1/*
2 * Copyright (c) 2006, 2013, 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
26package sun.security.ec;
27
28import java.io.IOException;
29
30import java.security.*;
31import java.security.interfaces.*;
32import java.security.spec.*;
33
34import sun.security.util.ECParameters;
35import sun.security.util.ECUtil;
36
37import sun.security.x509.*;
38
39/**
40 * Key implementation for EC public keys.
41 *
42 * @since   1.6
43 * @author  Andreas Sterbenz
44 */
45public final class ECPublicKeyImpl extends X509Key implements ECPublicKey {
46
47    private static final long serialVersionUID = -2462037275160462289L;
48
49    private ECPoint w;
50    private ECParameterSpec params;
51
52    /**
53     * Construct a key from its components. Used by the
54     * ECKeyFactory.
55     */
56    @SuppressWarnings("deprecation")
57    ECPublicKeyImpl(ECPoint w, ECParameterSpec params)
58            throws InvalidKeyException {
59        this.w = w;
60        this.params = params;
61        // generate the encoding
62        algid = new AlgorithmId
63            (AlgorithmId.EC_oid, ECParameters.getAlgorithmParameters(params));
64        key = ECUtil.encodePoint(w, params.getCurve());
65    }
66
67    /**
68     * Construct a key from its encoding.
69     */
70    ECPublicKeyImpl(byte[] encoded) throws InvalidKeyException {
71        decode(encoded);
72    }
73
74    // see JCA doc
75    public String getAlgorithm() {
76        return "EC";
77    }
78
79    // see JCA doc
80    public ECPoint getW() {
81        return w;
82    }
83
84    // see JCA doc
85    public ECParameterSpec getParams() {
86        return params;
87    }
88
89    // Internal API to get the encoded point. Currently used by SunPKCS11.
90    // This may change/go away depending on what we do with the public API.
91    @SuppressWarnings("deprecation")
92    public byte[] getEncodedPublicValue() {
93        return key.clone();
94    }
95
96    /**
97     * Parse the key. Called by X509Key.
98     */
99    @SuppressWarnings("deprecation")
100    protected void parseKeyBits() throws InvalidKeyException {
101        AlgorithmParameters algParams = this.algid.getParameters();
102        if (algParams == null) {
103            throw new InvalidKeyException("EC domain parameters must be " +
104                "encoded in the algorithm identifier");
105        }
106
107        try {
108            params = algParams.getParameterSpec(ECParameterSpec.class);
109            w = ECUtil.decodePoint(key, params.getCurve());
110        } catch (IOException e) {
111            throw new InvalidKeyException("Invalid EC key", e);
112        } catch (InvalidParameterSpecException e) {
113            throw new InvalidKeyException("Invalid EC key", e);
114        }
115    }
116
117    // return a string representation of this key for debugging
118    public String toString() {
119        return "Sun EC public key, " + params.getCurve().getField().getFieldSize()
120            + " bits\n  public x coord: " + w.getAffineX()
121            + "\n  public y coord: " + w.getAffineY()
122            + "\n  parameters: " + params;
123    }
124
125    protected Object writeReplace() throws java.io.ObjectStreamException {
126        return new KeyRep(KeyRep.Type.PUBLIC,
127                        getAlgorithm(),
128                        getFormat(),
129                        getEncoded());
130    }
131}
132