hmac_sha256_init(9)

🎀 NAME 🎀

okay bestie, meet hmac_sha256_init(9), straight out of the Kernel API Manual ✨ its whole NAME-section job is initializing an HMAC-SHA256 context for a new message. that's the serve, no cap 💅

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✨ SYNOPSIS ✨

the signature, untouched, because we do not play with code in this group chat:

       void hmac_sha256_init (struct hmac_sha256_ctx *ctx , const struct
       hmac_sha256_key *key );

💖 ARGUMENTS 💖

two arguments, both iconic:

• ctx — (output) the HMAC context to initialize. yes, it's giving output energy 🫶
• key — the prepared HMAC key. already prepped, ready to slay 🔑

🌸 DESCRIPTION 🌸

the entire description is a soft lil' redirect:

If you don't need incremental computation, consider hmac_sha256 instead. that's it. that's the note. 🍓

🦋 CONTEXT 🦋

literally Any context. that's the whole vibe. no special context era, just any context, periodt 😌✨

🔥 SEE ALSO 🔥

okay this list is long and we are respecting every single reference, because skipping refs is not the move:

• 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(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_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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this page is literally hmac_sha256_init(9), brought to you by source/version ./include/crypto, dated October 2026 💖✨🫶