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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!)
 * https://plantuml.com/liberapay (only 1€ per month!)
 * https://plantuml.com/paypal
 *
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the Eclipse Public License.
 *
 * THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC
 * LICENSE ("AGREEMENT"). [Eclipse Public License - v 1.0]
 *
 * ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM CONSTITUTES
 * RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
 *
 * You may obtain a copy of the License at
 *
 * http://www.eclipse.org/legal/epl-v10.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 EPL license.
 *
 * The generated images can then be used without any reference to the EPL 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 net.sourceforge.plantuml.argon2.Argon2;
import net.sourceforge.plantuml.argon2.Argon2Factory;
import net.sourceforge.plantuml.argon2.model.Argon2Type;
import net.sourceforge.plantuml.utils.MTRandom;

public class Noise {

	private static Argon2 argon2(byte[] buffer, byte[] salt) {
		final Argon2 argon = Argon2Factory.create() //
				.setType(Argon2Type.Argon2id) //
				.setMemory(8) //
				.setSalt(salt.clone()) //
				.setIterations(50) //
				.setPassword(buffer.clone());
		argon.hashNow();
		return argon;
	}

	public static String computeArgon2String(byte[] buffer, byte[] salt) {
		return argon2(buffer, salt).getOutputString();
	}

	public static byte[] computeArgon2bytes(byte[] buffer, byte[] salt) {
		return argon2(buffer, salt).getOutput();
	}

	public static int shortHash(byte[] buffer, byte[] salt) {
		final byte hash[] = argon2(buffer, salt).getOutput();
		int result = 0;
		for (byte b : hash) {
			final int b1 = b & 0x0F;
			final int b2 = (b & 0xF0) >> 4;
			result ^= b1 ^ b2;
		}
		return result;
	}

	public static void shuffle(byte[] buffer, MTRandom rnd) {
		for (int i = 0; i < buffer.length; i++) {
			final int r1 = rnd.nextInt();
			final int r2 = rnd.nextInt();
			final int a = Math.abs(r1) % buffer.length;
			final int b = Math.abs(r2) % buffer.length;
			final byte tmp = buffer[a];
			buffer[a] = buffer[b];
			buffer[b] = tmp;
		}
	}

	public static void xor(byte[] buffer, byte[] xor) {
		for (int i = 0; i < buffer.length; i++)
			buffer[i] ^= xor[i % xor.length];

	}

	public static void xor(byte[] buffer, BlumBlumShub rnd) {
		for (int i = 0; i < buffer.length; i++) {
			final byte mask = (byte) (rnd.nextRnd(8) & 0xFF);
			buffer[i] = (byte) (buffer[i] ^ mask);
		}
	}

	public static byte[] reverse(byte[] buffer, int delta) {
		delta = Math.abs(delta) % buffer.length;
		final byte result[] = new byte[buffer.length];
		for (int i = 0; i < buffer.length; i++)
			result[i] = buffer[(buffer.length - 1 - i + delta) % buffer.length];
		return result;
	}

}