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