Twofish(3pm)

💖 Crypt::Twofish 💖

okay bestie, so this is the manual for Crypt::Twofish(3pm) — the Perl module that does the Twofish encryption thing. and when I say it does it, I mean it ate. let's get into it 🫶

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✨ NAME ✨

Crypt::Twofish — literally the Twofish Encryption Algorithm. that's her. that's the whole vibe. 👑

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🌸 SYNOPSIS 🌸

use Crypt::Twofish;

$cipher = Crypt::Twofish->new($key);

$ciphertext = $cipher->encrypt($plaintext);

$plaintext  = $cipher->decrypt($ciphertext);

four lines. that's it. no cap, that's the entire energy of getting your encrypt on. 💅

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🦋 DESCRIPTION 🦋

so Twofish is a 128-bit symmetric block cipher with a variable length key — you can roll with 128, 192, or 256-bit keys, pick your fighter ✨. it was developed by Counterpane Labs, and it is unpatented and free for all uses, exactly as described over at <URL:http://www.counterpane.com/twofish.html>. iconic behavior honestly 🌈

this module implements Twofish encryption. it supports the Crypt::CBC interface, with the functions described down below. it also provides an interface that is call-compatible with Crypt::Twofish 1.0 — but bestie, listen to me — its use in new code is strongly discouraged. like, it's giving legacy. it's giving nostalgia. do not build your new thing on it, fr fr 💀

💜 Functions 💜

• blocksize — returns the size (in bytes) of the block. that's 16 in this case, periodt.
• keysize — returns the size (in bytes) of the key. okay so even though the module fully understands 128, 192, and 256-bit keys, it returns 16 anyway — for compatibility with Crypt::CBC. it's doing it for the team 🫶
• new($key) — this creates a new Crypt::Twofish object with the key you specified, which should be 16, 24, or 32 bytes long. choose wisely bestie ✨
• encrypt($data) — encrypts blocksize() bytes of $data and hands you back the corresponding ciphertext. slay 🔥
• decrypt($data) — decrypts blocksize() bytes of $data and hands you back the corresponding plaintext. the reverse girlies, we love them 💖

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👀 SEE ALSO 👀

• Crypt::CBC
• Crypt::Blowfish
• Crypt::TEA

the whole cipher friend group. iykyk 🧚

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🎀 ACKNOWLEDGEMENTS 🎀

• Nishant Kakani — for writing Crypt::Twofish 1.0 (and just so we're clear, this version is a complete rewrite). thank you for your service 🫡
• Tony Cook — for making the module work under Activeperl, testing on several platforms, and suggesting that I probe for features via %Config. an absolute legend, no notes ⭐

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👑 AUTHOR 👑

Abhijit Menon-Sen <ams@toroid.org>

Copyright 2001 Abhijit Menon-Sen.

this module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. 💜

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okay that's the whole page bestie, you're officially a Twofish girlie now 🌸💅✨

perl v5.42.3 · 2026-08-19 · and that's the Crypt::Twofish(3pm) energy, mwah 💋🦋