Digest::JHash(3pm)

💖 Digest::JHash 💖

okay so bestie. welcome to Digest::JHash — a Perl extension for the 32 bit Jenkins Hashing Algorithm. no cap, that's the whole vibe. ✨

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🌸 SYNOPSIS 🌸

use Digest::JHash qw(jhash);

$digest = jhash($data);

# note that calling jhash() directly like this is the fastest way:

$digest = Digest::JHash::jhash($data);

like. look at it. it's giving efficiency 🦋

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💅 DESCRIPTION 💅

The Digest::JHash module lets you use the fast JHash hashing algorithm developed by Bob Jenkins from, like, inside your Perl programs. it's literally right there. 🙈

So the algorithm takes as input a message of arbitrary length and produces as output a 32-bit "message digest" of the input, in the form of an unsigned long integer. slay.

Call it a low calorie version of MD5 if you like. 🍓 honestly? accurate.

See http://burtleburtle.net/bob/hash/doobs.html for more information — go read it, it's iconic. 👑

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🎀 FUNCTIONS 🎀

jhash($data)

This function will calculate the JHash digest of the "message" in $data and return a 32 bit integer result (an unsigned long in the C). so cute. so small. so fast. 💖

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🧚 EXPORTS 🧚

None by default — but you can have the jhash() function if you ask nicely. 💅 and yeah, see below for reasons not to use Exporter (spoiler: it is slower than a direct call, oop 😭).

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⭐ SPEED NOTE ⭐

okay so if speed is a major issue — and bestie, sometimes it is — listen up:

it's roughly twice as fast to call the jhash() function like this:

Digest::JHash::jhash('message')

than it is to import the jhash() method using Exporter so you can call it as simply:

jhash('message')

wild, right?? 😭 the shortcut is the longcut. there's a short script that demonstrates the speed of different calling methods — direct, OO and Imported — in examples/oo_vs_func.pl. go run it, it ate. 🔥

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👑 AUTHORS 👑

• The JHash implementation was written by Bob Jenkins <bob_jenkins [at] burtleburtle [dot] net>.
• This perl extension was written by Andrew Towers <mariofrog [at] bigpond [dot] com>.
• A few mods were added by James Freeman <airmedical [at] gmail [dot] com>).

three legends fr fr. 🫶

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🦋 SEE ALSO 🦋

http://burtleburtle.net/bob/hash/doobs.html

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🌈 LICENSE 🌈

This package is free software and is provided "as is" without express or implied warranty. It may be used, redistributed and/or modified under the terms of the Artistic License 2.0. A copy is include in this distribution. 🎀

shoutout to the typo "include" — I'm keeping it exactly as written because we do not touch the facts, bestie. periodt. 💅

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and that's the whole page!! this doc was served to you by perl v5.42.3, dated 2026-08-19, filed under Digest::JHash(3pm). mwah 💋 go hash something, main character. ✨🌸🦋