apps/dh.c

   1 /* apps/dh.c */
   2 /* Copyright (C) 1995-1997 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 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <time.h>
  62 #include <string.h>
  63 #include "apps.h"
  64 #include "bio.h"
  65 #include "err.h"
  66 #include "bn.h"
  67 #include "dh.h"
  68 #include "x509.h"
  69 #include "pem.h"
  70
  71 #undef PROG
  72 #define PROG    dh_main
  73
  74 /* -inform arg  - input format - default PEM (one of DER, TXT or PEM)
  75  * -outform arg - output format - default PEM
  76  * -in arg      - input file - default stdin
  77  * -out arg     - output file - default stdout
  78  * -check       - check the parameters are ok
  79  * -noout
  80  * -text
  81  * -C
  82  */
  83
  84 int MAIN(argc, argv)
  85 int argc;
  86 char **argv;
  87         {
  88         DH *dh=NULL;
  89         int i,badops=0,text=0;
  90         BIO *in=NULL,*out=NULL;
  91         int informat,outformat,check=0,noout=0,C=0,ret=1;
  92         char *infile,*outfile,*prog;
  93
  94         apps_startup();
  95
  96         if (bio_err == NULL)
  97                 if ((bio_err=BIO_new(BIO_s_file())) != NULL)
  98                         BIO_set_fp(bio_err,stderr,BIO_NOCLOSE);
  99
 100         infile=NULL;
 101         outfile=NULL;
 102         informat=FORMAT_PEM;
 103         outformat=FORMAT_PEM;
 104
 105         prog=argv[0];
 106         argc--;
 107         argv++;
 108         while (argc >= 1)
 109                 {
 110                 if      (strcmp(*argv,"-inform") == 0)
 111                         {
 112                         if (--argc < 1) goto bad;
 113                         informat=str2fmt(*(++argv));
 114                         }
 115                 else if (strcmp(*argv,"-outform") == 0)
 116                         {
 117                         if (--argc < 1) goto bad;
 118                         outformat=str2fmt(*(++argv));
 119                         }
 120                 else if (strcmp(*argv,"-in") == 0)
 121                         {
 122                         if (--argc < 1) goto bad;
 123                         infile= *(++argv);
 124                         }
 125                 else if (strcmp(*argv,"-out") == 0)
 126                         {
 127                         if (--argc < 1) goto bad;
 128                         outfile= *(++argv);
 129                         }
 130                 else if (strcmp(*argv,"-check") == 0)
 131                         check=1;
 132                 else if (strcmp(*argv,"-text") == 0)
 133                         text=1;
 134                 else if (strcmp(*argv,"-C") == 0)
 135                         C=1;
 136                 else if (strcmp(*argv,"-noout") == 0)
 137                         noout=1;
 138                 else
 139                         {
 140                         BIO_printf(bio_err,"unknown option %s\n",*argv);
 141                         badops=1;
 142                         break;
 143                         }
 144                 argc--;
 145                 argv++;
 146                 }
 147
 148         if (badops)
 149                 {
 150 bad:
 151                 BIO_printf(bio_err,"%s [options] <infile >outfile\n",prog);
 152                 BIO_printf(bio_err,"where options are\n");
 153                 BIO_printf(bio_err," -inform arg   input format - one of DER TXT PEM\n");
 154                 BIO_printf(bio_err," -outform arg  output format - one of DER TXT PEM\n");
 155                 BIO_printf(bio_err," -in arg       inout file\n");
 156                 BIO_printf(bio_err," -out arg      output file\n");
 157                 BIO_printf(bio_err," -check        check the DH parameters\n");
 158                 BIO_printf(bio_err," -text         check the DH parameters\n");
 159                 BIO_printf(bio_err," -C            Output C code\n");
 160                 BIO_printf(bio_err," -noout        no output\n");
 161                 goto end;
 162                 }
 163
 164         ERR_load_crypto_strings();
 165
 166         in=BIO_new(BIO_s_file());
 167         out=BIO_new(BIO_s_file());
 168         if ((in == NULL) || (out == NULL))
 169                 {
 170                 ERR_print_errors(bio_err);
 171                 goto end;
 172                 }
 173
 174         if (infile == NULL)
 175                 BIO_set_fp(in,stdin,BIO_NOCLOSE);
 176         else
 177                 {
 178                 if (BIO_read_filename(in,infile) <= 0)
 179                         {
 180                         perror(infile);
 181                         goto end;
 182                         }
 183                 }
 184         if (outfile == NULL)
 185                 BIO_set_fp(out,stdout,BIO_NOCLOSE);
 186         else
 187                 {
 188                 if (BIO_write_filename(out,outfile) <= 0)
 189                         {
