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Self-contained C11 SHA-2 implementation.
Includes implementations of the following:
* SHA-224
* SHA-256
* SHA-384
* SHA-512
* HMAC-SHA-256
* HMAC-SHA-512
See `tests.c` for usage.
Benchmarks
==========
Benchmarks. Partially unrolled compression makes this implementation
faster than [coreutils][], but slower than the [assembly-optimized,
family-specific OpenSSL SHA-2 implementation][openssl-asm-sha].
```
> time -p ./sha256 ~/Videos/8x*avi > /dev/null
rleal 9.39
user 9.10
sys 0.29
> time -p sha256sum ~/Videos/8x*avi > /dev/null
real 12.04
user 11.73
sys 0.31
> time -p openssl sha256 ~/Videos/8x*avi > /dev/null
real 6.36
user 6.01
sys 0.32
```
[sha2]: https://en.wikipedia.org/wiki/SHA-2 "Secure Hash Algorithm 2"
[c11]: https://en.wikipedia.org/wiki/C11_(C_standard_revision) "C11 standard of the C programming language"
[coreutils]: https://www.gnu.org/software/coreutils/ "GNU core utilities"
[openssl-asm-sha]: https://github.com/openssl/openssl/tree/master/crypto/sha/asm "assembly-optimized OpenSSL SHA-2 implementation."
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