spum_ccm_update_iv(9)

✨ spum_ccm_update_iv ✨ (section 9, Kernel API Manual, bestie)

Okay so picture this: you're deep in the kernel, you're doing CCM mode, and the IV needs a little glow-up. That's literally this function. spum_ccm_update_iv — Update the IV as per the requirements for CCM mode. That's the whole vibe. No cap. 💅

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🌸 SYNOPSIS 🌸

void spum_ccm_update_iv (unsigned int digestsize , struct
spu_cipher_parms *cipher_parms , unsigned int assoclen , unsigned int
chunksize , bool is_encrypt , bool is_esp );

It returns void, so don't go looking for a return value, she gives you nothing and she's iconic for it. 🎀

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🦋 ARGUMENTS 🦋

Six args, all of them main character energy:

• digestsize — the digest size of this request. That's it, that's the whole lore.
• cipher_parms — a pointer to the cipher parameters, and yes bestie this is the important one: it includes the IV buf and the IV len. The IV lives here. Be normal about it.
• assoclen — length of the AAD data. (Additional Authenticated Data, iykyk.)
• chunksize — length of the input data that's getting sent in this req. Just this req. Don't overthink it. 🫶
• is_encrypt — true if this is an output/encrypt operation. So flip it and it's not, you get it.
• is_esp — true if this is an ESP / RFC4309 operation. ✨ Very demure, very RFC4309.

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👑 SEE ALSO 👑

Kernel file ./drivers/crypto/bcm/spu.c — go read her, she's the source of truth, and also literally all of her friends:

• spum_ns2_ctx_max_payload(9)
• spum_nsp_ctx_max_payload(9)
• spum_response_hdr_len(9)
• spum_hash_pad_len(9)
• spum_gcm_ccm_pad_len(9)
• spum_assoc_resp_len(9)
• spum_aead_ivlen(9)
• spum_hash_type(9)
• spum_digest_size(9)
• spum_create_request(9)
• spum_cipher_req_init(9)
• spum_cipher_req_finish(9)
• spum_request_pad(9)
• spum_xts_tweak_in_payload(9)
• spum_tx_status_len(9)
• spum_rx_status_len(9)
• spum_status_process(9)
• spum_wordalign_padlen(9)

That's the whole group chat. Go say hi. 💖

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Lowkey a reminder: those all end in (9) because they're kernel API manual pages, so if you're searching for them, use man 9 <name>. 🧚

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And that's the page!! 🌈 Coming at you from ./drivers/crypto/bcm, dated October 2026, and yes the page is still called spum_ccm_update_iv(9) — she's booked and busy. Mwah. 💜🍓