hmac_sha256_..._usingrawkey(9)

💅 hmac_sha256_init_usingrawkey — the hmac_sha256_..._usingrawkey(9) glow-up

okay so bestie, this is a page straight out of the Kernel API Manual, and it's literally about setting up an HMAC-SHA256 context when all you've got is a raw key. no prepared-key era, no fancy precomputation — just you, your bytes, and the vibes. let's get into it 🎀

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✨ NAME ✨

hmac_sha256_init_usingrawkey — initialize an HMAC-SHA256 context for a new message, using a raw key 🦋

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🌸 SYNOPSIS 🌸

void hmac_sha256_init_usingrawkey (struct hmac_sha256_ctx *ctx , const
u8 *raw_key , size_t raw_key_len );

that's the whole signature, no cap. void return, so it's giving "i do the thing and you deal with the results" energy. ✨

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🫶 ARGUMENTS 🫶

• ctx — (output) the HMAC context you're initializing. this is where the magic gets written, so hand over a real one, okay? 💖
• raw_key — the raw HMAC-SHA256 key, in its natural state. just the key. nothing done to it. 🧚
• raw_key_len — the key length in bytes. and listen — all key lengths are supported. every single one. nobody's getting turned away at the door. 👑

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💜 DESCRIPTION 💜

the actual description is short and sweet, so here it is in full: if you don't need incremental computation, consider hmac_sha256_usingrawkey instead. that's it, that's the note. lowkey iconic how it just says the one thing and dips 🙈

fr fr though — that's a "consider", not a "you must". if you do need to feed the message in pieces, stay right here. the incremental life chose you.

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🔥 CONTEXT 🔥

Any context. literally any. run it from wherever, whenever. no restrictions, no dress code 💅

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👑 SEE ALSO 👑

okay this list is long long, so buckle up bestie — the whole sha2 and hmac family reunion is here 🌈

Kernel file ./include/crypto/sha2.h, plus:

• 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_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_update(9)
• hmac_sha512_final(9)
• hmac_sha512(9)
• hmac_sha512_usingrawkey(9)

like i said. the whole family. 224, 256, 384, 512, all of them showed up to the party and they all ate 💀✨

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and that's the page! source path is ./include/crypto and the version date on this beauty is October 2026 — so yeah, she's from the future, she's flawless, and she's out. mwah 💋💖🎀