//--------------------------------------
//--- 010 Editor v3.0.3 Script File
//
// File: XORSelection.1sc
// Author: SweetScape Software, update Didier Stevens (https://DidierStevens.com)
// Revision: 2.0
// Purpose: Xors the current selection
//    with a set of bytes, which causes
//    the bytes to be encoded so they 
//    cannot be read by a human. Run the 
//    Xor again on the encoded selection to 
//    decode the data.
//--------------------------------------

int i, iStart, size, iKeyLength;
string sKey;

// Check that a file is open
if( FileCount() == 0 )
{
    MessageBox( idOk, "XORSelection", "XORSelection can only be executed when a file is loaded." );
    return -1;
}

// Initializes the variables
size = GetSelSize();
iStart = GetSelStart();

// Check that bytes were selected
if( size == 0 )
{
    MessageBox( idOk, "XORSelection", "Please select bytes before running this script." );
    return -1;
}

sKey = InputString("XORSelection", "Input the XOR key", "");
if (sKey == "")
{
    MessageBox(idOk, "XORSelection", "Please enter a valid key.");
    return -1;
}
iKeyLength = Strlen(sKey);

// Modify the selection
for (i = 0; i < size; i++)
    // Modify the current byte
    WriteUByte(iStart + i, ReadUByte(iStart + i) ^ sKey[i % iKeyLength]);