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.math.BigInteger;
20import java.security.interfaces.DSAParams;
21import java.security.spec.AlgorithmParameterSpec;
22
23public class OpenSSLDSAParams implements DSAParams, AlgorithmParameterSpec {
24
25    private OpenSSLKey key;
26
27    private boolean fetchedParams;
28
29    private BigInteger g;
30
31    private BigInteger p;
32
33    private BigInteger q;
34
35    private BigInteger y;
36
37    private BigInteger x;
38
39    OpenSSLDSAParams(OpenSSLKey key) {
40        this.key = key;
41    }
42
43    OpenSSLKey getOpenSSLKey() {
44        return key;
45    }
46
47    private synchronized final void ensureReadParams() {
48        if (fetchedParams) {
49            return;
50        }
51
52        byte[][] params = NativeCrypto.get_DSA_params(key.getPkeyContext());
53        g = new BigInteger(params[0]);
54        p = new BigInteger(params[1]);
55        q = new BigInteger(params[2]);
56        if (params[3] != null) {
57            y = new BigInteger(params[3]);
58        }
59        if (params[4] != null) {
60            x = new BigInteger(params[4]);
61        }
62
63        fetchedParams = true;
64    }
65
66    @Override
67    public BigInteger getG() {
68        ensureReadParams();
69        return g;
70    }
71
72    @Override
73    public BigInteger getP() {
74        ensureReadParams();
75        return p;
76    }
77
78    @Override
79    public BigInteger getQ() {
80        ensureReadParams();
81        return q;
82    }
83
84    BigInteger getY() {
85        ensureReadParams();
86        return y;
87    }
88
89    BigInteger getX() {
90        ensureReadParams();
91        return x;
92    }
93
94    @Override
95    public boolean equals(Object o) {
96        if (o == this) {
97            return true;
98        }
99
100        if (o instanceof OpenSSLDSAParams) {
101            OpenSSLDSAParams other = (OpenSSLDSAParams) o;
102
103            /*
104             * We can shortcut the true case, but it still may be equivalent but
105             * different copies.
106             */
107            if (key == other.getOpenSSLKey()) {
108                return true;
109            }
110        }
111
112        if (!(o instanceof DSAParams)) {
113            return false;
114        }
115
116        ensureReadParams();
117
118        DSAParams other = (DSAParams) o;
119        return g.equals(other.getG()) && p.equals(other.getP()) && q.equals(other.getQ());
120    }
121
122    @Override
123    public int hashCode() {
124        ensureReadParams();
125
126        return g.hashCode() ^ p.hashCode() ^ q.hashCode();
127    }
128
129    @Override
130    public String toString() {
131        ensureReadParams();
132
133        final StringBuilder sb = new StringBuilder("OpenSSLDSAParams{");
134        sb.append("G=");
135        sb.append(g.toString(16));
136        sb.append(",P=");
137        sb.append(p.toString(16));
138        sb.append(",Q=");
139        sb.append(q.toString(16));
140        sb.append('}');
141
142        return sb.toString();
143    }
144}
145