HMAC for Game Maker Language

A couple of scripts related to creating a HMAC (hash-based message authentication code).

Wikipedia Explaination: https://en.wikipedia.org/wiki/HMAC.

Marketplace Link: https://marketplace.yoyogames.com/assets/6631/hmac-scripts

Quick start

• Import the scripts you require into your project.
• Call them, they will all follow the structure buffer_hmac_{hashtype}(buffer, offset, size, key)

Requirements

• Game Maker Studio 2 (Untested in GMS1)

Contributing

If you would like to help implement buffer_hmac_sha256 and buffer_hmac_sha512 scripts, I'd happily put them into repository.

A user on the YoYoGames Forums has a HMAC-SHA512 implementation here, however it might require some effort to port it / test it. https://forum.yoyogames.com/index.php?threads/solved-sha512-hmac-script.31253/

Credits

• JujuAdams for their scr_juju_hmac_sha1_no_dependencies(key, string) script to use as an example.
• mimsi for their HMAC SHA512 implementation.
• Gdrooid for their diagram of SHA1-HMAC generation. (Screenshot used for GM Marketplace)