com.itextpdf.text.pdf.crypto.AESCipherCBCnoPad Maven / Gradle / Ivy
/*
* $Id: e7bef37f430ed34fcce0d44ee9938fd1b2ed0a27 $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2016 iText Group NV
* Authors: Bruno Lowagie, Paulo Soares, et al.
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package com.itextpdf.text.pdf.crypto;
import org.spongycastle.crypto.BlockCipher;
import org.spongycastle.crypto.engines.AESFastEngine;
import org.spongycastle.crypto.modes.CBCBlockCipher;
import org.spongycastle.crypto.params.KeyParameter;
/**
* Creates an AES Cipher with CBC and no padding.
* @author Paulo Soares
*/
public class AESCipherCBCnoPad {
private BlockCipher cbc;
/** Creates a new instance of AESCipher */
public AESCipherCBCnoPad(boolean forEncryption, byte[] key) {
BlockCipher aes = new AESFastEngine();
cbc = new CBCBlockCipher(aes);
KeyParameter kp = new KeyParameter(key);
cbc.init(forEncryption, kp);
}
public byte[] processBlock(byte[] inp, int inpOff, int inpLen) {
if ((inpLen % cbc.getBlockSize()) != 0)
throw new IllegalArgumentException("Not multiple of block: " + inpLen);
byte[] outp = new byte[inpLen];
int baseOffset = 0;
while (inpLen > 0) {
cbc.processBlock(inp, inpOff, outp, baseOffset);
inpLen -= cbc.getBlockSize();
baseOffset += cbc.getBlockSize();
inpOff += cbc.getBlockSize();
}
return outp;
}
}