constant Hash (checking for equality in C/adm?

[lulcat]

Hi. I use the C code mixed with other great language for performance. HOwever, I am looking to use hmac/kmac (and wondering if the blake3_keyed IS in fact the same construct as keccak mac?). As there is the , for fixed length keys, H(k|| m) but also this H_k(m) , right?

But anyway, alsol the main lib implementation in Rust had struct Hash which says one should absolutely use such an impleentaiton for checking macs, and not memcmp or memory iteraiton of some form or other.. due to constant time security requirements.

Why is this not in the C API? DO you intend to add it or is this something we have to do then? (Including I guess some of the related API stuff)

Regards,

M.