1 /*
2  * Copyright (C) 2015 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package android.security.keystore;
18 
19 import android.security.KeyStore;
20 
21 /**
22  * Cryptographic operation backed by {@link KeyStore}.
23  *
24  * @hide
25  */
26 public interface KeyStoreCryptoOperation {
27     /**
28      * Gets the KeyStore operation handle of this crypto operation.
29      *
30      * @return handle or {@code 0} if the KeyStore operation is not in progress.
31      */
getOperationHandle()32     long getOperationHandle();
33 }
34