STRUCT HMAC_SHA1_CTX(9)

💖 struct hmac_sha1_ctx(9) 💖

okay so bestie, this page is from the Kernel API Manual, and it's literally about struct hmac_sha1_ctx — no cap, that's the whole title. It's giving "tiny struct, big crypto energy," and we're gonna walk through every bit without skipping anything. 🎀

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✨ NAME ✨

struct hmac_sha1_ctx - Context for computing HMAC-SHA1 of a message. That's the official one-liner, bestie; short, sweet, and fully iconic. 💅

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🦋 SYNOPSIS 🦋

Here's the struct exactly as the page lays it out — don't touch the punctuation, she's sensitive:

       struct hmac_sha1_ctx {
           struct sha1_ctx sha_ctx;
           struct sha1_block_state ostate;
        };

No extra fields hiding in the group chat. This is the whole definition. ✨

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🫶 Members 🫶

Both members are labeled private in the docs, so this is a strict "look with your eyes, not with your hands" situation. 🙈

• sha_ctx — private. That's the whole note, bestie. No lore, no extra deets, just private.
• ostate — private. Same vibe: private, and that's all the page gives us. periodt. 💀

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🌈 SEE ALSO 🌈

Kernel file: ./include/crypto/sha1.h — that's the spot. The linked crew, in order, is:

• struct sha1_ctx(9)
• sha1_init(9)
• sha1_update(9)
• sha1_final(9)
• sha1(9)
• struct hmac_sha1_key(9)
• hmac_sha1_preparekey(9)
• hmac_sha1_init(9)
• hmac_sha1_init_usingrawkey(9)
• hmac_sha1_update(9)
• hmac_sha1_final(9)
• hmac_sha1(9)
• hmac_sha1_usingrawkey(9)

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okay that's the whole page, bestie — every member, every ref, every crumb. go off and be safe with your HMAC-SHA1 context. 💖

sign-off: source/version ./include/crypto • date October 2026 • page struct hmac_sha1_ctx(9) 🎀