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1 package org.apache.java.security; 2 3 /* ==================================================================== 4 * The Apache Software License, Version 1.1 5 * 6 * Copyright (c) 2001 The Apache Software Foundation. All rights 7 * reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. The end-user documentation included with the redistribution, 22 * if any, must include the following acknowledgment: 23 * "This product includes software developed by the 24 * Apache Software Foundation (http://www.apache.org/)." 25 * Alternately, this acknowledgment may appear in the software itself, 26 * if and wherever such third-party acknowledgments normally appear. 27 * 28 * 4. The names "Apache" and "Apache Software Foundation" and 29 * "Apache Turbine" must not be used to endorse or promote products 30 * derived from this software without prior written permission. For 31 * written permission, please contact apache@apache.org. 32 * 33 * 5. Products derived from this software may not be called "Apache", 34 * "Apache Turbine", nor may "Apache" appear in their name, without 35 * prior written permission of the Apache Software Foundation. 36 * 37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 48 * SUCH DAMAGE. 49 * ==================================================================== 50 * 51 * This software consists of voluntary contributions made by many 52 * individuals on behalf of the Apache Software Foundation. For more 53 * information on the Apache Software Foundation, please see 54 * <http://www.apache.org/>;. 55 */ 56 57 /*** 58 * This interface abstracts a message digest algorithm. 59 * 60 * <p><b>Note:</b> even if standard Java 1.1 APIs already provide a 61 * message digest implementation, this class is used on those Java 62 * runtime environments (like Kaffe) where the package 63 * <code>java.security</code> is highly improbable to be found. 64 * 65 * @author <a href="mailto:mazzocchi@mbox.systemy.it">Stefano Mazzocchi</a> 66 * @version $Id: MessageDigest.java,v 1.1.1.1 2001/08/16 05:08:27 jvanzyl Exp $ 67 */ 68 public abstract class MessageDigest 69 { 70 /*** 71 * Creates the algorithm and reset its state. 72 */ 73 public MessageDigest() 74 { 75 this.reset(); 76 } 77 78 /*** 79 * Append another block to the message. 80 * 81 * @param block A byte[]. 82 */ 83 public void append(byte[] block) 84 { 85 this.append(block, 0, block.length); 86 } 87 88 /*** 89 * Append another block of specified length to the message. 90 * 91 * @param block A byte[]. 92 * @param length An int. 93 */ 94 public void append(byte[] block, 95 int length) 96 { 97 this.append(block, 0, length); 98 } 99 100 /*** 101 * Append another block of specified length to the message 102 * starting at the given offset. 103 * 104 * @param block A byte[]. 105 * @param offset An int. 106 * @param length An int. 107 */ 108 public abstract void append(byte[] block, 109 int offset, 110 int length); 111 112 /*** 113 * Appends a message block and return its message digest. 114 * 115 * @param block A byte[]. 116 * @return A byte[]. 117 */ 118 public byte[] digest(byte[] block) 119 { 120 return this.digest(block, 0, block.length); 121 } 122 123 /*** 124 * Appends a message block with specified length and return its 125 * message digest. 126 * 127 * @param block A byte[]. 128 * @param length An int. 129 * @return A byte[]. 130 */ 131 public byte[] digest(byte[] block, 132 int length) 133 { 134 return this.digest(block, 0, length); 135 } 136 137 /*** 138 * Appends a message block with specified length starting from the 139 * given offset and return its message digest. 140 * 141 * @param block A byte[]. 142 * @param offset An int. 143 * @param length An int. 144 * @return A byte[]. 145 */ 146 public abstract byte[] digest(byte[] block, 147 int offset, 148 int length); 149 150 /*** 151 * Resets the state of the class. <b>Beware</b>: calling this 152 * method erases all data previously inserted. 153 */ 154 public abstract void reset(); 155 }

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