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/*
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* Copyright (C) 2017 Red Hat, Inc.
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*
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* Author: Nikos Mavrogiannopoulos
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*
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* This file is part of GnuTLS.
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*
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* GnuTLS is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuTLS is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <gnutls/gnutls.h>
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#include <gnutls/x509.h>
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#include <gnutls/abstract.h>
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#include <assert.h>
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#include "utils.h"
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/* This tests the key conversion from basic RSA to RSA-PSS.
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*/
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static void tls_log_func(int level, const char *str)
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{
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fprintf(stderr, "<%d>| %s", level, str);
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}
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const gnutls_datum_t raw_data = {
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(void *) "hello there",
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11
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};
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static void inv_sign_check(unsigned sigalgo,
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gnutls_privkey_t privkey, int exp_error)
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{
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int ret;
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gnutls_datum_t signature;
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ret = gnutls_privkey_sign_data2(privkey, sigalgo, 0,
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&raw_data, &signature);
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if (ret != exp_error)
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fail("gnutls_privkey_sign_data succeeded with %s and %s: %s\n", gnutls_pk_get_name(gnutls_privkey_get_pk_algorithm(privkey, NULL)),
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gnutls_sign_get_name(sigalgo), gnutls_strerror(ret));
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if (ret == 0)
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gnutls_free(signature.data);
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}
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static void inv_encryption_check(gnutls_pk_algorithm_t algorithm,
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gnutls_privkey_t privkey, int exp_error)
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{
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int ret;
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gnutls_datum_t ct;
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gnutls_pubkey_t pubkey;
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assert(gnutls_pubkey_init(&pubkey) >= 0);
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ret = gnutls_pubkey_import_privkey(pubkey, privkey, 0, 0);
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if (ret < 0)
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fail("gnutls_pubkey_import_privkey\n");
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ret = gnutls_pubkey_encrypt_data(pubkey, 0, &raw_data, &ct);
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if (ret != exp_error)
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fail("gnutls_pubkey_encrypt_data succeeded with %s: %s\n", gnutls_pk_get_name(algorithm),
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gnutls_strerror(ret));
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gnutls_pubkey_deinit(pubkey);
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}
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static void sign_verify_data(unsigned sigalgo, gnutls_privkey_t privkey)
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{
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int ret;
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gnutls_pubkey_t pubkey;
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gnutls_datum_t signature;
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ret = gnutls_privkey_sign_data2(privkey, sigalgo, 0,
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&raw_data, &signature);
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if (ret < 0)
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fail("gnutls_x509_privkey_sign_data\n");
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/* verify data */
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assert(gnutls_pubkey_init(&pubkey) >= 0);
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ret = gnutls_pubkey_import_privkey(pubkey, privkey, 0, 0);
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if (ret < 0)
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fail("gnutls_pubkey_import_privkey\n");
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ret = gnutls_pubkey_verify_data2(pubkey, sigalgo,
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0, &raw_data, &signature);
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if (ret < 0)
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fail("gnutls_pubkey_verify_data2\n");
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gnutls_pubkey_deinit(pubkey);
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gnutls_free(signature.data);
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}
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void doit(void)
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{
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gnutls_privkey_t pkey_rsa_pss;
