crypto_shash_import(9)

💖 crypto_shash_import(9) — the Kernel API Manual, bestie edition 💖

okay so you found the page for crypto_shash_import in the Kernel API Manual and honestly? it's a little one but it's iconic. it's the "put the vibes back" function. let's get into it ✨

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🌸 NAME 🌸

crypto_shash_import — import operational state 🫶

like, you're literally bringing a saved state back into the building. no cap.

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✨ SYNOPSIS ✨

int crypto_shash_import (struct shash_desc *desc , const void *in );

that's it. two args. one int coming back at you. slay. 💅

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🎀 ARGUMENTS 🎀

• desc — reference to the operational state handle the state imported into. yes, the wording is a little twisty, but it's the handle that the state gets imported into. it's the destination, the main character receiving the glow-up 💖
• in — buffer holding the state. this is the little time capsule you're feeding in 🌈

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🦋 DESCRIPTION 🦋

so crypto_shash_import imports the hash state into the operational state handle, pulling it out of the input buffer. that's the whole assignment, and it ate. 🔥

and here's the important part, bestie — that buffer should have been generated with the crypto_ahash_export function. like, the vibes have to match. you can't just hand it a random buffer and expect a slay. it's giving "the source matters", iykyk 🌸

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🧚 CONTEXT 🧚

softirq or process context. that's the vibe check on where you're allowed to call it. 💜

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⭐ RETURN ⭐

• 0 if the import was successful — we love a clean win, periodt 👑
• < 0 if an error occurred — 😭 it happens, check your buffer

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🌈 SEE ALSO 🌈

the whole friend group, fr fr. click through and say hi to all of them 💅

• Kernel file ./include/crypto/hash.h Message Digest Algorithm Definitions(9)
• struct ahash_alg(9)
• struct shash_alg(9)
• Asynchronous Message Digest API(9)
• crypto_alloc_ahash(9)
• crypto_free_ahash(9)
• crypto_has_ahash(9)
• crypto_ahash_blocksize(9)
• crypto_ahash_digestsize(9)
• crypto_ahash_statesize(9)
• crypto_ahash_reqtfm(9)
• crypto_ahash_reqsize(9)
• crypto_ahash_setkey(9)
• crypto_ahash_finup(9)
• crypto_ahash_final(9)
• crypto_ahash_digest(9)
• crypto_ahash_export(9)
• crypto_ahash_import(9)
• crypto_ahash_init(9)
• crypto_ahash_update(9)
• Asynchronous Hash Request Handle(9)
• ahash_request_set_tfm(9)
• ahash_request_alloc(9)
• ahash_request_free(9)
• ahash_request_set_callback(9)
• ahash_request_set_crypt(9)
• ahash_request_set_virt(9)
• Synchronous Message Digest API(9)
• crypto_alloc_shash(9)
• crypto_free_shash(9)
• crypto_shash_blocksize(9)
• crypto_shash_digestsize(9)
• crypto_shash_descsize(9)
• crypto_shash_setkey(9)
• crypto_shash_digest(9)
• crypto_shash_tfm_digest(9)
• crypto_shash_export(9)
• crypto_shash_init(9)
• crypto_shash_finup(9)
• crypto_shash_update(9)
• crypto_shash_final(9)

💀 tiny reminder that crypto_shash_export is the one making the buffer and crypto_shash_import is the one reading it — they're a matching set, don't split them up.

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k bye ily, go import some state responsibly 🫶✨

— this cutie lives in ./include/crypto, current as of October 2026, and it's still signed crypto_shash_import(9) 🎀