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<html>
<head>
<meta charset="UTF-8">
<title>SmallTalk.page -- Protect Your Small Talk</title>
<link rel="icon" type="image/png" href="shhh.png" />
<link rel="canonical" href="https://smalltalk.page/" />
<meta property="og:title" content="." />
<meta property="og:description" content="." />
<meta property="og:image" content="https://smalltalk.page/shhh.png" />
<!--Let browser know website is optimized for mobile-->
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<!-- Materialize -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/css/materialize.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/js/materialize.min.js"></script>
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<!-- Global site tag (gtag.js) - Google Analytics -->
<script async src="https://www.googletagmanager.com/gtag/js?id=UA-125586496-1"></script>
<script>
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', 'UA-125586496-1');
</script>
<script src="https://code.jquery.com/jquery-3.3.1.min.js"
integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8="
crossorigin="anonymous"></script>
<!-- crypto libs -->
<script type="text/javascript" src="https://cdn.rawgit.com/ricmoo/aes-js/e27b99df/index.js"></script>
<script type="text/javascript" src="https://rawgit.com/emn178/js-sha256/master/build/sha256.min.js"></script>
<script src="i18n.js"></script>
<style>
.inline {
display: inline;
}
</style>
</head>
<body><div class="container">
<h2 class="inline"><a href="https://smalltalk.page">SmallTalk.page</a></h2>
<!-- hidden image for search engine or bots for snippet -->
<img src="shhh.png" width=0 height=0 />
<h5 class="right">
<a href="https://www.facebook.com/shhh.pw" target="_blank">
<img width=30 src="f-ogo_RGB_HEX-58.png" />
</a>
<a href="https://play.google.com/store/apps/details?id=pw.shhh.shhh" target="_blank">
<i class="small material-icons">android</i>
</a>
<a href="mailto:yjlou.tw@gmail.com" target="_blank">
<i class="small material-icons">email</i>
</a>
</h5>
<h5><span id="short_desc">SmallTalk an online tool to do end-to-end and all-client-side encryption</span>
<a id="read_more" href="#">... more</a><span id="more_0"><span id="detail_0">.
It is perfect to be used to exchange confidential or secret information
with another person or a group of people. The pre-defined password
is the only key able to decrypt the encrypted messages.</span></span></h5>
<span id="more_1">
<h5 id="detail_1">A person having the URL you sent but not having the password cannot
decrypt the message. This menas your ISP, government, and the court
cannot decrypt it. Since we don't save your password, even we cannot
decrypt your message.</h5>
<h5><span id="detail_2_0">You can find the full source code on</span>
<a href="https://github.com/yjlou/smalltalk">github</a>
<span id="detail_2_1">. Includes Javascript and Android App code.</h5>
<h5 id="detail_3">Below is the diagram how your message is encrypted and decrypted.</h5>
<h5><img width="100%" src="encryption.png"></h5>
<h5 id="detail_4">Some highlights are listed below:</h5>
<ul>
<li id="detail_4_0">+ The hint message is optional, which is used to remind the receiver what the password is. Note that it is NOT encrypted.
<li id="detail_4_1">+ The password is pre-defined by both sender and receiver. Or a secret known by both sides.
<li id="detail_4_2">+ A random IV is generated while encrypted. It is used not only for hashing the encrypt/decrypt keys, but also for block cipher.
<li id="detail_4_3">+ The encrypt key is hashed by the IV and pre-defined password so that even the same password is used with other people, the key is still different.
<li id="detail_4_4">+ The same IV is also used in block cipher to increase the attack difficulty.
<li id="detail_4_5">+ The encrypted message and IV are transmitted via your regular chat apps, for example, Messenger, Whatsapp, WeChat ... It is just an encrypted URL.
<li id="detail_4_6">+ The URL will lead the receiver to the decryption page.
<li id="detail_4_7">+ All the receiver need to do is typing the pre-defined password.
<li id="detail_4_8">+ Then, the original message is decrypted on the receiver side.
<li id="detail_4_9">+ The receiver can reply the message by doing the same procedure with either the same or a different password.
