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| 1 | /* | ||
| 2 | * Copyright (c) 1997, 2007, 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 com.sun.crypto.provider; | ||
| 27 | |||
| 28 | import javax.crypto.ShortBufferException; | ||
| 29 | |||
| 30 | /** | ||
| 31 | * Padding interface. | ||
| 32 | * | ||
| 33 | * This interface is implemented by general-purpose padding schemes, such as | ||
| 34 | * the one described in PKCS#5. | ||
| 35 | * | ||
| 36 | * @author Jan Luehe | ||
| 37 | * @author Gigi Ankeny | ||
| 38 | * | ||
| 39 | * | ||
| 40 | * @see PKCS5Padding | ||
| 41 | */ | ||
| 42 | |||
| 43 | interface Padding { | ||
| 44 | |||
| 45 | /** | ||
| 46 | * Adds the given number of padding bytes to the data input. | ||
| 47 | * The value of the padding bytes is determined | ||
| 48 | * by the specific padding mechanism that implements this | ||
| 49 | * interface. | ||
| 50 | * | ||
| 51 | * @param in the input buffer with the data to pad | ||
| 52 | * @param the offset in <code>in</code> where the padding bytes | ||
| 53 | * are appended | ||
| 54 | * @param len the number of padding bytes to add | ||
| 55 | * | ||
| 56 | * @exception ShortBufferException if <code>in</code> is too small to hold | ||
| 57 | * the padding bytes | ||
| 58 | */ | ||
| 59 | void padWithLen(byte[] in, int off, int len) throws ShortBufferException; | ||
| 60 | |||
| 61 | /** | ||
| 62 | * Returns the index where padding starts. | ||
| 63 | * | ||
| 64 | * <p>Given a buffer with data and their padding, this method returns the | ||
| 65 | * index where the padding starts. | ||
| 66 | * | ||
| 67 | * @param in the buffer with the data and their padding | ||
| 68 | * @param off the offset in <code>in</code> where the data starts | ||
| 69 | * @param len the length of the data and their padding | ||
| 70 | * | ||
| 71 | * @return the index where the padding starts, or -1 if the input is | ||
| 72 | * not properly padded | ||
| 73 | */ | ||
| 74 | int unpad(byte[] in, int off, int len); | ||
| 75 | |||
| 76 | /** | ||
| 77 | * Determines how long the padding will be for a given input length. | ||
| 78 | * | ||
| 79 | * @param len the length of the data to pad | ||
| 80 | * | ||
| 81 | * @return the length of the padding | ||
| 82 | */ | ||
| 83 | int padLength(int len); | ||
| 84 | } | ||