001    /**
002     *
003     *  Licensed to the Apache Software Foundation (ASF) under one or more
004     *  contributor license agreements.  See the NOTICE file distributed with
005     *  this work for additional information regarding copyright ownership.
006     *  The ASF licenses this file to You under the Apache License, Version 2.0
007     *  (the "License"); you may not use this file except in compliance with
008     *  the License.  You may obtain a copy of the License at
009     *
010     *     http://www.apache.org/licenses/LICENSE-2.0
011     *
012     *  Unless required by applicable law or agreed to in writing, software
013     *  distributed under the License is distributed on an "AS IS" BASIS,
014     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     *  See the License for the specific language governing permissions and
016     *  limitations under the License.
017     */
018    
019    package org.apache.geronimo.util.asn1.sec;
020    
021    import java.math.BigInteger;
022    import org.apache.geronimo.util.asn1.*;
023    
024    /**
025     * the elliptic curve private key object from SEC 1
026     */
027    public class ECPrivateKeyStructure
028        extends ASN1Encodable
029    {
030        private ASN1Sequence  seq;
031    
032        public ECPrivateKeyStructure(
033            ASN1Sequence  seq)
034        {
035            this.seq = seq;
036        }
037    
038        public ECPrivateKeyStructure(
039            BigInteger  key)
040        {
041            byte[]  bytes = key.toByteArray();
042    
043            if (bytes[0] == 0)
044            {
045                byte[]  tmp = new byte[bytes.length - 1];
046    
047                System.arraycopy(bytes, 1, tmp, 0, tmp.length);
048                bytes = tmp;
049            }
050    
051            ASN1EncodableVector v = new ASN1EncodableVector();
052    
053            v.add(new DERInteger(1));
054            v.add(new DEROctetString(bytes));
055    
056            seq = new DERSequence(v);
057        }
058    
059        public BigInteger getKey()
060        {
061            ASN1OctetString  octs = (ASN1OctetString)seq.getObjectAt(1);
062    
063            BigInteger  k = new BigInteger(1, octs.getOctets());
064    
065            return k;
066        }
067    
068        public DERObject toASN1Object()
069        {
070            return seq;
071        }
072    }