</ul>
<h5 id="detail_5">Warning: there might be still some weaknesses in the communication. For example,
a browser extension with the ability to read the full content of the HTML page
can still read your information. Turn off those extensions if you have concerns.</h5>
</span>
<div id="dec_div">
<div id="decrypt_prompt">
<h4 id="i18n_decrypt">Decrypt</h4>
<!-- invisible -->
<textarea id="cipher_hex" rows="4" cols="80"></textarea>
<input type=text id="dec_iv_hex" value="The IV">
<div class="row">
<div class="input-field col s12">
<h5><span id="dec_hint_desc">Hint: </span><span id="dec_hint"></span></h5>
</div>
</div>
<div class="row">
<div class="input-field col s6">
<input type=password id="dec_pwd">
<label id="i18n_dec_pwd" for="dec_pwd">Enter your password here</label>
</div>
<div class="input-field col s2">
<button id="btn_dec_visible" class="btn waves-effect waves-light" type="submit">
<i class="small material-icons">visibility</i>
</button>
<button id="btn_dec_invisible" class="btn waves-effect waves-light" type="submit">
<i class="small material-icons">visibility_off</i>
</button>
</div>
<div class="input-field col s4">
<button id="btn_decrypt" class="btn waves-effect waves-light"
type="submit">
Decrypt
</button>
</div>
</div>
</div>
<div id="decrypted_div">
<div class="row">
<div class="input-field col s12">
<h4 id="i18n_descrypted_text">Decrypted Text:</h4>
</div>
</div>
<div class="row">
<div class="input-field col s8 m10">
<textarea id="decrypted_text" class="materialize-textarea"
rows="4" cols="80" readonly></textarea>
</div>
<div class="input-field col s2 m1">
<button id="btn_refresh" class="btn waves-effect waves-light"
type="submit" name="action">
<i class="small material-icons">refresh</i>
</div>
<div class="input-field col s2 m1">
<button id="btn_copy_decrypted" class="btn waves-effect waves-light"
type="submit" name="action">
<i class="small material-icons">content_copy</i>
</div>
</div>
<div class="row">
<div class="input-field col s12">
<button id="btn_reply" class="btn waves-effect waves-light"
type="submit"> Reply </button>
</div>
</div>
</div>
</div>
<div id="enc_div">
<h4 id="enc_h2_encrypt" class="row col s12">Encrypt</h4>
<h4 id="enc_h2_reply" class="row col s12">Reply</h4>
<div class="row">
<div class="input-field col s12">
<textarea id="plain_text" class="materialize-textarea"
rows="4" cols="80"></textarea>
<label id="i18n_plain_text" for="plain_text">
* Enter the text you want to send (can be multiple lines)
</label>
</div>
</div>
<div class="row">
<div class="input-field col s12">
<input id="enc_hint" type=text class="validate">
<label id="i18n_enc_hint" for="enc_hint">Hint of password. Will be prompted to receiver.
Not encrypted.</label>
</div>
</div>
<div class="row">
<div class="input-field col s6">
<input id="enc_pwd" type=password class="validate">
<label id="i18n_enc_pwd" for="enc_pwd">* Enter your password here</label>
</div>
<div class="input-field col s2">
<button id="btn_enc_visible" class="btn waves-effect waves-light" type="submit">
<i class="small material-icons">visibility</i>
</button>
<button id="btn_enc_invisible" class="btn waves-effect waves-light" type="submit">
<i class="small material-icons">visibility_off</i>
</button>
</div>
<div class="input-field col s4">
<button id="btn_encrypt" class="btn waves-effect waves-light"
type="submit"> Encrypt </button>
</div>
</div>
<div id="url_div" class="row">
<div class="input-field col s10">
<input type=text id="url_for_share" readonly
value="URL for share is not generated yet.">
<label id="i18n_url_for_share" for "url_for_share">URL for share</label>
</div>
<div class="input-field col s2">
<button id="btn_copy_url" class="btn waves-effect waves-light"
type="submit" name="action">
<i class="small material-icons">content_copy</i>
</div>
</div>
</div>
<script>
// Messages used to notify user.
