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