1 /* 2 * Copyright (c) 1997, 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 26 27 package javax.security.cert; 28 29 import java.security.PublicKey; 30 import java.security.NoSuchAlgorithmException; 31 import java.security.NoSuchProviderException; 32 import java.security.InvalidKeyException; 33 import java.security.SignatureException; 34 35 /** 36 * <p>Abstract class for managing a variety of identity certificates. 37 * An identity certificate is a guarantee by a principal that 38 * a public key is that of another principal. (A principal represents 39 * an entity such as an individual user, a group, or a corporation.) 40 *<p> 41 * This class is an abstraction for certificates that have different 42 * formats but important common uses. For example, different types of 43 * certificates, such as X.509 and PGP, share general certificate 44 * functionality (like encoding and verifying) and 45 * some types of information (like a public key). 46 * <p> 47 * X.509, PGP, and SDSI certificates can all be implemented by 48 * subclassing the Certificate class, even though they contain different 49 * sets of information, and they store and retrieve the information in 50 * different ways. 51 * 52 * <p><em>Note: The classes in the package {@code javax.security.cert} 53 * exist for compatibility with earlier versions of the 54 * Java Secure Sockets Extension (JSSE). New applications should instead 55 * use the standard Java SE certificate classes located in 56 * {@code java.security.cert}.</em></p> 57 * 58 * @since 1.4 59 * @see X509Certificate 60 * 61 * @author Hemma Prafullchandra 62 */ 63 public abstract class Certificate { 64 65 /** 66 * Compares this certificate for equality with the specified 67 * object. If the {@code other} object is an 68 * {@code instanceof} {@code Certificate}, then 69 * its encoded form is retrieved and compared with the 70 * encoded form of this certificate. 71 * 72 * @param other the object to test for equality with this certificate. 73 * @return true if the encoded forms of the two certificates 74 * match, false otherwise. 75 */ 76 public boolean equals(Object other) { 77 if (this == other) 78 return true; 79 if (!(other instanceof Certificate)) 80 return false; 81 try { 82 byte[] thisCert = this.getEncoded(); 83 byte[] otherCert = ((Certificate)other).getEncoded(); 84 85 if (thisCert.length != otherCert.length) 86 return false; 87 for (int i = 0; i < thisCert.length; i++) 88 if (thisCert[i] != otherCert[i]) 89 return false; 90 return true; 91 } catch (CertificateException e) { 92 return false; 93 } 94 } 95 96 /** 97 * Returns a hashcode value for this certificate from its 98 * encoded form. 99 * 100 * @return the hashcode value. 101 */ 102 public int hashCode() { 103 int retval = 0; 104 try { 105 byte[] certData = this.getEncoded(); 106 for (int i = 1; i < certData.length; i++) { 107 retval += certData[i] * i; 108 } 109 return (retval); 110 } catch (CertificateException e) { 111 return (retval); 112 } 113 } 114 115 /** 116 * Returns the encoded form of this certificate. It is 117 * assumed that each certificate type would have only a single 118 * form of encoding; for example, X.509 certificates would 119 * be encoded as ASN.1 DER. 120 * 121 * @return encoded form of this certificate 122 * @exception CertificateEncodingException on internal certificate 123 * encoding failure 124 */ 125 public abstract byte[] getEncoded() throws CertificateEncodingException; 126 127 /** 128 * Verifies that this certificate was signed using the 129 * private key that corresponds to the specified public key. 130 * 131 * @param key the PublicKey used to carry out the verification. 132 * 133 * @exception NoSuchAlgorithmException on unsupported signature 134 * algorithms. 135 * @exception InvalidKeyException on incorrect key. 136 * @exception NoSuchProviderException if there's no default provider. 137 * @exception SignatureException on signature errors. 138 * @exception CertificateException on encoding errors. 139 */ 140 public abstract void verify(PublicKey key) 141 throws CertificateException, NoSuchAlgorithmException, 142 InvalidKeyException, NoSuchProviderException, 143 SignatureException; 144 145 /** 146 * Verifies that this certificate was signed using the 147 * private key that corresponds to the specified public key. 148 * This method uses the signature verification engine 149 * supplied by the specified provider. 150 * 151 * @param key the PublicKey used to carry out the verification. 152 * @param sigProvider the name of the signature provider. 153 * @exception NoSuchAlgorithmException on unsupported signature algorithms. 154 * @exception InvalidKeyException on incorrect key. 155 * @exception NoSuchProviderException on incorrect provider. 156 * @exception SignatureException on signature errors. 157 * @exception CertificateException on encoding errors. 158 */ 159 public abstract void verify(PublicKey key, String sigProvider) 160 throws CertificateException, NoSuchAlgorithmException, 161 InvalidKeyException, NoSuchProviderException, 162 SignatureException; 163 164 /** 165 * Returns a string representation of this certificate. 166 * 167 * @return a string representation of this certificate. 168 */ 169 public abstract String toString(); 170 171 /** 172 * Gets the public key from this certificate. 173 * 174 * @return the public key. 175 */ 176 public abstract PublicKey getPublicKey(); 177 } 178
