STRUCT ALGO_DATA(9)

✨ struct algo_data(9) ✨

okay so bestie, welcome to the Kernel API Manual 💖 this is the page for struct algo_data — literally the little data bundle that holds all the crypto-algorithm-specific stuff. it's giving "backstage pass to the crypto engine" energy and i'm obsessed 🎀

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🌸 NAME 🌸

struct algo_data — Crypto algorithm specific data 🦋

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💅 SYNOPSIS 💅

struct algo_data {
    struct sa_eng_info enc_eng;
    struct sa_eng_info auth_eng;
    u8 auth_ctrl;
    u8 hash_size;
    u8 iv_idx;
    u8 iv_out_size;
    u8 ealg_id;
    u8 aalg_id;
    u8 *mci_enc;
    u8 *mci_dec;
    bool inv_key;
    struct sa_tfm_ctx *ctx;
    bool keyed_mac;
    void (*prep_iopad)(struct algo_data *algo, const u8 *key, u16
key_sz, __be32 *ipad, __be32 *opad);
 };

look at her. a whole struct. main character energy fr fr 👑

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🧚 Members 🧚

okay now the member-by-member vibe check, no cap, every single one:

• enc_eng — the Encryption engine info structure. she's the one holding the tea about the encryption side 💫
• auth_eng — the Authentication engine info structure. same energy, but for auth 🫶
• auth_ctrl — Authentication control word. short, sweet, in charge.
• hash_size — Size of digest. like, how big the hash is gonna be 🍓
• iv_idx — iv index in psdata. yes, exactly where it says.
• iv_out_size — iv out size. that's it. that's the whole vibe.
• ealg_id — Encryption Algorithm ID 🔥
• aalg_id — Authentication algorithm ID 🔥
• mci_enc — Mode Control Instruction for Encryption algorithm. iconic little instruction pointer 💅
• mci_dec — Mode Control Instruction for Decryption. her twin, equally iconic.
• inv_key — Whether the encryption algorithm demands key inversion. lowkey important 👀
• ctx — Pointer to the algorithm context. she's pointing at the context, literally.
• keyed_mac — Whether the authentication algorithm has key. yup, that's the whole thing.
• prep_iopad — Function pointer to generate intermediate ipad/opad ⭐ (yes bestie, a function pointer, she's fancy like that)

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👑 SEE ALSO 👑

go check these out next, i'm literally begging you 🙈:

• Kernel file ./drivers/crypto/sa2ul.c
• struct sa_cmdl_cfg(9)
• struct sa_alg_tmpl(9)
• struct sa_mapped_sg(9)
• struct sa_rx_data(9)
• struct sa_req(9)

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ngl bestie, if you made it this far you're officially a kernel crypto girlie now 💀💖 go forth and read those structs.

and that's the page!! mwah 🫶 this one lives under ./drivers/crypto and it's dated October 2026 — slay, periodt, see you in the source tree 🌈✨