endianess from scrypt

A.java

//data from here https://litecoin.info/Scrypt

import java.io.*;
import java.util.*;
import java.net.*;
import java.security.*;
import java.text.*;
import java.util.zip.*;

public class A {

 public static String data = "0000000105e9a54b7f65b46864bc90f55d67cccd8b6404a02f5e064a6df69282adf6e2e5f7f953b0632b25b099858b717bb7b24084148cfa841a89f106bc6b655b18d2ed4ebb191a1d018ea700000000000000800000000000000000000000000000000000000000000000000000000000000000000000000000000080020000";
 public static String target = "0000000000000000000000000000000000000000000000000000a78e01000000";
 private static byte[] targetBuf = new byte[128];
 private static byte[] dataBuf   = new byte[128];
 private static byte[] targetBufLE = new byte[128];
 private static byte[] dataBufLE   = new byte[128];


 public static byte[] endianSwitch(byte[] bytes) {
          //Method to switch the endianess of a byte array
           byte[] bytes2 = new byte[bytes.length];
           for(int i = 0; i < bytes.length;  i++){
                   bytes2[i] = bytes[bytes.length-i-1];
           }
           return bytes2;
 }

 public static String prettyPrintByteArray(byte[] bites){
        //Method to convert a byte array to hex literal separated by bites.
        String str = "";
        int n = 0;
        for(byte bite:bites){
                n += 1;
                str = str + (Integer.toString( ( bite & 0xff ) + 0x100, 16 /* radix */ ).substring( 1 ));
        }
        return str;
 }
 public static byte[] hexStrToData( String str ) throws NumberFormatException {
         if ( str.length() % 2 != 0 )
                      throw new NumberFormatException("Invalid length of string");
         byte[] buf = new byte[str.length() >> 1];
         for ( int i=0; i<buf.length; i++) {
              buf[i] = (byte) Integer.parseInt( str.substring(i*2,i*2+2), 16);
         }
         return buf;
  }
  public static byte[] chunkEndianSwitch(byte[] bytes) {
           //Method to properly switch the endianness of the header -- numbers must be treated as 32 bit chunks. Thanks to ali1234 for this.
           byte[] bytes2 = new byte[bytes.length];
           for(int i = 0; i < bytes.length;  i+=4){
                   bytes2[i] = bytes[i+3];
                   bytes2[i+1] = bytes[i+2];
                   bytes2[i+2] = bytes[i+1];
                   bytes2[i+3] = bytes[i];
           }
           return bytes2;
 }

 public static void main(String[] args) {

         //System.out.println(prettyPrintByteArray(chunkEndianSwitch(hexStrToData(h1))));
         System.out.println("Big Endian data " + data);
         System.out.println("Big Endian target " + target);
         targetBuf = hexStrToData(target);
         dataBuf = hexStrToData(data);
         targetBufLE = endianSwitch(targetBuf);
         dataBufLE   = chunkEndianSwitch(dataBuf);
         System.out.print("Little Endian data ");
         System.out.println(prettyPrintByteArray(dataBufLE));
         System.out.print("Little Endian target ");
         System.out.println(prettyPrintByteArray(targetBufLE));
 }
}

/* TO COMPILE IT AND RUN:
 * javac A.java
 * jar cvf A.jar A.class
 * java -cp A.jar A
 *
 */
 
 /* RESULTS
 * 
 * Big Endian data 0000000105e9a54b7f65b46864bc90f55d67cccd8b6404a02f5e064a6df69282adf6e2e5f7f953b0632b25b099858b717bb7b24084148cfa841a89f106bc6b655b18d2ed4ebb191a1d018ea700000000000000800000000000000000000000000000000000000000000000000000000000000000000000000000000080020000
 * Big Endian target 0000000000000000000000000000000000000000000000000000a78e01000000
 * Little Endian data 010000004ba5e90568b4657ff590bc64cdcc675da004648b4a065e2f8292f66de5e2f6adb053f9f7b0252b63718b859940b2b77bfa8c1484f1891a84656bbc06edd2185b1a19bb4ea78e011d00000000800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000280
 * Little Endian target 000000018ea70000000000000000000000000000000000000000000000000000
 */