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Java > Open Source Codes > org > apache > geronimo > util > asn1 > sec > ECPrivateKeyStructure


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.geronimo.util.asn1.sec;
19
20 import java.math.BigInteger JavaDoc;
21 import org.apache.geronimo.util.asn1.*;
22
23 /**
24  * the elliptic curve private key object from SEC 1
25  */
26 public class ECPrivateKeyStructure
27     extends ASN1Encodable
28 {
29     private ASN1Sequence seq;
30
31     public ECPrivateKeyStructure(
32         ASN1Sequence seq)
33     {
34         this.seq = seq;
35     }
36
37     public ECPrivateKeyStructure(
38         BigInteger JavaDoc key)
39     {
40         byte[] bytes = key.toByteArray();
41
42         if (bytes[0] == 0)
43         {
44             byte[] tmp = new byte[bytes.length - 1];
45
46             System.arraycopy(bytes, 1, tmp, 0, tmp.length);
47             bytes = tmp;
48         }
49
50         ASN1EncodableVector v = new ASN1EncodableVector();
51
52         v.add(new DERInteger(1));
53         v.add(new DEROctetString(bytes));
54
55         seq = new DERSequence(v);
56     }
57
58     public BigInteger JavaDoc getKey()
59     {
60         ASN1OctetString octs = (ASN1OctetString)seq.getObjectAt(1);
61
62         BigInteger JavaDoc k = new BigInteger JavaDoc(1, octs.getOctets());
63
64         return k;
65     }
66
67     public DERObject toASN1Object()
68     {
69         return seq;
70     }
71 }
72
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