Script to decode keystrokes for NDHXV BBC

badge.php

<?php
include("hid-table.php");

$keys = file_get_contents("keycodes.txt");
$keys = explode("\n", $keys);
array_pop($keys);

foreach($keys as $k){
	$dec = hexdec($k);
	$clear = $dec ^ hexdec("4E");
	$hex_clear = str_pad(strtoupper(dechex($clear)), 2, '0', STR_PAD_LEFT);
	echo "{$tab[$hex_clear]}\n";
}

hid-table.php

<?php
$tab = [
	"00" => "Reserved (no event indicated)",
	"01" => "Keyboard ErrorRollOver",
	"02" => "Keyboard POSTFail",
	"03" => "Keyboard ErrorUndefined",
	"04" => "Keyboard a and A",
	"05" => "Keyboard b and B",
	"06" => "Keyboard c and C",
	"07" => "Keyboard d and D",
	"08" => "Keyboard e and E",
	"09" => "Keyboard f and F",
	"0A" => "Keyboard g and G",
	"0B" => "Keyboard h and H",
	"0C" => "Keyboard i and I",
	"0D" => "Keyboard j and J",
	"0E" => "Keyboard k and K",
	"0F" => "Keyboard l and L",
	"10" => "Keyboard m and M",
	"11" => "Keyboard n and N",
	"12" => "Keyboard o and O",
	"13" => "Keyboard p and P",
	"14" => "Keyboard q and Q",
	"15" => "Keyboard r and R",
	"16" => "Keyboard s and S",
	"17" => "Keyboard t and T",
	"18" => "Keyboard u and U",
	"19" => "Keyboard v and V",
	"1A" => "Keyboard w and W",
	"1B" => "Keyboard x and X",
	"1C" => "Keyboard y and Y",
	"1D" => "Keyboard z and Z",
	"1E" => "Keyboard 1 and !",
	"1F" => "Keyboard 2 and @",
	"20" => "Keyboard 3 and #",
	"21" => "Keyboard 4 and $",
	"22" => "Keyboard 5 and %",
	"23" => "Keyboard 6 and ^",
	"24" => "Keyboard 7 and &",
	"25" => "Keyboard 8 and *",
	"26" => "Keyboard 9 and (",
	"27" => "Keyboard 0 and )",
	"28" => "Keyboard Return (ENTER)",
	"29" => "Keyboard ESCAPE",
	"2A" => "Keyboard DELETE (Backspace)",
	"2B" => "Keyboard Tab",
	"2C" => "Keyboard Spacebar",
	"2D" => "Keyboard - and (underscore)",
	"2E" => "Keyboard = and +",
	"2F" => "Keyboard [ and {",
	"30" => "Keyboard ] and }",
	"31" => "Keyboard \ and |",
	"32" => "Keyboard Non-US # and ~",
	"33" => "Keyboard ; and :",
	"34" => "Keyboard ' and \"",
	"35" => "Keyboard Grave Accent and Tilde",
	"36" => "Keyboard, and <",
	"37" => "Keyboard . and >",
	"38" => "Keyboard / and ?",
	"39" => "Keyboard Caps Lock",
	"3A" => "Keyboard F1",
	"3B" => "Keyboard F2",
	"3C" => "Keyboard F3",
	"3D" => "Keyboard F4",
	"3E" => "Keyboard F5",
	"3F" => "Keyboard F6",
	"40" => "Keyboard F7",
	"41" => "Keyboard F8",
	"42" => "Keyboard F9",
	"43" => "Keyboard F10",
	"44" => "Keyboard F11",
	"45" => "Keyboard F12",
	"46" => "Keyboard PrintScreen",
	"47" => "Keyboard Scroll Lock",
	"48" => "Keyboard Pause",
	"49" => "Keyboard Insert",
	"4A" => "Keyboard Home",
	"4B" => "Keyboard PageUp",
	"4C" => "Keyboard Delete Forward",
	"4D" => "Keyboard End",
	"4E" => "Keyboard PageDown",
	"4F" => "Keyboard RightArrow",
