/**
* Returns decrypted note text if it is encrypted
* The crypto key has to be set in the object
*/
QString Note::getDecryptedNoteText() {
QString noteText = this->noteText;
QString encryptedNoteText = getEncryptedNoteText();
if (encryptedNoteText == "") {
return noteText;
}
// decrypt the note text
BotanWrapper botanWrapper;
botanWrapper.setPassword(cryptoPassword);
botanWrapper.setSalt(BOTAN_SALT);
QString decryptedNoteText = botanWrapper.Decrypt(encryptedNoteText);
// fallback to SimpleCrypt
if (decryptedNoteText == "") {
SimpleCrypt *crypto = new SimpleCrypt(static_cast<quint64>(cryptoKey));
decryptedNoteText = crypto->decryptToString(encryptedNoteText);
}
if (decryptedNoteText == "") {
return noteText;
}
// get regular expression for the encrypted string
QRegularExpression re = getEncryptedNoteTextRegularExpression();
// replace the encrypted text with the decrypted text
noteText.replace(re, decryptedNoteText);
return noteText;
}
/**
* Encrypts the note text with the note's crypto key
*/
QString Note::encryptNoteText() {
// split the text into a string list
QStringList noteTextLines = this->noteText.split(
QRegExp("(\\r\\n)|(\\n\\r)|\\r|\\n"));
// keep the first two lines unencrypted
noteText = noteTextLines.at(0) + "\n" + noteTextLines.at(1) + "\n\n" +
QString(NOTE_TEXT_ENCRYPTION_PRE_STRING) + "\n";
// remove the first two lines for encryption
noteTextLines.removeFirst();
noteTextLines.removeFirst();
// remove the 3rd line too if it is empty
if (noteTextLines.at(0) == "") {
noteTextLines.removeFirst();
}
// join the remaining lines
QString text = noteTextLines.join("\n");
// empty notes will be detected as "can't be decrypted",
// so we will add a space
if (text.isEmpty()) {
text = " ";
}
// encrypt the text
BotanWrapper botanWrapper;
botanWrapper.setPassword(cryptoPassword);
botanWrapper.setSalt(BOTAN_SALT);
QString encryptedText = botanWrapper.Encrypt(text);
// SimpleCrypt *crypto = new SimpleCrypt(static_cast<quint64>(cryptoKey));
// QString encryptedText = crypto->encryptToString(text);
// add the encrypted text to the new note text
noteText += encryptedText + "\n" +
QString(NOTE_TEXT_ENCRYPTION_POST_STRING);
// store note
store();
return noteText;
}
/**
* Checks if note text can be decrypted
*/
bool Note::canDecryptNoteText() {
QString encryptedNoteText = getEncryptedNoteText();
if (encryptedNoteText == "") {
return false;
}
// decrypt the note text
BotanWrapper botanWrapper;
botanWrapper.setPassword(cryptoPassword);
botanWrapper.setSalt(BOTAN_SALT);
QString decryptedNoteText = botanWrapper.Decrypt(encryptedNoteText);
// fallback to SimpleCrypt
if (decryptedNoteText == "") {
SimpleCrypt *crypto = new SimpleCrypt(static_cast<quint64>(cryptoKey));
decryptedNoteText = crypto->decryptToString(encryptedNoteText);
}
return decryptedNoteText != "";
}
