/*

 * Copyright (C) 2017 Red Hat, Inc.

 *

 * Author: Nikos Mavrogiannopoulos

 *

 * This file is part of GnuTLS.

 *

 * GnuTLS is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 3 of the License, or

 * (at your option) any later version.

 *

 * GnuTLS is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with this program.  If not, see <https://www.gnu.org/licenses/>

 */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <assert.h>

#include <unistd.h>

#include <gnutls/gnutls.h>

#include <gnutls/x509.h>

#include <gnutls/abstract.h>

#include "../utils.h"

#include "softhsm.h"

#define CONFIG_NAME "softhsm-privkey-rsa-pss-test"

#define CONFIG CONFIG_NAME".config"

/* Tests whether signing with PKCS#11 and RSA-PSS would

 * generate valid signatures */

#include "../cert-common.h"

#define PIN "1234"

static const gnutls_datum_t testdata = { (void *)"test test", 9 };

static void tls_log_func(int level, const char *str)

{

	fprintf(stderr, "|<%d>| %s", level, str);

}

static

int pin_func(void *userdata, int attempt, const char *url, const char *label,

	     unsigned flags, char *pin, size_t pin_max)

{

	if (attempt == 0) {

		strcpy(pin, PIN);

		return 0;

	}

	return -1;

}

#define myfail(fmt, ...) \

	fail("%s (iter %d): "fmt, gnutls_sign_get_name(sigalgo), i, ##__VA_ARGS__)

static unsigned verify_rsa_pss_presence(void)

{

	unsigned i;

	unsigned long mechanism;

	int ret;

	i = 0;

	do {

		ret = gnutls_pkcs11_token_get_mechanism("pkcs11:", i++, &mechanism);

		if (ret >= 0 && mechanism == 0xd /* CKM_RSA_PKCS_PSS*/)

			return 1;

	} while(ret>=0);

	return 0;

}

void doit(void)

{

	char buf[128];

	int ret;

	const char *lib, *bin;

	gnutls_x509_crt_t crt;

	gnutls_x509_privkey_t key;

	gnutls_datum_t tmp, sig;

	gnutls_privkey_t pkey;

	gnutls_pubkey_t pubkey;

	gnutls_pubkey_t pubkey2;

	unsigned i, sigalgo;

	bin = softhsm_bin();

	lib = softhsm_lib();

	ret = global_init();

	if (ret != 0) {

		fail("%d: %s\n", ret, gnutls_strerror(ret));

		exit(1);

	}

	gnutls_pkcs11_set_pin_function(pin_func, NULL);

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(4711);

	set_softhsm_conf(CONFIG);

	snprintf(buf, sizeof(buf),

		 "%s --init-token --slot 0 --label test --so-pin " PIN " --pin "

		 PIN, bin);

	system(buf);

	ret = gnutls_pkcs11_add_provider(lib, NULL);

	if (ret < 0) {

		fprintf(stderr, "gnutls_x509_crt_init: %s\n",

			gnutls_strerror(ret));

		exit(1);

	}

	if (verify_rsa_pss_presence() == 0) {

		fprintf(stderr, "Skipping test as no RSA-PSS mech is supported\n");

		exit(77);

	}

	ret = gnutls_x509_crt_init(&crt;;

	if (ret < 0) {

		fprintf(stderr,

			"gnutls_x509_crt_init: %s\n", gnutls_strerror(ret));

		exit(1);

	}

	ret =

	    gnutls_x509_crt_import(crt, &cli_ca3_rsa_pss_cert,

				   GNUTLS_X509_FMT_PEM);

	if (ret < 0) {

		fprintf(stderr,

			"gnutls_x509_crt_import: %s\n", gnutls_strerror(ret));

		exit(1);

	}

	if (debug) {

		gnutls_x509_crt_print(crt, GNUTLS_CRT_PRINT_ONELINE, &tmp);

		printf("\tCertificate: %.*s\n", tmp.size, tmp.data);

		gnutls_free(tmp.data);

	}

	ret = gnutls_x509_privkey_init(&key);

	if (ret < 0) {

		fprintf(stderr,

			"gnutls_x509_privkey_init: %s\n", gnutls_strerror(ret));

		exit(1);

