com.github.bloodshura.x.cryptography.AbstractDigest 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;

import com.github.bloodshura.x.cryptography.exception.CryptoException;
import com.github.bloodshura.x.math.BaseConverter;

import javax.annotation.Nonnull;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public abstract class AbstractDigest extends AbstractByteArraySalted implements Encrypter {
	private final MessageDigest digest;

	public AbstractDigest(@Nonnull MessageDigest digest) {
		this.digest = digest;
	}

	public AbstractDigest(@Nonnull String digestName) throws CryptoException {
		this(digestFor(digestName));
	}

	@Nonnull
	@Override
	public byte[] encrypt(@Nonnull byte[] data) throws CryptoException {
		if (hasSalt()) {
			getDigest().update(getSalt());
		}

		getDigest().update(data);

		return getDigest().digest();
	}

	@Nonnull
	@Override
	public String encryptToStr(@Nonnull byte[] data) throws CryptoException {
		return encryptToStr(data, BaseConverter.HEXADECIMAL);
	}

	@Nonnull
	public String encryptToStr(@Nonnull byte[] data, int radix) throws CryptoException {
		return new BigInteger(1, encrypt(data)).toString(radix);
	}

	@Nonnull
	@Override
	public String encryptToStr(@Nonnull CharSequence sequence) throws CryptoException {
		return encryptToStr(sequence, BaseConverter.HEXADECIMAL);
	}

	@Nonnull
	public String encryptToStr(@Nonnull CharSequence sequence, int radix) throws CryptoException {
		return new BigInteger(1, encrypt(sequence)).toString(radix);
	}

	@Nonnull
	public MessageDigest getDigest() {
		return digest;
	}

	private static MessageDigest digestFor(String digestName) throws CryptoException {
		try {
			return MessageDigest.getInstance(digestName);
		}
		catch (NoSuchAlgorithmException exception) {
			throw new CryptoException(exception);
		}
	}
}