dthe_aead_prep_crypt(9)

✨ dthe_aead_prep_crypt(9) ✨

okay so bestie, we're in the Kernel API Manual today and this one is a whole function from dthe_aead_prep_crypt — yes the (9) means it's a kernel function page, iykyk 💅

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🌸 NAME 🌸

dthe_aead_prep_crypt — literally prepares a crypt scatterlist from req->src/req->dst. that's it, that's the vibe 🎀

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🦋 SYNOPSIS 🦋

struct scatterlist * dthe_aead_prep_crypt (struct scatterlist *sg ,
unsigned int assoclen , unsigned int cryptlen , u8 *pad_buf );

she takes four things and hands you back a pointer, no cap ✨

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💖 ARGUMENTS 💖

• sg — your input req->src/req->dst scatterlist. the raw material, the main character 🌈
• assoclen — the length of the AAD (which we skip, bye bestie 👋)
• cryptlen — the length of the ciphertext/plaintext. heads up though: on decryption this is minus the size of the TAG 🏷️
• pad_buf — a zeroed buffer that holds the crypt padding, in case padding is needed 🫶

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👑 DESCRIPTION 👑

so what she actually does: she creates a scatterlist containing only the ciphertext/plaintext portion — AAD gets skipped entirely — with padding to align to AES_BLOCK_SIZE ⭐

it's giving "i only want the good part, and i want it lined up perfectly" 💅

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🔥 RETURN 🔥

you get a pointer to the ciphertext scatterlist. slay. but if something goes wrong you get ERR_PTR(error) instead 😭

⚠️ real talk: the calling function needs to free the returned scatterlist when done. don't just leave her hanging, that's rude fr fr

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🧚 SEE ALSO 🧚

• Kernel file ./drivers/crypto/ti/dthev2-aes.c
• dthe_aead_prep_aad(9)

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💜 that's the whole page bestie, go forth and align your blocks 💜

and for the sign-off — this one comes from the ./drivers/crypto/ti corner of the kernel, dated October 2026 🍓 see you in the next manpage, mwah 🎀✨