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diff --git a/content/posts/2019-08-25-sha2.md b/content/posts/2019-08-25-sha2.md new file mode 100644 index 0000000..fdeb6d4 --- /dev/null +++ b/content/posts/2019-08-25-sha2.md @@ -0,0 +1,49 @@ +--- +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." + |