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117 lines
4.5 KiB
117 lines
4.5 KiB
// crypt.java
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// -------------------------------------
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// (C) by Michael Peter Christen; mc@yacy.net
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2004
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//
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// $LastChangedDate$
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// $LastChangedRevision$
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// $LastChangedBy$
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package net.yacy.utils;
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import java.util.Random;
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import net.yacy.cora.order.Base64Order;
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import net.yacy.cora.util.ConcurrentLog;
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public class crypt {
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// --------------------------------------------------------
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// Section: random salt generation
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// --------------------------------------------------------
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private static long saltcounter = 0;
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private static Random saltrandom = new Random(System.currentTimeMillis());
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public static String randomSalt() {
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// generate robust 48-bit random number
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final long salt = (saltrandom.nextLong() & 0XffffffffffffL) + (System.currentTimeMillis() & 0XffffffffffffL) + ((1001 * saltcounter) & 0XffffffffffffL);
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saltcounter++;
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// we generate 48-bit salt values, that are represented as 8-character
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// b64-encoded strings
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return Base64Order.standardCoder.encodeLongSB(salt & 0XffffffffffffL, 8).toString();
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}
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// --------------------------------------------------------
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// Section: PBE + PublicKey based on passwords encryption
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// --------------------------------------------------------
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public static final String vDATE = "20030925";
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public static final String copyright = "[ 'crypt' v" + vDATE + " by Michael Christen / www.anomic.de ]";
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public static final String magicString = "crypt|anomic.de|0"; // magic identifier inside every '.crypt' - file
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String cryptMethod; // one of ["TripleDES", "Blowfish", "DESede", "DES"]
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//private static final String defaultMethod = "PBEWithMD5AndDES"; //"DES";
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// --------------------------------------------------------
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// Section: simple Codings
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// --------------------------------------------------------
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public static String simpleEncode(final String content) {
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return simpleEncode(content, null, 'b');
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}
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public static String simpleEncode(final String content, final String key) {
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return simpleEncode(content, key, 'b');
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}
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public static String simpleEncode(final String content, String key, final char method) {
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if (key == null) { key = "NULL"; }
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switch (method) {
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case 'b' : return "b|" + Base64Order.enhancedCoder.encodeString(content);
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case 'z' : return "z|" + Base64Order.enhancedCoder.encode(Gzip.gzipString(content));
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case 'p' : return "p|" + content;
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default : return null;
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}
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}
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public static String simpleDecode(final String encoded) {
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if (encoded == null || encoded.length() < 3) {
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return null;
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}
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if (encoded.charAt(1) != '|') {
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return encoded;
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} // not encoded
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switch (encoded.charAt(0)) {
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case 'b': {
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return Base64Order.enhancedCoder.decodeString(encoded.substring(2));
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}
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case 'z':
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try {
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return Gzip.gunzipString(Base64Order.enhancedCoder.decode(encoded.substring(2)));
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} catch (final Exception e) {
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ConcurrentLog.logException(e);
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return null;
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}
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case 'p': {
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return encoded.substring(2);
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}
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default: {
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return null;
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}
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}
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}
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public static void main(final String[] args) {
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final String teststring="1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
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System.out.println("Teststring = " + teststring);
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System.out.println("enc-b result = " + simpleDecode(simpleEncode(teststring, null, 'b')));
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System.out.println("enc-z result = " + simpleDecode(simpleEncode(teststring, null, 'z')));
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}
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} |