FORMAT_PEM;
 110         outformat=FORMAT_PEM;
 111
 112         prog=argv[0];
 113         argc--;
 114         argv++;
 115         while (argc >= 1)
 116                 {
 117                 if      (strcmp(*argv,"-inform") == 0)
 118                         {
 119                         if (--argc < 1) goto bad;
 120                         informat=str2fmt(*(++argv));
 121                         }
 122                 else if (strcmp(*argv,"-outform") == 0)
 123                         {
 124                         if (--argc < 1) goto bad;
 125                         outformat=str2fmt(*(++argv));
 126                         }
 127                 else if (strcmp(*argv,"-in") == 0)
 128                         {
 129                         if (--argc < 1) goto bad;
 130                         infile= *(++argv);
 131                         }
 132                 else if (strcmp(*argv,"-out") == 0)
 133                         {
 134                         if (--argc < 1) goto bad;
 135                         outfile= *(++argv);
 136                         }
 137                 else if (strcmp(*argv,"-check") == 0)
 138                         check=1;
 139                 else if (strcmp(*argv,"-text") == 0)
 140                         text=1;
 141                 else if (strcmp(*argv,"-C") == 0)
 142                         C=1;
 143                 else if (strcmp(*argv,"-noout") == 0)
 144                         noout=1;
 145                 else if (strcmp(*argv,"-2") == 0)
 146                         g=2;
 147                 else if (strcmp(*argv,"-5") == 0)
 148                         g=5;
 149                 else if (strcmp(*argv,"-rand") == 0)
 150                         {
 151                         if (--argc < 1) goto bad;
 152                         inrand= *(++argv);
 153                         }
 154                 else if (((sscanf(*argv,"%d",&num) == 0) || (num <= 0)))
 155                         goto bad;
 156                 argv++;
 157                 argc--;
 158                 }
 159
 160         if (badops)
 161                 {
 162 bad:
 163                 BIO_printf(bio_err,"%s [options] [numbits]\n",prog);
 164                 BIO_printf(bio_err,"where options are\n");
 165                 BIO_printf(bio_err," -inform arg   input format - one of DER PEM\n");
 166                 BIO_printf(bio_err," -outform arg  output format - one of DER PEM\n");
 167                 BIO_printf(bio_err," -in arg       input file\n");
 168                 BIO_printf(bio_err," -out arg      output file\n");
 169                 BIO_printf(bio_err," -check        check the DH parameters\n");
 170                 BIO_printf(bio_err," -text         print a text form of the DH parameters\n");
 171                 BIO_printf(bio_err," -C            Output C code\n");
 172                 BIO_printf(bio_err," -2            generate parameters using  2 as the generator value\n");
 173                 BIO_printf(bio_err," -5            generate parameters using  5 as the generator value\n");
 174                 BIO_printf(bio_err," numbits       number of bits in to generate (default 512)\n");
 175                 BIO_printf(bio_err," -rand file:file:...\n");
 176                 BIO_printf(bio_err,"               - load the file (or the files in the directory) into\n");
 177                 BIO_printf(bio_err,"               the random number generator\n");
 178                 BIO_printf(bio_err," -noout        no output\n");
 179                 goto end;
 180                 }
 181
 182         ERR_load_crypto_strings();
 183
 184         if(g && !num) num = DEFBITS;
 185         else if(num && !g) g = 2;
 186
 187         if(num) {
 188
 189                 if (!app_RAND_load_file(NULL, bio_err, 1) && inrand == NULL)
 190                         {
 191                         BIO_printf(bio_err,"warning, not much extra random data, consider using the -rand option\n");
 192                         }
 193                 if (inrand != NULL)
 194                         BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
 195                                 app_RAND_load_files(inrand));
 196
 197                 BIO_printf(bio_err,"Generating DH parameters, %d bit long strong prime, generator of %d\n",num,g);
 198                 BIO_printf(bio_err,"This is going to take a long time\n");
 199                 dh=DH_generate_parameters(num,g,dh_cb,bio_err);
 200
 201                 if (dh == NULL) goto end;
 202
 203                 app_RAND_write_file(NULL, bio_err);
 204         } else {
 205
 206                 in=BIO_new(BIO_s_file());
 207                 if (in == NULL)
 208                         {
 209                         ERR_print_errors(bio_err);
 210                         goto end;
 211                         }
 212                 if (infile == NULL)
 213                         BIO_set_fp(in,stdin,BIO_NOCLOSE);
 214                 else
 215                         {
 216                         if (BIO_read_filename(in,infile) <= 0)
 217                                 {
 218                                 perror(infile);
 219                                 goto end;
 220                                 }
 221                         }
 222
 223                 if      (informat == FORMAT_ASN1)
 224                         dh=d2i_DHparams_bio(in,NULL);
 225                 else if (informat == FORMAT_PEM)
