com.github.bloodshura.x.cryptography.AbstractCipher Maven / Gradle / Ivy

Go to download
/*
 * Copyright (c) 2013-2018, João Vitor Verona Biazibetti - All Rights Reserved
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 .
 *
 * https://www.github.com/BloodShura
 */

package com.github.bloodshura.x.cryptography;

import com.github.bloodshura.x.cryptography.exception.CryptoException;
import com.github.bloodshura.x.worker.ArrayWorker;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.security.GeneralSecurityException;

public abstract class AbstractCipher extends AbstractByteArraySalted implements Twoway {
	public AbstractCipher() {
		setSalt(0L);
	}

	@Nonnull
	@Override
	public byte[] decrypt(@Nonnull byte[] data) throws CryptoException {
		return start(BuildableCipher.Mode.DECRYPT).end(data);
	}

	@Nonnull
	@Override
	public byte[] encrypt(@Nonnull byte[] data) throws CryptoException {
		return start(BuildableCipher.Mode.ENCRYPT).end(data);
	}

	@Override
	public final void setSalt(@Nullable byte[] salt) throws CryptoException {
		super.setSalt(salt != null ? ArrayWorker.copyOf(salt, getSaltLength()) : null);
	}

	@Nonnull
	public final BuildableCipher start(@Nonnull BuildableCipher.Mode mode) throws CryptoException {
		return new BuildableCipher(this, mode);
	}

	@Nonnull
	protected abstract Cipher createCipher() throws GeneralSecurityException;

	protected abstract int getSaltLength();

	@Nonnull
	protected abstract SecretKeySpec getSecretKeySpec();
}