import java.security.MessageDigest;
public class XYZMessageDigest extends MessageDigest implements Cloneable {
private int hash;
private int store;
private int nBytes;
public XYZMessageDigest() {
super("XYZ");
engineReset();
}
public void engineUpdate(byte b) {
switch (nBytes) {
case 0:
store = (b << 24) & 0xff000000;
break;
case 1:
store |= (b << 16) & 0x00ff0000;
break;
case 2:
store |= (b << 8) & 0x0000ff00;
break;
case 3:
store |= (b << 0) & 0x000000ff;
break;
}
nBytes++;
if (nBytes == 4) {
hash = hash ^ store;
nBytes = 0;
store = 0;
}
}
public void engineUpdate(byte b[], int offset, int length) {
for (int i = 0; i < length; i++)
engineUpdate(b[i + offset]);
}
public void engineReset() {
hash = 0;
store = 0;
nBytes = 0;
}
public byte[] engineDigest() {
while (nBytes != 0)
engineUpdate((byte) 0);
byte b[] = new byte[4];
b[0] = (byte) (hash >>> 24);
b[1] = (byte) (hash >>> 16);
b[2] = (byte) (hash >>> 8);
b[3] = (byte) (hash >>> 0);
engineReset();
return b;
}
}