a->flags &= ~DH_FLAG_NO_EXP_CONSTTIME; b->flags |= DH_FLAG_NO_EXP_CONSTTIME;
int main(int argc, char *argv[])	{	BN_GENCB _cb;	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);	BN_GENCB_set(&_cb, &cb, out);	if(((a = DH_new()) == NULL) || !DH_generate_parameters_ex(a, 64,				DH_GENERATOR_5, &_cb))		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;	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);#ifdef OPENSSL_SYS_NETWARE    if (ret) printf("ERROR: %d\n", ret);#endif	EXIT(ret);	return(ret);	}