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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.geronimo.crypto.asn1.sec;
   19   
   20   import java.math.BigInteger;
   21   import org.apache.geronimo.crypto.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  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 getKey()
   59       {
   60           ASN1OctetString  octs = (ASN1OctetString)seq.getObjectAt(1);
   61   
   62           BigInteger  k = new BigInteger(1, octs.getOctets());
   63   
   64           return k;
   65       }
   66   
   67       public DERObject toASN1Object()
   68       {
   69           return seq;
   70       }
   71   }

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