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120 lines
3.5 KiB
Java
120 lines
3.5 KiB
Java
/* ========================================================================
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* PlantUML : a free UML diagram generator
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* ========================================================================
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*
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* (C) Copyright 2009-2020, Arnaud Roques
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*
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* Project Info: http://plantuml.com
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*
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* If you like this project or if you find it useful, you can support us at:
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*
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* http://plantuml.com/patreon (only 1$ per month!)
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* http://plantuml.com/paypal
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*
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* This file is part of PlantUML.
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*
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* PlantUML is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* PlantUML distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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* License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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*
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*
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* Original Author: Arnaud Roques
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*
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*
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*/
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package net.sourceforge.plantuml.dedication;
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import java.awt.image.BufferedImage;
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import java.io.ByteArrayInputStream;
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import java.math.BigInteger;
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import net.sourceforge.plantuml.utils.MTRandom;
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public class DedicationCrypted implements Dedication {
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private final String argon2;
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private final BigInteger pq;
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private final byte crypted[];
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private final int tinyHash;
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private String solution;
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private long next = 0L;
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public DedicationCrypted(byte crypted[], int tinyHash, String argon2, BigInteger pq) {
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this.crypted = crypted;
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this.pq = pq;
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this.argon2 = argon2;
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this.tinyHash = tinyHash;
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}
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public synchronized BufferedImage getImage(final String sentence) {
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if (sentence.length() < 40) {
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return null;
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}
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try {
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if (solution == null || sentence.equals(this.solution) == false) {
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if (System.currentTimeMillis() < next) {
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return null;
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}
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final int tinyHash = Noise.shortHash(sentence.getBytes("UTF-8"), N.toByteArray());
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if (this.tinyHash != tinyHash) {
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return null;
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}
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this.next = System.currentTimeMillis() + 5000L;
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}
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final byte[] hash1 = Noise.computeArgon2bytes(sentence.getBytes("UTF-8"),
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(pq.toString(35) + sentence).getBytes("UTF-8"));
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final byte[] hash2 = Noise.computeArgon2bytes(sentence.getBytes("UTF-8"),
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(pq.toString(36) + sentence).getBytes("UTF-8"));
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final BlumBlumShub rndBBS = new BlumBlumShub(pq, hash1);
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final MTRandom rndMT = new MTRandom(hash2);
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byte[] current = crypted.clone();
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Noise.shuffle(current, rndMT);
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Noise.xor(current, rndBBS);
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Noise.xor(current, sentence.getBytes("UTF-8"));
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Noise.shuffle(current, rndMT);
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final RBlocks init = RBlocks.readFrom(current, 513);
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final RBlocks decoded = init.change(E, N);
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current = decoded.toByteArray(512);
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Noise.shuffle(current, rndMT);
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Noise.xor(current, rndBBS);
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final String argon = Noise.computeArgon2String(current, (pq.toString(34) + sentence).getBytes("UTF-8"));
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if (this.argon2.equals(argon) == false) {
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return null;
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}
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Noise.shuffle(current, rndMT);
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current = Noise.reverse(current, rndMT.nextInt());
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final BufferedImage img = PSystemDedication.getBufferedImage(new ByteArrayInputStream(current));
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this.solution = sentence;
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return img;
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} catch (Throwable t) {
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t.printStackTrace();
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return null;
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}
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}
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}
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