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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 GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PlantUML 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 Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see .
 *
 * 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 LGPL license.
 *
 * The generated images can then be used without any reference to the LGPL 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.eggs;

import java.math.BigInteger;

import net.sourceforge.plantuml.StringUtils;

public class EggUtils {
	// ::remove file when __CORE__

	public static String fromByteArrays(byte data[]) {
		final StringBuilder sb = new StringBuilder();
		for (byte b : data) {
			final String hex = Integer.toHexString(b & 0xFF);
			if (hex.length() == 1)
				sb.append('0');

			sb.append(hex);
		}
		return sb.toString();
	}

	public static byte[] toByteArrays(String s) {
		final byte[] result = new byte[s.length() / 2];
		for (int i = 0; i < result.length; i++)
			result[i] = (byte) Integer.parseInt(s.substring(i * 2, i * 2 + 2), 16);

		return result;
	}

	public static BigInteger fromSecretSentence(String s) {
		BigInteger result = BigInteger.ZERO;
		final BigInteger twentySix = BigInteger.valueOf(26);
		s = s.replace('\u00E9', 'e');
		s = s.replace('\u00EA', 'e');
		for (char c : s.toCharArray()) {
			final int num = convertChar(c);
			if (num != -1) {
				result = result.multiply(twentySix);
				result = result.add(BigInteger.valueOf(num));
			}
		}
		return result;

	}

	private static int convertChar(char c) {
		c = StringUtils.goLowerCase(c);
		if (c >= 'a' && c <= 'z')
			return c - 'a';
		return -1;
	}

	public static byte[] xor(byte data[], byte key[]) {
		final byte[] result = new byte[data.length];
		int pos = 0;
		for (int i = 0; i < result.length; i++) {
			result[i] = (byte) (data[i] ^ key[pos++]);
			if (pos == key.length)
				pos = 0;
		}
		return result;
	}

}