| /* CipherOutputStream.java -- Filters output 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 java.io.FilterOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| /** |
| * A filtered output stream that transforms data written to it with a |
| * {@link Cipher} before sending it to the underlying output stream. |
| * |
| * @author Casey Marshall (csm@gnu.org) |
| */ |
| public class CipherOutputStream extends FilterOutputStream |
| { |
| /** The underlying cipher. */ |
| private Cipher cipher; |
| |
| /** |
| * Create a new cipher output stream. The cipher argument must have already |
| * been initialized. |
| * |
| * @param out The sink for transformed data. |
| * @param cipher The cipher to transform data with. |
| */ |
| public CipherOutputStream(OutputStream out, Cipher cipher) |
| { |
| super(out); |
| this.cipher = (cipher != null) ? cipher : new NullCipher(); |
| } |
| |
| /** |
| * Create a cipher output stream with no cipher. |
| * |
| * @param out The sink for transformed data. |
| */ |
| protected CipherOutputStream(OutputStream out) |
| { |
| super(out); |
| } |
| |
| /** |
| * Close this output stream, and the sink output stream. |
| * <p> |
| * This method will first invoke the {@link Cipher#doFinal()} method of the |
| * underlying {@link Cipher}, and writes the output of that method to the |
| * sink output stream. |
| * |
| * @throws IOException If an I/O error occurs, or if an error is caused by |
| * finalizing the transformation. |
| */ |
| public void close() throws IOException |
| { |
| try |
| { |
| out.write(cipher.doFinal()); |
| out.flush(); |
| out.close(); |
| } |
| catch (Exception cause) |
| { |
| IOException ioex = new IOException(String.valueOf(cause)); |
| ioex.initCause(cause); |
| throw ioex; |
| } |
| } |
| |
| /** |
| * Flush any pending output. |
| * |
| * @throws IOException If an I/O error occurs. |
| */ |
| public void flush() throws IOException |
| { |
| out.flush(); |
| } |
| |
| /** |
| * Write a single byte to the output stream. |
| * |
| * @param b The next byte. |
| * @throws IOException If an I/O error occurs, or if the underlying cipher is |
| * not in the correct state to transform data. |
| */ |
| public void write(int b) throws IOException |
| { |
| write(new byte[] { (byte) b }, 0, 1); |
| } |
| |
| /** |
| * Write a byte array to the output stream. |
| * |
| * @param buf The next bytes. |
| * @throws IOException If an I/O error occurs, or if the underlying cipher is |
| * not in the correct state to transform data. |
| */ |
| public void write(byte[] buf) throws IOException |
| { |
| write(buf, 0, buf.length); |
| } |
| |
| /** |
| * Write a portion of a byte array to the output stream. |
| * |
| * @param buf The next bytes. |
| * @param off The offset in the byte array to start. |
| * @param len The number of bytes to write. |
| * @throws IOException If an I/O error occurs, or if the underlying cipher is |
| * not in the correct state to transform data. |
| */ |
| public void write(byte[] buf, int off, int len) throws IOException |
| { |
| out.write(cipher.update(buf, off, len)); |
| } |
| } |