ghash_final(9)

🎀 NAME 🎀

Okay bestie, this is ghash_final(9) from the Kernel API Manual, and its whole job is: finish computing a GHASH value. That's it. That's the assignment. 💅✨

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🌸 SYNOPSIS 🌸

void ghash_final (struct ghash_ctx *ctx , u8 out[GHASH_BLOCK_SIZE] );

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🦋 ARGUMENTS 🦋

• ctx — the context you're finalizing, bestie. 🫶
• out — the output value. That's where the final result goes. 💖

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✨ DESCRIPTION ✨

So here's the vibe: if the total data length isn't a multiple of GHASH_BLOCK_SIZE, then the final block is automatically zero-padded. No cap, it just handles that for you. 🧚

After it finishes, this zeroizes ctx. So the caller does not need to do it. Like, don't double-zero, bestie — it's already done. 🙈

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💜 CONTEXT 💜

Any context. Periodt. ✨

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🔥 SEE ALSO 🔥

Kernel file first: ./include/crypto/gf128hash.h — and then these iconic little references:

• 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)
• polyval_final(9)
• ghash(9)
• polyval(9)

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mwah 💋 — this cutie lives in ./include/crypto, dated October 2026. Slay. 🎀💖