STRUCT DTHE_TFM_CTX(9)

💖 NAME

okay so bestie, gather round — struct dthe_tfm_ctx is the transform ctx struct, and it's literally the main character because it holds the ctx for every single sub-component of DTHE V2. one struct to hold them all, iykyk 🫶

✨ SYNOPSIS

here's the whole vibe, verbatim, no cap:

struct dthe_tfm_ctx {
    struct dthe_data *dev_data;
    unsigned int keylen;
    unsigned int authsize;
    u32 key[DTHE_MAX_KEYSIZE / sizeof(u32)];
    enum dthe_aes_mode aes_mode;
    union {
      struct crypto_sync_aead *aead_fb;
      struct crypto_sync_skcipher *skcipher_fb;
    };
 };

🌸 MEMBERS

like, every field explained, and yes we're doing all of them 💅

• dev_data — pointer to the device data struct. that's it, that's the field 🎀
• keylen — the AES key length. how long the key is, fr fr.
• authsize — the authentication size, but only for the modes that actually have authentication. it's giving "conditional queen" ✨
• key — the AES key itself. the whole point, lowkey. 👑
• aes_mode — the AES mode. which mode we're in, bestie.
• {unnamed_union} — an anonymous union. no name, no problem 🙈
• aead_fb — fallback crypto aead handle. it's the backup plan, but make it cryptographic 🦋
• skcipher_fb — fallback crypto skcipher handle for AES-XTS mode specifically. so if you're in AES-XTS, this is your girl 🌈

ngl, the union means aead_fb and skcipher_fb share the same space — one or the other, never both at once. that's the whole point of a union, periodt.

🦋 SEE ALSO

go read these too, bestie, they're all in the kernel file ./drivers/crypto/ti/dthev2-common.h:

• struct dthe_data(9)
• struct dthe_list(9)
• struct dthe_aes_req_ctx(9)
• dthe_copy_sg(9)

and that's the tea ☕ — this lil page lives at ./drivers/crypto/ti, dated October 2026, and it's all about struct dthe_tfm_ctx(9). slay, go forth and transform those crypto requests 💜✨