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steg-of-the-dump.js
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steg-of-the-dump.js
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(function($){
"use strict";
var $encode_tweet, $encode_secret, $encode_result, $tweet_length, $encode_result_status, $hidden_length, $hidden_message_length,
$decode_tweet, $decode_secret,
maxlength = 140,
init = function(){
$encode_tweet = $("#encode_tweet") .keyup(encode_update).keypress(encode_update).change(encode_update);
$encode_secret = $("#encode_secret").keyup(encode_secret_update).keypress(encode_update).change(encode_update).blur(set_to_lowercase);
$encode_result = $("#encode_result").focus(only_allow_selection);
$decode_tweet = $("#decode_tweet") .keyup(decode_update).change(decode_update);
$decode_secret = $("#decode_secret").focus(only_allow_selection);
$tweet_length = $("#tweet_length");
$hidden_length = $("#hidden_length");
$hidden_message_length = $("#hidden_message_length");
$encode_result_status = $("#encode_result_status");
secret_alphabet_bitlength = secret_alphabet.length.toString(2).length;
update_homoglyph_lookup();
encode_update();
$decode_tweet.val($encode_result.val());
decode_update();
$("#valid_hidden_message_characters").text(secret_alphabet_string);
$(".secret_alphabet_bitlength").text(secret_alphabet_bitlength);
},
encode_tweet_update = function(){
encode_update();
},
encode_secret_update = function(event){
var character_code = event.which,
character = String.fromCharCode(character_code).toLowerCase();
if(secret_alphabet.indexOf(character) === -1 && editing_keys.indexOf(character_code) === -1) {
event.preventDefault();
return;
}
encode_update();
},
encode_update = function(){
var tweet = $encode_tweet.val(),
secret = $encode_secret.val().toLowerCase() + " ",
secret_binary = "",
character,
character_code_in_decimal,
character_code_in_hexadecimal,
secret_alphabet_index,
secret_character_binary,
result = "",
homoglyph,
homoglyph_options,
homoglyph_options_bitlength,
secret_binary_to_encode,
secret_binary_to_encode_in_decimal,
tweet_covertext_chars = 0,
i;
//if(tweet.length < maxlength && maxlength - tweet.length > 0) {
// tweet += new Array(maxlength - tweet.length).join(" ");
//}
for(i = 0; i < secret.length; i++){
character = secret[i];
secret_alphabet_index = secret_alphabet.indexOf(character);
if(secret_alphabet_index >= 0) {
secret_character_binary = zeropad(secret_alphabet_index.toString(2), secret_alphabet_bitlength);
if(secret_character_binary.length !== secret_alphabet_bitlength) {
console.log("ERROR: binary representation of character too big!", secret_alphabet_index.toString(2), " zeropadded to ", zeropad(secret_alphabet_index.toString(2), secret_alphabet_bitlength));
}
secret_binary += secret_character_binary;
} else {
console.log("ERROR: secret contains invalid character '" + character + "' Ignored.");
}
}
secret_binary = ensure_secret_binary_divisible_by_alphabet_bitlength(secret_binary);
for(i = 0; i < tweet.length; i++){
character = tweet[i];
homoglyph = homoglyphs[character];
if(homoglyph !== undefined){
homoglyph_options = homoglyph.slice(0);
homoglyph_options_bitlength = (homoglyph_options.length + 1).toString(2).length - 1;
tweet_covertext_chars += homoglyph_options_bitlength;
if(secret_binary.length > 0){
secret_binary_to_encode = secret_binary.substr(0, homoglyph_options_bitlength);
//if(secret_binary_to_encode.length < secret_alphabet_bitlength) {
// secret_binary_to_encode = zeropad(secret_binary_to_encode, secret_alphabet_bitlength);
//}
secret_binary = secret_binary.substr(homoglyph_options_bitlength);
secret_binary_to_encode_in_decimal = parseInt(secret_binary_to_encode, 2);
if(secret_binary_to_encode_in_decimal > 0) {
character_code_in_hexadecimal = homoglyph_options[secret_binary_to_encode_in_decimal - 1];
character_code_in_decimal = parseInt(character_code_in_hexadecimal, 16);
character = String.fromCharCode(character_code_in_decimal);
}
//console.log("Encoding ", secret_binary_to_encode, " by making ", tweet[i], "(" + tweet.charCodeAt(i) + ") into ", character + " (" + character.charCodeAt(0) + ").", homoglyph_options);
}
}
result += character;
}
if(secret_binary.length > 0) {
$encode_result.parent().addClass("unable-to-cover-text");
$encode_result_status.show();
} else {
$encode_result.parent().removeClass("unable-to-cover-text");
$encode_result_status.hide();
}
$encode_result.val(result);
$decode_tweet.val(result);
$tweet_length.text(" (length: " + result.length + ")");
$hidden_message_length.text(" (length: " + secret.length + ")")
$hidden_length.text(" (allows Hidden Message length " + Math.ceil(tweet_covertext_chars / secret_alphabet_bitlength) + ")");
