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auto.js
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auto.js
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/*
First part
*/
console.log('Tana launched successfully')
/*
Signatures
*/
// verify authenticity of a message
function verifySigned(message, signature, publicKey) {
var verify = new JSEncrypt();
verify.setPublicKey(publicKey);
var verified = verify.verify(message, signature, CryptoJS.SHA256);
if (verified) {
return true;
}
else {
return false;
}
}
// sign a message
function sign(message, privateKey) {
var sign = new JSEncrypt();
sign.setPrivateKey(privateKey);
var signature = sign.sign(message, CryptoJS.SHA256, "sha256");
return signature;
}
/*
Encrypt / Decrypt
*/
// To avoid bugs with UTF-16 encryption
function utf8_to_b64(stringgg) {
return window.btoa(encodeURIComponent(stringgg))
}
// Decrypt with the private key
function decrypt(message, privateKey, signaturePublicKey) {
var encryptedArray = message[1];
var decryptedArray = [];
var decrypt = new JSEncrypt();
for (var i = (1); i < encryptedArray.length; i++) {
decrypt.setPrivateKey(privateKey);
decryptedArray.push(decrypt.decrypt(encryptedArray[i]));
//return decrypt.decrypt(message);
};
var cyphertext = decodeURIComponent(atob(decryptedArray.join("")));
// signature verification
var messageSignature = String(message[0].join(""));
var sig = signaturePublicKey
var verified = verifySigned(cyphertext, messageSignature, sig);
if (verified == true) {
return cyphertext;
} else {
return "cyphertext is not verified";
};
};
// Encrypt
function encrypt(message, privateKey, publicKey) {
var ciphertext = utf8_to_b64(message);
var response = [];
var encrypt = new JSEncrypt();
// sign the message and insert it in the response array
var signature = [];
signature.push(sign(message, privateKey));
response.push(signature);
// split message in chunks of 240bit
messageLength = ciphertext.length;
var chunks = [];
var chunkSize = 240;
for (var i = 0; i < messageLength; i += chunkSize) {
chunks.push(ciphertext.substr(i, chunkSize));
};
var simple = [];
encrypt.setPublicKey(publicKey);
for (var i = 0; i - 1 < chunks.length; i++) {
simple.push(encrypt.encrypt(chunks[i - 1]));
};
response.push(simple);
return response
};
/*
auto decryption
*/
function autoDecrypt() {
// get the public and private key
var keyPair = browser.storage.local.get();
keyPair.then(onGot, onError);
// if with got them
function onGot(item) {
var localPublicKey = item.publicKey;
var localPrivateKey = item.privateKey;
// decrypt a message from a foreign user
function simpleDecryption() {
var elements = document.getElementsByClassName("tana-simple-decryption");
for (var i = 0; i < elements.length; i++) {
var element = elements[i];
signaturePublicKey = element.getAttribute('public-key');
var message = element.innerHTML;
// encrypt with button
if (element.getAttribute('decrypt-with-button') != null) {
buttonId = element.getAttribute('decrypt-with-button');
var button = document.getElementById(buttonId);
button.addEventListener("click", function () {
var decrypted = decrypt(JSON.parse(message), localPrivateKey, signaturePublicKey);
element.innerHTML = decrypted;
});
} else {
var decrypted = decrypt(JSON.parse(message), localPrivateKey, signaturePublicKey);
element.innerHTML = decrypted;
};
};
};
simpleDecryption();
// decrypt a message from the current user
function ownDecryption() {
var elements = document.getElementsByClassName("tana-own-decryption");
for (var i = 0; i < elements.length; i++) {
var element = elements[i];
var message = element.innerHTML;
// encrypt with button
if (element.getAttribute('decrypt-with-button') != null) {
buttonId = element.getAttribute('decrypt-with-button');
var button = document.getElementById(buttonId);
button.addEventListener("click", function () {
var decrypted = decrypt(JSON.parse(message), localPrivateKey, localPublicKey);
element.innerHTML = decrypted;
});
} else {
// without, autoEncrypt
var decrypted = decrypt(JSON.parse(message), localPrivateKey, localPublicKey);
element.innerHTML = decrypted;
};
};
};
ownDecryption();
// decrypt all elements on multi format
function multiDecryption() {
var divs = document.getElementsByClassName("tana-multi-decryption");
for (var i = 0; i < divs.length; i++) {
var div = divs[i];
var type = div.nodeName;
if (type == "DIV") {
var elements = div.getElementsByClassName("tana-sub-multi-decryption");
var publicKeyUsed = div.getAttribute('public-key');
// encrypt with button
if (div.getAttribute('decrypt-with-button') != null) {
buttonId = div.getAttribute('decrypt-with-button');
var button = document.getElementById(buttonId);
button.addEventListener("click", function () {
for (var j = 0; j < elements.length; j++) {
var element = elements[j];
var message = element.innerHTML;
var decrypted = decrypt(JSON.parse(message), localPrivateKey, publicKeyUsed);
element.innerHTML = decrypted;
};
});
} else {
// decrypt all embedded elements
for (var j = 0; j < elements.length; j++) {
var element = elements[j];
var message = element.innerHTML;
var decrypted = decrypt(JSON.parse(message), localPrivateKey, publicKeyUsed);
element.innerHTML = decrypted;
};
};
}
else {
console.log('[Tana Error]: Wrong type for multi encryption, should be DIV');
};
};
};
multiDecryption();
};
function onError(error) {
console.log(`Error: ${error}`);
};
};
autoDecrypt();
/*
auto encryption
*/
function autoEncrypt() {
//get public and private keys
var keyPair = browser.storage.local.get();
keyPair.then(onGot, onError);
function onGot(item) {
var localPublicKey = item.publicKey;
var localPrivateKey = item.privateKey;
function autoEncryption() {
var form = document.getElementById("tana-encryption-form");
/////////////////////////
var button = form.querySelector('[id="tana-form-encrypt"]');
var receiverPublicKey = form.querySelector('[name="tana-public-key"]');
// once submit is clicked
button.addEventListener("click", function () {
if (form != null) {
console.log("auto encrypt");
// simple encryption
var messages = form.querySelectorAll('[name="tana-to-encrypt"]');
if (receiverPublicKey.value != null) {
console.log("simple encryption");
for (var j = 0; j < messages.length; j++) {
var message = messages[j];
var messageValue = message.value;
var encrypted = encrypt(messageValue, localPrivateKey, receiverPublicKey.value);
message.value = JSON.stringify(encrypted);
}
}
// own encryption
var messages = form.querySelectorAll('[name="tana-to-own-encrypt"]');
console.log("own encryption")
for (var r = 0; r < messages.length; r++) {
var message = messages[r];
var messageValue = message.value;
var encrypted = encrypt(messageValue, localPrivateKey, localPublicKey);
message.value = JSON.stringify(encrypted);
}
form.querySelector('[name="tana-encryption-state"]').value = "true";
}
});
}
autoEncryption();
}
function onError(error) {
console.log(`Error: ${error}`);
}
}
autoEncrypt();