hmac_sha512_update(9)

💜 hmac_sha512_update — like, the glow-up phase of your HMAC-SHA512

okay so this is hmac_sha512_update(9) from the Kernel API Manual — yes, section 9, we're in kernel-land bestie, put your big-girl hat on 🎀

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✨ NAME ✨

hmac_sha512_update — the function that feeds more message data into your HMAC-SHA512 context. it's giving "keep the vibe going" energy, no cap 💅

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🌸 SYNOPSIS 🌸

void hmac_sha512_update (struct hmac_sha512_ctx *ctx , const u8 *data ,
size_t data_len );

look at her. three params, returns void, zero drama. she does her job and doesn't need to tell you about it 🫶

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🦋 ARGUMENTS 🦋

• ctx — the HMAC context you're updating. ⚠️ heads up: it must have been initialized already. like, do not show up to this function with an uninitialized context, that's not the move, that's main character energy in the worst way 😭
• data — the message data itself. the actual content. the material. ✨
• data_len — how long that data is, and we're counting in bytes bestie, always bytes 🍓

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🌈 DESCRIPTION 🌈

okay so the whole entire vibe here is: this can be called any number of times. that's it. that's the tea ☕ literally as many times as you want, keep calling her, she's not tired, she's thriving 💖

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⭐ CONTEXT ⭐

Any context. any. all of them. she's flexible like that, we stan an adaptable icon 👑

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👑 SEE ALSO 👑

kernel file ./include/crypto/sha2.h — and then a whole friend group, honestly, they all showed up to the function party:

struct sha224_ctx(9), sha224_init(9), sha224_update(9), sha224_final(9),
sha224(9), struct hmac_sha224_key(9), struct hmac_sha224_ctx(9),
hmac_sha224_preparekey(9), hmac_sha224_init(9),
hmac_sha224_init_usingrawkey(9), hmac_sha224_update(9),
hmac_sha224_final(9), hmac_sha224(9), hmac_sha224_usingrawkey(9), struct
sha256_ctx(9), sha256_init(9), sha256_update(9), sha256_final(9),
sha256(9), sha256_finup_2x(9), sha256_finup_2x_is_optimized(9), struct
hmac_sha256_key(9), struct hmac_sha256_ctx(9),
hmac_sha256_preparekey(9), hmac_sha256_init(9),
hmac_sha256_init_usingrawkey(9), hmac_sha256_update(9),
hmac_sha256_final(9), hmac_sha256(9), hmac_sha256_usingrawkey(9), struct
sha384_ctx(9), sha384_init(9), sha384_update(9), sha384_final(9),
sha384(9), struct hmac_sha384_key(9), struct hmac_sha384_ctx(9),
hmac_sha384_preparekey(9), hmac_sha384_init(9),
hmac_sha384_init_usingrawkey(9), hmac_sha384_update(9),
hmac_sha384_final(9), hmac_sha384(9), hmac_sha384_usingrawkey(9), struct
sha512_ctx(9), sha512_init(9), sha512_update(9), sha512_final(9),
sha512(9), struct hmac_sha512_key(9), struct hmac_sha512_ctx(9),
hmac_sha512_preparekey(9), hmac_sha512_init(9),
hmac_sha512_init_usingrawkey(9), hmac_sha512_final(9), hmac_sha512(9),
hmac_sha512_usingrawkey(9)

like I said. a whole friend group. 💀 but they're all icons, go read them, iykyk 🔥

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okay bye bestie, this page lives in ./include/crypto and it's dated October 2026 — so go forth, call hmac_sha512_update as many times as your little heart desires, and slay 💅✨🎀