Crypt::...::MULTI2(3)

hii bestie 💖 welcome to Crypt::...::MULTI2(3), straight from the User Contributed Perl Documentation! this page is all about the MULTI2 symmetric cipher, and it’s giving key-size 320 bits energy 🔥

🌸 NAME 🌸

Crypt::Cipher::MULTI2 — the symmetric cipher MULTI2, key size: 320 bits. periodt 💅

✨ SYNOPSIS ✨

okay so here are the two example flows, no cap:

### 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('MULTI2');
my $ciphertext = $cbc->encrypt("secret data", $key, $iv);

### example 2 (slower)
use Crypt::CBC;
use Crypt::Cipher::MULTI2;

my $key = '...'; # length must be a valid key size for this cipher
my $iv = '...';  # 16 bytes
my $cbc = Crypt::CBC->new( -cipher=>'Cipher::MULTI2', -key=>$key, -iv=>$iv );
my $ciphertext = $cbc->encrypt("secret data");

💖 DESCRIPTION 💖

this module implements the MULTI2 cipher. its interface is compatible with Crypt::CBC. iconic compatibility behavior, honestly 🫶

⚠️ Note: 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). like, do not try to make it carry a whole data stream on its own — use the block-mode besties for that 💀

🎀 METHODS 🎀

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

my $c = Crypt::Cipher::MULTI2->new($key);

🦋 new 🦋

makes your cipher object, bestie. you can pass just the key, or key plus rounds:

my $c = Crypt::Cipher::MULTI2->new($key);
#or
my $c = Crypt::Cipher::MULTI2->new($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)

so $key is a binary string of an accepted length (peep keysize, min_keysize, max_keysize), and $rounds is an optional integer for number of rounds — if supported by the cipher; croaks on invalid value. lowkey important 💅

🔥 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, literally one block — this is not a whole-file situation, bestie 😭

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

returns the encrypted block as a binary string (raw bytes).

🌈 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 one-block rule, opposite direction 💅

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

returns the decrypted block as a binary string (raw bytes).

⭐ keysize ⭐

just an alias for max_keysize. cute shortcut energy:

$c->keysize;
#or
Crypt::Cipher::MULTI2->keysize;
#or
Crypt::Cipher::MULTI2::keysize;

🎀 blocksize 🎀

returns the cipher block size (in bytes):

$c->blocksize;
#or
Crypt::Cipher::MULTI2->blocksize;
#or
Crypt::Cipher::MULTI2::blocksize;

👑 max_keysize 👑

returns the maximum key size (in bytes):

$c->max_keysize;
#or
Crypt::Cipher::MULTI2->max_keysize;
#or
Crypt::Cipher::MULTI2::max_keysize;

🦋 min_keysize 🦋

returns the minimum key size (in bytes):

$c->min_keysize;
#or
Crypt::Cipher::MULTI2->min_keysize;
#or
Crypt::Cipher::MULTI2::min_keysize;

💜 default_rounds 💜

returns the cipher's default round count:

$c->default_rounds;
#or
Crypt::Cipher::MULTI2->default_rounds;
#or
Crypt::Cipher::MULTI2::default_rounds;

🌟 SEE ALSO 🌟

• CryptX, Crypt::Cipher
• <https://en.wikipedia.org/wiki/MULTI2>

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mwah 💖 that’s the whole page for Crypt::...::MULTI2(3)! brought to you by perl v5.42.0, dated 2026-05-11 — now go encrypt something iconic 🫶💅