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/*
* Copyright (C) 2020 The Android Open Source Project
*
* 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.
*/
package com.android.internal.net.ipsec.ike.utils;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.Network;
import android.net.NetworkCapabilities;
import com.android.internal.annotations.VisibleForTesting;
import com.android.internal.net.eap.EapAuthenticator.EapRandomFactory;
import com.android.internal.net.ipsec.ike.testmode.DeterministicSecureRandom;
import java.security.SecureRandom;
/** Factory class that creates a DeterministicSecureRandom when test mode is enabled */
@VisibleForTesting
public class RandomnessFactory implements EapRandomFactory {
// This constant is mirrored of android.net.NetworkCapabilities.TRANSPORT_TEST due to lack of
// @TestApi guarantees in mainline modules
public static final int NETWORK_CAPABILITY_TRANSPORT_TEST = 7;
private final boolean mIsTestModeEnabled;
public RandomnessFactory(Context context, Network network) {
ConnectivityManager connectManager =
(ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkCapabilities networkCapabilities = connectManager.getNetworkCapabilities(network);
mIsTestModeEnabled =
networkCapabilities != null
&& networkCapabilities.hasCapability(NETWORK_CAPABILITY_TRANSPORT_TEST);
}
/**
* Returns a DeterministicSecureRandom instance when test mode is enabled.
*
* <p>Returns a DeterministicSecureRandom instance when test mode is enabled, otherwise returns
* null
*
* <p>TODO(b/154941518): figure out how to let this method always return a random without
* relying on nullability behavior
*/
@Override
public SecureRandom getRandom() {
if (mIsTestModeEnabled) {
return new DeterministicSecureRandom();
}
return null;
}
}
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