/* Copyright (C) 2002-2004 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of version 2 of the GNU General Public License as published by the Free Software Foundation. There are special exceptions to the terms and conditions of the GPL as it is applied to this software. View the full text of the exception in file EXCEPTIONS-CONNECTOR-J in the directory of this software distribution. 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 com.mysql.jdbc; import java.io.ObjectInputStream; import java.io.PrintWriter; import java.io.StringWriter; /** * Various utility methods for the driver. * * @author Mark Matthews */ public class Util { //~ Static fields/initializers --------------------------------------------- private static Util enclosingInstance = new Util(); //~ Methods ---------------------------------------------------------------- /** * Given a ResultSet and an index into the columns of that ResultSet, * read binary data from the column which represents a serialized object, * and re-create the object. * * @param resultSet the ResultSet to use. * @param index an index into the ResultSet. * @return the object if it can be de-serialized * @throws Exception if an error occurs */ public static Object readObject(java.sql.ResultSet resultSet, int index) throws Exception { ObjectInputStream objIn = new ObjectInputStream(resultSet .getBinaryStream(index)); Object obj = objIn.readObject(); objIn.close(); return obj; } /** * DOCUMENT ME! * * @param message DOCUMENT ME! * @param password DOCUMENT ME! * * @return DOCUMENT ME! */ public static String scramble(String message, String password) { long[] hashPass; long[] hashMessage; byte[] to = new byte[8]; String val = ""; //$NON-NLS-1$ message = message.substring(0, 8); if ((password != null) && (password.length() > 0)) { hashPass = newHash(password); hashMessage = newHash(message); RandStructcture randStruct = randomInit(hashPass[0] ^ hashMessage[0], hashPass[1] ^ hashMessage[1]); int msgPos = 0; int msgLength = message.length(); int toPos = 0; while (msgPos++ < msgLength) { to[toPos++] = (byte) (Math.floor(rnd(randStruct) * 31) + 64); } /* Make it harder to break */ byte extra = (byte) (Math.floor(rnd(randStruct) * 31)); for (int i = 0; i < to.length; i++) { to[i] ^= extra; } val = new String(to); } return val; } /** * Converts a nested exception into a nicer message * * @param ex the exception to expand into a message. * * @return a message containing the exception, the * message (if any), and a stacktrace. */ public static String stackTraceToString(Throwable ex) { StringBuffer traceBuf = new StringBuffer(); traceBuf.append(Messages.getString("Util.1")); //$NON-NLS-1$ if (ex != null) { traceBuf.append(ex.getClass().getName()); String message = ex.getMessage(); if (message != null) { traceBuf.append(Messages.getString("Util.2")); //$NON-NLS-1$ traceBuf.append(message); } StringWriter out = new StringWriter(); PrintWriter printOut = new PrintWriter(out); ex.printStackTrace(printOut); traceBuf.append(Messages.getString("Util.3")); //$NON-NLS-1$ traceBuf.append(out.toString()); } traceBuf.append(Messages.getString("Util.4")); //$NON-NLS-1$ return traceBuf.toString(); } // Right from Monty's code static String newCrypt(String password, String seed) { byte b; double d; if ((password == null) || (password.length() == 0)) { return password; } long[] pw = newHash(seed); long[] msg = newHash(password); long max = 0x3fffffffL; long seed1 = (pw[0] ^ msg[0]) % max; long seed2 = (pw[1] ^ msg[1]) % max; char[] chars = new char[seed.length()]; for (int i = 0; i < seed.length(); i++) { seed1 = ((seed1 * 3) + seed2) % max; seed2 = (seed1 + seed2 + 33) % max; d = (double) seed1 / (double) max; b = (byte) java.lang.Math.floor((d * 31) + 64); chars[i] = (char) b; } seed1 = ((seed1 * 3) + seed2) % max; seed2 = (seed1 + seed2 + 33) % max; d = (double) seed1 / (double) max; b = (byte) java.lang.Math.floor(d * 31); for (int i = 0; i < seed.length(); i++) { chars[i] ^= (char) b; } return new String(chars); } static long[] newHash(String password) { long nr = 1345345333L; long add = 7; long nr2 = 0x12345671L; long tmp; for (int i = 0; i < password.length(); ++i) { if ((password.charAt(i) == ' ') || (password.charAt(i) == '\t')) { continue; // skip spaces } tmp = (0xff & password.charAt(i)); nr ^= ((((nr & 63) + add) * tmp) + (nr << 8)); nr2 += ((nr2 << 8) ^ nr); add += tmp; } long[] result = new long[2]; result[0] = nr & 0x7fffffffL; result[1] = nr2 & 0x7fffffffL; return result; } static String oldCrypt(String password, String seed) { long hp; long hm; long s1; long s2; long max = 0x01FFFFFF; double d; byte b; if ((password == null) || (password.length() == 0)) { return password; } hp = oldHash(seed); hm = oldHash(password); long nr = hp ^ hm; nr %= max; s1 = nr; s2 = nr / 2; char[] chars = new char[seed.length()]; for (int i = 0; i < seed.length(); i++) { s1 = ((s1 * 3) + s2) % max; s2 = (s1 + s2 + 33) % max; d = (double) s1 / max; b = (byte) java.lang.Math.floor((d * 31) + 64); chars[i] = (char) b; } return new String(chars); } static long oldHash(String password) { long nr = 1345345333; long nr2 = 7; long tmp; for (int i = 0; i < password.length(); i++) { if ((password.charAt(i) == ' ') || (password.charAt(i) == '\t')) { continue; } tmp = password.charAt(i); nr ^= ((((nr & 63) + nr2) * tmp) + (nr << 8)); nr2 += tmp; } return nr & ((1L << 31) - 1L); } private static RandStructcture randomInit(long seed1, long seed2) { RandStructcture randStruct = enclosingInstance.new RandStructcture(); randStruct.maxValue = 0x3FFFFFFFL; randStruct.maxValueDbl = randStruct.maxValue; randStruct.seed1 = seed1 % randStruct.maxValue; randStruct.seed2 = seed2 % randStruct.maxValue; return randStruct; } private static double rnd(RandStructcture randStruct) { randStruct.seed1 = ((randStruct.seed1 * 3) + randStruct.seed2) % randStruct.maxValue; randStruct.seed2 = (randStruct.seed1 + randStruct.seed2 + 33) % randStruct.maxValue; return ((randStruct.seed1) / randStruct.maxValueDbl); } //~ Inner Classes ---------------------------------------------------------- class RandStructcture { double maxValueDbl; long maxValue; long seed1; long seed2; } }