1/* 2 * Copyright (c) 2006, 2013, 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 26package sun.security.ec; 27 28import java.io.IOException; 29 30import java.security.*; 31import java.security.interfaces.*; 32import java.security.spec.*; 33 34import sun.security.util.ECParameters; 35import sun.security.util.ECUtil; 36 37import sun.security.x509.*; 38 39/** 40 * Key implementation for EC public keys. 41 * 42 * @since 1.6 43 * @author Andreas Sterbenz 44 */ 45public final class ECPublicKeyImpl extends X509Key implements ECPublicKey { 46 47 private static final long serialVersionUID = -2462037275160462289L; 48 49 private ECPoint w; 50 private ECParameterSpec params; 51 52 /** 53 * Construct a key from its components. Used by the 54 * ECKeyFactory. 55 */ 56 @SuppressWarnings("deprecation") 57 ECPublicKeyImpl(ECPoint w, ECParameterSpec params) 58 throws InvalidKeyException { 59 this.w = w; 60 this.params = params; 61 // generate the encoding 62 algid = new AlgorithmId 63 (AlgorithmId.EC_oid, ECParameters.getAlgorithmParameters(params)); 64 key = ECUtil.encodePoint(w, params.getCurve()); 65 } 66 67 /** 68 * Construct a key from its encoding. 69 */ 70 ECPublicKeyImpl(byte[] encoded) throws InvalidKeyException { 71 decode(encoded); 72 } 73 74 // see JCA doc 75 public String getAlgorithm() { 76 return "EC"; 77 } 78 79 // see JCA doc 80 public ECPoint getW() { 81 return w; 82 } 83 84 // see JCA doc 85 public ECParameterSpec getParams() { 86 return params; 87 } 88 89 // Internal API to get the encoded point. Currently used by SunPKCS11. 90 // This may change/go away depending on what we do with the public API. 91 @SuppressWarnings("deprecation") 92 public byte[] getEncodedPublicValue() { 93 return key.clone(); 94 } 95 96 /** 97 * Parse the key. Called by X509Key. 98 */ 99 @SuppressWarnings("deprecation") 100 protected void parseKeyBits() throws InvalidKeyException { 101 AlgorithmParameters algParams = this.algid.getParameters(); 102 if (algParams == null) { 103 throw new InvalidKeyException("EC domain parameters must be " + 104 "encoded in the algorithm identifier"); 105 } 106 107 try { 108 params = algParams.getParameterSpec(ECParameterSpec.class); 109 w = ECUtil.decodePoint(key, params.getCurve()); 110 } catch (IOException e) { 111 throw new InvalidKeyException("Invalid EC key", e); 112 } catch (InvalidParameterSpecException e) { 113 throw new InvalidKeyException("Invalid EC key", e); 114 } 115 } 116 117 // return a string representation of this key for debugging 118 public String toString() { 119 return "Sun EC public key, " + params.getCurve().getField().getFieldSize() 120 + " bits\n public x coord: " + w.getAffineX() 121 + "\n public y coord: " + w.getAffineY() 122 + "\n parameters: " + params; 123 } 124 125 protected Object writeReplace() throws java.io.ObjectStreamException { 126 return new KeyRep(KeyRep.Type.PUBLIC, 127 getAlgorithm(), 128 getFormat(), 129 getEncoded()); 130 } 131} 132