nvme_auth_gen_session_key(9)

💅 nvme_auth_gen_session_key(9) 💅

okay so this is a page from the Kernel API Manual and it's literally about generating an ephemeral session key, bestie. crypt0 girlie hours fr fr 🔐✨

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✨ NAME ✨

nvme_auth_gen_session_key — Generate an ephemeral session key 🎀

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🌸 SYNOPSIS 🌸

int nvme_auth_gen_session_key (struct crypto_kpp *dh_tfm , const u8
*public_key , size_t public_key_len , u8 *sess_key , size_t sess_key_len
, u8 hash_id );

like, that's the whole vibe. six args, no notes. 💅

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🦋 ARGUMENTS 🦋

• dh_tfm — the Diffie-Hellman transform, and it already has the local private key set inside it. so don't come for her, she's ready 👑
• public_key — the peer's public key, i.e. the other person's half of the handshake 🫶
• public_key_len — the length of public_key. yes bestie, size matters, that's just how the buffer works 😭
• sess_key — output buffer where the session key goes. this is the main character of the whole function ngl 💖
• sess_key_len — the size of the sess_key buffer. gotta know how much room she has 🎀
• hash_id — the hash algorithm identifier. which hash are we using? that's the question ✨

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💜 DESCRIPTION 💜

straight from NVMe base specification 8.3.5.5.9 (iykyk, spec girlies rise):

The session key Ks shall be computed from the ephemeral DH key (i.e., g^xy mod p) ... by applying the hash function H selected by the HashID parameter ... (i.e., Ks = H(g^xy mod p)).

so basically: take the ephemeral Diffie-Hellman key g^xy mod p, run it through the hash function H that the HashID parameter told you to use, and boom — that's your session key Ks. the way that math just works 😭🔥

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⭐ RETURN ⭐

• 0 on success 🥳 slay
• negative errno on failure 💀 not slay

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/nvme/common/auth.c — the source, go read her 📖
• nvme_auth_augmented_challenge(9)
• nvme_auth_generate_psk(9)
• nvme_auth_generate_digest(9)
• nvme_auth_derive_tls_psk(9)

the whole auth friend group, honestly 🫶✨

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ngl bestie, the session key is only as good as your DH transform and your hash choice — this page does not say what happens if you get those wrong, so like... get them right 🙈

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and that's the page!! brought to you by ./drivers/nvme/common, dated October 2026, and it's literally called nvme_auth_gen_session_key(9) in case you forgot already 💅🎀 see u in the next manpage bestie 💖