hmac_sha224(9)

💖 hmac_sha224(9) — one-shot HMAC-SHA224, bestie edition 💖

okay so this is a page from the Kernel API Manual, and it's about hmac_sha224 ✨ she computes an HMAC-SHA224 for you in literally one shot, using a key you already prepared. one and done, no cap 🎀

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🌸 SYNOPSIS 🌸

void hmac_sha224 (const struct hmac_sha224_key *key , const u8 *data ,
size_t data_len , u8 out[static SHA224_DIGEST_SIZE] );

that's the whole vibe check right there 👑

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🦋 ARGUMENTS 🦋

• key — the prepared HMAC key 💅 like, already prepped, already iconic, don't come at her with a raw key, she's not doing that today
• data — the message data, aka the actual tea you're hashing ☕
• data_len — how long data is, in bytes. yes, in bytes, keep up bestie 📏
• out — (output) the resulting HMAC-SHA224 value drops in here 🫶 the finished product, the slay, the moment

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✨ DESCRIPTION ✨

so basically: if you're only using the key once, you should lowkey consider hmac_sha224_usingrawkey instead 👀 that's the whole note. fr fr, that's it, she's not gonna overexplain.

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🌈 CONTEXT 🌈

Any context. literally any. she does not care. she's flexible like that 🧚 run her wherever, whenever, she ate 💅

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💜 SEE ALSO 💜

okay so the friend group is HUGE, buckle up bestie 😭 this is the whole extended universe:

• Kernel file ./include/crypto/sha2.h
• 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_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_update(9), hmac_sha512_final(9), hmac_sha512(9), hmac_sha512_usingrawkey(9)

like I said. the whole friend group. every single one of them 💀 but they're all parallel implementations, so think of it as a family portrait 🖼️

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ngl the source lives at ./include/crypto and the date on this one is October 2026 — so yeah, she's from the future, main character energy fr fr 👑💫 hope this helped bestie, go forth and hash responsibly 🫶💖