spu2_ccm_update_iv(9)

💅 spu2_ccm_update_iv(9) — a Kernel API Manual moment

okay so bestie, we're deep in the kernel crypto lore today. this one lives in the Kernel API Manual, and its whole personality is: update the IV as per the requirements for CCM mode. that's it, that's the vibe. short function, very demure, extremely important ✨

---

🌸 NAME

spu2_ccm_update_iv — update the IV as per the requirements for CCM mode. no cap, that's literally the whole job description 🎀

---

✨ SYNOPSIS

void spu2_ccm_update_iv (unsigned int digestsize , struct
spu_cipher_parms *cipher_parms , unsigned int assoclen , unsigned int
chunksize , bool is_encrypt , bool is_esp );

she returns void, she takes six args, she's booked and busy 🫶

---

🦋 ARGUMENTS

okay let's meet the cast, one by one, no skipping 👑

• digestsize — digest size of this request. that's her whole thing, that's the number she ate.
• cipher_parms — a pointer to the cipher parmaeters (their spelling, not mine 💀), and yes it includes the IV buf and the IV len. both. she's thorough.
• assoclen — length of the AAD data. the associated data said "I'm coming too" and we respect it.
• chunksize — length of input data to be sent in this req. this req specifically. not the other req. this one 🍓
• is_encrypt — true if this is an output/encrypt operation. two moods: encrypt or not-encrypt, pick your fighter.
• is_esp — true if this is an ESP / RFC4309 operation. flag it and she'll handle it, iykyk 🌈

---

👑 SEE ALSO

bestie the friend group is LARGE and every single one of them is iconic, so here's the full call sheet — kernel file ./drivers/crypto/bcm/spu2.c plus the entire squad:

• spu2_cipher_xlate(9)
• spu2_hash_xlate(9)
• spu2_fmd_init(9)
• spu2_fmd_ctrl0_write(9)
• spu2_fmd_ctrl1_write(9)
• spu2_fmd_ctrl2_write(9)
• spu2_fmd_ctrl3_write(9)
• spu2_ctx_max_payload(9)
• spu2_payload_length(9)
• spu2_response_hdr_len(9)
• spu2_hash_pad_len(9)
• spu2_gcm_ccm_pad_len(9)
• spu2_assoc_resp_len(9)
• spu2_aead_ivlen(9)
• spu2_hash_type(9)
• spu2_digest_size(9)
• spu2_create_request(9)
• spu2_cipher_req_init(9)
• spu2_cipher_req_finish(9)
• spu2_request_pad(9)
• spu2_xts_tweak_in_payload(9)
• spu2_tx_status_len(9)
• spu2_rx_status_len(9)
• spu2_status_process(9)
• spu2_wordalign_padlen(9)

fr fr, go read them all, they're all serving 🔥

---

🧚 tiny reminder: cipher_parms needs that IV buf and IV len in it, because that's where the whole "update the IV" plot actually happens. main character energy only.

---

and that's the page, bestie 💖 brought to you by ./drivers/crypto/bcm, dated October 2026 — see you in the next (9) bestie, mwah 🎀💅✨