shake_squeeze(9)

💅 shake_squeeze(9) — bestie edition

okay so this is a page from the Kernel API Manual, and today we're learning about shake_squeeze — the function that literally squeezes the juice out of your SHAKE128 or SHAKE256 🍓✨

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✨ NAME ✨

shake_squeeze — Generate output from SHAKE128 or SHAKE256 🫶

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🎀 SYNOPSIS 🎀

void shake_squeeze (struct shake_ctx *ctx , u8 *out , size_t out_len );

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🌸 ARGUMENTS 🌸

• ctx — the context you're about to squeeze. it must have been initialized already, no cap — don't come at this function with a raw uninitialized struct, bestie 😭
• out — where the resulting output data gets written. this is the vibe destination 💫
• out_len — how much data to extract into out, measured in bytes.

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💖 DESCRIPTION 💖

so here's the tea: you can call this multiple times, and that's totally fine, not me being weird about it.

The way it works — a bunch of consecutive squeezes laid end-to-end will yield the exact same output as one big squeeze that generates the same total amount of output. literally identical. it's giving "same energy, different packaging" 👑

⚠️ but listen — more input cannot be provided after squeezing has begun. once you start squeezing, that's it, the input era is over, periodt. 🙈

After the last squeeze, call shake_zeroize_ctx. that's the cleanup step, don't skip it, it's not optional bestie 💅

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🦋 CONTEXT 🦋

Any context. that's it. any. go off ✨

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👑 SEE ALSO 👑

Kernel file ./include/crypto/sha3.h, plus the whole friend group:

• struct sha3_ctx(9)
• sha3_zeroize_ctx(9)
• struct shake_ctx(9)
• shake_zeroize_ctx(9)
• sha3_224_init(9)
• sha3_256_init(9)
• sha3_384_init(9)
• sha3_512_init(9)
• sha3_update(9)
• sha3_final(9)
• shake128_init(9)
• shake256_init(9)
• shake_update(9)
• sha3_224(9)
• sha3_256(9)
• sha3_384(9)
• sha3_512(9)
• shake128(9)
• shake256(9)

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🌈 and that's the whole page! this lil beauty lives in ./include/crypto and the date on it is October 2026 — iconic, timeless, main character energy fr fr. go squeeze something, bestie 🫶🎀