qtkeychain support for storing decrypt password

[eduardomozart]

Is your feature request related to a problem? Please describe.
From what I've seem, Rabbit Remote Control stores password unencrypted on it's entry files by default. The user seems to be able to provide a password/encryption key to decrypt it's stored passwords. The password could be stored on user keychain and retrieved on the fly, this way there's no need to ask the user the password through "Input encryption key" dialog.

It could implement https://github.com/frankosterfeld/qtkeychain which uses the keychain of each OS to safely store the decrypt password which could be used on-the-fly to decrypt the password on the configuration file and, if unable to decrypt (e.g. no key there, aka. moving the $HOME/Documents/Rabbit folder for another computer), the decrypt would fail, then ask the user the password it setup first time on application.

I also created a proof of concept demo that uses Touch ID on macOS, which means that macOS users can simply use it's fingerprint to access connections protected by password: https://github.com/eduardomozart/qtmacbiometric

Describe the solution you'd like
QtKeychain with macOS biometric support.

Describe alternatives you've considered
Royal TSX uses biometrics to decrypt the connection file against unintended access.

Additional context
None.

[KangLin]

Very nice feature. Can you help me with this?
in CParameterOperate class:

    QByteArray PasswordSum(const std::string &password, const std::string &key);
    int LoadPassword(const QString &szTitle, const QString &szKey,
                     QString &password, QSettings &set);
    int SavePassword(const QString &szKey, const QString &password,
                     QSettings &set, bool bSave = false);

RabbitRemoteControl/Src/ParameterOperate.h

Line 249 in 40c1742

QByteArray PasswordSum(const std::string &password, const std::string &key);

RabbitRemoteControl/Src/ParameterOperate.cpp

Line 51 in 40c1742

QByteArray CParameterOperate::PasswordSum(const std::string &password,

[KangLin]

Users can also choose to use password managers such as KeePass to manage passwords.

[eduardomozart]

Yes, integration with other password managers would be great, but a complex feat to achieve. Maybe Rabbit Remote Control could become a "Password Manager" for itself, so the user wouldn't need to use a 3rd party program to store its passwords.

I particularly like the Royal TSX approach, which separates the username/password from the connections themselves. It means I can create a credential object and associate it with connections (e.g., RDP, Web, etc.), so if I use the same password for two different systems, I can simply update the credential object and it updated on both connections at the same time.