HMACSUM(1)

📦 in opensuse-leap 16.0

💅 hmacsum — like, the manual page, but make it make sense

okay so bestie, welcome to hmacsum() from the LOCAL manual 🎀 this is the whole entire page, nothing skipped, nothing rounded off. let's go ✨

🌸 NAME 🌸

hmacsum — literally calculates Hash-based Message Authentication Codes (HMACs) of the data in a file. that's it, that's the whole job, and it ate 💅

🦋 SYNOPSIS 🦋

hmacsum [-d digest_type] [-p process_buffer_size] [-hvV] hmac_files

like, that's the shape of it — short, iconic, no notes 👑

✨ DESCRIPTION ✨

hmacsum is a utility to calculate Hash-based Message Authentication Codes (HMACs) of the data in a file. no cap, that's the entire personality 🫶

hmacsum is part of the libhmac package. libhmac is a library to support various Hash-based Message Authentication Codes (HMAC). it's giving supportive bestie energy fr fr 🌈

source the source file.

okay bestie that last line is just. sitting there. in the original. we do not know why. we are not going to pretend we do 😭 it's in the page, so it's in the page 🙈

The options are as follows:

  • -d digest_type — calculate digest (hash) types option. the types are md5 (that's the default, in case you were wondering 👀), sha1, sha256, sha512. and yes bestie, multiple types can be combined with a , — go off, stack them 💖
  • -h — shows this help. short king behavior honestly 🌸
  • -p process_buffer_size — specify the process buffer size. default is 32768 bytes, which is a very specific number and we respect it 🎀
  • -v — verbose output to stderr. she's chatty and she's telling you about it ✨
  • -V — print version. just the version. no drama. iconic 👑

🧚 ENVIRONMENT 🧚

None. literally none. no environment variables, the vibes are self-contained 💜

🍓 FILES 🍓

None. same deal. nothing to look at here, move along 🌸

🔥 EXAMPLES 🔥

here's the moment you've been waiting for, the demo, the main character scene ⭐

# hmacsum -d md5,sha1,sha256 file.dat
hmacsum 20140112

MD5 hash calculated over data:          dd05dd0a66337ba6ad12e07779b8f36e
SHA1 hash calculated over data:         55f9b57af542db0ed668eaa647837f106282c244
SHA256 hash calculated over data:       0a794e4172209147eb8ce21fc447591a2cb443dbbb1df71d7bef1a536bf2b552

look at those three hashes. three of them. one command. she's efficient, she's organized, she's the moment 👑💅

😭 DIAGNOSTICS 😭

Errors, verbose and debug output are printed to stderr when verbose output -v is enabled.

heads up bestie: verbose and debug output are only printed when enabled at compilation 🫶 so if you're not seeing the extra chatter, that's why — it's a build thing, not a you thing 🙈

💀 BUGS 💀

Please report bugs of any kind to <joachim.metz@gmail.com> or on the project website: https://github.com/libyal/libhmac/

found a bug? tell on it. respectfully. with a link 🌈

🌸 AUTHOR 🌸

These man pages were written by Joachim Metz. ty for your service king 🫶✨

Copyright (C) 2011-2024, Joachim Metz <joachim.metz@gmail.com>.

This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

read that again bestie — NO warranty. not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. it's free software, it's not a promise 💀

🦋 SEE ALSO 🦋

libhmac — go read that one next, it's the whole family 🌈

and that's the page!! hmacsum, from libhmac, dated January 14, 2014 — yeah she's vintage, she's a classic, she still slays 💅🎀 mwah, go hash something 💖

📦 where this page comes from