hmac_sha224_preparekey(9)

💅 hmac_sha224_preparekey(9) — like, the kernel API manual, but make it make sense

okay so bestie, welcome to hmac_sha224_preparekey(9) from the Kernel API Manual ✨ this is the little function that gets your key ready for HMAC-SHA224 before you do anything else with it, and honestly? she's short but she's important 🎀

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✨ NAME ✨

hmac_sha224_preparekey — get a key all set up and ready for HMAC-SHA224 💖

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🦋 SYNOPSIS 🦋

void hmac_sha224_preparekey (struct hmac_sha224_key *key , const u8
*raw_key , size_t raw_key_len );

like, that's the whole call signature, no notes 💅

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🌸 ARGUMENTS 🌸

• key — (output) the key structure you're initializing. she gets filled in by this function, so don't come in with expectations 🫶
• raw_key — the raw HMAC-SHA224 key, your actual secret material 🔥
• raw_key_len — the key length in bytes. and listen: all key lengths are supported. yes, all of them. every single one. no gatekeeping here 👑

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🎀 NOTE 🎀

bestie. bestie listen to me. the caller is responsible for zeroizing both the struct hmac_sha224_key and the raw key once they are no longer needed. 😭 that's on you, not the function. wipe your secrets, don't just leave them lying around, that's not the vibe 🙈

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⭐ CONTEXT ⭐

Any context. literally any. she doesn't care, she's flexible like that 💜

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🧚 SEE ALSO 🧚

like, the whole friend group 💖

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

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and that's the page!! 🫶 this lil beauty lives in ./include/crypto (that's the source, mwah 💋), dated October 2026, and it's the hmac_sha224_preparekey(9) page — go forth and prepare your keys, but zeroize them after, i'm serious 😤💖