| /* |
| * Copyright (c) 1997, 2007, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.crypto.provider; |
| |
| import javax.crypto.ShortBufferException; |
| |
| /** |
| * Padding interface. |
| * |
| * This interface is implemented by general-purpose padding schemes, such as |
| * the one described in PKCS#5. |
| * |
| * @author Jan Luehe |
| * @author Gigi Ankeny |
| * |
| * |
| * @see PKCS5Padding |
| */ |
| |
| interface Padding { |
| |
| /** |
| * Adds the given number of padding bytes to the data input. |
| * The value of the padding bytes is determined |
| * by the specific padding mechanism that implements this |
| * interface. |
| * |
| * @param in the input buffer with the data to pad |
| * @param the offset in <code>in</code> where the padding bytes |
| * are appended |
| * @param len the number of padding bytes to add |
| * |
| * @exception ShortBufferException if <code>in</code> is too small to hold |
| * the padding bytes |
| */ |
| void padWithLen(byte[] in, int off, int len) throws ShortBufferException; |
| |
| /** |
| * Returns the index where padding starts. |
| * |
| * <p>Given a buffer with data and their padding, this method returns the |
| * index where the padding starts. |
| * |
| * @param in the buffer with the data and their padding |
| * @param off the offset in <code>in</code> where the data starts |
| * @param len the length of the data and their padding |
| * |
| * @return the index where the padding starts, or -1 if the input is |
| * not properly padded |
| */ |
| int unpad(byte[] in, int off, int len); |
| |
| /** |
| * Determines how long the padding will be for a given input length. |
| * |
| * @param len the length of the data to pad |
| * |
| * @return the length of the padding |
| */ |
| int padLength(int len); |
| } |