75 lines
2.8 KiB
Markdown
75 lines
2.8 KiB
Markdown
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libemsha
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========
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[](https://travis-ci.org/kisom/libemsha)
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[](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 for
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embedded systems. It is built following the JPL [Power of
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Ten](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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Getting and Building the Source
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-------------------------------
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The source code is available via
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[Github](https://github.com/kisom/libemsha/); each version should be git
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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
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[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]{.title-ref} script
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will bootstrap the project from the autotools sources (e.g. via
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`autoreconf -i`), run `configure` (by default to use clang), and attempt
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to build the library 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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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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- [FIPS 180-4, the Secure Hash
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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
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(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
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Authentication](https://tools.ietf.org/html/rfc2104)
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- [RFC 6234, US Secure Hash Algorithms (SHA and SHA-based HMAC and
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HKDF)](https://tools.ietf.org/html/rfc6234)[^1]
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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
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[crypto/sha256](https://golang.org/src/crypto/sha256/) package.
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**Footnotes**
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[^1]: This library came about after extracting the relevant C code from
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RFC 6234, and needing a C++ version. It draws heavy inspiration from
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that code base.
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