94 lines
3.1 KiB
Java
94 lines
3.1 KiB
Java
/*
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* Copyright (C) 2009-2013 moparisthebest
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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 Affero General Public License as published by
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* the Free Software Foundation, either version 3 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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Official forums are http://www.moparscape.org/smf/
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* Email me at admin@moparisthebest.com.
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*/
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package org.moparscape.iface;
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import java.math.BigInteger;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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public class Hasher {
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private MessageDigest md = null;
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/**
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* This reverts to a default of the SHA-1 algorithm
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*/
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public Hasher() {
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this("SHA-1");
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}
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/**
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* You can specify whatever algorithm that Java supports to this, and if it isn't supported it will first
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* try to use SHA-1 and then MD5 before showing a warning and reverting to not hashing anything.
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* <p/>
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* null as the algorithm has a special value meaning you don't want hashString to actually hash anything.
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*
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* @param algorithm
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*/
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public Hasher(String algorithm) {
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if (algorithm == null || algorithm.equalsIgnoreCase("none"))
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return;
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try {
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md = MessageDigest.getInstance(algorithm);
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} catch (NoSuchAlgorithmException e) {
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try {
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md = MessageDigest.getInstance("SHA-1");
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} catch (NoSuchAlgorithmException e2) {
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try {
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md = MessageDigest.getInstance("MD5");
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} catch (NoSuchAlgorithmException e3) {
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System.err.println("Error: Your passwords will not be hashed before being sent over the network, be careful, and don't use anything important!!!!");
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e.printStackTrace();
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}
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}
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}
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}
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/**
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* Returns a hexadecimal representation of the hash of the string.
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*
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* @param toHash
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* @return
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*/
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public synchronized String hashString(String toHash) {
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if (toHash == null)
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return null;
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if (md == null)
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return toHash;
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md.reset();
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md.update(toHash.getBytes());
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//String ret = new java.math.BigInteger(1, md.digest()).toString(16);
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String ret = toHex(md.digest());
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md.reset();
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return ret;
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}
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private String toHex(byte[] bytes) {
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// change below to lower or uppercase X to control case of output
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return String.format("%0" + (bytes.length << 1) + "x", new BigInteger(1, bytes));
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}
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public static void main(String[] args){
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System.out.printf("'%s' hash of '%s': '%s'\n", args[0], args[1], new Hasher(args[0]).hashString(args[1]));
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}
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}
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