card-backend 0.2.0

Card backend trait, for use with the openpgp-card crate
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# Backend trait for Smart Card crates

This crate defines the `CardBackend` and `CardTransactions` traits.

The initial target for this abstraction layer was the
[openpgp-card](https://gitlab.com/openpgp-card/openpgp-card) set of client libraries
for OpenPGP card. This trait offers an implementation-agnostic means to access cards.