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/javax/crypto/CipherInputStream.java | 368 +++++++++++++++++++++ 1 file changed, 368 insertions(+) create mode 100644 libjava/classpath/javax/crypto/CipherInputStream.java (limited to 'libjava/classpath/javax/crypto/CipherInputStream.java') diff --git a/libjava/classpath/javax/crypto/CipherInputStream.java b/libjava/classpath/javax/crypto/CipherInputStream.java new file mode 100644 index 000000000..dff7edcf1 --- /dev/null +++ b/libjava/classpath/javax/crypto/CipherInputStream.java @@ -0,0 +1,368 @@ +/* CipherInputStream.java -- Filters input through a cipher. + Copyright (C) 2004 Free Software Foundation, Inc. + +This file is 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, 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; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, 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 javax.crypto; + +import gnu.classpath.Configuration; +import gnu.classpath.debug.Component; +import gnu.classpath.debug.SystemLogger; + +import java.io.FilterInputStream; +import java.io.IOException; +import java.io.InputStream; + +import java.util.logging.Logger; + +/** + * This is an {@link java.io.InputStream} that filters its data + * through a {@link Cipher} before returning it. The Cipher + * argument must have been initialized before it is passed to the + * constructor. + * + * @author Casey Marshall (csm@gnu.org) + */ +public class CipherInputStream extends FilterInputStream +{ + + // Constants and variables. + // ------------------------------------------------------------------------ + + private static final Logger logger = SystemLogger.SYSTEM; + + /** + * The underlying {@link Cipher} instance. + */ + private final Cipher cipher; + + /** + * Data that has been transformed but not read. + */ + private byte[] outBuffer; + + /** + * The offset into {@link #outBuffer} where valid data starts. + */ + private int outOffset; + + /** + * We set this when the cipher block size is 1, meaning that we can + * transform any amount of data. + */ + private final boolean isStream; + + /** + * Whether or not we've reached the end of the stream. + */ + private boolean eof; + + // Constructors. + // ------------------------------------------------------------------------ + + /** + * Creates a new input stream with a source input stream and cipher. + * + * @param in The underlying input stream. + * @param cipher The cipher to filter data through. + */ + public CipherInputStream(InputStream in, Cipher cipher) + { + super (in); + this.cipher = cipher; + isStream = cipher.getBlockSize () == 1; + eof = false; + if (Configuration.DEBUG) + logger.log (Component.CRYPTO, "I am born; cipher: {0}, stream? {1}", + new Object[] { cipher.getAlgorithm (), + Boolean.valueOf (isStream) }); + } + + /** + * Creates a new input stream without a cipher. This constructor is + * protected because this class does not work without an + * underlying cipher. + * + * @param in The underlying input stream. + */ + protected CipherInputStream(InputStream in) + { + this (in, new NullCipher ()); + } + + // Instance methods overriding java.io.FilterInputStream. + // ------------------------------------------------------------------------ + + /** + * Returns the number of bytes available without blocking. The value + * returned is the number of bytes that have been processed by the + * cipher, and which are currently buffered by this class. + * + * @return The number of bytes immediately available. + * @throws java.io.IOException If an I/O exception occurs. + */ + public int available() throws IOException + { + if (isStream) + return super.available(); + if (outBuffer == null || outOffset >= outBuffer.length) + nextBlock (); + return outBuffer.length - outOffset; + } + + /** + * Close this input stream. This method merely calls the {@link + * java.io.InputStream#close()} method of the underlying input stream. + * + * @throws java.io.IOException If an I/O exception occurs. + */ + public synchronized void close() throws IOException + { + super.close(); + } + + /** + * Read a single byte from this input stream; returns -1 on the + * end-of-file. + * + * @return The byte read, or -1 if there are no more bytes. + * @throws java.io.IOExcpetion If an I/O exception occurs. + */ + public synchronized int read() throws IOException + { + if (isStream) + { + byte[] buf = new byte[1]; + int in = super.read(); + if (in == -1) + return -1; + buf[0] = (byte) in; + try + { + cipher.update(buf, 0, 1, buf, 0); + } + catch (ShortBufferException shouldNotHappen) + { + throw new IOException(shouldNotHappen.getMessage()); + } + return buf[0] & 0xFF; + } + + if (outBuffer == null || outOffset == outBuffer.length) + { + if (eof) + return -1; + nextBlock (); + } + return outBuffer [outOffset++] & 0xFF; + } + + /** + * Read bytes into an array, returning the number of bytes read or -1 + * on the end-of-file. + * + * @param buf The byte array to read into. + * @param off The offset in buf to start. + * @param len The maximum number of bytes to read. + * @return The number of bytes read, or -1 on the end-of-file. + * @throws java.io.IOException If an I/O exception occurs. + */ + public synchronized int read(byte[] buf, int off, int len) + throws IOException + { + // CipherInputStream has this wierd implementation where if + // the buffer is null, this call is the same as `skip'. + if (buf == null) + return (int) skip (len); + + if (isStream) + { + len = super.read(buf, off, len); + if (len > 0) + { + try + { + cipher.update(buf, off, len, buf, off); + } + catch (ShortBufferException shouldNotHappen) + { + IOException ioe = new IOException ("Short buffer for stream cipher -- this should not happen"); + ioe.initCause (shouldNotHappen); + throw ioe; + } + } + return len; + } + + int count = 0; + while (count < len) + { + if (outBuffer == null || outOffset >= outBuffer.length) + { + if (eof) + { + if (count == 0) + count = -1; + break; + } + nextBlock(); + } + int l = Math.min (outBuffer.length - outOffset, len - count); + System.arraycopy (outBuffer, outOffset, buf, count+off, l); + count += l; + outOffset += l; + } + return count; + } + + /** + * Read bytes into an array, returning the number of bytes read or -1 + * on the end-of-file. + * + * @param buf The byte arry to read into. + * @return The number of bytes read, or -1 on the end-of-file. + * @throws java.io.IOException If an I/O exception occurs. + */ + public int read(byte[] buf) throws IOException + { + return read(buf, 0, buf.length); + } + + /** + * Skip a number of bytes. This class only supports skipping as many + * bytes as are returned by {@link #available()}, which is the number + * of transformed bytes currently in this class's internal buffer. + * + * @param bytes The number of bytes to skip. + * @return The number of bytes skipped. + */ + public long skip(long bytes) throws IOException + { + if (isStream) + { + return super.skip(bytes); + } + long ret = 0; + if (bytes > 0 && outBuffer != null && outOffset >= outBuffer.length) + { + ret = outBuffer.length - outOffset; + outOffset = outBuffer.length; + } + return ret; + } + + /** + * Returns whether or not this input stream supports the {@link + * #mark(long)} and {@link #reset()} methods; this input stream does + * not, however, and invariably returns false. + * + * @return false + */ + public boolean markSupported() + { + return false; + } + + /** + * Set the mark. This method is unsupported and is empty. + * + * @param mark Is ignored. + */ + public void mark(int mark) + { + } + + /** + * Reset to the mark. This method is unsupported and is empty. + */ + public void reset() throws IOException + { + throw new IOException("reset not supported"); + } + + // Own methods. + // ------------------------------------------------------------------------- + + // FIXME: I don't fully understand how this class is supposed to work. + + private void nextBlock() throws IOException + { + byte[] buf = new byte[cipher.getBlockSize ()]; + if (Configuration.DEBUG) + logger.log (Component.CRYPTO, "getting a new data block"); + + try + { + outBuffer = null; + outOffset = 0; + while (outBuffer == null) + { + int l = in.read (buf); + if (Configuration.DEBUG) + logger.log (Component.CRYPTO, "we read {0} bytes", + Integer.valueOf (l)); + if (l == -1) + { + outBuffer = cipher.doFinal (); + eof = true; + return; + } + + outOffset = 0; + outBuffer = cipher.update (buf, 0, l); + } + } + catch (BadPaddingException bpe) + { + IOException ioe = new IOException ("bad padding"); + ioe.initCause (bpe); + throw ioe; + } + catch (IllegalBlockSizeException ibse) + { + IOException ioe = new IOException ("illegal block size"); + ioe.initCause (ibse); + throw ioe; + } + finally + { + if (Configuration.DEBUG) + logger.log (Component.CRYPTO, + "decrypted {0} bytes for reading", + Integer.valueOf (outBuffer.length)); + } + } +} -- cgit v1.2.3