79 lines
2.9 KiB
ReStructuredText
79 lines
2.9 KiB
ReStructuredText
libemsha
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========
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.. image:: https://travis-ci.org/kisom/libemsha.svg?branch=master
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:target: https://travis-ci.org/kisom/libemsha
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.. image:: https://scan.coverity.com/projects/7318/badge.svg
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:target: https://scan.coverity.com/projects/libemsha-52f2a5fd-e759-43c2-9073-cf6c2ed9abdb
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This library is an MIT-licensed HMAC-SHA-256 C++11 library designed
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for embedded systems. It is built following the JPL `Power of Ten
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<http://spinroot.com/gerard/pdf/P10.pdf>`_ rules. It was written in
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response to a need for a standalone HMAC-SHA-256 package that could run
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on several platforms.
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-------------------------------
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Getting and Building the Source
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-------------------------------
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The source code is available via `Github
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<https://github.com/kisom/libemsha/>`_; each version should be git tagged. ::
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git clone https://github.com/kisom/libemsha
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git clone git@github.com:kisom/libemsha
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The current release is `1.0.1 <https://github.com/kisom/libemsha/releases/tag/v1.0.1>`_.
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The project is built using Autotools and ``make``.
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When building from a git checkout, the `autobuild` script will bootstrap
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the project from the autotools sources (e.g. via ``autoreconf -i``),
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run ``configure`` (by default to use clang), and attempt to build the library
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and run the unit tests.
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Once the autotools infrastructure has been bootstrapped, the following
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should work: ::
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./configure && make && make check && make install
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There are three flags to ``configure`` that might be useful:
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+ ``--disable-hexstring`` disables the provided ``hexstring`` function;
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while this might be useful in many cases, it also adds extra size to
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the code.
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+ ``--disable-hexlut`` disables the larger lookup table used by
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``hexstring``, which can save around a kilobyte of program space. If
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the ``hexstring`` function is disabled, this option has no effect.
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+ ``--disable-selftest`` disables the internal self-tests, which can
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reclaim some additional program space.
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-------------
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Documentation
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-------------
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Documentation is currently done with `Sphinx <http://sphinx-doc.org/>`_.
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See ``doc/``.
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See also
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--------
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* `FIPS 180-4, the Secure Hash Standard <http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.180-4.pdf>`_
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* `FIPS 198-1, The Keyed-Hash Message Authentication Code (HMAC) <http://csrc.nist.gov/publications/fips/fips198-1/FIPS-198-1_final.pdf>`_
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* `RFC 2014, HMAC: Keyed-Hashing for Message Authentication <https://tools.ietf.org/html/rfc2104>`_
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* `RFC 6234, US Secure Hash Algorithms (SHA and SHA-based HMAC and HKDF) <https://tools.ietf.org/html/rfc6234>`_\ [#f1]_
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* The behaviour of this package was cross-checked using the Go 1.5.1
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linux/amd64 standard library's `crypto/sha256 <https://golang.org/src/crypto/sha256/>`_
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package.
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.. rubric:: Footnotes
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.. [#f1] This library came about after extracting the relevant C code
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from RFC 6234, and needing a C++ version. It draws heavy
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inspiration from that code base.
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