hmac_md5_preparekey(9)

okay so bestie 😭 this is hmac_md5_preparekey(9) from the Kernel API Manual, and it's basically the key-prep girlie for HMAC-MD5 💅

💖 NAME 💖

hmac_md5_preparekey — prepare a key for HMAC-MD5. It's giving "set up the key structure so it's ready to go" energy, no cap ✨

🦋 SYNOPSIS 🦋

void hmac_md5_preparekey (struct hmac_md5_key *key , const u8 *raw_key ,
       size_t raw_key_len );

So you call it, and it returns void — no return value to obsess over 💅

🌸 ARGUMENTS 🌸

• key — (output) the key structure to initialize. Like, this is the thing you're filling in, okay? 🎀
• raw_key — the raw HMAC-MD5 key. The actual key material, no filter.
• raw_key_len — the key length in bytes. All key lengths are supported — every single one, no exceptions, periodt 💖

🎀 NOTE 🎀

The caller is responsible for zeroizing both the struct hmac_md5_key and the raw key once they are no longer needed. That's a you job, bestie — don't leave key material lying around 😭

✨ CONTEXT ✨

Any context. Literally any — she's flexible like that 🦋

💜 SEE ALSO 💜

Kernel file ./include/crypto/md5.h; also the whole squad:

• struct md5_ctx(9)
• md5_init(9)
• md5_update(9)
• md5_final(9)
• md5(9)
• struct hmac_md5_key(9)
• struct hmac_md5_ctx(9)
• hmac_md5_init(9)
• hmac_md5_init_usingrawkey(9)
• hmac_md5_update(9)
• hmac_md5_final(9)
• hmac_md5(9)
• hmac_md5_usingrawkey(9)

mwah 💋 cute little sign-off: source/version is ./include/crypto, dated October 2026, and this page is hmac_md5_preparekey(9) — that's the whole footer, but make it fancy 🫶