SubjectKeyIdentifier.java revision fd6bb3510c2f94d636f3572dcf5f7f4dcd1a2726 
1/*
2 *  Licensed to the Apache Software Foundation (ASF) under one or more
3 *  contributor license agreements.  See the NOTICE file distributed with
4 *  this work for additional information regarding copyright ownership.
5 *  The ASF licenses this file to You under the Apache License, Version 2.0
6 *  (the "License"); you may not use this file except in compliance with
7 *  the License.  You may obtain a copy of the License at
8 *
9 *     http://www.apache.org/licenses/LICENSE-2.0
10 *
11 *  Unless required by applicable law or agreed to in writing, software
12 *  distributed under the License is distributed on an "AS IS" BASIS,
13 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 *  See the License for the specific language governing permissions and
15 *  limitations under the License.
16 */
17
18package org.apache.harmony.security.x509;
19
20import java.io.IOException;
21
22import org.apache.harmony.security.asn1.ASN1OctetString;
23import org.apache.harmony.security.utils.Array;
24
25/**
26 * Subject Key Identifier Extension (OID = 2.5.29.14).
27 *
28 * The ASN.1 definition for extension is:
29 *
30 * <pre>
31 *  id-ce-subjectKeyIdentifier OBJECT IDENTIFIER ::=  { id-ce 14 }
32 *
33 *  SubjectKeyIdentifier ::= KeyIdentifier
34 *
35 *  KeyIdentifier ::= OCTET STRING
36 * </pre>
37 * (as specified in RFC 3280 http://www.ietf.org/rfc/rfc3280.txt)
38 */
39public class SubjectKeyIdentifier extends ExtensionValue {
40
41    // the value of key identifier
42    private final byte[] keyIdentifier;
43
44    /**
45     * Creates the object on the base of the value of key identifier.
46     */
47    public SubjectKeyIdentifier(byte[] keyIdentifier) {
48        this.keyIdentifier = keyIdentifier;
49    }
50
51    /**
52     * Creates an object on the base of its encoded form.
53     */
54    public static SubjectKeyIdentifier decode(byte[] encoding)
55            throws IOException {
56        SubjectKeyIdentifier res = new SubjectKeyIdentifier((byte[])
57                ASN1OctetString.getInstance().decode(encoding));
58        res.encoding = encoding;
59        return res;
60    }
61
62    /**
63     * Returns ASN.1 encoded form of extension.
64     * @return a byte array containing ASN.1 encoded form.
65     */
66    public byte[] getEncoded() {
67        if (encoding == null) {
68            encoding = ASN1OctetString.getInstance().encode(keyIdentifier);
69        }
70        return encoding;
71    }
72
73    /**
74     * Places the string representation of extension value
75     * into the StringBuffer object.
76     */
77    public void dumpValue(StringBuffer buffer, String prefix) {
78        buffer.append(prefix).append("SubjectKeyIdentifier: [\n");
79        buffer.append(Array.toString(keyIdentifier, prefix));
80        buffer.append(prefix).append("]\n");
81    }
82}
83
84