text: /* apps/dh.c */
  /* obsoleted by dhparam.c */
  /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   * All rights reserved.
   *
   * This package is an SSL implementation written
   * by Eric Young (eay@cryptsoft.com).
   * The implementation was written so as to conform with Netscapes SSL.
   *
   * This library is free for commercial and non-commercial use as long as
   * the following conditions are aheared to.  The following conditions
   * apply to all code found in this distribution, be it the RC4, RSA,
   * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
   * included with this distribution is covered by the same copyright terms
   * except that the holder is Tim Hudson (tjh@cryptsoft.com).
   *
   * Copyright remains Eric Young's, and as such any Copyright notices in
   * the code are not to be removed.
   * If this package is used in a product, Eric Young should be given attribution
   * as the author of the parts of the library used.
   * This can be in the form of a textual message at program startup or
   * in documentation (online or textual) provided with the package.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *    "This product includes cryptographic software written by
   *     Eric Young (eay@cryptsoft.com)"
   *    The word 'cryptographic' can be left out if the rouines from the library
   *    being used are not cryptographic related :-).
   * 4. If you include any Windows specific code (or a derivative thereof) from
   *    the apps directory (application code) you must include an acknowledgement:
   *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
   *
   * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   * The licence and distribution terms for any publically available version or
   * derivative of this code cannot be changed.  i.e. this code cannot simply be
   * copied and put under another distribution licence
   * [including the GNU Public Licence.]
   */
  
  #include <openssl/opensslconf.h> /* for OPENSSL_NO_DH */
  #ifndef OPENSSL_NO_DH
  # include <stdio.h>
  # include <stdlib.h>
  # include <time.h>
  # include <string.h>
  # include "apps.h"
  # include <openssl/bio.h>
  # include <openssl/err.h>
  # include <openssl/bn.h>
  # include <openssl/dh.h>
  # include <openssl/x509.h>
  # include <openssl/pem.h>
  
  # undef PROG
  # define PROG    dh_main
  
  /*-
   * -inform arg  - input format - default PEM (DER or PEM)
   * -outform arg - output format - default PEM
   * -in arg      - input file - default stdin
   * -out arg     - output file - default stdout
   * -check       - check the parameters are ok
   * -noout
   * -text
   * -C
   */
  
  int MAIN(int, char **);
  
  int MAIN(int argc, char **argv)
  {
      DH *dh = NULL;
      int i, badops = 0, text = 0;
      BIO *in = NULL, *out = NULL;
      int informat, outformat, check = 0, noout = 0, C = 0, ret = 1;
      char *infile, *outfile, *prog;
  # ifndef OPENSSL_NO_ENGINE
      char *engine;
  # endif
  
      apps_startup();
  
      if (bio_err == NULL)
          if ((bio_err = BIO_new(BIO_s_file())) != NULL)
              BIO_set_fp(bio_err, stderr, BIO_NOCLOSE | BIO_FP_TEXT);
  
      if (!load_config(bio_err, NULL))
          goto end;
  
  # ifndef OPENSSL_NO_ENGINE
      engine = NULL;
  # endif
      infile = NULL;
      outfile = NULL;
      informat = FORMAT_PEM;
      outformat = FORMAT_PEM;
  
      prog = argv[0];
      argc--;
      argv++;
      while (argc >= 1) {
          if (strcmp(*argv, "-inform") == 0) {
              if (--argc < 1)
                  goto bad;
              informat = str2fmt(*(++argv));
          } else if (strcmp(*argv, "-outform") == 0) {
              if (--argc < 1)
                  goto bad;
              outformat = str2fmt(*(++argv));
          } else if (strcmp(*argv, "-in") == 0) {
              if (--argc < 1)
                  goto bad;
              infile = *(++argv);
          } else if (strcmp(*argv, "-out") == 0) {
              if (--argc < 1)
                  goto bad;
              outfile = *(++argv);
          }
  # ifndef OPENSSL_NO_ENGINE
          else if (strcmp(*argv, "-engine") == 0) {
              if (--argc < 1)
                  goto bad;
              engine = *(++argv);
          }
  # endif
          else if (strcmp(*argv, "-check") == 0)
              check = 1;
          else if (strcmp(*argv, "-text") == 0)
              text = 1;
          else if (strcmp(*argv, "-C") == 0)
              C = 1;
          else if (strcmp(*argv, "-noout") == 0)
              noout = 1;
          else {
              BIO_printf(bio_err, "unknown option %s\n", *argv);
              badops = 1;
              break;
          }
          argc--;
          argv++;
      }
  
      if (badops) {
   bad:
          BIO_printf(bio_err, "%s [options] <infile >outfile\n", prog);
          BIO_printf(bio_err, "where options are\n");
          BIO_printf(bio_err, " -inform arg   input format - one of DER PEM\n");
          BIO_printf(bio_err,
                     " -outform arg  output format - one of DER PEM\n");
          BIO_printf(bio_err, " -in arg       input file\n");
          BIO_printf(bio_err, " -out arg      output file\n");
          BIO_printf(bio_err, " -check        check the DH parameters\n");
          BIO_printf(bio_err,
                     " -text         print a text form of the DH parameters\n");
          BIO_printf(bio_err, " -C            Output C code\n");
          BIO_printf(bio_err, " -noout        no output\n");
  # ifndef OPENSSL_NO_ENGINE
          BIO_printf(bio_err,
                     " -engine e     use engine e, possibly a hardware device.\n");
  # endif
          goto end;
      }
  
