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dsaparam.c

/* apps/dsaparam.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_DSA */
/* Until the key-gen callbacks are modified to use newer prototypes, we allow
 * deprecated functions for openssl-internal code */
#ifdef OPENSSL_NO_DEPRECATED
#undef OPENSSL_NO_DEPRECATED
#endif

#ifndef OPENSSL_NO_DSA
#include <assert.h>
#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/dsa.h>
#include <openssl/x509.h>
#include <openssl/pem.h>

#undef PROG
#define PROG      dsaparam_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
 * -noout
 * -text
 * -C
 * -noout
 * -genkey
 *  #ifdef GENCB_TEST
 * -timebomb n  - interrupt keygen after <n> seconds
 *  #endif
 */

#ifdef GENCB_TEST

static int stop_keygen_flag = 0;

static void timebomb_sigalarm(int foo)
      {
      stop_keygen_flag = 1;
      }

#endif

static int MS_CALLBACK dsa_cb(int p, int n, BN_GENCB *cb);

int MAIN(int, char **);

int MAIN(int argc, char **argv)
      {
#ifndef OPENSSL_NO_ENGINE
      ENGINE *e = NULL;
#endif
      DSA *dsa=NULL;
      int i,badops=0,text=0;
      BIO *in=NULL,*out=NULL;
      int informat,outformat,noout=0,C=0,ret=1;
      char *infile,*outfile,*prog,*inrand=NULL;
      int numbits= -1,num,genkey=0;
      int need_rand=0;
#ifndef OPENSSL_NO_ENGINE
      char *engine=NULL;
#endif
#ifdef GENCB_TEST
      int timebomb=0;
#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;

      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
#ifdef GENCB_TEST
            else if(strcmp(*argv, "-timebomb") == 0)
                  {
                  if (--argc < 1) goto bad;
                  timebomb = atoi(*(++argv));
                  }
#endif
            else if (strcmp(*argv,"-text") == 0)
                  text=1;
            else if (strcmp(*argv,"-C") == 0)
                  C=1;
            else if (strcmp(*argv,"-genkey") == 0)
                  {
                  genkey=1;
                  need_rand=1;
                  }
            else if (strcmp(*argv,"-rand") == 0)
                  {
                  if (--argc < 1) goto bad;
                  inrand= *(++argv);
                  need_rand=1;
                  }
            else if (strcmp(*argv,"-noout") == 0)
                  noout=1;
            else if (sscanf(*argv,"%d",&num) == 1)
                  {
                  /* generate a key */
                  numbits=num;
                  need_rand=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] [bits] <infile >outfile\n",prog);
            BIO_printf(bio_err,"where options are\n");
            BIO_printf(bio_err," -inform arg   input format - DER or PEM\n");
            BIO_printf(bio_err," -outform arg  output format - DER or PEM\n");
            BIO_printf(bio_err," -in arg       input file\n");
            BIO_printf(bio_err," -out arg      output file\n");
            BIO_printf(bio_err," -text         print as text\n");
            BIO_printf(bio_err," -C            Output C code\n");
            BIO_printf(bio_err," -noout        no output\n");
            BIO_printf(bio_err," -genkey       generate a DSA key\n");
            BIO_printf(bio_err," -rand         files to use for random number input\n");
#ifndef OPENSSL_NO_ENGINE
            BIO_printf(bio_err," -engine e     use engine e, possibly a hardware device.\n");
#endif
#ifdef GENCB_TEST
            BIO_printf(bio_err," -timebomb n   interrupt keygen after <n> seconds\n");
#endif
            BIO_printf(bio_err," number        number of bits to use for generating private key\n");
            goto end;
            }

      ERR_load_crypto_strings();

      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;
                  }
            }

#ifndef OPENSSL_NO_ENGINE
        e = setup_engine(bio_err, engine, 0);
#endif

      if (need_rand)
            {
            app_RAND_load_file(NULL, bio_err, (inrand != NULL));
            if (inrand != NULL)
                  BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
                        app_RAND_load_files(inrand));
            }

      if (numbits > 0)
            {
            BN_GENCB cb;
            BN_GENCB_set(&cb, dsa_cb, bio_err);
            assert(need_rand);
            dsa = DSA_new();
            if(!dsa)
                  {
                  BIO_printf(bio_err,"Error allocating DSA object\n");
                  goto end;
                  }
            BIO_printf(bio_err,"Generating DSA parameters, %d bit long prime\n",num);
              BIO_printf(bio_err,"This could take some time\n");
#ifdef GENCB_TEST
            if(timebomb > 0)
      {
            struct sigaction act;
            act.sa_handler = timebomb_sigalarm;
            act.sa_flags = 0;
            BIO_printf(bio_err,"(though I'll stop it if not done within %d secs)\n",
                        timebomb);
            if(sigaction(SIGALRM, &act, NULL) != 0)
                  {
                  BIO_printf(bio_err,"Error, couldn't set SIGALRM handler\n");
                  goto end;
                  }
            alarm(timebomb);
      }
#endif
              if(!DSA_generate_parameters_ex(dsa,num,NULL,0,NULL,NULL, &cb))
                  {
#ifdef GENCB_TEST
                  if(stop_keygen_flag)
                        {
                        BIO_printf(bio_err,"DSA key generation time-stopped\n");
                        /* This is an asked-for behaviour! */
                        ret = 0;
                        goto end;
                        }
#endif
                  BIO_printf(bio_err,"Error, DSA key generation failed\n");
                  goto end;
                  }
            }
      else if     (informat == FORMAT_ASN1)
            dsa=d2i_DSAparams_bio(in,NULL);
      else if (informat == FORMAT_PEM)
            dsa=PEM_read_bio_DSAparams(in,NULL,NULL,NULL);
      else
            {
            BIO_printf(bio_err,"bad input format specified\n");
            goto end;
            }
      if (dsa == NULL)
            {
            BIO_printf(bio_err,"unable to load DSA parameters\n");
            ERR_print_errors(bio_err);
            goto end;
            }

