Ghidra script to XOR two arbitrary size regions of memory together and write the resulting buffer somewhere. *dest = *src_1 ^ *src_2

XORRegions.java

// XOR two memory regions together and write result at a third location.
//@author bsmt
//@category Memory
//@keybinding 
//@menupath 
//@toolbar 

import ghidra.app.script.GhidraScript;
import ghidra.program.model.util.*;
import ghidra.program.model.reloc.*;
import ghidra.program.model.data.*;
import ghidra.program.model.block.*;
import ghidra.program.model.symbol.*;
import ghidra.program.model.scalar.*;
import ghidra.program.model.mem.*;
import ghidra.program.model.listing.*;
import ghidra.program.model.lang.*;
import ghidra.program.model.pcode.*;
import ghidra.program.model.address.*;

public class XORRegions extends GhidraScript {

    public void run() throws Exception {	
	monitor.setIndeterminate(false);
	monitor.setShowProgressValue(true);
	
	Address region_0 = askAddress("XORRegions", "First region address:");
    	Address region_1 = askAddress("XORRegions", "Second region address:");
	Address dest = askAddress("XORRegions", "Destination address:");
	int size = askInt("XORRegions", "Region size (in bytes):");
	
	Memory memory = currentProgram.getMemory();

	printf("XORRegions: Doing %d byte %s = %s ^ %s\n", size,
		dest.toString(), region_0.toString(), region_1.toString());
	monitor.setMaximum((long)size);
	monitor.setProgress((long)0.0);

	for (int i = 0; i < size; ++i) {
		if(monitor.isCancelled()) {
			break;
		}
		Address addr_0 = region_0.add((long)i);
		Address addr_1 = region_1.add((long)i);
		Address dest_addr = dest.add((long)i);
		byte byte_0 = memory.getByte(addr_0);
		byte byte_1 = memory.getByte(addr_1);
		byte dest_byte = (byte)(byte_0 ^ byte_1);
		//printf("%s (%x) = %s (%x) ^ %s (%x)\n", dest_addr.toString(),
		//	dest_byte, addr_0.toString(), byte_0,
		//	addr_1.toString(), byte_1);
		memory.setByte(dest_addr, dest_byte);
		monitor.setProgress((long)i);
	}

	// don't set comment if there is something already there,
	// just so we don't clobber anything.	
	// could probably just append it to the existing comment but meh
	if (getPlateComment(dest) == null) {
		setPlateComment(dest,
			String.format(("This %d byte region does not reflect the inital state.\n" +
			"It has been overwritten with a computed XOR of *%s ^ *%s"),
			size, region_0.toString(), region_1.toString()));
	}
	// TODO: maybe rename the destination region to LABEL_xored or something if it has a label
    }

}