**OpenPGP card client library** This crate implements a client library for the [OpenPGP card](https://gnupg.org/ftp/specs/OpenPGP-smart-card-application-3.4.1.pdf) specification, in Rust. This library provides low level, OpenPGP implementation-agnostic access to OpenPGP cards. Its communication with cards is based on simple data structures that closely match the formats defined in the OpenPGP card specification. **Card access backends** This crate doesn't contain code to talk to cards. Implementations of the traits `CardBackend`/`CardTransaction` need to be provided for access to cards. The crates [openpgp-card-pcsc](https://crates.io/crates/openpgp-card-pcsc) and the experimental crate [openpgp-card-scdc](https://crates.io/crates/openpgp-card-scdc) provide implementations of these traits for use with this crate. **Sequoia PGP wrapper** See the companion crate [openpgp-card-sequoia](https://crates.io/crates/openpgp-card-sequoia) for a high level wrapper to use this library with [Sequoia PGP](https://sequoia-pgp.org/).