blob: 28a9c33a4f822e0ddbc9515d289e1cfa7d4aecfd [file] [log] [blame]
/*
* Copyright 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 com.android.server.nearby.common.bluetooth.fastpair;
import static com.android.server.nearby.common.bluetooth.fastpair.AesEcbSingleBlockEncryption.generateKey;
import com.android.server.nearby.common.bluetooth.fastpair.Constants.FastPairService.AccountKeyCharacteristic;
import java.security.NoSuchAlgorithmException;
/**
* This is to generate account key with fast-pair style.
*/
public final class AccountKeyGenerator {
// Generate a key where the first byte is always defined as the type, 0x04. This maintains 15
// bytes of entropy in the key while also allowing providers to verify that they have received
// a properly formatted key and decrypted it correctly, minimizing the risk of replay attacks.
/**
* Creates account key.
*/
public static byte[] createAccountKey() throws NoSuchAlgorithmException {
byte[] accountKey = generateKey();
accountKey[0] = AccountKeyCharacteristic.TYPE;
return accountKey;
}
private AccountKeyGenerator() {
}
}