A soft key (in-memory key) backend for Sequoia's private key store.
The sequoia-keystore crate implements a server that manages secret
key material. Secret key material can be stored in files, on hardware
devices like smartcards, or accessed via the network.
sequoia-keystore doesn't implement these access methods. This is
taken care of by various backends.
This crate includes a backend that provides access to secret key material stored in files. These are called soft keys in contrast to keys managed by a separate piece of hardware.
If the keystore is configured to use .local/share/sequoia as its
data directory, then the soft key backend uses
.local/share/sequoia/keystore/softkeys. Specifically, it iterates
over the files in that directory, and looks for binary encoded or
ASCII-armor encoded OpenPGP certificates in files ending with .pgp
or .asc; other files are silently ignored.
$ ls .local/share/sequoia/keystore/softkeys/
1234.pgp 1234.pgp.rev alice.pgp alice.pgp.rev F44B66C85C9B7B02AF2D52FDEFF613897AD9CE21.pgp