001/*
002 * jPOS Project [http://jpos.org]
003 * Copyright (C) 2000-2026 jPOS Software SRL
004 *
005 * This program is free software: you can redistribute it and/or modify
006 * it under the terms of the GNU Affero General Public License as
007 * published by the Free Software Foundation, either version 3 of the
008 * License, or (at your option) any later version.
009 *
010 * This program is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
013 * GNU Affero General Public License for more details.
014 *
015 * You should have received a copy of the GNU Affero General Public License
016 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
017 */
018
019package org.jpos.q2.cli;
020
021import org.jpos.iso.ISOUtil;
022import org.jpos.q2.CLICommand;
023import org.jpos.q2.CLIContext;
024import org.jpos.security.SystemSeed;
025
026import java.nio.ByteBuffer;
027import java.security.SecureRandom;
028import java.util.Base64;
029
030/**
031 * Obfuscate a secret
032 */
033public class OBF implements CLICommand {
034    /** Default constructor; no instance state to initialise. */
035    public OBF() {}
036    @Override
037    public void exec(CLIContext cli, String[] args) throws Exception {
038        if (args.length != 2) {
039            usage(cli);
040            return;
041        }
042        cli.println (String.format("obf::%s", obf(args[1])));
043    }
044    /**
045     * Prints command usage to {@code cli}.
046     *
047     * @param cli the CLI context to write to
048     */
049    public void usage(CLIContext cli) {
050        cli.println("Usage: obf \"secret\"");
051    }
052
053    private String obf(String s) {
054        SecureRandom sr = new SecureRandom();
055        byte[] b = s.getBytes();
056        byte[] e = new byte[Math.abs(sr.nextInt()) % 32];
057        int i = Math.abs(sr.nextInt());
058        sr.nextBytes(e);
059        b = ISOUtil.xor(b, SystemSeed.getSeed(i, b.length));
060        ByteBuffer buf = ByteBuffer.allocate(b.length + e.length + 8);
061        buf.putInt(i);
062        buf.putInt(b.length);
063        buf.put(b);
064        buf.put(e);
065        return Base64.getEncoder().encodeToString(buf.array());
066    }
067}