      ERR_load_crypto_strings();
  
  # ifndef OPENSSL_NO_ENGINE
      setup_engine(bio_err, engine, 0);
  # endif
  
      in = BIO_new(BIO_s_file());
      out = BIO_new(BIO_s_file());
      if ((in == NULL) || (out == NULL)) {
          ERR_print_errors(bio_err);
          goto end;
      }
  
      if (infile == NULL)
          BIO_set_fp(in, stdin, BIO_NOCLOSE);
      else {
          if (BIO_read_filename(in, infile) <= 0) {
              perror(infile);
              goto end;
          }
      }
      if (outfile == NULL) {
          BIO_set_fp(out, stdout, BIO_NOCLOSE);
  # ifdef OPENSSL_SYS_VMS
          {
              BIO *tmpbio = BIO_new(BIO_f_linebuffer());
              out = BIO_push(tmpbio, out);
          }
  # endif
      } else {
          if (BIO_write_filename(out, outfile) <= 0) {
              perror(outfile);
              goto end;
          }
      }
  
      if (informat == FORMAT_ASN1)
          dh = d2i_DHparams_bio(in, NULL);
      else if (informat == FORMAT_PEM)
          dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
      else {
          BIO_printf(bio_err, "bad input format specified\n");
          goto end;
      }
      if (dh == NULL) {
          BIO_printf(bio_err, "unable to load DH parameters\n");
          ERR_print_errors(bio_err);
          goto end;
      }
  
      if (text) {
          DHparams_print(out, dh);
      }
  
      if (check) {
          if (!DH_check(dh, &i)) {
              ERR_print_errors(bio_err);
              goto end;
          }
          if (i & DH_CHECK_P_NOT_PRIME)
              printf("p value is not prime\n");
          if (i & DH_CHECK_P_NOT_SAFE_PRIME)
              printf("p value is not a safe prime\n");
          if (i & DH_UNABLE_TO_CHECK_GENERATOR)
              printf("unable to check the generator value\n");
          if (i & DH_NOT_SUITABLE_GENERATOR)
              printf("the g value is not a generator\n");
          if (i == 0)
              printf("DH parameters appear to be ok.\n");
      }
      if (C) {
          unsigned char *data;
          int len, l, bits;
  
          len = BN_num_bytes(dh->p);
          bits = BN_num_bits(dh->p);
          data = (unsigned char *)OPENSSL_malloc(len);
          if (data == NULL) {
              perror("OPENSSL_malloc");
              goto end;
          }
          l = BN_bn2bin(dh->p, data);
          printf("static unsigned char dh%d_p[]={", bits);
          for (i = 0; i < l; i++) {
              if ((i % 12) == 0)
                  printf("\n\t");
              printf("0x%02X,", data[i]);
          }
          printf("\n\t};\n");
  
          l = BN_bn2bin(dh->g, data);
          printf("static unsigned char dh%d_g[]={", bits);
          for (i = 0; i < l; i++) {
              if ((i % 12) == 0)
                  printf("\n\t");
              printf("0x%02X,", data[i]);
          }
          printf("\n\t};\n\n");
  
          printf("DH *get_dh%d()\n\t{\n", bits);
          printf("\tDH *dh;\n\n");
          printf("\tif ((dh=DH_new()) == NULL) return(NULL);\n");
          printf("\tdh->p=BN_bin2bn(dh%d_p,sizeof(dh%d_p),NULL);\n",
                 bits, bits);
          printf("\tdh->g=BN_bin2bn(dh%d_g,sizeof(dh%d_g),NULL);\n",
                 bits, bits);
          printf("\tif ((dh->p == NULL) || (dh->g == NULL))\n");
          printf("\t\treturn(NULL);\n");
          printf("\treturn(dh);\n\t}\n");
          OPENSSL_free(data);
      }
  
      if (!noout) {
          if (outformat == FORMAT_ASN1)
              i = i2d_DHparams_bio(out, dh);
          else if (outformat == FORMAT_PEM)
              i = PEM_write_bio_DHparams(out, dh);
          else {
              BIO_printf(bio_err, "bad output format specified for outfile\n");
              goto end;
          }
          if (!i) {
              BIO_printf(bio_err, "unable to write DH parameters\n");
              ERR_print_errors(bio_err);
              goto end;
          }
      }
      ret = 0;
   end:
      if (in != NULL)
          BIO_free(in);
      if (out != NULL)
          BIO_free_all(out);
      if (dh != NULL)
          DH_free(dh);
      apps_shutdown();
      OPENSSL_EXIT(ret);
  }
  #else                           /* !OPENSSL_NO_DH */
  
  # if PEDANTIC
  static void *dummy = &dummy;
  # endif
  
  #endif
  