decode_update();
},
ensure_secret_binary_divisible_by_alphabet_bitlength = function(secret_binary){
if(secret_binary % secret_alphabet_bitlength > 0) {
secret_binary += zeropad("0", secret_alphabet_bitlength - (secret_binary % secret_alphabet_bitlength));
}
return secret_binary;
},
set_to_lowercase = function(){
$(this).val($(this).val().toLowerCase());
},
only_allow_selection = function(){
var $this = $(this);
$this.select();
$this.mouseup(function() {
$this.unbind("mouseup");
return false;
});
},
decode_update = function(){
var tweet = $decode_tweet.val(),
character,
character_code,
secret_binary = "",
secret_character_in_binary,
secret_character_in_decimal,
secret_character,
result = "",
i;
//console.log(homoglyphs_lookup);
for(i = 0; i < tweet.length; i++){
character = tweet.substr(i, 1);
if(homoglyphs_lookup[character]) {
secret_binary += homoglyphs_lookup[character];
}
}
secret_binary = ensure_secret_binary_divisible_by_alphabet_bitlength(secret_binary);
//console.log(secret_binary);
while(secret_binary.length > 0){
secret_character_in_binary = secret_binary.substr(0, secret_alphabet_bitlength);
if(secret_character_in_binary.length > 0) {
secret_character_in_binary = zeropad(secret_character_in_binary, secret_alphabet_bitlength);
if(secret_character_in_binary.length !== secret_alphabet_bitlength) {
console.log("ERROR: Unable to extract 5 characters (zeropadded) from string. ", secret_binary.substr(i, secret_alphabet_bitlength), zeropad(secret_binary.substr(i, secret_alphabet_bitlength), secret_alphabet_bitlength));
}
secret_character_in_decimal = parseInt(secret_character_in_binary, 2);
if(secret_alphabet[secret_character_in_decimal]) {
result += secret_alphabet[secret_character_in_decimal];
} else {
//console.log("ERROR: Unable to find secret alphabet character at position", secret_character_in_decimal);
}
}
secret_binary = secret_binary.substr(secret_alphabet_bitlength);
}
$decode_secret.val(result);
},
zeropad = function(value, length){
return (new Array(length).join("0") + value).substr(-length, length);
},
editing_keys = [8, 46], // backspace, delete etc
secret_alphabet_string = " abcdefghijklmnopqrstuvwxyz123456789'0.:/\\%-_?&;",
secret_alphabet = secret_alphabet_string.split(""),
secret_alphabet_bitlength,
homoglyphs_lookup,
update_homoglyph_lookup = function(){
homoglyphs_lookup = {};
$.each(homoglyphs, function(character, homoglyph_options){
var i,
homoglyph_option,
homoglyph_option_character,
homoglyph_options_bitlength;
homoglyph_options_bitlength = (homoglyph_options.length + 1).toString(2).length - 1;
homoglyphs_lookup[character] = zeropad("0", homoglyph_options_bitlength);
for(i = 0; i < homoglyph_options.length; i++){
homoglyph_option = homoglyph_options[i];
homoglyph_option_character = String.fromCharCode(parseInt(homoglyph_option, 16));
homoglyphs_lookup[homoglyph_option_character] = zeropad((i + 1).toString(2), homoglyph_options_bitlength);
}
});
},
homoglyphs = {
"!":["FF01"],
'"':["FF02"],
"$":["FF04"],
"%":["FF05"],
"&":["FF06"],
"'":["FF07"],
"(":["FF08"],
")":["FF09"],
"*":["FF0A"],
"+":["FF0B"],
",":["FF0C"],
"-":["FF0D"],
".":["FF0E"],
"/":["FF0F"],
"0":["FF10"],
"1":["FF11"],
"2":["FF12"],
"3":["FF13"],
"4":["FF14"],
"5":["FF15"],
"6":["FF16"],
"7":["FF17"],
"8":["FF18"],
"9":["FF19"],
":":["FF1A"],
";":["FF1B"],
"<":["FF1C"],
"=":["FF1D"],
">":["FF1E"],
"?":["FF1F"],
"@":["FF20"],
"A":["FF21","0391","0410"],
"B":["FF22","0392","0412"],
"C":["FF23","03F9","216D"],
"D":["FF24"],
"E":["FF25","0395","0415"],
"F":["FF26"],
"G":["FF27"],
"H":["FF28","0397","041D"],
"I":["FF29","0399","0406"],
"J":["FF2A"],
"K":["FF2B","039A","212A"],
"L":["FF2C"],
"M":["FF2D","039C","041C"],
"N":["FF2E"],
"O":["FF2F","039F","041E"],
"P":["FF30","03A1","0420"],
"Q":["FF31"],
"R":["FF32"],
"S":["FF33"],
"T":["FF34","03A4","0422"],
"U":["FF35"],
"V":["FF36","0474","2164"],
"W":["FF37"],
"X":["FF38","03A7","2169"],
"Y":["FF39","03A5","04AE"],
"Z":["FF3A"],
"[":["FF3B"],
"\\":["FF3C"],
"]":["FF3D"],
"^":["FF3E"],
"_":["FF3F"],
"`":["FF40"],
"a":["FF41"],
"b":["FF42"],
"c":["FF43","03F2","0441"],
"d":["FF44"],
"e":["FF45"],
"f":["FF46"],
"g":["FF47"],
"h":["FF48"],
"i":["FF49","0456","2170"],
"j":["FF4A"],
"k":["FF4B"],
"l":["FF4C"],
"m":["FF4D"],
"n":["FF4E"],
"o":["FF4F","03BF","043E"],
"p":["FF50"],
"q":["FF51"],
"r":["FF52"],
"s":["FF53"],
"t":["FF54"],
"u":["FF55"],
"v":["FF56","03BD","2174"],
"w":["FF57"],
"x":["FF58","0445","2179"],
"y":["FF59"],
"z":["FF5A"],
"{":["FF5B"],
"|":["FF5C"],
"}":["FF5D"],
"~":["FF5E"],
" ":["2000","2001","2002","2003","2004","2005","2006","2007","2008","2009","200A","2028","2029","202F","205F"]
};
$(document).ready(init);
}(jQuery));