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      1 /*
      2  *  Licensed to the Apache Software Foundation (ASF) under one or more
      3  *  contributor license agreements.  See the NOTICE file distributed with
      4  *  this work for additional information regarding copyright ownership.
      5  *  The ASF licenses this file to You under the Apache License, Version 2.0
      6  *  (the "License"); you may not use this file except in compliance with
      7  *  the License.  You may obtain a copy of the License at
      8  *
      9  *     http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  *  Unless required by applicable law or agreed to in writing, software
     12  *  distributed under the License is distributed on an "AS IS" BASIS,
     13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  *  See the License for the specific language governing permissions and
     15  *  limitations under the License.
     16  */
     17 
     18 package javax.crypto;
     19 
     20 import java.security.Key;
     21 
     22 /**
     23  * A cryptographic secret (symmetric) key.
     24  * <p>
     25  * This interface is a <i>marker interface</i> to group secret keys and to
     26  * provide type safety for.
     27  * <p>
     28  * Implementations of this interface have to overwrite the
     29  * {@link Object#equals(Object) equals} and {@link Object#hashCode() hashCode}
     30  * from {@link java.lang.Object} so comparison is done using the actual key data
     31  * and not the object reference.
     32  */
     33 public interface SecretKey extends Key {
     34 
     35     /**
     36      * The serialization version identifier.
     37      *
     38      * @serial
     39      */
     40     public static final long serialVersionUID = -4795878709595146952L;
     41 }