OpenSSLDSAPublicKey.java revision 91bb5fbe55b854df891ff7720e30d42081dbcd58 
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.InvalidKeyException;
21import java.security.interfaces.DSAParams;
22import java.security.interfaces.DSAPublicKey;
23import java.security.spec.DSAPublicKeySpec;
24import java.security.spec.InvalidKeySpecException;
25
26public class OpenSSLDSAPublicKey implements DSAPublicKey {
27    private final OpenSSLKey key;
28
29    private OpenSSLDSAParams params;
30
31    OpenSSLDSAPublicKey(OpenSSLKey key) {
32        this.key = key;
33    }
34
35    OpenSSLKey getOpenSSLKey() {
36        return key;
37    }
38
39    OpenSSLDSAPublicKey(DSAPublicKeySpec dsaKeySpec) throws InvalidKeySpecException {
40        try {
41            key = new OpenSSLKey(NativeCrypto.EVP_PKEY_new_DSA(
42                    dsaKeySpec.getP().toByteArray(),
43                    dsaKeySpec.getQ().toByteArray(),
44                    dsaKeySpec.getG().toByteArray(),
45                    dsaKeySpec.getY().toByteArray(),
46                    null));
47        } catch (Exception e) {
48            throw new InvalidKeySpecException(e);
49        }
50    }
51
52    private void ensureReadParams() {
53        if (params == null) {
54            params = new OpenSSLDSAParams(key);
55        }
56    }
57
58    static OpenSSLKey getInstance(DSAPublicKey dsaPublicKey) throws InvalidKeyException {
59        try {
60            final DSAParams dsaParams = dsaPublicKey.getParams();
61            return new OpenSSLKey(NativeCrypto.EVP_PKEY_new_DSA(
62                    dsaParams.getP().toByteArray(),
63                    dsaParams.getQ().toByteArray(),
64                    dsaParams.getG().toByteArray(),
65                    dsaPublicKey.getY().toByteArray(),
66                    null));
67        } catch (Exception e) {
68            throw new InvalidKeyException(e);
69        }
70    }
71
72    @Override
73    public DSAParams getParams() {
74        ensureReadParams();
75        return params;
76    }
77
78    @Override
79    public String getAlgorithm() {
80        return "DSA";
81    }
82
83    @Override
84    public String getFormat() {
85        return "X.509";
86    }
87
88    @Override
89    public byte[] getEncoded() {
90        return NativeCrypto.i2d_PUBKEY(key.getPkeyContext());
91    }
92
93    @Override
94    public BigInteger getY() {
95        ensureReadParams();
96        return params.getY();
97    }
98}
99