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.conscrypt;
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        if (params[0] != null) {
54            g = new BigInteger(params[0]);
55        }
56        if (params[1] != null) {
57            p = new BigInteger(params[1]);
58        }
59        if (params[2] != null) {
60            q = new BigInteger(params[2]);
61        }
62        if (params[3] != null) {
63            y = new BigInteger(params[3]);
64        }
65        if (params[4] != null) {
66            x = new BigInteger(params[4]);
67        }
68
69        fetchedParams = true;
70    }
71
72    @Override
73    public BigInteger getG() {
74        ensureReadParams();
75        return g;
76    }
77
78    @Override
79    public BigInteger getP() {
80        ensureReadParams();
81        return p;
82    }
83
84    @Override
85    public BigInteger getQ() {
86        ensureReadParams();
87        return q;
88    }
89
90    boolean hasParams() {
91        ensureReadParams();
92        return (g != null) && (p != null) && (q != null);
93    }
94
95    BigInteger getY() {
96        ensureReadParams();
97        return y;
98    }
99
100    BigInteger getX() {
101        ensureReadParams();
102        return x;
103    }
104
105    @Override
106    public boolean equals(Object o) {
107        if (o == this) {
108            return true;
109        }
110
111        if (o instanceof OpenSSLDSAParams) {
112            OpenSSLDSAParams other = (OpenSSLDSAParams) o;
113
114            /*
115             * We can shortcut the true case, but it still may be equivalent but
116             * different copies.
117             */
118            if (key == other.getOpenSSLKey()) {
119                return true;
120            }
121        }
122
123        if (!(o instanceof DSAParams)) {
124            return false;
125        }
126
127        ensureReadParams();
128
129        DSAParams other = (DSAParams) o;
130        return g.equals(other.getG()) && p.equals(other.getP()) && q.equals(other.getQ());
131    }
132
133    @Override
134    public int hashCode() {
135        ensureReadParams();
136
137        return g.hashCode() ^ p.hashCode() ^ q.hashCode();
138    }
139
140    @Override
141    public String toString() {
142        ensureReadParams();
143
144        final StringBuilder sb = new StringBuilder("OpenSSLDSAParams{");
145        sb.append("G=");
146        sb.append(g.toString(16));
147        sb.append(",P=");
148        sb.append(p.toString(16));
149        sb.append(",Q=");
150        sb.append(q.toString(16));
151        sb.append('}');
152
153        return sb.toString();
154    }
155}
156