 190                         perror(outfile);
 191                         goto end;
 192                         }
 193                 }
 194
 195         if      (informat == FORMAT_ASN1)
 196                 dh=d2i_DHparams_bio(in,NULL);
 197         else if (informat == FORMAT_PEM)
 198                 dh=PEM_read_bio_DHparams(in,NULL,NULL);
 199         else
 200                 {
 201                 BIO_printf(bio_err,"bad input format specified\n");
 202                 goto end;
 203                 }
 204         if (dh == NULL)
 205                 {
 206                 BIO_printf(bio_err,"unable to load DH parameters\n");
 207                 ERR_print_errors(bio_err);
 208                 goto end;
 209                 }
 210
 211
 212
 213         if (text)
 214                 {
 215                 DHparams_print(out,dh);
 216 #ifdef undef
 217                 printf("p=");
 218                 BN_print(stdout,dh->p);
 219                 printf("\ng=");
 220                 BN_print(stdout,dh->g);
 221                 printf("\n");
 222                 if (dh->length != 0)
 223                         printf("recomented private length=%ld\n",dh->length);
 224 #endif
 225                 }
 226
 227         if (check)
 228                 {
 229                 if (!DH_check(dh,&i))
 230                         {
 231                         ERR_print_errors(bio_err);
 232                         goto end;
 233                         }
 234                 if (i & DH_CHECK_P_NOT_PRIME)
 235                         printf("p value is not prime\n");
 236                 if (i & DH_CHECK_P_NOT_STRONG_PRIME)
 237                         printf("p value is not a strong prime\n");
 238                 if (i & DH_UNABLE_TO_CHECK_GENERATOR)
 239                         printf("unable to check the generator value\n");
 240                 if (i & DH_NOT_SUITABLE_GENERATOR)
 241                         printf("the g value is not a generator\n");
 242                 if (i == 0)
 243                         printf("DH parameters appear to be ok.\n");
 244                 }
 245         if (C)
 246                 {
 247                 unsigned char *data;
 248                 int len,l,bits;
 249
 250                 len=BN_num_bytes(dh->p);
 251                 bits=BN_num_bits(dh->p);
 252                 data=(unsigned char *)Malloc(len);
 253                 if (data == NULL)
 254                         {
 255                         perror("Malloc");
 256                         goto end;
 257                         }
 258                 l=BN_bn2bin(dh->p,data);
 259                 printf("static unsigned char dh%d_p[]={",bits);
 260                 for (i=0; i<l; i++)
 261                         {
 262                         if ((i%12) == 0) printf("\n\t");
 263                         printf("0x%02X,",data[i]);
 264                         }
 265                 printf("\n\t};\n");
 266
 267                 l=BN_bn2bin(dh->g,data);
 268                 printf("static unsigned char dh%d_g[]={",bits);
 269                 for (i=0; i<l; i++)
 270                         {
 271                         if ((i%12) == 0) printf("\n\t");
 272                         printf("0x%02X,",data[i]);
 273                         }
 274                 printf("\n\t};\n\n");
 275
 276                 printf("DH *get_dh%d()\n\t{\n",bits);
 277                 printf("\tDH *dh;\n\n");
 278                 printf("\tif ((dh=DH_new()) == NULL) return(NULL);\n");
 279                 printf("\tdh->p=BN_bin2bn(dh%d_p,sizeof(dh%d_p),NULL);\n",
 280                         bits,bits);
 281                 printf("\tdh->g=BN_bin2bn(dh%d_g,sizeof(dh%d_g),NULL);\n",
 282                         bits,bits);
 283                 printf("\tif ((dh->p == NULL) || (dh->g == NULL))\n");
 284                 printf("\t\treturn(NULL);\n");
 285                 printf("\treturn(dh);\n\t}\n");
 286                 }
 287
 288
 289         if (!noout)
 290                 {
 291                 if      (outformat == FORMAT_ASN1)
 292                         i=i2d_DHparams_bio(out,dh);
 293                 else if (outformat == FORMAT_PEM)
 294                         i=PEM_write_bio_DHparams(out,dh);
 295                 else    {
 296                         BIO_printf(bio_err,"bad output format specified for outfile\n");
 297                         goto end;
 298                         }
 299                 if (!i)
 300                         {
 301                         BIO_printf(bio_err,"unable to write DH paramaters\n");
 302                         ERR_print_errors(bio_err);
 303                         goto end;
 304                         }
 305                 }
 306         ret=0;
 307 end:
 308         if (in != NULL) BIO_free(in);
 309         if (out != NULL) BIO_free(out);
 310         if (dh != NULL) DH_free(dh);
 311         EXIT(ret);
 312         }