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---
date: "2019-08-25T07:35:23Z"
title: Self-Contained C11 SHA-2 Implementation
---
Last month I wrote a [C11][] [SHA-2][] implementation.
Features:
* Self-contained (no external dependencies)
* C11 only (platform-agnostic)
* MIT-licensed
* Includes [test vectors][] (via `make test`).
The code is available [here][].
It includes implementations of the following:
* SHA-224
* SHA-256
* SHA-384
* SHA-512
* HMAC-SHA256
* HMAC-SHA512
This implementation is faster than [coreutils][], but slower than the
[assembly-optimized, processor 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
```
[sha-2]: 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."
[here]: https://github.com/pablotron/sha2
"C11 SHA-2 implementation."
[test vectors]: https://www.di-mgt.com.au/sha_testvectors.html
"SHA test vectors."
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