	"50" => "Keyboard LeftArrow",
	"51" => "Keyboard DownArrow",
	"52" => "Keyboard UpArrow",
	"53" => "Keypad Num Lock and Clear",
	"54" => "Keypad /",
	"55" => "Keypad *",
	"56" => "Keypad -",
	"57" => "Keypad +",
	"58" => "Keypad ENTER",
	"59" => "Keypad 1 and End",
	"5A" => "Keypad 2 and Down Arrow",
	"5B" => "Keypad 3 and PageDn",
	"5C" => "Keypad 4 and Left Arrow",
	"5D" => "Keypad 5",
	"5E" => "Keypad 6 and Right Arrow",
	"5F" => "Keypad 7 and Home",
	"60" => "Keypad 8 and Up Arrow",
	"61" => "Keypad 9 and PageUp",
	"62" => "Keypad 0 and Insert",
	"63" => "Keypad . and Delete",
	"64" => "Keyboard Non-US \ and |",
	"65" => "Keyboard Application",
	"66" => "Keyboard Power",
	"67" => "Keypad =",
	"68" => "Keyboard F13",
	"69" => "Keyboard F14",
	"6A" => "Keyboard F15",
	"6B" => "Keyboard F16",
	"6C" => "Keyboard F17",
	"6D" => "Keyboard F18",
	"6E" => "Keyboard F19",
	"6F" => "Keyboard F20",
	"70" => "Keyboard F21",
	"71" => "Keyboard F22",
	"72" => "Keyboard F23",
	"73" => "Keyboard F24",
	"74" => "Keyboard Execute",
	"75" => "Keyboard Help",
	"76" => "Keyboard Menu",
	"77" => "Keyboard Select",
	"78" => "Keyboard Stop",
	"79" => "Keyboard Again",
	"7A" => "Keyboard Undo",
	"7B" => "Keyboard Cut",
	"7C" => "Keyboard Copy",
	"7D" => "Keyboard Paste",
	"7E" => "Keyboard Find",
	"7F" => "Keyboard Mute",
	"80" => "Keyboard Volume Up",
	"81" => "Keyboard Volume Down",
	"82" => "Keyboard Locking Caps Lock",
	"83" => "Keyboard Locking Num Lock",
	"84" => "Keyboard Locking Scroll Lock",
	"85" => "Keypad Comma",
	"86" => "Keypad Equal Sign",
	"87" => "Keyboard International1",
	"88" => "Keyboard International2",
	"89" => "Keyboard International3",
	"8A" => "Keyboard International4",
	"8B" => "Keyboard International5",
	"8C" => "Keyboard International6",
	"8D" => "Keyboard International7",
	"8E" => "Keyboard International8",
	"8F" => "Keyboard International9",
	"90" => "Keyboard LANG1",
	"91" => "Keyboard LANG2",
	"92" => "Keyboard LANG3",
	"93" => "Keyboard LANG4",
	"94" => "Keyboard LANG5",
	"95" => "Keyboard LANG6",
	"96" => "Keyboard LANG7",
	"97" => "Keyboard LANG8",
	"98" => "Keyboard LANG9",
	"99" => "Keyboard Alternate Erase",
	"9A" => "Keyboard SysReq/Attention",
	"9B" => "Keyboard Cancel",
	"9C" => "Keyboard Clear",
	"9D" => "Keyboard Prior",
	"9E" => "Keyboard Return",
	"9F" => "Keyboard Separator",
	"A0" => "Keyboard Out",
	"A1" => "Keyboard Oper",
	"A2" => "Keyboard Clear/Again",
	"A3" => "Keyboard CrSel/Props",
	"A4" => "Keyboard ExSel",
	"E0" => "Keyboard LeftControl",
	"E1" => "Keyboard LeftShift",
	"E2" => "Keyboard LeftAlt",
	"E3" => "Keyboard Left GUI",
	"E4" => "Keyboard RightControl",
	"E5" => "Keyboard RightShift",
	"E6" => "Keyboard RightAlt",
	"E7" => "Keyboard Right GUI" ];