2010-11-15 20:35:36 +00:00
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/* ========================================================================
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* PlantUML : a free UML diagram generator
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* ========================================================================
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*
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2016-01-09 12:15:40 +00:00
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* (C) Copyright 2009-2017, Arnaud Roques
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2010-11-15 20:35:36 +00:00
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*
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2016-03-06 16:47:34 +00:00
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* Project Info: http://plantuml.com
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2010-11-15 20:35:36 +00:00
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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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2013-12-10 19:36:50 +00:00
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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2010-11-15 20:35:36 +00:00
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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.eggs;
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import java.math.BigInteger;
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2015-04-07 18:18:37 +00:00
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import net.sourceforge.plantuml.StringUtils;
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2010-11-15 20:35:36 +00:00
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public class EggUtils {
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public static String fromByteArrays(byte data[]) {
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final StringBuilder sb = new StringBuilder();
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for (byte b : data) {
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final String hex = Integer.toHexString(b & 0xFF);
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if (hex.length() == 1) {
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sb.append('0');
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}
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sb.append(hex);
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}
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return sb.toString();
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}
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public static byte[] toByteArrays(String s) {
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final byte[] result = new byte[s.length() / 2];
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for (int i = 0; i < result.length; i++) {
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result[i] = (byte) Integer.parseInt(s.substring(i * 2, i * 2 + 2), 16);
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}
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return result;
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}
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public static BigInteger fromSecretSentence(String s) {
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BigInteger result = BigInteger.ZERO;
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final BigInteger twentySix = BigInteger.valueOf(26);
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s = s.replace('\u00E9', 'e');
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s = s.replace('\u00EA', 'e');
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for (char c : s.toCharArray()) {
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final int num = convertChar(c);
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if (num != -1) {
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result = result.multiply(twentySix);
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result = result.add(BigInteger.valueOf(num));
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}
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}
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return result;
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}
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private static int convertChar(char c) {
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2015-04-07 18:18:37 +00:00
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c = StringUtils.goLowerCase(c);
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2010-11-15 20:35:36 +00:00
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if (c >= 'a' && c <= 'z') {
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return c - 'a';
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}
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return -1;
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}
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public static byte[] xor(byte data[], byte key[]) {
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final byte[] result = new byte[data.length];
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int pos = 0;
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for (int i = 0; i < result.length; i++) {
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result[i] = (byte) (data[i] ^ key[pos++]);
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if (pos == key.length) {
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pos = 0;
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}
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}
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return result;
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}
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}
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