hmac_md5_usingrawkey(9)

okay so bestie, this is hmac_md5_usingrawkey(9) from the Kernel API Manual, and she is literally the one-shot HMAC-MD5 function that takes a raw key. no cap. 🫶

💖 NAME 💖

hmac_md5_usingrawkey — Compute HMAC-MD5 in one shot, using a raw key. that's the whole name, and she ate. 💅

🦋 SYNOPSIS 🦋

void hmac_md5_usingrawkey (const u8 *raw_key , size_t raw_key_len ,
const u8 *data , size_t data_len , u8 out[static MD5_DIGEST_SIZE] );

✨ ARGUMENTS ✨

okay here's the cast of characters, bestie:

• raw_key — the raw HMAC-MD5 key. 🔑
• raw_key_len — the key length in bytes. All key lengths are supported ✨ (yes, all of them, no gatekeeping).
• data — the message data. 📨
• data_len — the data length in bytes. 📏
• out — (output) the resulting HMAC-MD5 value. 🎁

🌸 DESCRIPTION 🌸

okay so real talk: If you're using the key multiple times, prefer to use hmac_md5_preparekey followed by multiple calls to hmac_md5 instead. that's the whole note, bestie — she's lowkey telling you to reuse the prepared-key situation instead of doing the one-shot thing over and over. 💅

🎀 CONTEXT 🎀

Any context. literally any. she's flexible like that. 💖

🔥 SEE ALSO 🔥

go look at these icons when you're done:

• 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(9)

xoxo, your kernel bestie 🫶 — this page lives under ./include/crypto, and it's dated October 2026. mwah 💋