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      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 
     18 package org.apache.harmony.security.x509;
     19 
     20 import java.io.IOException;
     21 import org.apache.harmony.security.asn1.ASN1OctetString;
     22 import org.apache.harmony.security.utils.Array;
     23 
     24 /**
     25  * Subject Key Identifier Extension (OID = 2.5.29.14).
     26  *
     27  * The ASN.1 definition for extension is:
     28  *
     29  * <pre>
     30  *  id-ce-subjectKeyIdentifier OBJECT IDENTIFIER ::=  { id-ce 14 }
     31  *
     32  *  SubjectKeyIdentifier ::= KeyIdentifier
     33  *
     34  *  KeyIdentifier ::= OCTET STRING
     35  * </pre>
     36  * (as specified in RFC 3280 http://www.ietf.org/rfc/rfc3280.txt)
     37  */
     38 public final class SubjectKeyIdentifier extends ExtensionValue {
     39 
     40     // the value of key identifier
     41     private final byte[] keyIdentifier;
     42 
     43     /**
     44      * Creates the object on the base of the value of key identifier.
     45      */
     46     public SubjectKeyIdentifier(byte[] keyIdentifier) {
     47         this.keyIdentifier = keyIdentifier;
     48     }
     49 
     50     /**
     51      * Creates an object on the base of its encoded form.
     52      */
     53     public static SubjectKeyIdentifier decode(byte[] encoding)
     54             throws IOException {
     55         SubjectKeyIdentifier res = new SubjectKeyIdentifier((byte[])
     56                 ASN1OctetString.getInstance().decode(encoding));
     57         res.encoding = encoding;
     58         return res;
     59     }
     60 
     61     /**
     62      * The key identifier for this subject.
     63      */
     64     public byte[] getKeyIdentifier() {
     65         return keyIdentifier;
     66     }
     67 
     68     @Override public byte[] getEncoded() {
     69         if (encoding == null) {
     70             encoding = ASN1OctetString.getInstance().encode(keyIdentifier);
     71         }
     72         return encoding;
     73     }
     74 
     75     @Override public void dumpValue(StringBuilder sb, String prefix) {
     76         sb.append(prefix).append("SubjectKeyIdentifier: [\n");
     77         sb.append(Array.toString(keyIdentifier, prefix));
     78         sb.append(prefix).append("]\n");
     79     }
     80 }
     81