#!/usr/bin/env perl

# depends-pkalgs.pl
#
# Copyright The Mbed TLS Contributors
# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
#
# This file is provided under the Apache License 2.0, or the
# GNU General Public License v2.0 or later.
#
# **********
# Apache License 2.0:
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# **********
#
# **********
# GNU General Public License v2.0 or later:
#
# This program 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 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# **********
#
# Purpose
#
# To test the code dependencies on individual PK algs (those that can be used
# from the PK layer, so currently signature and encryption but not key
# exchange) in each test suite. This is a verification step to ensure we don't
# ship test suites that do not work for some build options.
#
# The process is:
#       for each possible PK alg
#           build the library and test suites with that alg disabled
#           execute the test suites
#
# And any test suite with the wrong dependencies will fail.
#
# Usage: tests/scripts/depends-pkalgs.pl
#
# This script should be executed from the root of the project directory.
#
# For best effect, run either with cmake disabled, or cmake enabled in a mode
# that includes -Werror.

use warnings;
use strict;

-d 'library' && -d 'include' && -d 'tests' or die "Must be run from root\n";

my $config_h = 'include/mbedtls/config.h';

# Some algorithms can't be disabled on their own as others depend on them, so
# we list those reverse-dependencies here to keep check_config.h happy.
my %algs = (
    'MBEDTLS_ECDSA_C'   => ['MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED'],
    'MBEDTLS_ECP_C'     => ['MBEDTLS_ECDSA_C',
                            'MBEDTLS_ECDH_C',
                            'MBEDTLS_ECJPAKE_C',
                            'MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED',
                            'MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED',
                            'MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED',
                            'MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED',
                            'MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED'],
    'MBEDTLS_X509_RSASSA_PSS_SUPPORT'   => [],
    'MBEDTLS_PKCS1_V21' => ['MBEDTLS_X509_RSASSA_PSS_SUPPORT'],
    'MBEDTLS_PKCS1_V15' => ['MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED',
                            'MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED',
                            'MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED',
                            'MBEDTLS_KEY_EXCHANGE_RSA_ENABLED'],
    'MBEDTLS_RSA_C'     => ['MBEDTLS_X509_RSASSA_PSS_SUPPORT',
                            'MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED',
                            'MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED',
                            'MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED',
                            'MBEDTLS_KEY_EXCHANGE_RSA_ENABLED'],
);

system( "cp $config_h $config_h.bak" ) and die;
sub abort {
    system( "mv $config_h.bak $config_h" ) and warn "$config_h not restored\n";
    # use an exit code between 1 and 124 for git bisect (die returns 255)
    warn $_[0];
    exit 1;
}

while( my ($alg, $extras) = each %algs ) {
    system( "cp $config_h.bak $config_h" ) and die "$config_h not restored\n";
    system( "make clean" ) and die;

    print "\n******************************************\n";
    print "* Testing without alg: $alg\n";
    print "******************************************\n";

    system( "scripts/config.pl unset $alg" )
        and abort "Failed to disable $alg\n";
    for my $opt (@$extras) {
        system( "scripts/config.pl unset $opt" )
            and abort "Failed to disable $opt\n";
    }

    system( "CFLAGS='-Werror -Wall -Wextra' make lib" )
        and abort "Failed to build lib: $alg\n";
    system( "cd tests && make" ) and abort "Failed to build tests: $alg\n";
    system( "make test" ) and abort "Failed test suite: $alg\n";
}

system( "mv $config_h.bak $config_h" ) and die "$config_h not restored\n";
system( "make clean" ) and die;
exit 0;