Crypt::Cipher::RC6(3)

💅 Crypt::Cipher::RC6 — the bestie guide

okay so bestie, welcome to Crypt::Cipher::RC6, aka the symmetric cipher RC6 moment, and the key size is literally 64-1024 bits. it's giving cryptography but make it iconic 🎀✨

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✨ SYNOPSIS ✨

like, here's the vibe in code form:

### 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('RC6');
my $ciphertext = $cbc->encrypt("secret data", $key, $iv);

### example 2 (slower)
use Crypt::CBC;
use Crypt::Cipher::RC6;

my $key = '...'; # length must be a valid key size for this cipher
my $iv = '...';  # 16 bytes
my $cbc = Crypt::CBC->new( -cipher=>'Cipher::RC6', -key=>$key, -iv=>$iv );
my $ciphertext = $cbc->encrypt("secret data");

example 1 is the main character, example 2 is lowkey slower but still slay 🐢💖

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🦋 DESCRIPTION 🦋

so this module implements the RC6 cipher, no cap. its interface is compatible with Crypt::CBC — iykyk 💅

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). don't come for me, that's literally what the manpage says 🫶

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🌸 METHODS 🌸

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

my $c = Crypt::Cipher::RC6->new($key);

🎀 new

my $c = Crypt::Cipher::RC6->new($key);
#or
my $c = Crypt::Cipher::RC6->new($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, and $rounds is optional — it's an integer for the number of rounds, but only if supported by the cipher, and it croaks on an invalid value. periodt. 💀

💖 encrypt

encrypts exactly one block of plaintext. the length of $plaintext must equal "blocksize" — otherwise it croaks, no cap. an empty string is accepted and returned unchanged, which is lowkey generous ngl 🥺

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

returns the encrypted block as a binary string (raw bytes). it's giving raw data realness ✨

🧚 decrypt

decrypts exactly one block of ciphertext. the length of $ciphertext must equal "blocksize" — croaks otherwise, fr fr. an empty string is accepted and returned unchanged again, iconic behavior 🌈

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

returns the decrypted block as a binary string (raw bytes). we love a reversible moment 👑

⭐ keysize

just an alias for "max_keysize" — that's the whole vibe:

$c->keysize;
#or
Crypt::Cipher::RC6->keysize;
#or
Crypt::Cipher::RC6::keysize;

🔥 blocksize

returns the cipher block size (in bytes). simple, clean, slay:

$c->blocksize;
#or
Crypt::Cipher::RC6->blocksize;
#or
Crypt::Cipher::RC6::blocksize;

🍓 max_keysize

returns the maximum key size (in bytes). the ceiling, the limit, the main character energy:

$c->max_keysize;
#or
Crypt::Cipher::RC6->max_keysize;
#or
Crypt::Cipher::RC6::max_keysize;

💜 min_keysize

returns the minimum key size (in bytes). the floor, the bare minimum, the "at least you tried" energy:

$c->min_keysize;
#or
Crypt::Cipher::RC6->min_keysize;
#or
Crypt::Cipher::RC6::min_keysize;

🌈 default_rounds

returns the cipher's default round count. the default! the blueprint! the factory setting! 💅

$c->default_rounds;
#or
Crypt::Cipher::RC6->default_rounds;
#or
Crypt::Cipher::RC6::default_rounds;

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👑 SEE ALSO 👑

• CryptX, Crypt::Cipher
• <https://en.wikipedia.org/wiki/RC6>

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and that's the whole page bestie 🫶 this iconic little manpage is brought to you by perl v5.42.0 and dated 2026-05-11 — periodt, no cap, go encrypt something cute 💖✨🎀