 226                         dh=PEM_read_bio_DHparams(in,NULL,NULL,NULL);
 227                 else
 228                         {
 229                         BIO_printf(bio_err,"bad input format specified\n");
 230                         goto end;
 231                         }
 232                 if (dh == NULL)
 233                         {
 234                         BIO_printf(bio_err,"unable to load DH parameters\n");
 235                         ERR_print_errors(bio_err);
 236                         goto end;
 237                         }
 238
 239         }
 240
 241         out=BIO_new(BIO_s_file());
 242         if (out == NULL)
 243                 {
 244                 ERR_print_errors(bio_err);
 245                 goto end;
 246                 }
 247         if (outfile == NULL)
 248                 BIO_set_fp(out,stdout,BIO_NOCLOSE);
 249         else
 250                 {
 251                 if (BIO_write_filename(out,outfile) <= 0)
 252                         {
 253                         perror(outfile);
 254                         goto end;
 255                         }
 256                 }
 257
 258
 259
 260         if (text)
 261                 {
 262                 DHparams_print(out,dh);
 263                 }
 264
 265         if (check)
 266                 {
 267                 if (!DH_check(dh,&i))
 268                         {
 269                         ERR_print_errors(bio_err);
 270                         goto end;
 271                         }
 272                 if (i & DH_CHECK_P_NOT_PRIME)
 273                         printf("p value is not prime\n");
 274                 if (i & DH_CHECK_P_NOT_STRONG_PRIME)
 275                         printf("p value is not a strong prime\n");
 276                 if (i & DH_UNABLE_TO_CHECK_GENERATOR)
 277                         printf("unable to check the generator value\n");
 278                 if (i & DH_NOT_SUITABLE_GENERATOR)
 279                         printf("the g value is not a generator\n");
 280                 if (i == 0)
 281                         printf("DH parameters appear to be ok.\n");
 282                 }
 283         if (C)
 284                 {
 285                 unsigned char *data;
 286                 int len,l,bits;
 287
 288                 len=BN_num_bytes(dh->p);
 289                 bits=BN_num_bits(dh->p);
 290                 data=(unsigned char *)Malloc(len);
 291                 if (data == NULL)
 292                         {
 293                         perror("Malloc");
 294                         goto end;
 295                         }
 296                 l=BN_bn2bin(dh->p,data);
 297                 printf("static unsigned char dh%d_p[]={",bits);
 298                 for (i=0; i<l; i++)
 299                         {
 300                         if ((i%12) == 0) printf("\n\t");
 301                         printf("0x%02X,",data[i]);
 302                         }
 303                 printf("\n\t};\n");
 304
 305                 l=BN_bn2bin(dh->g,data);
 306                 printf("static unsigned char dh%d_g[]={",bits);
 307                 for (i=0; i<l; i++)
 308                         {
 309                         if ((i%12) == 0) printf("\n\t");
 310                         printf("0x%02X,",data[i]);
 311                         }
 312                 printf("\n\t};\n\n");
 313
 314                 printf("DH *get_dh%d()\n\t{\n",bits);
 315                 printf("\tDH *dh;\n\n");
 316                 printf("\tif ((dh=DH_new()) == NULL) return(NULL);\n");
 317                 printf("\tdh->p=BN_bin2bn(dh%d_p,sizeof(dh%d_p),NULL);\n",
 318                         bits,bits);
 319                 printf("\tdh->g=BN_bin2bn(dh%d_g,sizeof(dh%d_g),NULL);\n",
 320                         bits,bits);
 321                 printf("\tif ((dh->p == NULL) || (dh->g == NULL))\n");
 322                 printf("\t\treturn(NULL);\n");
 323                 printf("\treturn(dh);\n\t}\n");
 324                 Free(data);
 325                 }
 326
 327
 328         if (!noout)
 329                 {
 330                 if      (outformat == FORMAT_ASN1)
 331                         i=i2d_DHparams_bio(out,dh);
 332                 else if (outformat == FORMAT_PEM)
 333                         i=PEM_write_bio_DHparams(out,dh);
 334                 else    {
 335                         BIO_printf(bio_err,"bad output format specified for outfile\n");
 336                         goto end;
 337                         }
 338                 if (!i)
 339                         {
 340                         BIO_printf(bio_err,"unable to write DH parameters\n");
 341                         ERR_print_errors(bio_err);
 342                         goto end;
 343                         }
 344                 }
 345         ret=0;
 346 end:
 347         if (in != NULL) BIO_free(in);
 348         if (out != NULL) BIO_free(out);
 349         if (dh != NULL) DH_free(dh);
 350         EXIT(ret);
 351         }
 352
 353 static void MS_CALLBACK dh_cb(int p, int n, void *arg)
 354         {
 355         char c='*';
 356
 357         if (p == 0) c='.';
 358         if (p == 1) c='+';
 359         if (p == 2) c='*';
 360         if (p == 3) c='\n';
 361         BIO_write((BIO *)arg,&c,1);
 362         (void)BIO_flush((BIO *)arg);
 363 #ifdef LINT
 364         p=n;
 365 #endif
 366         }
 367
 368 #endif