var i18n_url_copied = "URL copied.";
var i18n_no_enc_key = "Encrypt key is not provided yet!";
var i18n_gen_too_long = "The generated URL is too long. You still can copy the URL, but the receiver may not completely decode it.";
var i18n_shorten_failed = "Cannot shorten the URL. ";
// Credits: https://hackernoon.com/copying-text-to-clipboard-with-javascript-df4d4988697f
// For iOS hack: https://stackoverflow.com/questions/34045777/copy-to-clipboard-using-javascript-in-ios
function copyToClipboard(str) {
const el = document.createElement('textarea');
el.value = str;
document.body.appendChild(el);
if (navigator.userAgent.match(/ipad|ipod|iphone/i)) {
// For iOS only.
var range = document.createRange();
el.contentEditable = true;
el.readOnly = false;
range.selectNodeContents(el);
var s = window.getSelection();
s.removeAllRanges();
s.addRange(range);
el.setSelectionRange(0, 999999); // A big number, to cover anything that could be inside
// the element.
} else {
// For other moderm browers.
el.select();
}
document.execCommand('copy');
document.body.removeChild(el);
}
// from somewhere in stackoverflow
var getUrl = function(href) {
// Given a relative path or parameters, returns an A object of that.
var l = document.createElement("a");
l.href = href;
if (!l.href || l.href.startsWith("externalfile")) {
// The local developping code. At least we can append the query string to the URL.
return href;
} else {
// The normal case. 'l' is a URL.
return l.href;
}
};
function ShortenUrl(long_url, func) {
// Ask the shortener service to return a short URL.
//
// Args:
// long_url: the URL to compress.
// func: callback in response.
// (status_code, short_url)
//
// If this is http or a local developping code, use http instead.
if (location.protocol == 'https:') {
var protocol = "https://api-ssl";
} else {
var protocol = "http://api";
}
$.getJSON(protocol + ".bitly.com/v3/shorten?callback=?", {
"format": "json",
"apiKey": "R_f384bb9a1d1248f4a12e72a07b98f7e2",
"login": "o_67j98qnsjg",
"longUrl": long_url
}, function(resp) {
// resp:
// data:
// global_hash: "2OWGqDd"
// hash: "2OWGqmH"
// long_url: "https://smalltalk.page/?iv=1232"
// new_hash: 1
// url: "http://bit.ly/2OWGqmH"
// status_code: 200
// status_txt: "OK"
func(resp.status_code, resp.data.url);
}
)
}
// Maintains the toggle-able buttons.
function Toggleable(btn_on, btn_off, is_on, updated) {
// Args:
// btn_on: the jQuery object of ON.
// btn_off: the jQuery object of OFF.
// is_on: function returning true if the status is ON.
// updated(on): callback function when state changed.
// If the new state is ON, then |on| is set to true.
var self_ = this;
this.btn_on_ = btn_on;
this.btn_off_ = btn_off;
this.is_on_ = is_on;
this.updated_ = updated;
this.setOn = function() {
self_.btn_off_.hide();
self_.btn_on_.show();
self_.updated_(true);
};
this.setOff = function() {
self_.btn_on_.hide();
self_.btn_off_.show();
self_.updated_(false);
};
this.update = function() {
if (self_.is_on_()) {
self_.setOn();
} else {
self_.setOff();
}
};
// Mouse click events.
self_.btn_on_.click(function() {
self_.setOff();
return false; // for submit type.
});
self_.btn_off_.click(function() {
self_.setOn();
return false; // for submit type.
});
// Init
self_.update();
}
function Visibility(pwd, btn_on, btn_off) {
// Args:
// pwd: a jQuery object of the password field.
// btn_on: a jQuery object of the ON.
// btn_off: a jQuery object of the OFF.
var self_ = this;
this.pwd_ = pwd;
this.btn_on_ = btn_on;
this.btn_off_ = btn_off;
var toggleable = new Toggleable(btn_on, btn_off,
function() { // is_on
return (self_.pwd_.attr("type") != "password");
},
function(on) { // updated
if (on) {
self_.pwd_.attr("type", "text");
} else {
self_.pwd_.attr("type", "password");
}
}
);
}
function EnforceHttps() {
// Redirect to HTTPS (for geo location API). For non-local file and non-192.168. hosts.
if (location.protocol == 'http:' && !location.hostname.startsWith("192.168.")) {
location.href = 'https:' + window.location.href.substring(window.location.protocol.length);
}
}
EnforceHttps();
// Visible button for Encrypt password.
var enc_visibility = new Visibility($("#enc_pwd"), $("#btn_enc_visible"), $("#btn_enc_invisible"));
var dev_visibility = new Visibility($("#dec_pwd"), $("#btn_dec_visible"), $("#btn_dec_invisible"));
// https://stackoverflow.com/questions/8486099/how-do-i-parse-a-url-query-parameters-in-javascript
function getJsonFromUrl() {
// Returns URL parameters in JSON form.
