crypto_aead_ivsize(9)

💅 crypto_aead_ivsize — from the Kernel API Manual, bestie 🎀

okay so before we even start: this page lives in the Kernel API Manual and it is shockingly short, which honestly? iconic behaviour. lowkey a one-job girlie. let's get into it ✨

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🌸 NAME 🌸

crypto_aead_ivsize — obtain IV size 🦋

like. it gets the IV size. that's the whole personality. and we respect it for that.

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⭐ SYNOPSIS ⭐

unsigned int crypto_aead_ivsize (struct crypto_aead *tfm );

no cap, that's it. one function, one argument, returns an unsigned int. main character energy with zero extra drama 💅

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🫶 ARGUMENTS 🫶

• tfm — the cipher handle 💖 like, this is your lil pass to the crypto subsystem, bestie. you hand it over and the function does its thing.

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✨ DESCRIPTION ✨

so here's the tea 🍓: the size of the IV for the aead referenced by the cipher handle gets returned. that's the vibe. that's the whole function.

and listen — this IV size may be zero if the cipher does not need an IV. so if you get a 0 back, don't panic, don't spiral, do not text your ex. it literally just means no IV needed. some ciphers are low-maintenance like that 🙈

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💜 RETURN 💜

IV size in bytes 🔥 plain and simple, she gives you a number, you say thank you.

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👑 SEE ALSO 👑

if you're gonna fall down the AEAD rabbit hole (and tbh you should, it's giving lore), here's the whole reading list, go off 🧚:

• Kernel file ./include/crypto/aead.h
• Authenticated Encryption With Associated Data (AEAD) Cipher API(9)
• struct aead_request(9)
• struct aead_alg(9)
• crypto_alloc_aead(9)
• crypto_free_aead(9)
• crypto_has_aead(9)
• crypto_aead_authsize(9)
• crypto_aead_blocksize(9)
• crypto_aead_setkey(9)
• crypto_aead_setauthsize(9)
• crypto_aead_encrypt(9)
• crypto_aead_decrypt(9)
• Asynchronous AEAD Request Handle(9)
• crypto_aead_reqsize(9)
• aead_request_set_tfm(9)
• aead_request_alloc(9)
• aead_request_free(9)
• aead_request_set_callback(9)
• aead_request_set_crypt(9)
• aead_request_set_ad(9)

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ngl this page is a short read and honestly? slay. sometimes you just need one number and a dream 💀

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and that's the whole page, bestie 🌈 before you close the tab: this beauty ships from ./include/crypto, dated October 2026, and it's filed under crypto_aead_ivsize(9) — periodt 💅✨ take care of her, she's a legend 🎀