aes_cmac_final(9)

💅 aes_cmac_final(9) — or, the Kernel API Manual's lil' grand finale 🎀

okay so bestie, welcome to aes_cmac_final(9) from the Kernel API Manual — the moment where you finally wrap up that AES-CMAC or AES-XCBC-MAC and get your pretty lil' MAC value out. ✨

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🌸 NAME 🌸

aes_cmac_final — finish computing an AES-CMAC or AES-XCBC-MAC value 🦋

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✨ SYNOPSIS ✨

void aes_cmac_final (struct aes_cmac_ctx *ctx , u8 out[static AES_BLOCK_SIZE] );

like, that's the whole vibe. one call, and you're done. 💅

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🎀 ARGUMENTS 🎀

• ctx — the context you're finalizing; it must have been initialized already, no cap. if you skipped init, that's not it, bestie. 😭
• out — (output) the resulting MAC. this is where your hard-earned MAC lands, and honestly? she earned it. 👑

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🫶 DESCRIPTION 🫶

so you've done all your updates, and now it's time to close it out. after finishing, this zeroizes ctx — like, scrubs it clean automatically, no notes. 🔥

the way that means the caller does not need to do it — you don't have to manually zeroize anything, the function handles it for you. periodt. 💅

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🌈 CONTEXT 🌈

any context. literally any. she's flexible like that. 🧚

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⭐ SEE ALSO ⭐

go give these icons some love, iykyk:

• Kernel file ./include/crypto/aes-cbc-macs.h
• struct aes_cmac_key(9)
• aes_cmac_zeroize_key(9)
• struct aes_cmac_ctx(9)
• aes_cmac_zeroize_ctx(9)
• aes_cmac_preparekey(9)
• aes_xcbcmac_preparekey(9)
• aes_cmac_init(9)
• aes_cmac_update(9)
• aes_cmac(9)

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okay and one last lil' sign-off bestie 🫶 — this whole page is living under ./include/crypto, dated October 2026, and it's aes_cmac_final(9) in the Kernel API Manual. slay, secure, and done. 💖 ✨ 🎀