// If the info are carried in hashtag, use it.
var hash = window.location.hash;
if (hash) {
var query = hash.substr(1);
} else {
// Otherwise, use it from the parameters.
var query = location.search.substr(1);
}
console.log("The query string retried: " + query);
var result = {};
query.split("&").forEach(function(part) {
var item = part.split("=");
result[item[0]] = decodeURIComponent(item[1]);
});
return result;
}
var params = getJsonFromUrl();
// Auto-select-all when click on text box and area.
$("input:text").focus(function() { $(this).select(); } );
$("textarea").focus(function() { $(this).select(); } );
// Initial UI state.
$("#enc_div").hide();
$("#dec_div").hide();
$("#decrypted_div").hide();
$("#cipher_hex").hide();
$("#dec_iv_hex").hide();
$("#more_0").hide();
$("#more_1").hide();
$("#enc_h2_reply").hide();
$("#url_div").hide();
if (!params["cipher_hex"]) {
// Encrypt, display Cipher section.
$("#enc_div").show();
$("#plain_text").focus();
} else {
// Decrypt. Display De-cipher section.
$("#dec_div").show();
$("#dec_pwd").focus();
// Parse cipher text from URL parameter and fill into |cipher_hex|.
$("#cipher_hex").val(params["cipher_hex"]);
$("#dec_iv_hex").val(params["iv_hex"]);
if (params["hint"]) {
$("#dec_hint").text(params["hint"]);
} else {
// No hint provided. Don't show the description of hint.
$("#dec_hint_desc").hide();
}
}
function gen_iv() {
// Returns an array of integers (16-byte).
var iv = [];
for (var i = 0; i < 16; i++) {
iv.push(Math.floor(Math.random() * 256));
}
return iv;
}
function hash256(msg) {
// Returns an array of integers (32-byte).
var hash = sha256.create();
hash.update(msg);
return hash.digest();
}
function block_enc(msg) {
// Returns 16-byte blocks with length info and padding
var len = msg.length;
var output = [len % 256, Math.floor(len / 256)].concat(Array.from(msg)); // little-endian
for(var i = 0; (16 - (i < output.length % 16)) % 16; i++) {
output.push(i);
}
return output;
}
function block_dec(msg) {
// Returns a string
var len = msg[0] + msg[1] * 256;
return aesjs.utils.utf8.fromBytes(msg.slice(2, 2 + len));
}
function btn_encrypt_clicked() {
// Check key is input already.
var enc_pwd = $("#enc_pwd").val();
if (!enc_pwd) {
M.toast({html: i18n_no_enc_key, displayLength: 3000});
return;
}
// Encrypt the message.
var plain_text = aesjs.utils.utf8.toBytes($("#plain_text").val());
var iv_bytes = gen_iv();
var iv_hex = aesjs.utils.hex.fromBytes(iv_bytes);
var enc_key = hash256(aesjs.utils.utf8.toBytes(enc_pwd) + iv_bytes);
var aesCbc = new aesjs.ModeOfOperation.cbc(enc_key, iv_bytes);
var encrypted_bytes = aesCbc.encrypt(block_enc(plain_text));
var encrypted_hex = aesjs.utils.hex.fromBytes(encrypted_bytes);
var hint = encodeURIComponent($("#enc_hint").val());
// Update |cipher_hex|.
