1 /*
   2  * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.security.ec;
  27 
  28 import java.security.interfaces.XECPrivateKey;
  29 import java.util.Optional;
  30 import java.security.InvalidKeyException;
  31 import java.security.PrivateKey;
  32 import java.security.spec.AlgorithmParameterSpec;
  33 import java.security.spec.NamedParameterSpec;
  34 
  35 import sun.security.pkcs.PKCS8Key;
  36 import sun.security.x509.AlgorithmId;
  37 
  38 public final class XDHPrivateKeyImpl extends PKCS8Key implements XECPrivateKey {
  39 
  40     private static final long serialVersionUID = 1L;
  41 
  42     private AlgorithmParameterSpec paramSpec;
  43 
  44     XDHPrivateKeyImpl(XECParameters params, byte[] k)
  45         throws InvalidKeyException {
  46 
  47         this.paramSpec = new NamedParameterSpec(params.getName());
  48         this.algid = new AlgorithmId(params.getOid());
  49         this.key = k.clone();
  50 
  51         checkLength(params);
  52     }
  53 
  54     XDHPrivateKeyImpl(byte[] encoded) throws InvalidKeyException {
  55 
  56         decode(encoded);
  57         XECParameters params = XECParameters.get(
  58             InvalidKeyException::new, algid);
  59         paramSpec = new NamedParameterSpec(params.getName());
  60 
  61         checkLength(params);
  62     }
  63 
  64     void checkLength(XECParameters params) throws InvalidKeyException {
  65 
  66         if (params.getBytes() != this.key.length) {
  67             throw new InvalidKeyException(
  68                 "key length must be " + params.getBytes());
  69         }
  70     }
  71 
  72     public byte[] getK() {
  73         return key.clone();
  74     }
  75 
  76     @Override
  77     public String getAlgorithm() {
  78         return "XDH";
  79     }
  80 
  81     @Override
  82     public AlgorithmParameterSpec getParams() {
  83         return paramSpec;
  84     }
  85 
  86     @Override
  87     public Optional<byte[]> getScalar() {
  88         return Optional.of(getK());
  89     }
  90 }
  91