encryption.ThreefishBouncyCastle.java Source code

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Here is the source code for encryption.ThreefishBouncyCastle.java

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/*
 Copyright 2015 Philipp Adam, Manuel Caspari, Nicolas Lukaschek
 contact@ravenapp.org
    
 This file is part of Raven.
    
 Raven 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 3 of the License, or
 (at your option) any later version.
    
 Raven 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 Raven. If not, see <http://www.gnu.org/licenses/>.
    
*/

package encryption;

import org.bouncycastle.crypto.BlockCipher;
import org.bouncycastle.crypto.DataLengthException;
import org.bouncycastle.crypto.InvalidCipherTextException;
import org.bouncycastle.crypto.engines.ThreefishEngine;
import org.bouncycastle.crypto.paddings.PKCS7Padding;
import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher;
import org.bouncycastle.crypto.params.KeyParameter;

public class ThreefishBouncyCastle {

    private final static BlockCipher ThreefishCipher = new ThreefishEngine(256);

    private static PaddedBufferedBlockCipher pbbc;
    private static KeyParameter key;

    public static byte[] encrypt(byte[] key, byte[] input) throws DataLengthException, InvalidCipherTextException {
        pbbc = new PaddedBufferedBlockCipher(ThreefishCipher, new PKCS7Padding());
        ThreefishBouncyCastle.key = new KeyParameter(key);
        return processing(input, true);
    }

    public static byte[] decrypt(byte[] key, byte[] input) throws DataLengthException, InvalidCipherTextException {
        pbbc = new PaddedBufferedBlockCipher(ThreefishCipher, new PKCS7Padding());
        ThreefishBouncyCastle.key = new KeyParameter(key);
        return processing(input, false);
    }

    private static byte[] processing(byte[] input, boolean encrypt)
            throws DataLengthException, InvalidCipherTextException {

        pbbc.init(encrypt, key);

        byte[] output = new byte[pbbc.getOutputSize(input.length)];
        int bytesWrittenOut = pbbc.processBytes(input, 0, input.length, output, 0);

        pbbc.doFinal(output, bytesWrittenOut);

        return output;

    }

}