cnstr_shdsc_aead_decap(9)

cnstr_shdsc_aead_decap(9) 💅✨

okay so this is the Kernel API Manual page for cnstr_shdsc_aead_decap(9), and it’s literally all about the IPSec ESP decapsulation shared descriptor — the non-protocol one, iykyk 🫶.

✨ NAME ✨

cnstr_shdsc_aead_decap — IPSec ESP decapsulation shared descriptor (non-protocol).

🌸 SYNOPSIS 🌸

void cnstr_shdsc_aead_decap (u32 * const desc , struct alginfo *cdata ,
struct alginfo *adata , unsigned int ivsize , unsigned int icvsize ,
const bool geniv , const bool is_rfc3686 , u32 *nonce , const u32
ctx1_iv_off , const bool is_qi , int era );

💖 ARGUMENTS 💖

• desc — pointer to the buffer used for descriptor construction. This is where the descriptor gets built, bestie.
• cdata — pointer to block cipher transform definitions. Valid algorithm values are one of OP_ALG_ALGSEL_{AES, DES, 3DES} ANDed with OP_ALG_AAI_CBC or OP_ALG_AAI_CTR_MOD128.
• adata — pointer to authentication transform definitions. Heads-up: a split key is required for SEC Era < 6; the size of the split key is specified in this case. Valid algorithm values are one of OP_ALG_ALGSEL_{MD5, SHA1, SHA224, SHA256, SHA384, SHA512} ANDed with OP_ALG_AAI_HMAC_PRECOMP.
• ivsize — initialization vector size.
• icvsize — integrity check value (ICV) size, truncated or full.
• geniv — whether to generate Encrypted Chain IV.
• is_rfc3686 — true when ctr(aes) is wrapped by rfc3686 template.
• nonce — pointer to rfc3686 nonce.
• ctx1_iv_off — IV offset in CONTEXT1 register.
• is_qi — true when called from caam/qi.
• era — SEC Era.

🦋 SEE ALSO 🦋

• Kernel file: ./drivers/crypto/caam/caamalg_desc.c
• cnstr_shdsc_aead_null_encap(9)
• cnstr_shdsc_aead_null_decap(9)
• cnstr_shdsc_aead_encap(9)
• cnstr_shdsc_aead_givencap(9)
• cnstr_shdsc_gcm_encap(9)
• cnstr_shdsc_gcm_decap(9)
• cnstr_shdsc_rfc4106_encap(9)
• cnstr_shdsc_rfc4106_decap(9)
• cnstr_shdsc_rfc4543_encap(9)
• cnstr_shdsc_rfc4543_decap(9)
• cnstr_shdsc_chachapoly(9)
• cnstr_shdsc_skcipher_encap(9)
• cnstr_shdsc_skcipher_decap(9)
• cnstr_shdsc_xts_skcipher_encap(9)
• cnstr_shdsc_xts_skcipher_decap(9)

xoxo, signing off from the source/version line ./drivers/crypto/caam, dated October 2026, for cnstr_shdsc_aead_decap(9) — periodt 💖✨