J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * reserved comment block |
| 3 | * DO NOT REMOVE OR ALTER! |
| 4 | */ |
| 5 | /* |
| 6 | * Copyright 1999-2004 The Apache Software Foundation. |
| 7 | * |
| 8 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 9 | * you may not use this file except in compliance with the License. |
| 10 | * You may obtain a copy of the License at |
| 11 | * |
| 12 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 13 | * |
| 14 | * Unless required by applicable law or agreed to in writing, software |
| 15 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 16 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 17 | * See the License for the specific language governing permissions and |
| 18 | * limitations under the License. |
| 19 | * |
| 20 | */ |
| 21 | package com.sun.org.apache.xml.internal.security.keys.keyresolver.implementations; |
| 22 | |
| 23 | import java.security.Key; |
| 24 | import java.security.PublicKey; |
| 25 | import java.security.cert.X509Certificate; |
| 26 | |
| 27 | import javax.crypto.SecretKey; |
| 28 | |
| 29 | import com.sun.org.apache.xml.internal.security.encryption.EncryptedKey; |
| 30 | import com.sun.org.apache.xml.internal.security.encryption.XMLCipher; |
| 31 | import com.sun.org.apache.xml.internal.security.keys.keyresolver.KeyResolverSpi; |
| 32 | import com.sun.org.apache.xml.internal.security.keys.storage.StorageResolver; |
| 33 | import com.sun.org.apache.xml.internal.security.utils.EncryptionConstants; |
| 34 | import com.sun.org.apache.xml.internal.security.utils.XMLUtils; |
| 35 | import org.w3c.dom.Element; |
| 36 | |
| 37 | |
| 38 | /** |
| 39 | * The <code>EncryptedKeyResolver</code> is not a generic resolver. It can |
| 40 | * only be for specific instantiations, as the key being unwrapped will |
| 41 | * always be of a particular type and will always have been wrapped by |
| 42 | * another key which needs to be recursively resolved. |
| 43 | * |
| 44 | * The <code>EncryptedKeyResolver</code> can therefore only be instantiated |
| 45 | * with an algorithm. It can also be instantiated with a key (the KEK) or |
| 46 | * will search the static KeyResolvers to find the appropriate key. |
| 47 | * |
| 48 | * @author Berin Lautenbach |
| 49 | */ |
| 50 | |
| 51 | public class EncryptedKeyResolver extends KeyResolverSpi { |
| 52 | |
| 53 | /** {@link java.util.logging} logging facility */ |
| 54 | static java.util.logging.Logger log = |
| 55 | java.util.logging.Logger.getLogger( |
| 56 | RSAKeyValueResolver.class.getName()); |
| 57 | |
| 58 | |
| 59 | Key _key; |
| 60 | Key _kek; |
| 61 | String _algorithm; |
| 62 | |
| 63 | /** |
| 64 | * Constructor for use when a KEK needs to be derived from a KeyInfo |
| 65 | * list |
| 66 | * @param algorithm |
| 67 | */ |
| 68 | public EncryptedKeyResolver(String algorithm) { |
| 69 | _key = null; |
| 70 | _kek = null; |
| 71 | _algorithm=algorithm; |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * Constructor used for when a KEK has been set |
| 76 | * @param algorithm |
| 77 | * @param kek |
| 78 | */ |
| 79 | |
| 80 | public EncryptedKeyResolver(String algorithm, Key kek) { |
| 81 | _key = null; |
| 82 | _algorithm = algorithm; |
| 83 | _kek = kek; |
| 84 | |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * Method engineCanResolve |
| 89 | * |
| 90 | * @param element |
| 91 | * @param BaseURI |
| 92 | * @param storage |
| 93 | * @return true if can resolve the key in the element |
| 94 | * |
| 95 | */ |
| 96 | |
| 97 | public boolean engineCanResolve(Element element, String BaseURI, |
| 98 | StorageResolver storage) { |
| 99 | if (true) |
| 100 | if (log.isLoggable(java.util.logging.Level.FINE)) log.log(java.util.logging.Level.FINE, "EncryptedKeyResolver - Can I resolve " + element.getTagName()); |
| 101 | |
| 102 | if (element == null) { |
| 103 | return false; |
| 104 | } |
| 105 | |
| 106 | boolean isEncryptedKey = XMLUtils.elementIsInEncryptionSpace(element, |
| 107 | EncryptionConstants._TAG_ENCRYPTEDKEY); |
| 108 | |
| 109 | if (isEncryptedKey) { |
| 110 | if (log.isLoggable(java.util.logging.Level.FINE)) log.log(java.util.logging.Level.FINE, "Passed an Encrypted Key"); |
| 111 | try { |
| 112 | XMLCipher cipher = XMLCipher.getInstance(); |
| 113 | cipher.init(XMLCipher.UNWRAP_MODE, _kek); |
| 114 | EncryptedKey ek = cipher.loadEncryptedKey(element); |
| 115 | _key = cipher.decryptKey(ek, _algorithm); |
| 116 | } |
| 117 | catch (Exception e) {} |
| 118 | } |
| 119 | |
| 120 | return (_key != null); |
| 121 | } |
| 122 | |
| 123 | /** @inheritDoc */ |
| 124 | public PublicKey engineResolvePublicKey( |
| 125 | Element element, String BaseURI, StorageResolver storage) { |
| 126 | |
| 127 | return null; |
| 128 | } |
| 129 | |
| 130 | /** @inheritDoc */ |
| 131 | public X509Certificate engineResolveX509Certificate( |
| 132 | Element element, String BaseURI, StorageResolver storage) { |
| 133 | return null; |
| 134 | } |
| 135 | |
| 136 | /** @inheritDoc */ |
| 137 | public javax.crypto.SecretKey engineResolveSecretKey( |
| 138 | Element element, String BaseURI, StorageResolver storage) { |
| 139 | return (SecretKey) _key; |
| 140 | } |
| 141 | } |