diff options
Diffstat (limited to 'src/main/java/org/pdfbox/encryption/ARCFour.java')
| -rw-r--r-- | src/main/java/org/pdfbox/encryption/ARCFour.java | 182 |
1 files changed, 0 insertions, 182 deletions
diff --git a/src/main/java/org/pdfbox/encryption/ARCFour.java b/src/main/java/org/pdfbox/encryption/ARCFour.java deleted file mode 100644 index 6eeeb95..0000000 --- a/src/main/java/org/pdfbox/encryption/ARCFour.java +++ /dev/null @@ -1,182 +0,0 @@ -/**
- * Copyright (c) 2003, www.pdfbox.org
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 3. Neither the name of pdfbox; nor the names of its
- * contributors may be used to endorse or promote products derived from this
- * software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * http://www.pdfbox.org
- *
- */
-package org.pdfbox.encryption;
-
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
-
-/**
- * This class is an implementation of the alleged RC4 algorithm.
- *
- * @author Ben Litchfield
- * @version $Revision: 1.7 $
- */
-public class ARCFour
-{
- private int[] salt;
- private int b;
- private int c;
-
- /**
- * Constructor.
- *
- */
- public ARCFour()
- {
- salt = new int[256];
- }
-
- /**
- * This will reset the key to be used.
- *
- * @param key The RC4 key used during encryption.
- */
- public void setKey( byte[] key )
- {
- b = 0;
- c = 0;
-
- if(key.length < 1 || key.length > 32)
- {
- throw new IllegalArgumentException("number of bytes must be between 1 and 32");
- }
- for(int i = 0; i < salt.length; i++)
- {
- salt[i] = i;
- }
-
- int keyIndex = 0;
- int saltIndex = 0;
- for( int i = 0; i < salt.length; i++)
- {
- saltIndex = (fixByte(key[keyIndex]) + salt[i] + saltIndex) % 256;
- swap( salt, i, saltIndex );
- keyIndex = (keyIndex + 1) % key.length;
- }
-
- }
-
- /**
- * Thie will ensure that the value for a byte >=0.
- *
- * @param aByte The byte to test against.
- *
- * @return A value >=0 and < 256
- */
- private static final int fixByte( byte aByte )
- {
- return aByte < 0 ? 256 + aByte : aByte;
- }
-
- /**
- * This will swap two values in an array.
- *
- * @param data The array to swap from.
- * @param firstIndex The index of the first element to swap.
- * @param secondIndex The index of the second element to swap.
- */
- private static final void swap( int[] data, int firstIndex, int secondIndex )
- {
- int tmp = data[ firstIndex ];
- data[ firstIndex ] = data[ secondIndex ];
- data[ secondIndex ] = tmp;
- }
-
- /**
- * This will encrypt and write the next byte.
- *
- * @param aByte The byte to encrypt.
- * @param output The stream to write to.
- *
- * @throws IOException If there is an error writing to the output stream.
- */
- public void write( byte aByte, OutputStream output ) throws IOException
- {
- b = (b + 1) % 256;
- c = (salt[b] + c) % 256;
- swap( salt, b, c );
- int saltIndex = (salt[b] + salt[c]) % 256;
- output.write(aByte ^ (byte)salt[saltIndex]);
- }
-
- /**
- * This will encrypt and write the data.
- *
- * @param data The data to encrypt.
- * @param output The stream to write to.
- *
- * @throws IOException If there is an error writing to the output stream.
- */
- public void write( byte[] data, OutputStream output ) throws IOException
- {
- for( int i = 0; i < data.length; i++ )
- {
- write( data[i], output );
- }
- }
-
- /**
- * This will encrypt and write the data.
- *
- * @param data The data to encrypt.
- * @param output The stream to write to.
- *
- * @throws IOException If there is an error writing to the output stream.
- */
- public void write( InputStream data, OutputStream output ) throws IOException
- {
- byte[] buffer = new byte[1024];
- int amountRead = 0;
- while( (amountRead = data.read( buffer )) != -1 )
- {
- write( buffer, 0, amountRead, output );
- }
- }
-
- /**
- * This will encrypt and write the data.
- *
- * @param data The data to encrypt.
- * @param offset The offset into the array to start reading data from.
- * @param len The number of bytes to attempt to read.
- * @param output The stream to write to.
- *
- * @throws IOException If there is an error writing to the output stream.
- */
- public void write( byte[] data, int offset, int len, OutputStream output) throws IOException
- {
- for( int i = offset; i < offset + len; i++ )
- {
- write( data[i], output );
- }
- }
-}
\ No newline at end of file |