Crypt::...Skipjack(3)

okay bestie, welcome to the Crypt::...Skipjack(3) page from User Contributed Perl Documentation — yes, that's the manual name, and we're about to make it cute ✨💅

🎀 NAME 🎀

Crypt::Cipher::Skipjack — symmetric cipher Skipjack, key size: 80 bits 💖

✨ SYNOPSIS ✨

okay so here's the group-chat demo reel, fr fr. Two examples, same energy, second one is lowkey slower 👀

### example 1
use Crypt::Mode::CBC;

my $key = '...'; # length must be a valid key size for this cipher
my $iv = '...';  # 16 bytes
my $cbc = Crypt::Mode::CBC->new('Skipjack');
my $ciphertext = $cbc->encrypt("secret data", $key, $iv);

### example 2 (slower)
use Crypt::CBC;
use Crypt::Cipher::Skipjack;

my $key = '...'; # length must be a valid key size for this cipher
my $iv = '...';  # 16 bytes
my $cbc = Crypt::CBC->new( -cipher=>'Cipher::Skipjack', -key=>$key, -iv=>$iv );
my $ciphertext = $cbc->encrypt("secret data");

🦋 DESCRIPTION 🦋

This module implements the Skipjack cipher. Its interface is compatible with Crypt::CBC. That's the whole flex, no cap. 💅

Note bestie: this module only implements single-block encryption and decryption. For general data, use a block mode such as Crypt::Mode::CBC, Crypt::Mode::CTR, or Crypt::CBC (which is slower). Periodt — don't try to make it do full-data vibes by itself. 😭

🌈 METHODS 🌈

Unless noted otherwise, assume $c is an existing cipher object created via new, for example:

my $c = Crypt::Cipher::Skipjack->new($key);

💫 new 💫

my $c = Crypt::Cipher::Skipjack->new($key);
#or
my $c = Crypt::Cipher::Skipjack->new($key, $rounds);

# $key .... [binary string] key of an accepted length (see keysize, min_keysize, max_keysize)
# $rounds . [integer] optional, number of rounds (if supported by the cipher; croaks on invalid value)

Okay so $key is a [binary string] key of an accepted length (peep keysize, min_keysize, max_keysize 👀). $rounds is an [integer], optional, number of rounds (if supported by the cipher; croaks on invalid value). So if that's not supported by the cipher, don't come for it. 🙈

🔐 encrypt 🔐

Encrypts exactly one block of plaintext. The length of $plaintext must equal blocksize; croaks otherwise. An empty string is accepted and returned unchanged. Yes bestie, empty string gets a free pass. ✨

my $ciphertext = $c->encrypt($plaintext);

Returns the encrypted block as a binary string (raw bytes). Raw bytes, no aesthetic filtering. 💅

🔓 decrypt 🔓

Decrypts exactly one block of ciphertext. The length of $ciphertext must equal blocksize; croaks otherwise. An empty string is accepted and returned unchanged. Same energy, opposite direction. 🫶

my $plaintext = $c->decrypt($ciphertext);

Returns the decrypted block as a binary string (raw bytes). Literally raw bytes, iykyk. 😭

📏 keysize 📏

Just an alias for max_keysize. That's it, that's the whole vibe. 💖

$c->keysize;
#or
Crypt::Cipher::Skipjack->keysize;
#or
Crypt::Cipher::Skipjack::keysize;

🧱 blocksize 🧱

Returns the cipher block size (in bytes). Big "measure twice, encrypt once" energy. 📐

$c->blocksize;
#or
Crypt::Cipher::Skipjack->blocksize;
#or
Crypt::Cipher::Skipjack::blocksize;

🏆 max_keysize 🏆

Returns the maximum key size (in bytes). Main character key energy, maximum slay. 👑

$c->max_keysize;
#or
Crypt::Cipher::Skipjack->max_keysize;
#or
Crypt::Cipher::Skipjack::max_keysize;

🌱 min_keysize 🌱

Returns the minimum key size (in bytes). Tiny but valid, bestie. 🍓

$c->min_keysize;
#or
Crypt::Cipher::Skipjack->min_keysize;
#or
Crypt::Cipher::Skipjack::min_keysize;

🔁 default_rounds 🔁

Returns the cipher's default round count. The default is the default, no cap. 🔥

$c->default_rounds;
#or
Crypt::Cipher::Skipjack->default_rounds;
#or
Crypt::Cipher::Skipjack::default_rounds;

🧚 SEE ALSO 🧚

• CryptX, Crypt::Cipher — the usual suspects, go check them out bestie.
• <https://en.wikipedia.org/wiki/Skipjack_(cipher)> — the Skipjack wiki moment, exactly as listed.

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mwah 💋 source/version check: perl v5.42.0, dated 2026-05-11 — and yes, this is still the Crypt::...Skipjack(3) manual page. Bye bestie, go encrypt responsibly! 🎀✨