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| 1 | +/* | |
| 2 | + * Copyright (c) 1996, 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 java.security; | |
| 27 | + | |
| 28 | +/** | |
| 29 | + * The Key interface is the top-level interface for all keys. It | |
| 30 | + * defines the functionality shared by all key objects. All keys | |
| 31 | + * have three characteristics: | |
| 32 | + * | |
| 33 | + * <UL> | |
| 34 | + * | |
| 35 | + * <LI>An Algorithm | |
| 36 | + * | |
| 37 | + * <P>This is the key algorithm for that key. The key algorithm is usually | |
| 38 | + * an encryption or asymmetric operation algorithm (such as DSA or | |
| 39 | + * RSA), which will work with those algorithms and with related | |
| 40 | + * algorithms (such as MD5 with RSA, SHA-1 with RSA, Raw DSA, etc.) | |
| 41 | + * The name of the algorithm of a key is obtained using the | |
| 42 | + * {@link #getAlgorithm() getAlgorithm} method.<P> | |
| 43 | + * | |
| 44 | + * <LI>An Encoded Form | |
| 45 | + * | |
| 46 | + * <P>This is an external encoded form for the key used when a standard | |
| 47 | + * representation of the key is needed outside the Java Virtual Machine, | |
| 48 | + * as when transmitting the key to some other party. The key | |
| 49 | + * is encoded according to a standard format (such as | |
| 50 | + * X.509 <code>SubjectPublicKeyInfo</code> or PKCS#8), and | |
| 51 | + * is returned using the {@link #getEncoded() getEncoded} method. | |
| 52 | + * Note: The syntax of the ASN.1 type <code>SubjectPublicKeyInfo</code> | |
| 53 | + * is defined as follows: | |
| 54 | + * | |
| 55 | + * <pre> | |
| 56 | + * SubjectPublicKeyInfo ::= SEQUENCE { | |
| 57 | + * algorithm AlgorithmIdentifier, | |
| 58 | + * subjectPublicKey BIT STRING } | |
| 59 | + * | |
| 60 | + * AlgorithmIdentifier ::= SEQUENCE { | |
| 61 | + * algorithm OBJECT IDENTIFIER, | |
| 62 | + * parameters ANY DEFINED BY algorithm OPTIONAL } | |
| 63 | + * </pre> | |
| 64 | + * | |
| 65 | + * For more information, see | |
| 66 | + * <a href="http://www.ietf.org/rfc/rfc3280.txt">RFC 3280: | |
| 67 | + * Internet X.509 Public Key Infrastructure Certificate and CRL Profile</a>. | |
| 68 | + * <P> | |
| 69 | + * | |
| 70 | + * <LI>A Format | |
| 71 | + * | |
| 72 | + * <P>This is the name of the format of the encoded key. It is returned | |
| 73 | + * by the {@link #getFormat() getFormat} method.<P> | |
| 74 | + * | |
| 75 | + * </UL> | |
| 76 | + * | |
| 77 | + * Keys are generally obtained through key generators, certificates, | |
| 78 | + * or various Identity classes used to manage keys. | |
| 79 | + * Keys may also be obtained from key specifications (transparent | |
| 80 | + * representations of the underlying key material) through the use of a key | |
| 81 | + * factory (see {@link KeyFactory}). | |
| 82 | + * | |
| 83 | + * <p> A Key should use KeyRep as its serialized representation. | |
| 84 | + * Note that a serialized Key may contain sensitive information | |
| 85 | + * which should not be exposed in untrusted environments. See the | |
| 86 | + * <a href="../../../platform/serialization/spec/security.html"> | |
| 87 | + * Security Appendix</a> | |
| 88 | + * of the Serialization Specification for more information. | |
| 89 | + * | |
| 90 | + * @see PublicKey | |
| 91 | + * @see PrivateKey | |
| 92 | + * @see KeyPair | |
| 93 | + * @see KeyPairGenerator | |
| 94 | + * @see KeyFactory | |
| 95 | + * @see KeyRep | |
| 96 | + * @see java.security.spec.KeySpec | |
| 97 | + * @see Identity | |
| 98 | + * @see Signer | |
| 99 | + * | |
| 100 | + * @author Benjamin Renaud | |
| 101 | + */ | |
| 102 | + | |
| 103 | +public interface Key extends java.io.Serializable { | |
| 104 | + | |
| 105 | + // Declare serialVersionUID to be compatible with JDK1.1 | |
| 106 | + | |
| 107 | + /** | |
| 108 | + * The class fingerprint that is set to indicate | |
| 109 | + * serialization compatibility with a previous | |
| 110 | + * version of the class. | |
| 111 | + */ | |
| 112 | + static final long serialVersionUID = 6603384152749567654L; | |
| 113 | + | |
| 114 | + /** | |
| 115 | + * Returns the standard algorithm name for this key. For | |
| 116 | + * example, "DSA" would indicate that this key is a DSA key. | |
| 117 | + * See Appendix A in the <a href= | |
| 118 | + * "../../../technotes/guides/security/crypto/CryptoSpec.html#AppA"> | |
| 119 | + * Java Cryptography Architecture API Specification & Reference </a> | |
| 120 | + * for information about standard algorithm names. | |
| 121 | + * | |
| 122 | + * @return the name of the algorithm associated with this key. | |
| 123 | + */ | |
| 124 | + public String getAlgorithm(); | |
| 125 | + | |
| 126 | + /** | |
| 127 | + * Returns the name of the primary encoding format of this key, | |
| 128 | + * or null if this key does not support encoding. | |
| 129 | + * The primary encoding format is | |
| 130 | + * named in terms of the appropriate ASN.1 data format, if an | |
| 131 | + * ASN.1 specification for this key exists. | |
| 132 | + * For example, the name of the ASN.1 data format for public | |
| 133 | + * keys is <I>SubjectPublicKeyInfo</I>, as | |
| 134 | + * defined by the X.509 standard; in this case, the returned format is | |
| 135 | + * <code>"X.509"</code>. Similarly, | |
| 136 | + * the name of the ASN.1 data format for private keys is | |
| 137 | + * <I>PrivateKeyInfo</I>, | |
| 138 | + * as defined by the PKCS #8 standard; in this case, the returned format is | |
| 139 | + * <code>"PKCS#8"</code>. | |
| 140 | + * | |
| 141 | + * @return the primary encoding format of the key. | |
| 142 | + */ | |
| 143 | + public String getFormat(); | |
| 144 | + | |
| 145 | + /** | |
| 146 | + * Returns the key in its primary encoding format, or null | |
| 147 | + * if this key does not support encoding. | |
| 148 | + * | |
| 149 | + * @return the encoded key, or null if the key does not support | |
| 150 | + * encoding. | |
| 151 | + */ | |
| 152 | + public byte[] getEncoded(); | |
| 153 | +} | |