Home | History | Annotate | Download | only in ec 
      1 /*
      2  * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
      3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
      4  *
      5  * This code is free software; you can redistribute it and/or modify it
      6  * under the terms of the GNU General Public License version 2 only, as
      7  * published by the Free Software Foundation.  Oracle designates this
      8  * particular file as subject to the "Classpath" exception as provided
      9  * by Oracle in the LICENSE file that accompanied this code.
     10  *
     11  * This code is distributed in the hope that it will be useful, but WITHOUT
     12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
     13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
     14  * version 2 for more details (a copy is included in the LICENSE file that
     15  * accompanied this code).
     16  *
     17  * You should have received a copy of the GNU General Public License version
     18  * 2 along with this work; if not, write to the Free Software Foundation,
     19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
     20  *
     21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
     22  * or visit www.oracle.com if you need additional information or have any
     23  * questions.
     24  */
     25 
     26 package sun.security.ec;
     27 
     28 import java.io.IOException;
     29 
     30 import java.security.*;
     31 import java.security.interfaces.*;
     32 import java.security.spec.*;
     33 
     34 import sun.security.util.*;
     35 import sun.security.x509.*;
     36 
     37 /**
     38  * Key implementation for EC public keys.
     39  *
     40  * @since   1.6
     41  * @author  Andreas Sterbenz
     42  */
     43 public final class ECPublicKeyImpl extends X509Key implements ECPublicKey {
     44 
     45     private static final long serialVersionUID = -2462037275160462289L;
     46 
     47     private ECPoint w;
     48     private ECParameterSpec params;
     49 
     50     /**
     51      * Construct a key from its components. Used by the
     52      * ECKeyFactory and SunPKCS11.
     53      */
     54     public ECPublicKeyImpl(ECPoint w, ECParameterSpec params)
     55             throws InvalidKeyException {
     56         this.w = w;
     57         this.params = params;
     58         // generate the encoding
     59         algid = new AlgorithmId
     60             (AlgorithmId.EC_oid, ECParameters.getAlgorithmParameters(params));
     61         key = ECParameters.encodePoint(w, params.getCurve());
     62     }
     63 
     64     /**
     65      * Construct a key from its encoding. Used by RSAKeyFactory.
     66      */
     67     public ECPublicKeyImpl(byte[] encoded) throws InvalidKeyException {
     68         decode(encoded);
     69     }
     70 
     71     // see JCA doc
     72     public String getAlgorithm() {
     73         return "EC";
     74     }
     75 
     76     // see JCA doc
     77     public ECPoint getW() {
     78         return w;
     79     }
     80 
     81     // see JCA doc
     82     public ECParameterSpec getParams() {
     83         return params;
     84     }
     85 
     86     // Internal API to get the encoded point. Currently used by SunPKCS11.
     87     // This may change/go away depending on what we do with the public API.
     88     public byte[] getEncodedPublicValue() {
     89         return key.clone();
     90     }
     91 
     92     /**
     93      * Parse the key. Called by X509Key.
     94      */
     95     protected void parseKeyBits() throws InvalidKeyException {
     96         try {
     97             AlgorithmParameters algParams = this.algid.getParameters();
     98             params = algParams.getParameterSpec(ECParameterSpec.class);
     99             w = ECParameters.decodePoint(key, params.getCurve());
    100         } catch (IOException e) {
    101             throw new InvalidKeyException("Invalid EC key", e);
    102         } catch (InvalidParameterSpecException e) {
    103             throw new InvalidKeyException("Invalid EC key", e);
    104         }
    105     }
    106 
    107     // return a string representation of this key for debugging
    108     public String toString() {
    109         return "Sun EC public key, " + params.getCurve().getField().getFieldSize()
    110             + " bits\n  public x coord: " + w.getAffineX()
    111             + "\n  public y coord: " + w.getAffineY()
    112             + "\n  parameters: " + params;
    113     }
    114 
    115     protected Object writeReplace() throws java.io.ObjectStreamException {
    116         return new KeyRep(KeyRep.Type.PUBLIC,
    117                         getAlgorithm(),
    118                         getFormat(),
    119                         getEncoded());
    120     }
    121 }
    122