aes_ccm_decrypt_final(9)

💅 aes_ccm_decrypt_final — like, the grand finale of AES-CCM decryption

okay bestie, welcome to the aes_ccm_decrypt_final page — it's from the Kernel API Manual, section 9, and yeah, it's giving "last step of a very serious crypto ritual" energy. 🎀

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✨ SYNOPSIS ✨

int aes_ccm_decrypt_final (struct aes_ccm_ctx *ctx , const u8 *authtag
);

that's the whole signature, no cap — it takes two things and hands you back an int. 🫶

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🌸 ARGUMENTS 🌸

• ctx — an AES-CCM context. like, the little workspace where all the crypto state has been chilling this whole time. 🧚
• authtag — the stored authentication tag. and bestie, its length is exactly the authtag_len that was passed to aes_ccm_preparekey — don't go freestyling a different size, iykyk. 🔥

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💖 DESCRIPTION 💖

This is the wrap-up call. the finishing move. the "okay we're done here" moment. ✨

and here's the cute part: it also zeroizes ctx, so the caller doesn't need to do it. that's right, it cleans up after itself — main character energy who also does her own dishes. 💅

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🦋 CONTEXT 🦋

Any context. literally any. no restrictions, no dress code, go off. 🌈

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⭐ RETURN ⭐

• 0 on success. 🎉 and listen — this is the only case where any decrypted or associated data can be used. like, only only. no exceptions, periodt.
• -EBADMSG if the message is inauthentic 💀 — which means somebody's been messing with your data and you should absolutely not trust it.

fr fr: if you don't get 0 back, do not touch the decrypted data. that's the whole vibe check of this function.

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👑 SEE ALSO 👑

Kernel file ./include/crypto/aes-ccm.h, plus the whole squad:

• struct aes_ccm_key(9)
• struct aes_ccm_ctx(9)
• aes_ccm_preparekey(9)
• aes_ccm_encrypt(9)
• aes_ccm_decrypt(9)
• aes_ccm_init(9)
• aes_ccm_auth_update(9)
• aes_ccm_encrypt_update(9)
• aes_ccm_decrypt_update(9)
• aes_ccm_encrypt_final(9)

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and that's the page, bestie 🍓 — brought to you by the fine folks over at ./include/crypto, dated October 2026. mwah, go decrypt something responsibly 💜✨