KCAPI_MD_UPDATE(3)

💖 KCAPI_MD_UPDATE 💖

okay bestie, welcome to the kcapi_md_update(3) page, from the libkcapi programming interface, and it's giving streaming message digest energy ✨ it's literally the "keep adding more data to my digest" function, and honestly? obsessed.

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🌸 NAME 🌸

kcapi_md_update — the message digest update function, but make it a stream 💅

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✨ SYNOPSIS ✨

ssize_t kcapi_md_update(struct kcapi_handle * handle,
                        const uint8_t * buffer, size_t len);

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🎀 ARGUMENTS 🎀

• handle — [in] the cipher handle, aka the lil passport your digest is travelling with 🛂
• buffer — [in] this one's holding the data to add to the message digest 📥 like, it's the snack you're feeding your digest
• len — [in] the buffer length, aka how much snack, exactly 🍓

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🦋 DESCRIPTION 🦋

so here's the tea: your input buffer can be at most INT_MAX in size. that's the ceiling, no cap, do not try to exceed it 🙈

and the vibe check on the return? it returns 0 upon success, and if something went wrong it hits you with a negative errno-style error code 💀 so like, negative numbers = not slaying, positive-ish zero = slaying, periodt.

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👑 AUTHOR 👑

Stephan Mueller <smueller@chronox.de> — the author, the icon, the main character of this page 🫶

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💜 COPYRIGHT 💜

libkcapi Manual 1.5.0 — July 2025

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and that's the whole page bestie, go forth and stream your digests responsibly 💖✨🎀