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Update high level documentation on backends

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Heiko Schaefer 2022-03-23 12:10:38 +01:00
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README.md
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@ -65,6 +65,7 @@ implementation.
Typically, `openpgp-card` will be used with the `openpgp-card-pcsc` backend,
which uses the standard pcsclite library to communicate with cards.
However, alternative backends can be used and may be useful.
The experimental, alternative `openpgp-card-scdc` backend uses scdaemon from
the GnuPG project as a low-level transport layer to interact with OpenPGP
@ -73,9 +74,11 @@ cards.
Backends implement:
1) functionality to find and connect to a card (these operations may vary
significantly between different backends), and
significantly between different backends),
2) a very simple communication primitive, by implementing the `CardClient`
2) transaction management (where applicable), by implementing the `CardBackend` trait, and
3) simple communication primitives, by implementing the `CardTransaction`
trait, to send individual APDU commands and receive responses.
All higher level and/or OpenPGP card-specific logic (including command