int MAIN(int argc, char **argv)
	{
	int i,badops=0, ret = 1;
	BIO *in = NULL,*out = NULL, *key = NULL;
	int verify=0,noout=0,pubkey=0;
	char *infile = NULL,*outfile = NULL,*prog;
	char *spkac = "SPKAC", *spksect = "default", *spkstr = NULL;
	char *challenge = NULL, *keyfile = NULL;
	LHASH *conf = NULL;
	NETSCAPE_SPKI *spki = NULL;
	EVP_PKEY *pkey = NULL;

	apps_startup();

	if (!bio_err) bio_err = BIO_new_fp(stderr, BIO_NOCLOSE);

	prog=argv[0];
	argc--;
	argv++;
	while (argc >= 1)
		{
		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);
			}
		else if (strcmp(*argv,"-key") == 0)
			{
			if (--argc < 1) goto bad;
			keyfile= *(++argv);
			}
		else if (strcmp(*argv,"-challenge") == 0)
			{
			if (--argc < 1) goto bad;
			challenge= *(++argv);
			}
		else if (strcmp(*argv,"-spkac") == 0)
			{
			if (--argc < 1) goto bad;
			spkac= *(++argv);
			}
		else if (strcmp(*argv,"-spksect") == 0)
			{
			if (--argc < 1) goto bad;
			spksect= *(++argv);
			}
		else if (strcmp(*argv,"-noout") == 0)
			noout=1;
		else if (strcmp(*argv,"-pubkey") == 0)
			pubkey=1;
		else if (strcmp(*argv,"-verify") == 0)
			verify=1;
		else badops = 1;
		argc--;
		argv++;
		}

	if (badops)
		{
bad:
		BIO_printf(bio_err,"%s [options]\n",prog);
		BIO_printf(bio_err,"where options are\n");
		BIO_printf(bio_err," -in arg        input file\n");
		BIO_printf(bio_err," -out arg       output file\n");
		BIO_printf(bio_err," -key arg       create SPKAC using private key\n");
		BIO_printf(bio_err," -challenge arg challenge string\n");
		BIO_printf(bio_err," -spkac arg     alternative SPKAC name\n");
		BIO_printf(bio_err," -noout         don't print SPKAC\n");
		BIO_printf(bio_err," -pubkey        output public key\n");
		BIO_printf(bio_err," -verify        verify SPKAC signature\n");
		goto end;
		}

	ERR_load_crypto_strings();

	if(keyfile) {
		if(strcmp(keyfile, "-")) key = BIO_new_file(keyfile, "r");
		else key = BIO_new_fp(stdin, BIO_NOCLOSE);
		if(!key) {
			BIO_printf(bio_err, "Error opening key file\n");
			ERR_print_errors(bio_err);
			goto end;
		}
		pkey = PEM_read_bio_PrivateKey(key, NULL, NULL, NULL);
		if(!pkey) {
			BIO_printf(bio_err, "Error reading private key\n");
			ERR_print_errors(bio_err);
			goto end;
		}
		spki = NETSCAPE_SPKI_new();
		if(challenge) ASN1_STRING_set(spki->spkac->challenge,
						 challenge, strlen(challenge));
		NETSCAPE_SPKI_set_pubkey(spki, pkey);
		NETSCAPE_SPKI_sign(spki, pkey, EVP_md5());
		spkstr = NETSCAPE_SPKI_b64_encode(spki);

		if (outfile) out = BIO_new_file(outfile, "w");
		else out = BIO_new_fp(stdout, BIO_NOCLOSE);

		if(!out) {
			BIO_printf(bio_err, "Error opening output file\n");
			ERR_print_errors(bio_err);
			goto end;
		}
		BIO_printf(out, "SPKAC=%s\n", spkstr);
		Free(spkstr);
		ret = 0;
		goto end;
	}

	

	if (infile) in = BIO_new_file(infile, "r");
	else in = BIO_new_fp(stdin, BIO_NOCLOSE);

	if(!in) {
		BIO_printf(bio_err, "Error opening input file\n");
		ERR_print_errors(bio_err);
		goto end;
	}

	conf = CONF_load_bio(NULL, in, NULL);

	if(!conf) {
		BIO_printf(bio_err, "Error parsing config file\n");
		ERR_print_errors(bio_err);
		goto end;
	}

	spkstr = CONF_get_string(conf, spksect, spkac);
		
	if(!spkstr) {
		BIO_printf(bio_err, "Can't find SPKAC called \"%s\"\n", spkac);
		ERR_print_errors(bio_err);
		goto end;
	}

	spki = NETSCAPE_SPKI_b64_decode(spkstr, -1);
	
	if(!spki) {
		BIO_printf(bio_err, "Error loading SPKAC\n");
		ERR_print_errors(bio_err);
		goto end;
	}

	if (outfile) out = BIO_new_file(outfile, "w");
	else out = BIO_new_fp(stdout, BIO_NOCLOSE);

	if(!out) {
		BIO_printf(bio_err, "Error opening output file\n");
		ERR_print_errors(bio_err);
		goto end;
	}

	if(!noout) NETSCAPE_SPKI_print(out, spki);
	pkey = NETSCAPE_SPKI_get_pubkey(spki);
	if(verify) {
		i = NETSCAPE_SPKI_verify(spki, pkey);
		if(i) BIO_printf(bio_err, "Signature OK\n");
		else {
			BIO_printf(bio_err, "Signature Failure\n");
			ERR_print_errors(bio_err);
			goto end;
		}
	}
	if(pubkey) PEM_write_bio_PUBKEY(out, pkey);

	ret = 0;

end:
	CONF_free(conf);
	NETSCAPE_SPKI_free(spki);
	BIO_free(in);
	BIO_free(out);
	BIO_free(key);
	EVP_PKEY_free(pkey);
	EXIT(ret);
	}