crypto_shash_tfm_digest(9)

💖 crypto_shash_tfm_digest(9) 💖

okay so bestie, welcome to the Kernel API Manual — this one's a little crypto baddie and she's honestly so convenient 🎀

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✨ NAME ✨

crypto_shash_tfm_digest — calculate message digest for buffer 💅

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🌸 SYNOPSIS 🌸

int crypto_shash_tfm_digest(struct crypto_shash *tfm, const u8 *data,
                            unsigned int len, u8 *out);

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🦋 ARGUMENTS 🦋

• tfm — the hash transformation object, aka the main character of this whole operation 👑
• data — see crypto_shash_update
• len — see crypto_shash_update
• out — see crypto_shash_final

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💜 DESCRIPTION 💜

So this is the simplified version of crypto_shash_digest for users who do not want to allocate their own hash descriptor (shash_desc). Like, why would you when she'll do it for you? 🙈

Instead, crypto_shash_tfm_digest takes a hash transformation object (crypto_shash) directly, and it allocates a hash descriptor on the stack internally. Slay, right? ✨

but ngl bestie — note that this stack allocation may be fairly large 😭 so keep that in mind, fr fr.

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🌈 CONTEXT 🌈

Softirq or process context. That's it, that's the vibe 🫶

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⭐ RETURN ⭐

0 on success; < 0 if an error occurred. Simple as that, no cap 💀

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🎀 SEE ALSO 🎀

• 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_export(9)
• crypto_shash_import(9)
• crypto_shash_init(9)
• crypto_shash_finup(9)
• crypto_shash_update(9)
• crypto_shash_final(9)

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and that's the whole page, bestie — go forth and digest 💖✨

source: ./include/crypto · version/date: October 2026 · crypto_shash_tfm_digest(9) — mwah, luv u, bye 🫶🎀