$("#cipher_hex").val(encrypted_hex);
$("#dec_iv_hex").val(iv_hex);
// Update the |url_for_share|.
var url_for_share = getUrl(
"#iv_hex=" + iv_hex +
"&cipher_hex=" + encrypted_hex +
"&hint=" + hint);
$("#url_for_share").val(url_for_share);
$("#url_div").show();
// Check the URL length.
actual_len = $("#url_for_share").val().length;
max_url_len = 2053;
if (actual_len > max_url_len) {
M.toast({html: i18n_gen_too_long + 'Must be shorter than [' + max_url_len +
'] bytes, but actually [' + actual_len + '] bytes.', // TODO: i18n
displayLength: 10000});
return;
}
// If this is a local development code, insert the host name before shortening.
if (!url_for_share.startsWith("http")) {
url_for_share = "https://smalltalk.page/" + url_for_share;
}
// Shorten it!
console.log("URL to be shortened: " + url_for_share);
ShortenUrl(url_for_share, function(status, short_url) {
if (status == 200) {
if (0) { // Temporarily disable this feature.
// Rewrite URL for iOS.
// https://bit.ly/GgyY56 --> https://smalltalk.page/302/?GyyG56
var bitly_pos = short_url.search("bit.ly/");
if (bitly_pos >= 0) {
bitly_pos += "bit.ly/".length; // Points to short hash now.
short_url = window.location.protocol + "//" +
window.location.host + "/302/?" +
short_url.substring(bitly_pos);
}
}
$("#url_for_share").val(short_url);
} else {
M.toast({html: i18n_shorten_failed + 'Error code: [' + status + ']',
displayLength: 10000});
return;
}
});
}
function btn_decrypt_clicked() {
// Check key is input already.
var dec_pwd = $("#dec_pwd").val();
if (!dec_pwd) {
alert("Decrypt key is not provided yet!");
return;
}
// Decrypt the message.
var cipher_bytes = aesjs.utils.hex.toBytes($("#cipher_hex").val());
var iv_bytes = aesjs.utils.hex.toBytes($("#dec_iv_hex").val());
var dec_key = hash256(aesjs.utils.utf8.toBytes(dec_pwd) + iv_bytes);
var aesCbc = new aesjs.ModeOfOperation.cbc(dec_key, iv_bytes);
var decrypted_bytes = aesCbc.decrypt(cipher_bytes);
var plain_text = block_dec(decrypted_bytes);
// Fill into the |decrypted_text|.
$("#decrypted_div").show();
$("#decrypted_text").val(plain_text);
M.textareaAutoResize($('#decrypted_text'));
// Hide the key fields.
$("#decrypt_prompt").hide();
}
function btn_reply_clicked() {
$("#enc_div").show();
$("#decrypt_prompt").hide();
$("#btn_reply").hide();
$("#enc_h2_encrypt").hide();
$("#enc_h2_reply").show();
$("#plain_text").focus();
// Pass the password to encryption.
$("#enc_pwd").attr('type', 'password');
$("#enc_pwd").val($("#dec_pwd").val());
// Pass hint field.
$("#enc_hint").val($("#dec_hint").text());
// Update the pre-filled password field.
M.updateTextFields();
}
// Button click events!
$("#btn_encrypt").on( "click", function(event) {
btn_encrypt_clicked();
return false; // not submit the form
});
$("#btn_decrypt").on( "click", function(event) {
btn_decrypt_clicked();
return false;
});
$("#btn_reply").on( "click", function(event) {
btn_reply_clicked();
return false;
});
$("#read_more").on( "click", function(event) {
$("#read_more").hide();
$("#more_0").show();
$("#more_1").show();
return false;
});
$("#btn_copy_url").on( "click", function(event) {
copyToClipboard($("#url_for_share").val());
M.toast({html: i18n_url_copied})
return false;
});
$("#btn_refresh").on( "click", function(event) {
location.reload();
return false;
});
$("#btn_copy_decrypted").on( "click", function(event) {
copyToClipboard($("#decrypted_text").val());
M.toast({html: i18n_url_copied})
return false;
});
// ENTER key pressed.
$("#enc_hint").keypress(function(event) {
if (event.which == 13) {
$("#enc_pwd").focus();
return false;
}
});
$("#enc_pwd").keypress(function(event) {
if (event.which == 13) {
btn_encrypt_clicked();
return false;
}
});
$("#dec_pwd").keypress(function(event) {
if (event.which == 13) {
btn_decrypt_clicked();
return false;
}
});
$(document).ready(function() {
ApplyI18N();
});
</script>
</div><!-- end of container --></body>
</html>