---
name: "Crypt::Stream::Rabbit"
section: "3pm"
platform: "linux"
package: "perl-cryptx"
version: "0.091-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/Crypt::Stream::Rabbit"
---

# Crypt::Stream::Rabbit(3pm)

Stream cipher Rabbit

## NAME

Crypt::Stream::Rabbit - Stream cipher Rabbit

## SYNOPSIS

```
   use Crypt::Stream::Rabbit;
   # encrypt
   my $key = "1234567890123456";
   my $iv  = "12345678";
   my $enc_stream = Crypt::Stream::Rabbit->new($key, $iv);
   my $ct = $enc_stream->crypt("plain message");
   # decrypt
   my $dec_stream = Crypt::Stream::Rabbit->new($key, $iv);
   my $pt = $dec_stream->crypt($ct);
```

## DESCRIPTION

Provides an interface to the Rabbit stream cipher.

## METHODS

Unless noted otherwise, assume `$stream` is an existing stream object created via `"new"`, for example:

```
 my $stream = Crypt::Stream::Rabbit->new($key, $iv);
```

### new

```
 my $stream = Crypt::Stream::Rabbit->new($key, $iv);
 # $key .. [binary string] key length must be at most 16 bytes
 # $iv  .. [binary string] IV length must be at most 8 bytes
 my $stream = Crypt::Stream::Rabbit->new($key);
 # note: new($key) skips IV setup entirely, while new($key, "") performs
 #       IV setup with a zero-length IV. These produce different keystreams.
```

### crypt

Encrypts or decrypts data. The output has the same length as the input. Returns a binary string (raw bytes).

The input is converted using Perl's usual scalar stringification. Passing `"undef"` is treated as an empty string with the usual warning, and numeric scalars are stringified before processing.

```
 my $ciphertext = $stream->crypt($plaintext);
 #or
 my $plaintext = $stream->crypt($ciphertext);
```

### keystream

Returns `$length` bytes of raw keystream as a binary string.

The length is taken using Perl's usual numeric coercion. Values that coerce to an oversized unsigned length are rejected as too large.

```
 my $random_key = $stream->keystream($length);
```

### clone

Returns a copy of the stream cipher object in its current state.

```
 my $stream2 = $stream->clone();
```

## SEE ALSO

- •

  Crypt::Stream::RC4, Crypt::Stream::ChaCha, Crypt::Stream::Salsa20, Crypt::Stream::Sober128

- •

  \<https://en.wikipedia.org/wiki/Rabbit\_(cipher)\>

- •

  \<https://www.rfc-editor.org/rfc/rfc4503\>