// crypt.java
// -------------------------------------
// (C) by Michael Peter Christen; mc@yacy.net
// first published on http://www.anomic.de
// Frankfurt, Germany, 2004
//
// $LastChangedDate$
// $LastChangedRevision$
// $LastChangedBy$
//
// This program 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 2 of the License, or
// (at your option) any later version.
//
// This program is 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 program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package net.yacy.utils;
import java.util.Random;
import net.yacy.cora.order.Base64Order;
import net.yacy.cora.util.ConcurrentLog;
public class crypt {
// --------------------------------------------------------
// Section: random salt generation
// --------------------------------------------------------
private static long saltcounter = 0;
private static Random saltrandom = new Random(System.currentTimeMillis());
public static String randomSalt() {
// generate robust 48-bit random number
final long salt = (saltrandom.nextLong() & 0XffffffffffffL) + (System.currentTimeMillis() & 0XffffffffffffL) + ((1001 * saltcounter) & 0XffffffffffffL);
saltcounter++;
// we generate 48-bit salt values, that are represented as 8-character
// b64-encoded strings
return Base64Order.standardCoder.encodeLongSB(salt & 0XffffffffffffL, 8).toString();
}
// --------------------------------------------------------
// Section: PBE + PublicKey based on passwords encryption
// --------------------------------------------------------
public static final String vDATE = "20030925";
public static final String copyright = "[ 'crypt' v" + vDATE + " by Michael Christen / www.anomic.de ]";
public static final String magicString = "crypt|anomic.de|0"; // magic identifier inside every '.crypt' - file
String cryptMethod; // one of ["TripleDES", "Blowfish", "DESede", "DES"]
//private static final String defaultMethod = "PBEWithMD5AndDES"; //"DES";
// --------------------------------------------------------
// Section: simple Codings
// --------------------------------------------------------
public static String simpleEncode(final String content) {
return simpleEncode(content, null, 'b');
}
public static String simpleEncode(final String content, final String key) {
return simpleEncode(content, key, 'b');
}
public static String simpleEncode(final String content, String key, final char method) {
if (key == null) { key = "NULL"; }
switch (method) {
case 'b' : return "b|" + Base64Order.enhancedCoder.encodeString(content);
case 'z' : return "z|" + Base64Order.enhancedCoder.encode(gzip.gzipString(content));
case 'p' : return "p|" + content;
default : return null;
}
}
public static String simpleDecode(final String encoded) {
if (encoded == null || encoded.length() < 3) {
return null;
}
if (encoded.charAt(1) != '|') {
return encoded;
} // not encoded
switch (encoded.charAt(0)) {
case 'b': {
return Base64Order.enhancedCoder.decodeString(encoded.substring(2));
}
case 'z':
try {
return gzip.gunzipString(Base64Order.enhancedCoder.decode(encoded.substring(2)));
} catch (final Exception e) {
ConcurrentLog.logException(e);
return null;
}
case 'p': {
return encoded.substring(2);
}
default: {
return null;
}
}
}
public static void main(final String[] args) {
final String teststring="1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
System.out.println("Teststring = " + teststring);
System.out.println("enc-b result = " + simpleDecode(simpleEncode(teststring, null, 'b')));
System.out.println("enc-z result = " + simpleDecode(simpleEncode(teststring, null, 'z')));
}
}