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/*
* Copyright (C) 2022 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.keystore2;
import android.annotation.NonNull;
import android.security.KeyStoreSecurityLevel;
import android.system.keystore2.Authorization;
import android.system.keystore2.KeyDescriptor;
import java.security.PrivateKey;
import java.security.interfaces.XECPrivateKey;
import java.security.spec.NamedParameterSpec;
import java.util.Optional;
/**
* X25519 Private Key backed by Keystore.
* instance of {@link PrivateKey} and {@link XECPrivateKey}
*
* @hide
*/
public class AndroidKeyStoreXDHPrivateKey extends AndroidKeyStorePrivateKey
implements XECPrivateKey {
public AndroidKeyStoreXDHPrivateKey(
@NonNull KeyDescriptor descriptor, long keyId,
@NonNull Authorization[] authorizations,
@NonNull String algorithm,
@NonNull KeyStoreSecurityLevel securityLevel) {
super(descriptor, keyId, authorizations, algorithm, securityLevel);
}
@Override
public NamedParameterSpec getParams() {
return NamedParameterSpec.X25519;
}
@Override
public Optional<byte[]> getScalar() {
/* An empty Optional if the scalar cannot be extracted (e.g. if the provider is a hardware
* token and the private key is not allowed to leave the crypto boundary).
*/
return Optional.empty();
}
}
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