spum_aead_ivlen(9)

💅 spum_aead_ivlen(9) — like, the Kernel API Manual era 🎀

okay so bestie, welcome to spum_aead_ivlen, a little function from the Kernel API Manual and honestly? she's lowkey doing the math so you don't have to. no cap. 🧚

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✨ NAME ✨

spum_aead_ivlen — calculates the length of the AEAD IV that goes into a SPU request, right after the AAD and before the payload. that's it, that's the whole vibe check. 💖

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✨ SYNOPSIS ✨

u8 spum_aead_ivlen (enum spu_cipher_mode cipher_mode , u16 iv_len );

copy it exactly like that, bestie, don't get creative with the spacing fr fr 🫶

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✨ ARGUMENTS ✨

• cipher_mode — the cipher mode. yep. that's the whole description. iconic minimalism honestly 💅
• iv_len — the initialization vector length in bytes. give her a number, she'll do something with it ✨

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✨ DESCRIPTION ✨

so here's the tea ☕ — in Linux ~4.2 and later, the assoc_data sg includes the IV. meaning: there's literally no need to include the IV as its own separate field in the SPU request msg. she ate and left no crumbs. 🍓

like, the IV is already in there. she's already at the party. no need to send a second invite. 🎀

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✨ RETURN ✨

the length of the AEAD IV, in bytes. slay. 👑

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✨ SEE ALSO ✨

go look at the kernel file ./drivers/crypto/bcm/spu.c — she's the main character, everything else is the supporting cast 🌈:

• 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_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_ccm_update_iv(9)
• spum_wordalign_padlen(9)

a whole friend group, honestly. iykyk 🦋

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ok that's the whole page, bestie! sources say ./drivers/crypto/bcm, and she was stamped October 2026 — so like, future icon behavior tbh ⭐💜 no cap, go read the other spum_* pages too, they're all in the same group chat 💀✨