int MAIN(int argc, char **argv)
	{
	int i,badops=0;
	BIO *in=NULL,*out=NULL;
	int informat,outformat;
	char *infile,*outfile,*prog,*certfile;
	PKCS7 *p7 = NULL;
	PKCS7_SIGNED *p7s = NULL;
	X509_CRL *crl=NULL;
	STACK *certflst=NULL;
	STACK_OF(X509_CRL) *crl_stack=NULL;
	STACK_OF(X509) *cert_stack=NULL;
	int ret=1,nocrl=0;

	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);

	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,"-nocrl") == 0)
			{
			nocrl=1;
			}
		else if (strcmp(*argv,"-out") == 0)
			{
			if (--argc < 1) goto bad;
			outfile= *(++argv);
			}
		else if (strcmp(*argv,"-certfile") == 0)
			{
			if (--argc < 1) goto bad;
			if(!certflst) certflst = sk_new_null();
			sk_push(certflst,*(++argv));
			}
		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 - 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," -certfile arg  certificates file of chain to a trusted CA\n");
		BIO_printf(bio_err,"                (can be used more than once)\n");
		BIO_printf(bio_err," -nocrl         no crl to load, just certs from '-certfile'\n");
		EXIT(1);
		}

	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 (!nocrl)
		{
		if (infile == NULL)
			BIO_set_fp(in,stdin,BIO_NOCLOSE);
		else
			{
			if (BIO_read_filename(in,infile) <= 0)
				{
				perror(infile);
				goto end;
				}
			}

		if 	(informat == FORMAT_ASN1)
			crl=d2i_X509_CRL_bio(in,NULL);
		else if (informat == FORMAT_PEM)
			crl=PEM_read_bio_X509_CRL(in,NULL,NULL,NULL);
		else	{
			BIO_printf(bio_err,"bad input format specified for input crl\n");
			goto end;
			}
		if (crl == NULL)
			{
			BIO_printf(bio_err,"unable to load CRL\n");
			ERR_print_errors(bio_err);
			goto end;
			}
		}
	
	if ((p7=PKCS7_new()) == NULL) goto end;
	if ((p7s=PKCS7_SIGNED_new()) == NULL) goto end;
	p7->type=OBJ_nid2obj(NID_pkcs7_signed);
	p7->d.sign=p7s;
	p7s->contents->type=OBJ_nid2obj(NID_pkcs7_data);

	if (!ASN1_INTEGER_set(p7s->version,1)) goto end;
	if ((crl_stack=sk_X509_CRL_new_null()) == NULL) goto end;
	p7s->crl=crl_stack;
	if (crl != NULL)
		{
		sk_X509_CRL_push(crl_stack,crl);
		crl=NULL; /* now part of p7 for OPENSSL_freeing */
		}

	if ((cert_stack=sk_X509_new_null()) == NULL) goto end;
	p7s->cert=cert_stack;

	if(certflst) for(i = 0; i < sk_num(certflst); i++) {
		certfile = sk_value(certflst, i);
		if (add_certs_from_file(cert_stack,certfile) < 0)
			{
			BIO_printf(bio_err, "error loading certificates\n");
			ERR_print_errors(bio_err);
			goto end;
			}
	}

	sk_free(certflst);

	if (outfile == NULL)
		{
		BIO_set_fp(out,stdout,BIO_NOCLOSE);
#ifdef 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 	(outformat == FORMAT_ASN1)
		i=i2d_PKCS7_bio(out,p7);
	else if (outformat == FORMAT_PEM)
		i=PEM_write_bio_PKCS7(out,p7);
	else	{
		BIO_printf(bio_err,"bad output format specified for outfile\n");
		goto end;
		}
	if (!i)
		{
		BIO_printf(bio_err,"unable to write pkcs7 object\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 (p7 != NULL) PKCS7_free(p7);
	if (crl != NULL) X509_CRL_free(crl);

	EXIT(ret);
	}