crypto_ecdh_decode_key(9)

💅 crypto_ecdh_decode_key(9) — like, the kernel API manual edition 🎀

okay so bestie, welcome to the crypto_ecdh_decode_key page, straight out of the kernel API manual (section 9, ikyk) ✨ this one's short and sweet and honestly kinda iconic for it.

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🌸 NAME 🌸

crypto_ecdh_decode_key — decode a private key 🔑

like... that's the whole vibe. it decodes a private key. no cap.

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✨ SYNOPSIS ✨

int crypto_ecdh_decode_key (const char *buf , unsigned int len , struct
ecdh *p );

three args, one int back, we love a tidy little signature 🫶

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🦋 ARGUMENTS 🦋

• buf — the buffer holding a packet key that should be decoded. it's giving "here's the raw material, go off" 💖
• len — the length of the packet private key buffer. yes, you gotta tell it how big buf is, don't just hope for the best 🙈
• p — a buffer that the caller allocates, and it gets filled with the unpacked ECDH private key. literally you bring the memory, the function does the unpacking 💅

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👑 DESCRIPTION 👑

so here's the main character plot twist: the unpacking gets the private key by pointing p to the correct location inside buf. which means both pointers refer to the same memory, fr fr. so like... buf and p are lowkey sharing, okay? no separate copy, no dupe, just vibes and shared memory 🧚

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🔥 RETURN 🔥

• -EINVAL — if the buffer has insufficient size (aka not enough room, tragic 💀)
• 0 — on success, slay ⭐

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🌈 SEE ALSO 🌈

• Kernel file ./include/crypto/ecdh.h — the source of truth, periodt
• ECDH Helper Functions(9)
• struct ecdh(9)
• crypto_ecdh_key_len(9)
• crypto_ecdh_encode_key(9) — the other direction, the sibling, the counterpart 💜

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and that's the whole page, bestie 🍓 this came to you from ./include/crypto and it's dated October 2026 — the manual page is crypto_ecdh_decode_key(9), and yes, we ate. 💅✨🎀