DH *a,*b;
DH *a; DH *b=NULL;
int main(int argc, char *argv[])	{	DH *a,*b;	char buf[12];	unsigned char *abuf=NULL,*bbuf=NULL;	int i,alen,blen,aout,bout,ret=1;	BIO *out;#ifdef WIN32	CRYPTO_malloc_init();#endif	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;	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 *)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 *)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:	if (abuf != NULL) Free(abuf);	if (bbuf != NULL) Free(bbuf);	if(b != NULL) DH_free(b);	if(a != NULL) DH_free(a);	BIO_free(out);	exit(ret);	return(ret);	}