omac1_aes_128_vector(9)

💅 omac1_aes_128_vector — Kernel API Manual ✨

okay bestie, so this page is omac1_aes_128_vector(9), and it's literally a manual page from the Kernel API Manual — yes, that's the manual name, we're not copying the header line, we're folding it in like a true main character 🎀

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✨ NAME ✨

omac1_aes_128_vector — One-Key CBC MAC (OMAC1) hash with AES-128 🦋

🌸 SYNOPSIS 🌸

int omac1_aes_128_vector (u8 *key , size_t num_elem , u8 *addr[] ,
       size_t *len , u8 *mac );

🎀 ARGUMENTS 🎀

• key — the 128-bit key for the hash operation 🔑 like, the whole secret vibe of this thing
• num_elem — number of elements in the data vector, i.e. how many lil pieces of data you're handing over
• addr — pointers to the data areas 👉👈 yes, plural, it's an array of pointers
• len — the lengths of the data blocks 📏 so it knows how big each one is
• mac — buffer for the MAC (128 bits, i.e., 16 bytes) — this is where the finished MAC gets dropped off 💌

🫶 RETURN 🫶

• 0 on success — slay ✅
• -1 on failure — not slay 😭

💜 DESCRIPTION 💜

So basically this is a mode for using a block cipher (AES in this case, obviously) for authentication. That's the whole gig: auth, not encryption, don't get it twisted 💅

And the lore: OMAC1 was standardized with the name CMAC by NIST in a Special Publication (SP) 800-38B. periodt. That's the tea 🍓

ngl, the exact numbers and spec names matter here — OMAC1, CMAC, NIST, SP, 800-38B — keep them exactly as they are, bestie 🙈

🦋 SEE ALSO 🦋

• Kernel file ./drivers/staging/rtl8723bs/core/rtw_security.c
• omac1_aes_128(9)

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and that's the whole page 🧚 this cutie came from ./drivers/staging/rtl8723bs/core and it's dated October 2026 — go off, October 2026, you iconic little timestamp 👑💖