crypto_lskcipher_setkey(9)

💅 crypto_lskcipher_setkey(9) — like, the kernel API manual page, bestie ✨

Okay so this is a page from the Kernel API Manual, and the function we're talking about is crypto_lskcipher_setkey — yes the (9) is part of the name, that's just how kernel docs do 🎀

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✨ NAME ✨

crypto_lskcipher_setkey — set the key for a cipher, that's the whole vibe 🔑

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🌸 SYNOPSIS 🌸

int crypto_lskcipher_setkey (struct crypto_lskcipher *tfm , const u8
*key , unsigned int keylen );

Like, it returns an int, bestie, and you hand it three things — periodt 💅

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🦋 ARGUMENTS 🦋

• tfm — the cipher handle, your main character 🫶
• key — the buffer holding the key, no cap 🔑
• keylen — length of the key, in bytes (yes, bytes, don't come at me with bits 💀)

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👑 DESCRIPTION 👑

So the caller-provided key gets set for the lskcipher that's referenced by the cipher handle. That's it. That's the whole thing ✨

But wait — important lore: the key length literally determines the cipher type. It's giving "your key's size is its whole personality" ngl. Many block ciphers implement different cipher modes depending on the key size — iconic examples being AES-128 vs AES-192 vs. AES-256. So when you provide a 16 byte key for an AES cipher handle, AES-128 is what gets performed. Sixteen bytes in, AES-128 out, slay 💖

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⭐ RETURN ⭐

• 0 if setting the key was successful 🎉
• < 0 if an error occurred 😭

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🌈 SEE ALSO 🌈

So here's the whole friendship group, literally all of them, in the order the page gives them — and I mean the Kernel file reference too, don't skip it 🙈

Kernel file ./include/crypto/skcipher.h, struct skcipher_request(9), struct skcipher_alg(9), struct lskcipher_alg(9), Symmetric Key Cipher API(9), crypto_alloc_skcipher(9), crypto_alloc_lskcipher(9), crypto_free_skcipher(9), crypto_free_lskcipher(9), crypto_has_skcipher(9), crypto_skcipher_ivsize(9), crypto_lskcipher_ivsize(9), crypto_skcipher_blocksize(9), crypto_lskcipher_blocksize(9), crypto_skcipher_chunksize(9), crypto_lskcipher_chunksize(9), crypto_skcipher_statesize(9), crypto_lskcipher_statesize(9), crypto_skcipher_setkey(9), crypto_skcipher_reqtfm(9), crypto_skcipher_encrypt(9), crypto_skcipher_decrypt(9), crypto_skcipher_export(9), crypto_skcipher_import(9), crypto_lskcipher_encrypt(9), crypto_lskcipher_decrypt(9), Symmetric Key Cipher Request Handle(9), crypto_skcipher_reqsize(9), skcipher_request_set_tfm(9), skcipher_request_alloc(9), skcipher_request_free(9), skcipher_request_set_callback(9), skcipher_request_set_crypt(9)

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okay that's the whole page, mwah 💋 This one's from the ./include/crypto source, dated October 2026 — so yeah, remember to cite her correctly, iykyk 🧚💜