rsa_parse_priv_key(9)

🎀 rsa_parse_priv_key(9) 🎀

okay so bestie, we're in the Kernel API Manual today and the vibe is crypto. This is rsa_parse_priv_key — yes it's a mouthful, yes it's iconic 💅

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✨ NAME ✨

rsa_parse_priv_key — it decodes the BER encoded buffer and stores in the provided struct rsa_key, pointers to the raw key as is, so that the caller can copy it or MPI parse it, etc. 🦋

Like, it doesn't copy anything for you, it just hands you the pointers. Main character energy of "you handle the rest, bb". 👑

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🌸 SYNOPSIS 🌸

int rsa_parse_priv_key (struct rsa_key *rsa_key , const void *key ,
unsigned int key_len );

That's the whole thing. Three args, one int back. Lowkey elegant ngl. ✨

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💖 ARGUMENTS 💖

• rsa_key — your struct rsa_key, i.e. the key representation. This is where the parsed stuff lands. 🫶
• key — the key itself, in BER format. Yes, BER. Not DER discourse today, it's literally BER. 🙈
• key_len — the length of key. You do have to tell it how long your key is, it's not psychic. 😭

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⭐ RETURN ⭐

0 on success, or an error code in case of error. No cap — that's the whole contract. If you get 0 you're slaying; anything else, go read the error code and figure out what went wrong. 💀

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🦋 SEE ALSO 🦋

• Kernel file ./crypto/rsa_helper.c — the actual source, go peek 👀
• rsa_parse_pub_key(9) — the public key sibling, equally valid, equally iconic 🌈

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ngl bestie, remember: the pointers you get back point at the raw key as is, so if you needed your own copy... that's a you problem, go copy it. 🧚

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and that's the page! brought to you by the ./crypto directory, October 2026 edition — mwah, drink water, and don't leak your private keys 💜