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gnutls_privkey_t pkey_rsa;
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gnutls_x509_privkey_t tkey;
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int ret;
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gnutls_x509_spki_t spki;
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gnutls_datum_t tmp;
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ret = global_init();
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if (ret < 0)
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fail("global_init: %d\n", ret);
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gnutls_global_set_log_function(tls_log_func);
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if (debug)
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gnutls_global_set_log_level(4711);
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assert(gnutls_x509_spki_init(&spki)>=0);
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assert(gnutls_privkey_init(&pkey_rsa) >=0);
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gnutls_x509_spki_set_rsa_pss_params(spki, GNUTLS_DIG_SHA256, 32);
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ret =
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gnutls_privkey_generate(pkey_rsa, GNUTLS_PK_RSA, 2048, 0);
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if (ret < 0) {
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fail("gnutls_privkey_generate: %s\n", gnutls_strerror(ret));
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}
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assert(gnutls_privkey_set_spki(pkey_rsa, spki, 0)>=0);
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assert(gnutls_privkey_export_x509(pkey_rsa, &tkey) >=0);
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gnutls_x509_privkey_export2_pkcs8(tkey, GNUTLS_X509_FMT_PEM, NULL, 0, &tmp);
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/* import RSA-PSS version of key */
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assert(gnutls_privkey_init(&pkey_rsa_pss) >=0);
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assert(gnutls_privkey_import_x509_raw(pkey_rsa_pss, &tmp, GNUTLS_X509_FMT_PEM, NULL, 0) >= 0);
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gnutls_free(tmp.data);
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/* import RSA-PSS version of key */
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gnutls_privkey_deinit(pkey_rsa);
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gnutls_x509_privkey_export2(tkey, GNUTLS_X509_FMT_PEM, &tmp);
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assert(gnutls_privkey_init(&pkey_rsa) >=0);
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assert(gnutls_privkey_import_x509_raw(pkey_rsa, &tmp, GNUTLS_X509_FMT_PEM, NULL, 0) >= 0);
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gnutls_x509_privkey_deinit(tkey);
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gnutls_free(tmp.data);
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sign_verify_data(GNUTLS_SIGN_RSA_PSS_SHA256, pkey_rsa_pss);
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sign_verify_data(GNUTLS_SIGN_RSA_PSS_RSAE_SHA256, pkey_rsa);
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sign_verify_data(GNUTLS_SIGN_RSA_PSS_SHA256, pkey_rsa);
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if (debug)
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success("success signing with RSA-PSS-SHA256\n");
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/* check whether the RSA-PSS key restrictions are being followed */
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inv_encryption_check(GNUTLS_PK_RSA_PSS, pkey_rsa_pss, GNUTLS_E_INVALID_REQUEST);
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inv_sign_check(GNUTLS_SIGN_RSA_SHA512, pkey_rsa_pss, GNUTLS_E_CONSTRAINT_ERROR);
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inv_sign_check(GNUTLS_SIGN_RSA_SHA256, pkey_rsa_pss, GNUTLS_E_CONSTRAINT_ERROR);
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inv_sign_check(GNUTLS_SIGN_RSA_PSS_SHA384, pkey_rsa_pss, GNUTLS_E_CONSTRAINT_ERROR);
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inv_sign_check(GNUTLS_SIGN_RSA_PSS_SHA512, pkey_rsa_pss, GNUTLS_E_CONSTRAINT_ERROR);
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inv_sign_check(GNUTLS_SIGN_RSA_PSS_RSAE_SHA384, pkey_rsa_pss, GNUTLS_E_CONSTRAINT_ERROR);
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inv_sign_check(GNUTLS_SIGN_RSA_PSS_RSAE_SHA512, pkey_rsa_pss, GNUTLS_E_CONSTRAINT_ERROR);
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/* check whether the RSA key is not being restricted */
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inv_sign_check(GNUTLS_SIGN_RSA_SHA512, pkey_rsa, 0);
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inv_sign_check(GNUTLS_SIGN_RSA_SHA256, pkey_rsa, 0);
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inv_sign_check(GNUTLS_SIGN_RSA_PSS_RSAE_SHA384, pkey_rsa, 0);
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inv_sign_check(GNUTLS_SIGN_RSA_PSS_RSAE_SHA512, pkey_rsa, 0);
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/* an RSA key can also generate "pure" for TLS RSA-PSS signatures
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* as they are essentially the same thing, and we cannot always
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* know whether a key is RSA-PSS only, or not (e.g., in PKCS#11
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* keys). */
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inv_sign_check(GNUTLS_SIGN_RSA_PSS_SHA384, pkey_rsa, 0);
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inv_sign_check(GNUTLS_SIGN_RSA_PSS_SHA512, pkey_rsa, 0);
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gnutls_privkey_deinit(pkey_rsa);
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gnutls_privkey_deinit(pkey_rsa_pss);
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gnutls_x509_spki_deinit(spki);
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gnutls_global_deinit();
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}
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