hmac_md5(9)

💖 hmac_md5 💖

okay bestie, welcome to the hmac_md5 page from the Kernel API Manual — yes it's a section 9 (kernel API) situation, we love a kernel-internals era 🎀

✨ NAME ✨

hmac_md5 — compute HMAC-MD5 in one shot, using a prepared key. one shot! no update calls, no drama, we're doing it all in one go 🫶

✨ SYNOPSIS ✨

void hmac_md5 (const struct hmac_md5_key *key , const u8 *data , size_t
data_len , u8 out[static MD5_DIGEST_SIZE] );

✨ ARGUMENTS ✨

• key — the prepared HMAC key. prepared!! like it's already been to hair and makeup, hmac_md5 is not doing that work for you 💅
• data — the message data. the actual content, the main character 👑
• data_len — the data length in bytes. yes we're counting, units matter 📏
• out — (output) the resulting HMAC-MD5 value. this is where the slay lands, MD5_DIGEST_SIZE of it ✨

✨ DESCRIPTION ✨

so like, if you're using the key only once, consider using hmac_md5_usingrawkey instead. literally just a thought, no pressure 🦋

✨ CONTEXT ✨

Any context. any! context-free queen, call it wherever, it does not care 🌈

✨ SEE ALSO ✨

• Kernel file ./include/crypto/md5.h
• 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_preparekey(9)
• hmac_md5_init(9)
• hmac_md5_init_usingrawkey(9)
• hmac_md5_update(9)
• hmac_md5_final(9)
• hmac_md5_usingrawkey(9)

💀 friendly reminder from your girl: that's the whole list, every single cross-reference, no skipping, iykyk

okay that's the page!! and for the cute sign-off: this beauty lives in ./include/crypto, dated October 2026 ⭐ go forth and hash, bestie, ily 🧚💜