hmac_sha512_..._usingrawkey(9)

💅 hmac_sha512_init_usingrawkey — the Kernel API Manual, bestie edition ✨

okay so real talk, this is a page from the Kernel API Manual (yes the whole manual, we're fancy like that 🎀), and it's about one very specific little function that kicks off an HMAC-SHA512 thing. stay with me, it's actually cute.

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🌸 NAME 🌸

hmac_sha512_init_usingrawkey — literally initialize an HMAC-SHA512 context for a brand new message, and you're doing it with a raw key. that's the whole vibe. ✨

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🦋 SYNOPSIS 🦋

void hmac_sha512_init_usingrawkey (struct hmac_sha512_ctx *ctx , const
u8 *raw_key , size_t raw_key_len );

no return value, it's a void girlie — she just does the thing and dips 💅

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🎀 ARGUMENTS 🎀

• ctx — (output) the HMAC context you're initializing. this is the main character, she gets filled in 🫶
• raw_key — the raw HMAC-SHA512 key itself. the actual key. no packaging, no nothing, just raw ✨
• raw_key_len — the key length in bytes. and like, all key lengths are supported. every single one. no cap 🔥

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💖 DESCRIPTION 💖

so here's the tea: this is the incremental path. if you don't need incremental computation though, bestie, consider hmac_sha512_usingrawkey instead — it's the one-shot version and honestly it's giving convenience 👑

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🌈 CONTEXT 🌈

Any context. that's it. any. we don't gatekeep here 🦋

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⭐ SEE ALSO ⭐

the whole crypto friend group showed up, and yes i'm listing every single one of them because they all deserve their moment 💜

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

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that's the whole page babes 🫶 — and for the receipts: this one lives under ./include/crypto, dated October 2026, filed under hmac_sha512_..._usingrawkey(9). slay, go hash something 💅✨