Regeistered hash

-- Function to calculate MD5 hash
function calculateMD5(content)
    -- Use the md5 library or implementation of your choice
    -- Example: https://github.com/kikito/md5.lua
    local md5 = require("md5")
    return md5.sumhexa(content)
end

-- Function to check if a disk is registered
function isDiskRegistered()
    local diskLabel = os.getComputerLabel() or "UnknownDisk"

    -- Check if registered.txt exists
    if fs.exists("/"..diskLabel.."/registered.txt") then
        local file = fs.open("/"..diskLabel.."/registered.txt", "r")
        local content = file.readAll()
        file.close()

        -- Replace the hash value with the correct one
        local correctHash = "0f341991f07ba45cef793234f651bf24"

        -- Check if the hash matches
        if calculateMD5(content) == correctHash then
            return true
        else
            print("ERROR: Invalid hash in registered.txt")
        end
    else
        print("ERROR: registered.txt not found")
    end

    return false
end

-- Main program
if isDiskRegistered() then
    print("Disk is registered. Running allowed.")
    -- Your main code goes here
else
    print("Disk is not registered. Running blocked.")
end