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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 android.service.displayhash;
import android.graphics.Rect;
import android.hardware.HardwareBuffer;
import android.os.RemoteCallback;
import android.view.displayhash.DisplayHash;
/**
* Service used to handle DisplayHash requests.
*
* @hide
*/
oneway interface IDisplayHashingService {
/**
* Generates the DisplayHash that can be used to validate that the system generated the token.
*
* @param salt The salt to use when generating the hmac. This should be unique to the caller so
* the token cannot be verified by any other process.
* @param buffer The buffer to generate the hash for.
* @param bounds The size and position of the content being hashed in window space.
* @param hashAlgorithm The String for the hash algorithm to use based on values in
* {@link #SERVICE_META_DATA_KEY_AVAILABLE_ALGORITHMS}.
* @param Callback The callback invoked to send back the DisplayHash.
*/
void generateDisplayHash(in byte[] salt, in HardwareBuffer buffer, in Rect bounds,
in String hashAlgorithm, in RemoteCallback callback);
/**
* Call to verify that the DisplayHash passed in was generated by the system. The result
* will be sent in the callback as a boolean with the key {@link #EXTRA_VERIFIED_DISPLAY_HASH}.
*
* @param salt The salt value to use when verifying the hmac. This should be the same value that
* was passed to {@link generateDisplayHash()} to generate the DisplayHash.
* @param displayHash The hash to verify that it was generated by the system.
* @param callback The callback invoked to send back the VerifiedDisplayHash.
*/
void verifyDisplayHash(in byte[] salt, in DisplayHash displayHash, in RemoteCallback callback);
/**
* Call to get a map of supported algorithms and their {@link DisplayHashParams}
*
* @param callback The callback invoked to send back the map of algorithms to DisplayHashParams.
*/
void getDisplayHashAlgorithms(in RemoteCallback callback);
/**
* Call to get the interval required between display hash requests. Requests made faster than
* this will be throttled. The result will be sent in the callback as an int with the key
* {@link #EXTRA_INTERVAL_BETWEEN_REQUESTS}.
*
* @param callback The callback invoked to send back the interval duration.
*/
void getIntervalBetweenRequestsMillis(in RemoteCallback callback);
}
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