OpenSSLMac.java revision 0d4ee1f9b8c37fb33cd74da4efac5905ba138e45 
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.security.InvalidAlgorithmParameterException;
20import java.security.InvalidKeyException;
21import java.security.Key;
22import java.security.NoSuchAlgorithmException;
23import java.security.spec.AlgorithmParameterSpec;
24
25import javax.crypto.MacSpi;
26import javax.crypto.SecretKey;
27
28public abstract class OpenSSLMac extends MacSpi {
29    private final OpenSSLDigestContext ctx = new OpenSSLDigestContext(
30            NativeCrypto.EVP_MD_CTX_create());
31
32    /**
33     * Holds the EVP_MD for the hashing algorithm, e.g.
34     * EVP_get_digestbyname("sha1");
35     */
36    private final int evp_md;
37
38    /**
39     * The key type of the secret key.
40     */
41    private final int evp_pkey_type;
42
43    /**
44     * The secret key used in this keyed MAC.
45     */
46    private OpenSSLKey macKey;
47
48    /**
49     * Holds the output size of the message digest.
50     */
51    private final int size;
52
53    /**
54     * Holds a dummy buffer for writing single bytes to the digest.
55     */
56    private final byte[] singleByte = new byte[1];
57
58    protected OpenSSLMac(int evp_md, int size, int evp_pkey_type) {
59        this.evp_md = evp_md;
60        this.size = size;
61        this.evp_pkey_type = evp_pkey_type;
62    }
63
64    @Override
65    protected int engineGetMacLength() {
66        return size;
67    }
68
69    @Override
70    protected void engineInit(Key key, AlgorithmParameterSpec params) throws InvalidKeyException,
71            InvalidAlgorithmParameterException {
72        if (!(key instanceof SecretKey)) {
73            throw new InvalidKeyException("key must be a SecretKey");
74        }
75
76        if (params != null) {
77            throw new InvalidAlgorithmParameterException("unknown parameter type");
78        }
79
80        final byte[] keyBytes = key.getEncoded();
81        if (keyBytes == null) {
82            throw new InvalidKeyException("key cannot be encoded");
83        }
84
85        NativeCrypto.EVP_MD_CTX_init(ctx.getContext());
86        macKey = new OpenSSLKey(NativeCrypto.EVP_PKEY_new_mac_key(evp_pkey_type, keyBytes));
87
88        reset();
89    }
90
91    private void reset() {
92        NativeCrypto.EVP_DigestSignInit(ctx.getContext(), evp_md, macKey.getPkeyContext());
93    }
94
95    @Override
96    protected void engineUpdate(byte input) {
97        singleByte[0] = input;
98        engineUpdate(singleByte, 0, 1);
99    }
100
101    @Override
102    protected void engineUpdate(byte[] input, int offset, int len) {
103        NativeCrypto.EVP_DigestUpdate(ctx.getContext(), input, offset, len);
104    }
105
106    @Override
107    protected byte[] engineDoFinal() {
108        final byte[] output = NativeCrypto.EVP_DigestSignFinal(ctx.getContext());
109        reset();
110        return output;
111    }
112
113    @Override
114    protected void engineReset() {
115        reset();
116    }
117
118    public static class HmacMD5 extends OpenSSLMac {
119        private static final int EVP_MD = NativeCrypto.EVP_get_digestbyname("md5");
120        private static final int SIZE = NativeCrypto.EVP_MD_size(EVP_MD);
121
122        public HmacMD5() {
123            super(EVP_MD, SIZE, NativeCrypto.EVP_PKEY_HMAC);
124        }
125    }
126
127    public static class HmacSHA1 extends OpenSSLMac {
128        private static final int EVP_MD = NativeCrypto.EVP_get_digestbyname("sha1");
129        private static final int SIZE = NativeCrypto.EVP_MD_size(EVP_MD);
130
131        public HmacSHA1() {
132            super(EVP_MD, SIZE, NativeCrypto.EVP_PKEY_HMAC);
133        }
134    }
135
136    public static class HmacSHA256 extends OpenSSLMac {
137        private static final int EVP_MD = NativeCrypto.EVP_get_digestbyname("sha256");
138        private static final int SIZE = NativeCrypto.EVP_MD_size(EVP_MD);
139
140        public HmacSHA256() throws NoSuchAlgorithmException {
141            super(EVP_MD, SIZE, NativeCrypto.EVP_PKEY_HMAC);
142        }
143    }
144
145    public static class HmacSHA384 extends OpenSSLMac {
146        private static final int EVP_MD = NativeCrypto.EVP_get_digestbyname("sha384");
147        private static final int SIZE = NativeCrypto.EVP_MD_size(EVP_MD);
148
149        public HmacSHA384() throws NoSuchAlgorithmException {
150            super(EVP_MD, SIZE, NativeCrypto.EVP_PKEY_HMAC);
151        }
152    }
153
154    public static class HmacSHA512 extends OpenSSLMac {
155        private static final int EVP_MD = NativeCrypto.EVP_get_digestbyname("sha512");
156        private static final int SIZE = NativeCrypto.EVP_MD_size(EVP_MD);
157
158        public HmacSHA512() {
159            super(EVP_MD, SIZE, NativeCrypto.EVP_PKEY_HMAC);
160        }
161    }
162}
163