spum_hash_pad_len(9)

📦 version 7.3.1, in nixpkgs unstable

✨ spum_hash_pad_len(9) ✨

okay bestie, welcome to the spum_hash_pad_len(9) page 💅 this is from the Kernel API Manual, and it's literally the glow-up guide for hash padding lengths. it's giving "small function, big responsibilities" ngl 🫶

🌸 NAME 🌸

spum_hash_pad_len — calculates the length of hash padding you need to stretch your data out to a full block size ✨ like, it's the function that does the math so your data fits perfectly in the block, no awkward leftovers, periodt.

🎀 SYNOPSIS 🎀

u16 spum_hash_pad_len (enum hash_alg hash_alg , enum hash_mode hash_mode
, u32 chunksize , u16 hash_block_size );

that's the whole vibe right there — four arguments, one u16 coming back out 💖

🦋 ARGUMENTS 🦋

  • hash_alg — the hash algorithm, iykyk 🧚
  • hash_mode — the hash mode, very much its own thing
  • chunksize — the length of your data, measured in bytes 🌸
  • hash_block_size — the size of one block of data for that hash algorithm ✨

💜 DESCRIPTION 💜

okay so here's the tea ☕ this function reserves space for 1 byte (0x80) — that's the start of the pad — plus the total length, stored as a u64. that's it, that's the whole job, and it ate 💅

👑 RETURN 👑

the length of the hash pad, in bytes 💖 that's the number you get back, no cap.

🌈 SEE ALSO 🌈

all the other icons in the family, fr fr 🔥 and yes, they live in the kernel file ./drivers/crypto/bcm/spu.c:

and that's the whole page, bestie 🫶 this iconic little entry lives in ./drivers/crypto/bcm and it's dated October 2026 — the spum_hash_pad_len(9) manual, signed, sealed, slayed 💅✨🎀

📦 where this page comes from