      if (text)
            {
            DSAparams_print(out,dsa);
            }
      
      if (C)
            {
            unsigned char *data;
            int l,len,bits_p,bits_q,bits_g;

            len=BN_num_bytes(dsa->p);
            bits_p=BN_num_bits(dsa->p);
            bits_q=BN_num_bits(dsa->q);
            bits_g=BN_num_bits(dsa->g);
            data=(unsigned char *)OPENSSL_malloc(len+20);
            if (data == NULL)
                  {
                  perror("OPENSSL_malloc");
                  goto end;
                  }
            l=BN_bn2bin(dsa->p,data);
            printf("static unsigned char dsa%d_p[]={",bits_p);
            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(dsa->q,data);
            printf("static unsigned char dsa%d_q[]={",bits_p);
            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(dsa->g,data);
            printf("static unsigned char dsa%d_g[]={",bits_p);
            for (i=0; i<l; i++)
                  {
                  if ((i%12) == 0) printf("\n\t");
                  printf("0x%02X,",data[i]);
                  }
            printf("\n\t};\n\n");

            printf("DSA *get_dsa%d()\n\t{\n",bits_p);
            printf("\tDSA *dsa;\n\n");
            printf("\tif ((dsa=DSA_new()) == NULL) return(NULL);\n");
            printf("\tdsa->p=BN_bin2bn(dsa%d_p,sizeof(dsa%d_p),NULL);\n",
                  bits_p,bits_p);
            printf("\tdsa->q=BN_bin2bn(dsa%d_q,sizeof(dsa%d_q),NULL);\n",
                  bits_p,bits_p);
            printf("\tdsa->g=BN_bin2bn(dsa%d_g,sizeof(dsa%d_g),NULL);\n",
                  bits_p,bits_p);
            printf("\tif ((dsa->p == NULL) || (dsa->q == NULL) || (dsa->g == NULL))\n");
            printf("\t\t{ DSA_free(dsa); return(NULL); }\n");
            printf("\treturn(dsa);\n\t}\n");
            }


      if (!noout)
            {
            if    (outformat == FORMAT_ASN1)
                  i=i2d_DSAparams_bio(out,dsa);
            else if (outformat == FORMAT_PEM)
                  i=PEM_write_bio_DSAparams(out,dsa);
            else  {
                  BIO_printf(bio_err,"bad output format specified for outfile\n");
                  goto end;
                  }
            if (!i)
                  {
                  BIO_printf(bio_err,"unable to write DSA parameters\n");
                  ERR_print_errors(bio_err);
                  goto end;
                  }
            }
      if (genkey)
            {
            DSA *dsakey;

            assert(need_rand);
            if ((dsakey=DSAparams_dup(dsa)) == NULL) goto end;
            if (!DSA_generate_key(dsakey)) goto end;
            if    (outformat == FORMAT_ASN1)
                  i=i2d_DSAPrivateKey_bio(out,dsakey);
            else if (outformat == FORMAT_PEM)
                  i=PEM_write_bio_DSAPrivateKey(out,dsakey,NULL,NULL,0,NULL,NULL);
            else  {
                  BIO_printf(bio_err,"bad output format specified for outfile\n");
                  goto end;
                  }
            DSA_free(dsakey);
            }
      if (need_rand)
            app_RAND_write_file(NULL, bio_err);
      ret=0;
end:
      if (in != NULL) BIO_free(in);
      if (out != NULL) BIO_free_all(out);
      if (dsa != NULL) DSA_free(dsa);
      apps_shutdown();
      OPENSSL_EXIT(ret);
      }

static int MS_CALLBACK dsa_cb(int p, int n, BN_GENCB *cb)
      {
      char c='*';

      if (p == 0) c='.';
      if (p == 1) c='+';
      if (p == 2) c='*';
      if (p == 3) c='\n';
      BIO_write(cb->arg,&c,1);
      (void)BIO_flush(cb->arg);
#ifdef LINT
      p=n;
#endif
#ifdef GENCB_TEST
      if(stop_keygen_flag)
            return 0;
#endif
      return 1;
      }
#endif

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