OpenSSLDSAPublicKey.java revision 0731d6d00c5e30c05e035d3ae96327029d07a606 
1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package org.apache.harmony.xnet.provider.jsse;
18
19import java.io.IOException;
20import java.io.NotSerializableException;
21import java.io.ObjectInputStream;
22import java.io.ObjectOutputStream;
23import java.math.BigInteger;
24import java.security.InvalidKeyException;
25import java.security.interfaces.DSAParams;
26import java.security.interfaces.DSAPublicKey;
27import java.security.spec.DSAPublicKeySpec;
28import java.security.spec.InvalidKeySpecException;
29
30public class OpenSSLDSAPublicKey implements DSAPublicKey, OpenSSLKeyHolder {
31    private static final long serialVersionUID = 5238609500353792232L;
32
33    private transient OpenSSLKey key;
34
35    private transient OpenSSLDSAParams params;
36
37    OpenSSLDSAPublicKey(OpenSSLKey key) {
38        this.key = key;
39    }
40
41    @Override
42    public OpenSSLKey getOpenSSLKey() {
43        return key;
44    }
45
46    OpenSSLDSAPublicKey(DSAPublicKeySpec dsaKeySpec) throws InvalidKeySpecException {
47        try {
48            key = new OpenSSLKey(NativeCrypto.EVP_PKEY_new_DSA(
49                    dsaKeySpec.getP().toByteArray(),
50                    dsaKeySpec.getQ().toByteArray(),
51                    dsaKeySpec.getG().toByteArray(),
52                    dsaKeySpec.getY().toByteArray(),
53                    null));
54        } catch (Exception e) {
55            throw new InvalidKeySpecException(e);
56        }
57    }
58
59    private void ensureReadParams() {
60        if (params == null) {
61            params = new OpenSSLDSAParams(key);
62        }
63    }
64
65    static OpenSSLKey getInstance(DSAPublicKey dsaPublicKey) throws InvalidKeyException {
66        try {
67            final DSAParams dsaParams = dsaPublicKey.getParams();
68            return new OpenSSLKey(NativeCrypto.EVP_PKEY_new_DSA(
69                    dsaParams.getP().toByteArray(),
70                    dsaParams.getQ().toByteArray(),
71                    dsaParams.getG().toByteArray(),
72                    dsaPublicKey.getY().toByteArray(),
73                    null));
74        } catch (Exception e) {
75            throw new InvalidKeyException(e);
76        }
77    }
78
79    @Override
80    public DSAParams getParams() {
81        ensureReadParams();
82        return params;
83    }
84
85    @Override
86    public String getAlgorithm() {
87        return "DSA";
88    }
89
90    @Override
91    public String getFormat() {
92        return "X.509";
93    }
94
95    @Override
96    public byte[] getEncoded() {
97        return NativeCrypto.i2d_PUBKEY(key.getPkeyContext());
98    }
99
100    @Override
101    public BigInteger getY() {
102        ensureReadParams();
103        return params.getY();
104    }
105
106    @Override
107    public boolean equals(Object o) {
108        if (o == this) {
109            return true;
110        }
111
112        if (o instanceof OpenSSLDSAPublicKey) {
113            OpenSSLDSAPublicKey other = (OpenSSLDSAPublicKey) o;
114
115            /*
116             * We can shortcut the true case, but it still may be equivalent but
117             * different copies.
118             */
119            if (key.equals(other.getOpenSSLKey())) {
120                return true;
121            }
122        }
123
124        if (!(o instanceof DSAPublicKey)) {
125            return false;
126        }
127
128        ensureReadParams();
129
130        DSAPublicKey other = (DSAPublicKey) o;
131        return params.getY().equals(other.getY()) && params.equals(other.getParams());
132    }
133
134    @Override
135    public int hashCode() {
136        ensureReadParams();
137
138        return params.getY().hashCode() ^ params.hashCode();
139    }
140
141    @Override
142    public String toString() {
143        ensureReadParams();
144
145        final StringBuilder sb = new StringBuilder("OpenSSLDSAPublicKey{");
146        sb.append("Y=");
147        sb.append(params.getY().toString(16));
148        sb.append(',');
149        sb.append("params=");
150        sb.append(params.toString());
151        sb.append('}');
152
153        return sb.toString();
154    }
155
156    private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException {
157        stream.defaultReadObject();
158
159        final BigInteger g = (BigInteger) stream.readObject();
160        final BigInteger p = (BigInteger) stream.readObject();
161        final BigInteger q = (BigInteger) stream.readObject();
162        final BigInteger y = (BigInteger) stream.readObject();
163
164        key = new OpenSSLKey(NativeCrypto.EVP_PKEY_new_DSA(
165                p.toByteArray(),
166                q.toByteArray(),
167                g.toByteArray(),
168                y.toByteArray(),
169                null));
170    }
171
172    private void writeObject(ObjectOutputStream stream) throws IOException {
173        if (getOpenSSLKey().isEngineBased()) {
174            throw new NotSerializableException("engine-based keys can not be serialized");
175        }
176        stream.defaultWriteObject();
177
178        ensureReadParams();
179        stream.writeObject(params.getG());
180        stream.writeObject(params.getP());
181        stream.writeObject(params.getQ());
182        stream.writeObject(params.getY());
183    }
184}
185