From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- .../classpath/gnu/javax/crypto/pad/BasePad.java | 193 +++++++++++++++++++++ 1 file changed, 193 insertions(+) create mode 100644 libjava/classpath/gnu/javax/crypto/pad/BasePad.java (limited to 'libjava/classpath/gnu/javax/crypto/pad/BasePad.java') diff --git a/libjava/classpath/gnu/javax/crypto/pad/BasePad.java b/libjava/classpath/gnu/javax/crypto/pad/BasePad.java new file mode 100644 index 000000000..feeaca2f0 --- /dev/null +++ b/libjava/classpath/gnu/javax/crypto/pad/BasePad.java @@ -0,0 +1,193 @@ +/* BasePad.java -- + Copyright (C) 2001, 2002, 2003, 2006 Free Software Foundation, Inc. + +This file is a part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2 of the License, or (at +your option) any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; if not, write to the Free Software +Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 +USA + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package gnu.javax.crypto.pad; + +import gnu.java.lang.CPStringBuilder; + +import gnu.java.security.Configuration; + +import java.util.Map; +import java.util.logging.Level; +import java.util.logging.Logger; + +/** + * An abstract class to facilitate implementing padding algorithms. + */ +public abstract class BasePad + implements IPad +{ + private static final Logger log = Logger.getLogger(BasePad.class.getName()); + /** The canonical name prefix of the padding algorithm. */ + protected String name; + /** The block size, in bytes, for this instance. */ + protected int blockSize; + + /** Trivial constructor for use by concrete subclasses. */ + protected BasePad(final String name) + { + super(); + + this.name = name; + blockSize = -1; + } + + public String name() + { + final CPStringBuilder sb = new CPStringBuilder(name); + if (blockSize != -1) + sb.append('-').append(String.valueOf(8 * blockSize)); + return sb.toString(); + } + + public void init(final int bs) throws IllegalStateException + { + if (blockSize != -1) + throw new IllegalStateException(); + blockSize = bs; + setup(); + } + + /** + * Initialises the algorithm with designated attributes. Names, valid and/or + * recognisable by all concrete implementations are described in {@link IPad} + * class documentation. Other algorithm-specific attributes MUST be documented + * in the implementation class of that padding algorithm. + *

+ * For compatibility reasons, this method is not declared abstract. + * Furthermore, and unless overridden, the default implementation will throw + * an {@link UnsupportedOperationException}. Concrete padding algorithms MUST + * override this method if they wish to offer an initialisation method that + * allows for other than the padding block size parameter to be specified. + * + * @param attributes a set of name-value pairs that describes the desired + * future behaviour of this instance. + * @exception IllegalStateException if the instance is already initialised. + * @exception IllegalArgumentException if the block size value is invalid. + */ + public void init(Map attributes) throws IllegalStateException + { + throw new UnsupportedOperationException(); + } + + public void reset() + { + blockSize = -1; + } + + /** + * A default implementation of a correctness test that exercises the padder + * implementation, using block sizes varying from 2 to 256 bytes. + * + * @return true if the concrete implementation correctly unpads + * what it pads for all tested block sizes. Returns false + * if the test fails for any block size. + */ + public boolean selfTest() + { + final byte[] in = new byte[1024]; + for (int bs = 2; bs < 256; bs++) + if (! test1BlockSize(bs, in)) + return false; + return true; + } + + /** + * The basic symmetric test for a padder given a specific block size. + *

+ * The code ensures that the implementation is capable of unpadding what it + * pads. + * + * @param size the block size to test. + * @param buffer a work buffer. It is exposed as an argument for this method + * to reduce un-necessary object allocations. + * @return true if the test passes; false + * otherwise. + */ + protected boolean test1BlockSize(int size, byte[] buffer) + { + byte[] padBytes; + final int offset = 5; + final int limit = buffer.length; + this.init(size); + for (int i = 0; i < limit - offset - blockSize; i++) + { + padBytes = pad(buffer, offset, i); + if (((i + padBytes.length) % blockSize) != 0) + { + if (Configuration.DEBUG) + log.log(Level.SEVERE, + "Length of padded text MUST be a multiple of " + + blockSize, new RuntimeException(name())); + return false; + } + System.arraycopy(padBytes, 0, buffer, offset + i, padBytes.length); + try + { + if (padBytes.length != unpad(buffer, offset, i + padBytes.length)) + { + if (Configuration.DEBUG) + log.log(Level.SEVERE, + "IPad [" + name() + "] failed symmetric operation", + new RuntimeException(name())); + return false; + } + } + catch (WrongPaddingException x) + { + if (Configuration.DEBUG) + log.throwing(this.getClass().getName(), "test1BlockSize", x); + return false; + } + } + this.reset(); + return true; + } + + /** + * If any additional checks or resource setup must be done by the subclass, + * then this is the hook for it. This method will be called before the + * {@link #init(int)} method returns. + */ + public abstract void setup(); + + public abstract byte[] pad(byte[] in, int off, int len); + + public abstract int unpad(byte[] in, int off, int len) + throws WrongPaddingException; +} -- cgit v1.2.3