text: /* crypto/dh/dhtest.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 <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  
  #include "../e_os.h"
  
  #include <openssl/crypto.h>
  #include <openssl/bio.h>
  #include <openssl/bn.h>
  #include <openssl/rand.h>
  #include <openssl/err.h>
  
  #ifdef OPENSSL_NO_DH
  int main(int argc, char *argv[])
  {
      printf("No DH support\n");
      return(0);
  }
  #else
  #include <openssl/dh.h>
  
  #ifdef OPENSSL_SYS_WIN16
  #define MS_CALLBACK	_far _loadds
  #else
  #define MS_CALLBACK
  #endif
  
  static void MS_CALLBACK cb(int p, int n, void *arg);
  
  static const char rnd_seed[] = "string to make the random number generator think it has entropy";
  
  int main(int argc, char *argv[])
  	{
  	DH *a;
  	DH *b=NULL;
  	char buf[12];
  	unsigned char *abuf=NULL,*bbuf=NULL;
  	int i,alen,blen,aout,bout,ret=1;
  	BIO *out;
  
  	CRYPTO_malloc_debug_init();
  	CRYPTO_dbg_set_options(V_CRYPTO_MDEBUG_ALL);
  	CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
  
  #ifdef OPENSSL_SYS_WIN32
  	CRYPTO_malloc_init();
  #endif
  
  	RAND_seed(rnd_seed, sizeof rnd_seed);
  
  	out=BIO_new(BIO_s_file());
  	if (out == NULL) EXIT(1);
  	BIO_set_fp(out,stdout,BIO_NOCLOSE);
  
  	a=DH_generate_parameters(64,DH_GENERATOR_5,cb,out);
  	if (a == NULL) goto err;
  
  	if (!DH_check(a, &i)) goto err;
  	if (i & DH_CHECK_P_NOT_PRIME)
  		BIO_puts(out, "p value is not prime\n");
  	if (i & DH_CHECK_P_NOT_SAFE_PRIME)
  		BIO_puts(out, "p value is not a safe prime\n");
  	if (i & DH_UNABLE_TO_CHECK_GENERATOR)
  		BIO_puts(out, "unable to check the generator value\n");
  	if (i & DH_NOT_SUITABLE_GENERATOR)
  		BIO_puts(out, "the g value is not a generator\n");
  
  	BIO_puts(out,"\np    =");
  	BN_print(out,a->p);
  	BIO_puts(out,"\ng    =");
  	BN_print(out,a->g);
  	BIO_puts(out,"\n");
  
  	b=DH_new();
  	if (b == NULL) goto err;
  
  	b->p=BN_dup(a->p);
  	b->g=BN_dup(a->g);
  	if ((b->p == NULL) || (b->g == NULL)) goto err;
  
  	/* Set a to run with normal modexp and b to use constant time */
  	a->flags &= ~DH_FLAG_NO_EXP_CONSTTIME;
  	b->flags |= DH_FLAG_NO_EXP_CONSTTIME;
  
  	if (!DH_generate_key(a)) goto err;
  	BIO_puts(out,"pri 1=");
  	BN_print(out,a->priv_key);
  	BIO_puts(out,"\npub 1=");
  	BN_print(out,a->pub_key);
  	BIO_puts(out,"\n");
  
  	if (!DH_generate_key(b)) goto err;
  	BIO_puts(out,"pri 2=");
  	BN_print(out,b->priv_key);
  	BIO_puts(out,"\npub 2=");
  	BN_print(out,b->pub_key);
  	BIO_puts(out,"\n");
  
  	alen=DH_size(a);
  	abuf=(unsigned char *)OPENSSL_malloc(alen);
  	aout=DH_compute_key(abuf,b->pub_key,a);
  
  	BIO_puts(out,"key1 =");
  	for (i=0; i<aout; i++)
  		{
  		sprintf(buf,"%02X",abuf[i]);
  		BIO_puts(out,buf);
  		}
  	BIO_puts(out,"\n");
  
  	blen=DH_size(b);
  	bbuf=(unsigned char *)OPENSSL_malloc(blen);
  	bout=DH_compute_key(bbuf,a->pub_key,b);
  
  	BIO_puts(out,"key2 =");
  	for (i=0; i<bout; i++)
  		{
  		sprintf(buf,"%02X",bbuf[i]);
  		BIO_puts(out,buf);
  		}
  	BIO_puts(out,"\n");
  	if ((aout < 4) || (bout != aout) || (memcmp(abuf,bbuf,aout) != 0))
  		{
  		fprintf(stderr,"Error in DH routines\n");
  		ret=1;
  		}
  	else
  		ret=0;
  err:
  	ERR_print_errors_fp(stderr);
  
  	if (abuf != NULL) OPENSSL_free(abuf);
  	if (bbuf != NULL) OPENSSL_free(bbuf);
  	if(b != NULL) DH_free(b);
  	if(a != NULL) DH_free(a);
  	BIO_free(out);
  	CRYPTO_cleanup_all_ex_data();
  	ERR_remove_state(0);
  	CRYPTO_mem_leaks_fp(stderr);
  	EXIT(ret);
  	return(ret);
  	}
  
  static void MS_CALLBACK cb(int p, int n, void *arg)
  	{
  	char c='*';
  
  	if (p == 0) c='.';
  	if (p == 1) c='+';
  	if (p == 2) c='*';
  	if (p == 3) c='\n';
  	BIO_write((BIO *)arg,&c,1);
  	(void)BIO_flush((BIO *)arg);
  #ifdef LINT
  	p=n;
  #endif
  	}
  #endif
  