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PlantUML is a component that allows to quickly write diagrams from text.
There is a newer version: 1.2024.8
// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
/* +=======================================================================
 * |
 * |      PlantUML : a free UML diagram generator
 * |
 * +=======================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 *
 * If you like this project or if you find it useful, you can support us at:
 *
 * https://plantuml.com/patreon (only 1$ per month!)
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 *
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License V2.
 *
 * THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC
 * LICENSE ("AGREEMENT"). [GNU General Public License V2]
 *
 * ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM CONSTITUTES
 * RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
 *
 * You may obtain a copy of the License at
 *
 * https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * PlantUML can occasionally display sponsored or advertising messages. Those
 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
 * See https://plantuml.com/professional if you want to remove them
 *
 * Images (whatever their format : PNG, SVG, EPS...) generated by running PlantUML
 * are owned by the author of their corresponding sources code (that is, their
 * textual description in PlantUML language). Those images are not covered by
 * this GPL v2 license.
 *
 * The generated images can then be used without any reference to the GPL v2 license.
 * It is not even necessary to stipulate that they have been generated with PlantUML,
 * although this will be appreciated by the PlantUML team.
 *
 * There is an exception : if the textual description in PlantUML language is also covered
 * by any license, then the generated images are logically covered
 * by the very same license.
 *
 * This is the IGY distribution (Install GraphViz by Yourself).
 * You have to install GraphViz and to setup the GRAPHVIZ_DOT environment variable
 * (see https://plantuml.com/graphviz-dot )
 *
 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
 * Stdlib AWS provided by https://github.com/milo-minderbinder/AWS-PlantUML
 * Stdlib Icons provided https://github.com/tupadr3/plantuml-icon-font-sprites
 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
 * Brotli (c) by the Brotli Authors https://github.com/google/brotli
 * Themes (c) by Brett Schwarz https://github.com/bschwarz/puml-themes
 * Twemoji (c) by Twitter at https://twemoji.twitter.com/
 *
 */
package net.sourceforge.plantuml.dedication;

import static java.nio.charset.StandardCharsets.UTF_8;

import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.math.BigInteger;

import net.sourceforge.plantuml.log.Logme;
import net.sourceforge.plantuml.security.SFile;
import net.sourceforge.plantuml.utils.MTRandom;

public class DedicationCrypted implements Dedication {

	private final String argon2;
	private final BigInteger pq;
	private final byte crypted[];
	private final int tinyHash;
	private String solution;

	private long next = 0L;

	public DedicationCrypted(byte crypted[], int tinyHash, String argon2, BigInteger pq) {
		this.crypted = crypted;
		this.pq = pq;
		this.argon2 = argon2;
		this.tinyHash = tinyHash;
	}

	public synchronized BufferedImage getImage(final TinyHashableString sentence) {
		final String line = sentence.getSentence();

		if (line.length() < 40)
			return null;

		try {
			if (solution == null || line.equals(this.solution) == false) {
				if (System.currentTimeMillis() < next)
					return null;

				if (this.tinyHash != sentence.tinyHash())
					return null;

				this.next = System.currentTimeMillis() + 5000L;
			}

			final byte[] hash1 = Noise.computeArgon2bytes(line.getBytes(UTF_8),
					(pq.toString(35) + line).getBytes(UTF_8));
			final byte[] hash2 = Noise.computeArgon2bytes(line.getBytes(UTF_8),
					(pq.toString(36) + line).getBytes(UTF_8));

			final BlumBlumShub rndBBS = new BlumBlumShub(pq, hash1);
			final MTRandom rndMT = new MTRandom(hash2);

			byte[] current = crypted.clone();
			Noise.shuffle(current, rndMT);
			Noise.xor(current, rndBBS);
			Noise.xor(current, line.getBytes(UTF_8));

			Noise.shuffle(current, rndMT);

			final RBlocks init = RBlocks.readFrom(current, 513);
			final RBlocks decoded = init.change(E, N);

			current = decoded.toByteArray(512);

			Noise.shuffle(current, rndMT);
			Noise.xor(current, rndBBS);

			final String argon = Noise.computeArgon2String(current, (pq.toString(34) + line).getBytes(UTF_8));

			if (this.argon2.equals(argon) == false)
				return null;

			Noise.shuffle(current, rndMT);
			current = Noise.reverse(current, rndMT.nextInt());

			final BufferedImage img = SFile.getBufferedImageFromWebpButHeader(new ByteArrayInputStream(current));
			this.solution = line;
			return img;
		} catch (Throwable t) {
			Logme.error(t);
			return null;
		}

	}

}