76 lines
2.8 KiB
Java
76 lines
2.8 KiB
Java
/*
|
|
* 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 android.security;
|
|
|
|
import android.annotation.NonNull;
|
|
import android.hardware.security.keymint.HardwareAuthToken;
|
|
import android.hardware.security.secureclock.Timestamp;
|
|
|
|
import java.nio.ByteBuffer;
|
|
import java.nio.ByteOrder;
|
|
|
|
/**
|
|
* @hide This Utils class provides method(s) for AuthToken conversion.
|
|
*/
|
|
public class AuthTokenUtils {
|
|
|
|
private AuthTokenUtils(){
|
|
}
|
|
|
|
/**
|
|
* Build a HardwareAuthToken from a byte array
|
|
* @param array byte array representing an auth token
|
|
* @return HardwareAuthToken representation of an auth token
|
|
*/
|
|
public static @NonNull HardwareAuthToken toHardwareAuthToken(@NonNull byte[] array) {
|
|
final HardwareAuthToken hardwareAuthToken = new HardwareAuthToken();
|
|
|
|
// First byte is version, which does not exist in HardwareAuthToken anymore
|
|
// Next 8 bytes is the challenge.
|
|
hardwareAuthToken.challenge =
|
|
ByteBuffer.wrap(array, 1, 8).order(ByteOrder.nativeOrder()).getLong();
|
|
|
|
// Next 8 bytes is the userId
|
|
hardwareAuthToken.userId =
|
|
ByteBuffer.wrap(array, 9, 8).order(ByteOrder.nativeOrder()).getLong();
|
|
|
|
// Next 8 bytes is the authenticatorId.
|
|
hardwareAuthToken.authenticatorId =
|
|
ByteBuffer.wrap(array, 17, 8).order(ByteOrder.nativeOrder()).getLong();
|
|
|
|
// while the other fields are in machine byte order, authenticatorType and timestamp
|
|
// are in network byte order.
|
|
// Next 4 bytes is the authenticatorType.
|
|
hardwareAuthToken.authenticatorType =
|
|
ByteBuffer.wrap(array, 25, 4).order(ByteOrder.BIG_ENDIAN).getInt();
|
|
// Next 8 bytes is the timestamp.
|
|
final Timestamp timestamp = new Timestamp();
|
|
timestamp.milliSeconds =
|
|
ByteBuffer.wrap(array, 29, 8).order(ByteOrder.BIG_ENDIAN).getLong();
|
|
hardwareAuthToken.timestamp = timestamp;
|
|
|
|
// Last 32 bytes is the mac, 37:69
|
|
hardwareAuthToken.mac = new byte[32];
|
|
System.arraycopy(array, 37 /* srcPos */,
|
|
hardwareAuthToken.mac,
|
|
0 /* destPos */,
|
|
32 /* length */);
|
|
|
|
return hardwareAuthToken;
|
|
}
|
|
}
|