com.keepassdroid.crypto.CipherFactory.java Source code

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Here is the source code for com.keepassdroid.crypto.CipherFactory.java

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/*
 * Copyright 2010-2013 Brian Pellin.
 *     
 * This file is part of KeePassDroid.
 *
 *  KeePassDroid 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 of the License, or
 *  (at your option) any later version.
 *
 *  KeePassDroid 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 KeePassDroid.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
package com.keepassdroid.crypto;

import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.UUID;

import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import org.bouncycastle.jce.provider.BouncyCastleProvider;

import com.keepassdroid.utils.Types;

public class CipherFactory {
    private static boolean blacklistInit = false;
    private static boolean blacklisted;

    public static Cipher getInstance(String transformation)
            throws NoSuchAlgorithmException, NoSuchPaddingException {
        return getInstance(transformation, false);
    }

    public static Cipher getInstance(String transformation, boolean androidOverride)
            throws NoSuchAlgorithmException, NoSuchPaddingException {
        try {
            return Cipher.getInstance(transformation, new BouncyCastleProvider());
        } catch (NoSuchAlgorithmException e) {
            // Do nothing, fall through
        } catch (NoSuchPaddingException e) {
            // Do nothing, fall through
        }
        return Cipher.getInstance(transformation);
    }

    public static final UUID AES_CIPHER = Types.bytestoUUID(new byte[] { (byte) 0x31, (byte) 0xC1, (byte) 0xF2,
            (byte) 0xE6, (byte) 0xBF, (byte) 0x71, (byte) 0x43, (byte) 0x50, (byte) 0xBE, (byte) 0x58, (byte) 0x05,
            (byte) 0x21, (byte) 0x6A, (byte) 0xFC, 0x5A, (byte) 0xFF });

    /** Generate appropriate cipher based on KeePass 2.x UUID's
     * @param uuid
     * @return
     * @throws NoSuchPaddingException 
     * @throws NoSuchAlgorithmException 
     * @throws InvalidAlgorithmParameterException 
     * @throws InvalidKeyException 
     */
    public static Cipher getInstance(UUID uuid, int opmode, byte[] key, byte[] IV) throws NoSuchAlgorithmException,
            NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException {
        return getInstance(uuid, opmode, key, IV, false);
    }

    public static Cipher getInstance(UUID uuid, int opmode, byte[] key, byte[] IV, boolean androidOverride)
            throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException,
            InvalidAlgorithmParameterException {
        if (uuid.equals(AES_CIPHER)) {
            Cipher cipher = CipherFactory.getInstance("AES/CBC/PKCS5Padding", androidOverride);

            cipher.init(opmode, new SecretKeySpec(key, "AES"), new IvParameterSpec(IV));

            return cipher;
        }

        throw new NoSuchAlgorithmException("UUID unrecognized.");
    }
}