01: /**
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * 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: */package org.apache.geronimo.crypto.asn1;
17:
18: import java.io.ByteArrayOutputStream;
19: import java.io.IOException;
20: import java.util.Enumeration;
21:
22: public class DERSequence extends ASN1Sequence {
23: /**
24: * create an empty sequence
25: */
26: public DERSequence() {
27: }
28:
29: /**
30: * create a sequence containing one object
31: */
32: public DERSequence(DEREncodable obj) {
33: this .addObject(obj);
34: }
35:
36: /**
37: * create a sequence containing a vector of objects.
38: */
39: public DERSequence(DEREncodableVector v) {
40: for (int i = 0; i != v.size(); i++) {
41: this .addObject(v.get(i));
42: }
43: }
44:
45: /**
46: * create a sequence containing an array of objects.
47: */
48: public DERSequence(ASN1Encodable[] a) {
49: for (int i = 0; i != a.length; i++) {
50: this .addObject(a[i]);
51: }
52: }
53:
54: /*
55: * A note on the implementation:
56: * <p>
57: * As DER requires the constructed, definite-length model to
58: * be used for structured types, this varies slightly from the
59: * ASN.1 descriptions given. Rather than just outputing SEQUENCE,
60: * we also have to specify CONSTRUCTED, and the objects length.
61: */
62: void encode(DEROutputStream out) throws IOException {
63: ByteArrayOutputStream bOut = new ByteArrayOutputStream();
64: DEROutputStream dOut = new DEROutputStream(bOut);
65: Enumeration e = this .getObjects();
66:
67: while (e.hasMoreElements()) {
68: Object obj = e.nextElement();
69:
70: dOut.writeObject(obj);
71: }
72:
73: dOut.close();
74:
75: byte[] bytes = bOut.toByteArray();
76:
77: out.writeEncoded(SEQUENCE | CONSTRUCTED, bytes);
78: }
79: }
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