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/*
*
* This file is part of the iText (R) project.
Copyright (c) 1998-2017 iText Group NV
* Authors: Bruno Lowagie, Paulo Soares, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
* ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
* OF THIRD PARTY RIGHTS
*
* This program 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 Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
* address: [email protected]
*/
package com.itextpdf.text.pdf.crypto;
public class ARCFOUREncryption {
private byte state[] = new byte[256];
private int x;
private int y;
/** Creates a new instance of ARCFOUREncryption */
public ARCFOUREncryption() {
}
public void prepareARCFOURKey(byte key[]) {
prepareARCFOURKey(key, 0, key.length);
}
public void prepareARCFOURKey(byte key[], int off, int len) {
int index1 = 0;
int index2 = 0;
for (int k = 0; k < 256; ++k)
state[k] = (byte)k;
x = 0;
y = 0;
byte tmp;
for (int k = 0; k < 256; ++k) {
index2 = (key[index1 + off] + state[k] + index2) & 255;
tmp = state[k];
state[k] = state[index2];
state[index2] = tmp;
index1 = (index1 + 1) % len;
}
}
public void encryptARCFOUR(byte dataIn[], int off, int len, byte dataOut[], int offOut) {
int length = len + off;
byte tmp;
for (int k = off; k < length; ++k) {
x = (x + 1) & 255;
y = (state[x] + y) & 255;
tmp = state[x];
state[x] = state[y];
state[y] = tmp;
dataOut[k - off + offOut] = (byte)(dataIn[k] ^ state[(state[x] + state[y]) & 255]);
}
}
public void encryptARCFOUR(byte data[], int off, int len) {
encryptARCFOUR(data, off, len, data, off);
}
public void encryptARCFOUR(byte dataIn[], byte dataOut[]) {
encryptARCFOUR(dataIn, 0, dataIn.length, dataOut, 0);
}
public void encryptARCFOUR(byte data[]) {
encryptARCFOUR(data, 0, data.length, data, 0);
}
}
