Kode-boks bug ved store kodestumper

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;

public class HashFinderMT {
private int nthr;
private byte[] valid;
private boolean done;
public HashFinderMT(int nthr, String valid) {
this.nthr = nthr;
this.valid = valid.getBytes();
done = false;
}
public void findHash(byte[] target) throws NoSuchAlgorithmException {
int len = 1;
while(!done) {
System.out.println("Checking all passwords of length " + len);
findHash(target, len);
len++;
}
}
public void findHash(byte[] target, int len) throws NoSuchAlgorithmException {
Thread[] t = new FinderThread[nthr];
int[] split = new int[nthr + 1];
for(int i = 0; i <= nthr; i++) {
split[i] = valid.length * i / nthr;
}
for(int i = 0; i < nthr; i++) {
t[i] = new FinderThread(split[i], split[i + 1] - 1, this, len, target);
}
for(int i = 0; i < nthr; i++) {
t[i].start();
}
for(int i = 0; i < nthr; i++) {
try {
t[i].join();
} catch (InterruptedException e) {
}
}
}
public byte[] getValid() {
return valid;
}
public boolean getDone() {
return done;
}
public void setDone(boolean done) {
this.done = done;
}
public static void main(String[] args) throws NoSuchAlgorithmException {
// Demo : find zzzzz blandt små bogstaver og tal
HashFinderMT hfmt = new HashFinderMT(4, "abcdefghijklmnopqrstuwvxyz0123456789");
hfmt.findHash(MessageDigest.getInstance("SHA-256&quo
t;).digest("zzzzz".getBytes()));
}
}

class FinderThread extends Thread {
private MessageDigest md;
private int start;
private int end;
private HashFinderMT hfmt;
private byte[] buf;
byte[] target;
byte[] valid;
public FinderThread(int start, int end, HashFinderMT hfmt, int len, byte[] target) throws NoSuchAlgorithmException {
md = MessageDigest.getInstance("SHA-256");
this.start = start;
this.end = end;
this.hfmt = hfmt;
buf = new byte[len];
this.target = target;
valid = hfmt.getValid();
}
public void run() {
for(int i = start; i <= end; i++) {
buf[0] = valid[i];
checkAllHash(buf, 1);
}
}
public void checkAllHash(byte[] buf, int ix) {
if(hfmt.getDone()) return;
if(ix < buf.length) {
for(int i = 0; i < valid.length; i++) {
buf[ix] = valid[i];
checkAllHash(buf, ix + 1);
}
} else {
checkHash(buf);
}
}
public void checkHash(byte[] pw) {
if(Arrays.equals(md.digest(pw), target)) {
System.out.println("Found match: " + new String(pw));
hfmt.setDone(true);
}
}
}

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