author | erikj |
Tue, 12 Sep 2017 19:03:39 +0200 | |
changeset 47216 | 71c04702a3d5 |
parent 25859 | jdk/src/java.base/share/classes/javax/crypto/CipherOutputStream.java@3317bb8137f4 |
child 49781 | 21fa027e2e62 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package javax.crypto; |
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import java.io.*; |
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/** |
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* A CipherOutputStream is composed of an OutputStream and a Cipher so |
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* that write() methods first process the data before writing them out |
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* to the underlying OutputStream. The cipher must be fully |
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* initialized before being used by a CipherOutputStream. |
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* |
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* <p> For example, if the cipher is initialized for encryption, the |
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* CipherOutputStream will attempt to encrypt data before writing out the |
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* encrypted data. |
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* |
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* <p> This class adheres strictly to the semantics, especially the |
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* failure semantics, of its ancestor classes |
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* java.io.OutputStream and java.io.FilterOutputStream. This class |
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* has exactly those methods specified in its ancestor classes, and |
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* overrides them all. Moreover, this class catches all exceptions |
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* that are not thrown by its ancestor classes. |
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* |
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* <p> It is crucial for a programmer using this class not to use |
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* methods that are not defined or overriden in this class (such as a |
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* new method or constructor that is later added to one of the super |
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* classes), because the design and implementation of those methods |
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* are unlikely to have considered security impact with regard to |
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* CipherOutputStream. |
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* |
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* @author Li Gong |
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* @see java.io.OutputStream |
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* @see java.io.FilterOutputStream |
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* @see javax.crypto.Cipher |
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* @see javax.crypto.CipherInputStream |
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* |
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* @since 1.4 |
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*/ |
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public class CipherOutputStream extends FilterOutputStream { |
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// the cipher engine to use to process stream data |
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private Cipher cipher; |
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// the underlying output stream |
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private OutputStream output; |
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/* the buffer holding one byte of incoming data */ |
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private byte[] ibuffer = new byte[1]; |
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// the buffer holding data ready to be written out |
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private byte[] obuffer; |
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// stream status |
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private boolean closed = false; |
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/** |
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* |
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* Constructs a CipherOutputStream from an OutputStream and a |
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* Cipher. |
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* <br>Note: if the specified output stream or cipher is |
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* null, a NullPointerException may be thrown later when |
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* they are used. |
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* |
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* @param os the OutputStream object |
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* @param c an initialized Cipher object |
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*/ |
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public CipherOutputStream(OutputStream os, Cipher c) { |
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super(os); |
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output = os; |
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cipher = c; |
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}; |
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/** |
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* Constructs a CipherOutputStream from an OutputStream without |
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* specifying a Cipher. This has the effect of constructing a |
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* CipherOutputStream using a NullCipher. |
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* <br>Note: if the specified output stream is null, a |
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* NullPointerException may be thrown later when it is used. |
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* |
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* @param os the OutputStream object |
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*/ |
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protected CipherOutputStream(OutputStream os) { |
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super(os); |
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output = os; |
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cipher = new NullCipher(); |
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} |
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/** |
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* Writes the specified byte to this output stream. |
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* |
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* @param b the <code>byte</code>. |
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* @exception IOException if an I/O error occurs. |
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*/ |
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public void write(int b) throws IOException { |
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ibuffer[0] = (byte) b; |
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obuffer = cipher.update(ibuffer, 0, 1); |
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if (obuffer != null) { |
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output.write(obuffer); |
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obuffer = null; |
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} |
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}; |
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/** |
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* Writes <code>b.length</code> bytes from the specified byte array |
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* to this output stream. |
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* <p> |
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* The <code>write</code> method of |
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* <code>CipherOutputStream</code> calls the <code>write</code> |
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* method of three arguments with the three arguments |
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* <code>b</code>, <code>0</code>, and <code>b.length</code>. |
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* |
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* @param b the data. |
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* @exception NullPointerException if <code>b</code> is null. |
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* @exception IOException if an I/O error occurs. |
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* @see javax.crypto.CipherOutputStream#write(byte[], int, int) |
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*/ |
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public void write(byte b[]) throws IOException { |
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write(b, 0, b.length); |
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} |
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/** |
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* Writes <code>len</code> bytes from the specified byte array |
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* starting at offset <code>off</code> to this output stream. |
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* |
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* @param b the data. |
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* @param off the start offset in the data. |
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* @param len the number of bytes to write. |
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* @exception IOException if an I/O error occurs. |
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*/ |
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public void write(byte b[], int off, int len) throws IOException { |
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obuffer = cipher.update(b, off, len); |
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if (obuffer != null) { |
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output.write(obuffer); |
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obuffer = null; |
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} |
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} |
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/** |
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* Flushes this output stream by forcing any buffered output bytes |
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* that have already been processed by the encapsulated cipher object |
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* to be written out. |
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* |
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* <p>Any bytes buffered by the encapsulated cipher |
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* and waiting to be processed by it will not be written out. For example, |
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* if the encapsulated cipher is a block cipher, and the total number of |
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* bytes written using one of the <code>write</code> methods is less than |
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* the cipher's block size, no bytes will be written out. |
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* |
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* @exception IOException if an I/O error occurs. |
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*/ |
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public void flush() throws IOException { |
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if (obuffer != null) { |
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output.write(obuffer); |
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obuffer = null; |
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} |
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output.flush(); |
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} |
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/** |
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* Closes this output stream and releases any system resources |
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* associated with this stream. |
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* <p> |
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* This method invokes the <code>doFinal</code> method of the encapsulated |
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* cipher object, which causes any bytes buffered by the encapsulated |
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* cipher to be processed. The result is written out by calling the |
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* <code>flush</code> method of this output stream. |
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* <p> |
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* This method resets the encapsulated cipher object to its initial state |
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* and calls the <code>close</code> method of the underlying output |
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* stream. |
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* |
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* @exception IOException if an I/O error occurs. |
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*/ |
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public void close() throws IOException { |
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if (closed) { |
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return; |
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} |
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closed = true; |
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try { |
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obuffer = cipher.doFinal(); |
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} catch (IllegalBlockSizeException | BadPaddingException e) { |
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obuffer = null; |
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} |
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try { |
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flush(); |
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} catch (IOException ignored) {} |
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out.close(); |
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} |
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} |