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/*
* Copyright (C) 2021 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 android.net.vcn.persistablebundleutils;
import android.annotation.NonNull;
import android.net.ipsec.ike.SaProposal;
import android.os.PersistableBundle;
import android.util.Pair;
import com.android.server.vcn.util.PersistableBundleUtils;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
/**
* Abstract utility class to convert SaProposal to/from PersistableBundle.
*
* @hide
*/
abstract class SaProposalUtilsBase {
static final String ENCRYPT_ALGO_KEY = "ENCRYPT_ALGO_KEY";
static final String INTEGRITY_ALGO_KEY = "INTEGRITY_ALGO_KEY";
static final String DH_GROUP_KEY = "DH_GROUP_KEY";
static class EncryptionAlgoKeyLenPair {
private static final String ALGO_KEY = "ALGO_KEY";
private static final String KEY_LEN_KEY = "KEY_LEN_KEY";
public final int encryptionAlgo;
public final int keyLen;
EncryptionAlgoKeyLenPair(int encryptionAlgo, int keyLen) {
this.encryptionAlgo = encryptionAlgo;
this.keyLen = keyLen;
}
EncryptionAlgoKeyLenPair(PersistableBundle in) {
Objects.requireNonNull(in, "PersistableBundle was null");
this.encryptionAlgo = in.getInt(ALGO_KEY);
this.keyLen = in.getInt(KEY_LEN_KEY);
}
public PersistableBundle toPersistableBundle() {
final PersistableBundle result = new PersistableBundle();
result.putInt(ALGO_KEY, encryptionAlgo);
result.putInt(KEY_LEN_KEY, keyLen);
return result;
}
}
/**
* Serializes common info of a SaProposal to a PersistableBundle.
*
* @hide
*/
@NonNull
static PersistableBundle toPersistableBundle(SaProposal proposal) {
final PersistableBundle result = new PersistableBundle();
final List<EncryptionAlgoKeyLenPair> encryptAlgoKeyLenPairs = new ArrayList<>();
for (Pair<Integer, Integer> pair : proposal.getEncryptionAlgorithms()) {
encryptAlgoKeyLenPairs.add(new EncryptionAlgoKeyLenPair(pair.first, pair.second));
}
final PersistableBundle encryptionBundle =
PersistableBundleUtils.fromList(
encryptAlgoKeyLenPairs, EncryptionAlgoKeyLenPair::toPersistableBundle);
result.putPersistableBundle(ENCRYPT_ALGO_KEY, encryptionBundle);
final int[] integrityAlgoIdArray =
proposal.getIntegrityAlgorithms().stream().mapToInt(i -> i).toArray();
result.putIntArray(INTEGRITY_ALGO_KEY, integrityAlgoIdArray);
final int[] dhGroupArray = proposal.getDhGroups().stream().mapToInt(i -> i).toArray();
result.putIntArray(DH_GROUP_KEY, dhGroupArray);
return result;
}
}
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