com.github.bloodshura.x.cryptography.io.EncryptedDataInput Maven / Gradle / Ivy

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/*
 * 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.io;

import com.github.bloodshura.x.cryptography.Decrypter;
import com.github.bloodshura.x.io.stream.DataInput;
import com.github.bloodshura.x.resource.Resource;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.io.IOException;
import java.io.InputStream;

public class EncryptedDataInput extends DataInput {
	private Decrypter decrypter;

	public EncryptedDataInput(@Nonnull InputStream input) {
		super(input);
	}

	public EncryptedDataInput(@Nonnull Resource resource) throws IOException {
		super(resource);
	}

	@Nullable
	public Decrypter getDecrypter() {
		return decrypter;
	}

	public boolean hasDecrypter() {
		return getDecrypter() != null;
	}

	@Nonnull
	@Override
	public String readASCII() throws IOException {
		if (hasDecrypter()) {
			byte[] data = readBytes();
			byte[] decrypted = getDecrypter().decrypt(data);
			char[] value = new char[decrypted.length];

			for (int i = 0; i < value.length; i++) {
				value[i] = (char) decrypted[i];
			}

			return String.valueOf(value);
		}

		return super.readASCII();
	}

	@Nonnull
	@Override
	public String readUTF() throws IOException {
		if (hasDecrypter()) {
			return getDecrypter().decryptToStr(readBytes());
		}

		return super.readUTF();
	}

	public void setDecrypter(@Nullable Decrypter decrypter) {
		this.decrypter = decrypter;
	}
}