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138 lines
6.2 KiB
138 lines
6.2 KiB
// crypt.java
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// -------------------------------------
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// (C) by Michael Peter Christen; mc@anomic.de
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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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//
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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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// Any changes to this file according to the GPL as documented in the file
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// gpl.txt aside this file in the shipment you received can be done to the
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// lines that follows this copyright notice here, but changes must not be
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// done inside the copyright notive above. A re-distribution must contain
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// the intact and unchanged copyright notice.
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// Contributions and changes to the program code must be marked as such.
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package de.anomic.tools;
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import java.text.SimpleDateFormat;
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import java.util.Locale;
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import java.util.Random;
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import de.anomic.kelondro.kelondroBase64Order;
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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 kelondroBase64Order.standardCoder.encodeLong(salt & 0XffffffffffffL, 8);
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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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public static final SimpleDateFormat dateFormatter = new SimpleDateFormat("yyyyMMddHHmmssSSS", Locale.ENGLISH);
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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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public crypt(String pbe) {
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// this is possible, but not recommended
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this(pbe, (pbe + "XXXXXXXX").substring(0, 8));
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}
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public crypt(String pbe, String salt) {
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this(pbe, salt, defaultMethod);
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}
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private crypt(String pbe, String salt, String method) {
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// a Password-Based Encryption. The SecretKey is created on the fly
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if (salt.length() > 8) salt = salt.substring(0,8);
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if (salt.length() < 8) salt = (salt + "XXXXXXXX").substring(0,8);
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// Create a cipher and initialize it for encrypting end decrypting
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cryptMethod = method;
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}
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// --------------------------------------------------------
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// Section: simple Codings
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// --------------------------------------------------------
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public static String simpleEncode(String content) {
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return simpleEncode(content, null, 'b');
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}
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public static String simpleEncode(String content, String key) {
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return simpleEncode(content, key, 'b');
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}
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public static String simpleEncode(String content, String key, 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|" + kelondroBase64Order.enhancedCoder.encodeString(content);
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case 'z' : return "z|" + kelondroBase64Order.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(String encoded, String key) {
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if (encoded == null || encoded.length() < 3) { return null; }
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if (encoded.charAt(1) != '|') { return encoded; } // not encoded
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switch (encoded.charAt(0)) {
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case 'b' : return kelondroBase64Order.enhancedCoder.decodeString(encoded.substring(2), "de.anomic.tools.crypt.simpleDecode()");
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case 'z' : return gzip.gunzipString(kelondroBase64Order.enhancedCoder.decode(encoded.substring(2), "de.anomic.tools.crypt.simpleDecode()"));
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case 'p' : return encoded.substring(2);
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default : return null;
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}
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}
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public static void main(String[] args) {
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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'), null));
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System.out.println("enc-z result = " + simpleDecode(simpleEncode(teststring, null, 'z'), null));
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}
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} |