	}

	ret =

	    gnutls_x509_privkey_import(key, &cli_ca3_rsa_pss_key,

				       GNUTLS_X509_FMT_PEM);

	if (ret < 0) {

		fprintf(stderr,

			"gnutls_x509_privkey_import: %s\n",

			gnutls_strerror(ret));

		exit(1);

	}

	/* initialize softhsm token */

	ret = gnutls_pkcs11_token_init(SOFTHSM_URL, PIN, "test");

	if (ret < 0) {

		fail("gnutls_pkcs11_token_init: %s\n", gnutls_strerror(ret));

		exit(1);

	}

	ret =

	    gnutls_pkcs11_token_set_pin(SOFTHSM_URL, NULL, PIN,

					GNUTLS_PIN_USER);

	if (ret < 0) {

		fail("gnutls_pkcs11_token_set_pin: %s\n", gnutls_strerror(ret));

		exit(1);

	}

	ret = gnutls_pkcs11_copy_x509_crt(SOFTHSM_URL, crt, "cert",

					  GNUTLS_PKCS11_OBJ_FLAG_MARK_PRIVATE |

					  GNUTLS_PKCS11_OBJ_FLAG_LOGIN);

	if (ret < 0) {

		fail("gnutls_pkcs11_copy_x509_crt: %s\n", gnutls_strerror(ret));

		exit(1);

	}

	ret =

	    gnutls_pkcs11_copy_x509_privkey(SOFTHSM_URL, key, "cert",

					    GNUTLS_KEY_DIGITAL_SIGNATURE |

					    GNUTLS_KEY_KEY_ENCIPHERMENT,

					    GNUTLS_PKCS11_OBJ_FLAG_MARK_PRIVATE

					    |

					    GNUTLS_PKCS11_OBJ_FLAG_MARK_SENSITIVE

					    | GNUTLS_PKCS11_OBJ_FLAG_LOGIN);

	if (ret < 0) {

		fail("gnutls_pkcs11_copy_x509_privkey: %s\n",

		     gnutls_strerror(ret));

		exit(1);

	}

	gnutls_x509_crt_deinit(crt);

	gnutls_x509_privkey_deinit(key);

	gnutls_pkcs11_set_pin_function(NULL, NULL);

	assert(gnutls_privkey_init(&pkey) == 0);

	ret =

	    gnutls_privkey_import_pkcs11_url(pkey,

					     SOFTHSM_URL

					     ";object=cert;object-type=private;pin-value="

					     PIN);

	if (ret < 0) {

		fprintf(stderr, "error in %d: %s\n", __LINE__,

			gnutls_strerror(ret));

		exit(1);

	}

	assert(gnutls_pubkey_init(&pubkey) == 0);

	assert(gnutls_pubkey_import_privkey(pubkey, pkey, 0, 0) == 0);

	assert(gnutls_pubkey_init(&pubkey2) == 0);

	assert(gnutls_pubkey_import_x509_raw

	       (pubkey2, &cli_ca3_rsa_pss_cert, GNUTLS_X509_FMT_PEM, 0) == 0);

	/* this is the algorithm supported by the certificate */

	sigalgo = GNUTLS_SIGN_RSA_PSS_SHA256;

	for (i = 0; i < 20; i++) {

		/* check whether privkey and pubkey are operational

		 * by signing and verifying */

		ret =

		    gnutls_privkey_sign_data2(pkey, sigalgo, 0,

					      &testdata, &sig);

		if (ret < 0)

			myfail("Error signing data %s\n", gnutls_strerror(ret));

		/* verify against the pubkey in PKCS #11 */

		ret =

		    gnutls_pubkey_verify_data2(pubkey, sigalgo, 0,

					       &testdata, &sig);

		if (ret < 0)

			myfail("Error verifying data1: %s\n",

			       gnutls_strerror(ret));

		/* verify against the raw pubkey */

		ret =

		    gnutls_pubkey_verify_data2(pubkey2, sigalgo, 0,

					       &testdata, &sig);

		if (ret < 0)

			myfail("Error verifying data2: %s\n",

			       gnutls_strerror(ret));

		gnutls_free(sig.data);

	}

	gnutls_pubkey_deinit(pubkey2);

	gnutls_pubkey_deinit(pubkey);

	gnutls_privkey_deinit(pkey);

	gnutls_global_deinit();

	remove(CONFIG);

}