cnstr_shdsc_rfc4543_decap(9)

📦 version 7.3.1, in nixpkgs unstable

💅 cnstr_shdsc_rfc4543_decap — bestie, it's a kernel API manual page (section 9, kernel space, no cap)

Okay so listen 👂✨ this one is a function from the Kernel API Manual, and it's called cnstr_shdsc_rfc4543_decap. Say that three times fast, I dare you 😭 It's the IPSec ESP gmac decapsulation shared descriptor constructor — but like, the non-protocol one, so don't come for me about protocols, that's not what this is 🎀

✨ NAME ✨

cnstr_shdsc_rfc4543_decap — builds the shared descriptor for IPSec ESP gmac decapsulation (non-protocol, okay? non-protocol 💅).

🌸 SYNOPSIS 🌸

void cnstr_shdsc_rfc4543_decap (u32 * const desc , struct alginfo *cdata
, unsigned int ivsize , unsigned int icvsize , const bool is_qi );

It returns void, so literally nothing comes back at you, she just does the work and leaves 🫶

🦋 ARGUMENTS 🦋

  • desc — pointer to the buffer you're using for descriptor construction. Like, this is where the descriptor gets built, bestie, hand her the canvas 🎨
  • cdata — pointer to the block cipher transform definitions. Valid algorithm values are OP_ALG_ALGSEL_AES ANDed with OP_ALG_AAI_GCM. That's the vibe check, no other combos allowed, periodt 🔥
  • ivsize — the initialization vector size. Yep, ivsize, that's it, that's the whole thing ✨
  • icvsize — the integrity check value (ICV) size. Can be truncated or full, she's flexible like that 💖
  • is_qi — set to true when it's called from caam/qi. Like, are we in qi mode or are we not, that's the whole question 👑

👑 SEE ALSO 👑

Lowkey the whole friend group shows up here 🫶:

💀 reminder bestie: cdata has to be OP_ALG_ALGSEL_AES ANDed with OP_ALG_AAI_GCM. Anything else and that's not it, fr fr 🙈

Okay that's the whole page, mwah 💋 This gem lives in ./drivers/crypto/caam and the version on deck is dated October 2026 — so yeah, future-coded of her 🌈 slay, go build some descriptors 🧚‍♀️💜

📦 where this page comes from