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/* ========================================================================
* PlantUML : a free UML diagram generator
* ========================================================================
*
* (C) Copyright 2009-2020, Arnaud Roques
*
* Project Info: http://plantuml.com
*
* If you like this project or if you find it useful, you can support us at:
*
* http://plantuml.com/patreon (only 1$ per month!)
* http://plantuml.com/paypal
*
* This file is part of PlantUML.
*
* PlantUML is free software; you can redistribute it and/or modify it
* under the terms of the GNU 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 General Public
* License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
*
* Original Author: Arnaud Roques
*
*
*/
package net.sourceforge.plantuml.eggs;
import java.math.BigInteger;
import net.sourceforge.plantuml.StringUtils;
public class EggUtils {
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;
}
}
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