siphash_4u64(9)

💅 siphash_4u64 — Kernel API Manual, section 9 🎀

okay so bestie, welcome to the siphash_4u64(9) page ✨ this is a kernel API manual entry and honestly? it's giving "small but mighty" and i'm obsessed 🫶

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🌸 NAME 🌸

siphash_4u64 — compute 64-bit siphash PRF value of 4 u64 💖

like, literally, that's the whole job. four u64s go in, a 64-bit siphash PRF value comes out. no cap. 👑

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✨ SYNOPSIS ✨

u64 siphash_4u64 (const u64 first , const u64 second , const u64 third ,
       const u64 forth , const siphash_key_t *key );

look at her go 😭 four u64s and a key pointer, all const because we are respectful of our inputs in this house 💅

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🦋 ARGUMENTS 🦋

• first — first u64 🍓
• second — second u64 🌸
• third — third u64 🧚
• forth — forth u64 ⭐ (yes it's spelled "forth", not "fourth" — that's the actual parameter name, don't come for me, the kernel said what it said 🙈)
• key — the siphash key 🔑 (it's a const siphash_key_t *, so she's read-only and thriving)

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🌈 SEE ALSO 🌈

kernel file ./lib/siphash.c — that's where the magic lives, bestie 💜

and the whole squad, in this exact order, because i don't make the rules:

• siphash_1u64(9)
• siphash_2u64(9)
• siphash_3u64(9)
• hsiphash_1u32(9)
• hsiphash_2u32(9)
• hsiphash_3u32(9)
• hsiphash_4u32(9)
• hsiphash_1u32(9)
• hsiphash_2u32(9)
• hsiphash_3u32(9)
• hsiphash_4u32(9)

(yes, the hsiphash_*u32 girlies get listed twice in the original and i'm faithfully reproducing that because the one rule that matters most is keeping every single detail 😤 periodt)

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ngl the 4u64 version is that girl — four inputs, one key, one u64 back. main character energy fr fr 💀✨

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and that's the page!! 🎀 brought to you by source ./lib, dated October 2026, and stamped siphash_4u64(9) at the bottom like a little signature 💖 mwah, go hash something, bestie 🫶🌸