blake2s(9)

💜 blake2s(9) — like, the Kernel API Manual page, bestie 💜

okay so real talk, this is a page from the Kernel API Manual, and it's about blake2s, which computes a BLAKE2s hash in one shot. no multi-step drama, no "call me back later" — you hand it everything at once and it hands you a hash. iconic behavior honestly 🫶

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✨ NAME ✨

blake2s — Compute BLAKE2s hash in one shot. that's it, that's the whole vibe. one call, one hash, done. 💅

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🦋 SYNOPSIS 🦋

void blake2s (const u8 *key , size_t keylen , const u8 *in , size_t
inlen , u8 *out , size_t outlen );

yes there are six arguments. no we're not scared. we're built different. 🔥

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🌸 ARGUMENTS 🌸

okay bestie, let's go through them one by one, no cap, all of them, no skipping:

• key — the key, or NULL for an unkeyed hash. that's right, NULL is valid here, she's allowed to be single 😌
• keylen — the key length in bytes (at most BLAKE2S_KEY_SIZE), or 0 for an unkeyed hash. see? 0 is also valid. she contains multitudes. 💖
• in — the message data. the actual thing you wanna hash. the main character, honestly. 👑
• inlen — the data length in bytes. gotta tell her how much message there is ✨
• out — (output) the resulting BLAKE2s hash, with length outlen. this one's an output parameter, so she gets filled in for you. not you writing to her — her writing to you. slay. 🎀
• outlen — length of output hash value in bytes, at most BLAKE2S_HASH_SIZE. respect the ceiling, bestie, she has limits and they are literally documented 🙈

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🌈 CONTEXT 🌈

Any context. literally any. no restrictions, no prerequisites, no "only from interrupt context" weirdness. free spirit energy. 🦋✨

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💀 SEE ALSO 💀

go read these next, i'm obsessed with a linked list of functions fr fr:

• Kernel file ./include/crypto/blake2s.h
• struct blake2s_ctx(9)
• blake2s_init(9)
• blake2s_init_key(9)
• blake2s_update(9)
• blake2s_final(9)

like... blake2s is the one-shot girlie, but if you want the incremental journey, that whole init → update → final trio is right there waiting for you. iykyk 🌸

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okay that's the whole page, you ate that 💅

this little cutie lives under ./include/crypto and was dated October 2026 — so like, mark your calendars bestie, and remember: one shot, six args, any context. periodt. 💜🎀✨