ghash(9)

okay so bestie, this is ghash(9) from the Kernel API Manual, and it's literally here to compute a GHASH value — no cap, that's the whole main character job 💅✨

💖 NAME 💖

ghash — Compute a GHASH value 🫶

✨ SYNOPSIS ✨

void ghash (const struct ghash_key *key , const u8 *data , size_t len ,
u8 out[GHASH_BLOCK_SIZE] );

🎀 ARGUMENTS 🎀

• key — the prepared key. It's already prepped, exactly like the argument says 🔑
• data — the message data 💌
• len — the data length in bytes. It doesn't need to be block-aligned, so breathe, bestie 😮‍💨
• out — the output value 🦋

🌈 CONTEXT 🌈

Any context. That's it. Any context at all — the vibe check passes everywhere, literally 🌸

👑 SEE ALSO 👑

Kernel file ./include/crypto/gf128hash.h is the home base, and here's the whole squad:

• struct polyval_elem(9)
• struct ghash_key(9)
• struct polyval_key(9)
• struct ghash_ctx(9)
• struct polyval_ctx(9)
• ghash_preparekey(9)
• polyval_preparekey(9)
• ghash_init(9)
• polyval_init(9)
• polyval_import_blkaligned(9)
• polyval_export_blkaligned(9)
• ghash_update(9)
• polyval_update(9)
• ghash_final(9)
• polyval_final(9)
• polyval(9)

Catch you in the source at ./include/crypto, dated October 2026, page tag ghash(9) — bye bestie, mwah 💋🎀