/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.cassandra.security;
import java.io.IOException;
import java.security.Key;
/**
* Customizable key retrieval mechanism. Implementations should expect that retrieved keys will be cached.
* Further, each key will be requested non-concurrently (that is, no stampeding herds for the same key), although
* unique keys may be requested concurrently (unless you mark {@code getSecretKey} synchronized).
*
* Implementations must provide a constructor that accepts {@code TransparentDataEncryptionOptions} as the sole parameter.
*/
public interface KeyProvider
{
Key getSecretKey(String alias) throws IOException;
}