This patch implements a new database wizard to guide users through the process
of setting up a new database and choosing sane encryption settings.
It also reimplements the master key settings to be more
user-friendly. Users can now add, change, or remove individual composite
key components instead of having to set all components at once. This
avoids confusion about a password being reset if the user only wants to
add a key file.
With these changes comes a major refactor of how database composite keys and key
components are handled. Copying of keys is prohibited and each key
exists only once in memory and is referenced via shared pointers. GUI
components for changing individual keys are encapsulated into separate
classes to be more reusable. The password edit and generator widgets
have also been refactored to be more reusable.
The previous default was to expect passphrases to be ASCII or
rather Latin-1. It would be reasonable to expect modern keys to
use UTF-8 instead.
This is a non-breaking change if passphrases only use characters
that fall within ASCII.
Fixes#2102
AES-256 uses a 32-byte (256-bit) key size. This un-breaks the loader and
tests added for AES-256-CBC and AES-256-CTR PEM keys.
* OpenSSHKey: correctly parse encrypted PEM AES-256-CBC/AES-256-CTR keys
* OpenSSHKey: use correct key derivation for AES-256
