Add nitrokey as a dependency to nitrocli

The nitrokey crate provides a simple interface to the Nitrokey Storage
and the Nitrokey Pro based on the libnitrokey library developed by
Nitrokey UG.  The low-level bindings to this library are available in
the nitrokey-sys crate.

This patch adds version v0.2.1 of the nitrokey crate as a dependency
for nitrocli.  It includes the indirect dependencies nitrokey-sys
(version 3.4.1) and rand (version 0.4.3).

Import subrepo nitrokey/:nitrokey at 2eccc96ceec2282b868891befe9cda7f941fbe7b
Import subrepo nitrokey-sys/:nitrokey-sys at f1a11ebf72610fb9cf80ac7f9f147b4ba1a5336f
Import subrepo rand/:rand at d7d5da49daf7ceb3e5940072940d495cced3a1b3

1 files changed, 84 insertions, 0 deletions

diff --git a/nitrokey/README.md b/nitrokey/README.md
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+# nitrokey-rs
+
+A libnitrokey wrapper for Rust providing access to Nitrokey devices.
+
+[Documentation][]
+
+```toml
+[dependencies]
+nitrokey = "0.2.1"
+```
+
+## Compatibility
+
+The required [`libnitrokey`][] version is built from source.  The host system
+must provide `libhidapi-libusb0` in the default library search path.
+
+Currently, this crate provides access to the common features of the Nitrokey
+Pro and the Nitrokey Storage:  general configuration, OTP generation and the
+password safe.  Basic support for the secure storage on the Nitrokey Storage is
+available but still under development.
+
+### Unsupported Functions
+
+The following functions provided by `libnitrokey` are deliberately not
+supported by `nitrokey-rs`:
+
+- `NK_get_time()`.  This method is useless as it will always cause a timestamp
+  error on the device (see [pull request #114][] for `libnitrokey` for details).
+- `NK_get_status()`.  This method only provides a string representation of
+  data that can be accessed by other methods (firmware version, serial number,
+  configuration).
+- `NK_get_status_storage_as_string()`.  This method only provides an incomplete
+  string representation of the data returned by `NK_get_status_storage`.
+
+## Tests
+
+This crate has three test suites that can be selected using features.  One test
+suite (feature `test-no-device`) assumes that no Nitrokey device is connected.
+The two other test suites require a Nitrokey Pro (feature `test-pro`) or a
+Nitrokey Storage (feature `test-storage`) to be connected.
+
+Use the `--features` option for Cargo to select one of the test suites.  You
+cannot select more than one of the test suites at the same time.  Note that the
+test suites that require a Nitrokey device assume that the device’s passwords
+are the factory defaults (admin password `12345678` and user password
+`123456`).  Running the test suite with a device with different passwords might
+lock your device!  Also note that the test suite might delete or overwrite data
+on all connected devices.
+
+As the tests currently are not synchronized, you have to make sure that they
+are not executed in parallel.  To do so, pass the option `--test-threads 1` to
+the test executable.
+
+In conclusion, you can use these commands to run the test suites:
+
+```
+$ cargo test --features test-no-device -- --test-threads 1
+$ cargo test --features test-pro -- --test-threads 1
+$ cargo test --features test-storage -- --test-threads 1
+```
+
+The `totp_no_pin` and `totp_pin` tests can occasionally fail due to bad timing.
+
+## Acknowledgments
+
+Thanks to Nitrokey UG for providing a Nitrokey Storage to support the
+development of this crate.
+
+## Contact
+
+For bug reports, patches, feature requests or other messages, please send a
+mail to [nitrokey-rs-dev@ireas.org][].
+
+## License
+
+This project is licensed under the [MIT License][].  `libnitrokey` is licensed
+under the [LGPL-3.0][].
+
+[Documentation]: https://docs.rs/nitrokey
+[`libnitrokey`]: https://github.com/nitrokey/libnitrokey
+[nitrokey-rs-dev@ireas.org]: mailto:nitrokey-rs-dev@ireas.org
+[pull request #114]: https://github.com/Nitrokey/libnitrokey/pull/114
+[MIT license]: https://opensource.org/licenses/MIT
+[LGPL-3.0]: https://opensource.org/licenses/lgpl-3.0.html