Crypt::Cipher::RC5(3) User Contributed Perl Documentation
NAME
Crypt::Cipher::RC5 - Symmetric cipher RC5, key size: 64-1024 bits
SYNOPSIS
### 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('RC5');
my $ciphertext = $cbc->encrypt("secret data", $key, $iv);
### example 2 (slower)
use Crypt::CBC;
use Crypt::Cipher::RC5;
my $key = '...'; # length must be a valid key size for this cipher
my $iv = '...'; # 16 bytes
my $cbc = Crypt::CBC->new( -cipher=>'Cipher::RC5', -key=>$key, -iv=>$iv );
my $ciphertext = $cbc->encrypt("secret data");
DESCRIPTION
This module implements the RC5 cipher. Its interface is compatible with
Crypt::CBC.
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).
METHODS
Unless noted otherwise, assume $c is an existing cipher object created
via "new", for example:
my $c = Crypt::Cipher::RC5->new($key);
new
my $c = Crypt::Cipher::RC5->new($key);
#or
my $c = Crypt::Cipher::RC5->new($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)
encrypt
Encrypts exactly one block of plaintext. The length of $plaintext must
equal "blocksize"; croaks otherwise. An empty string is accepted and
returned unchanged.
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.
my $plaintext = $c->decrypt($ciphertext);
Returns the decrypted block as a binary string (raw bytes).
keysize
Just an alias for "max_keysize".
$c->keysize;
#or
Crypt::Cipher::RC5->keysize;
#or
Crypt::Cipher::RC5::keysize;
blocksize
Returns the cipher block size (in bytes).
$c->blocksize;
#or
Crypt::Cipher::RC5->blocksize;
#or
Crypt::Cipher::RC5::blocksize;
max_keysize
Returns the maximum key size (in bytes).
$c->max_keysize;
#or
Crypt::Cipher::RC5->max_keysize;
#or
Crypt::Cipher::RC5::max_keysize;
min_keysize
Returns the minimum key size (in bytes).
$c->min_keysize;
#or
Crypt::Cipher::RC5->min_keysize;
#or
Crypt::Cipher::RC5::min_keysize;
default_rounds
Returns the cipher's default round count.
$c->default_rounds;
#or
Crypt::Cipher::RC5->default_rounds;
#or
Crypt::Cipher::RC5::default_rounds;
SEE ALSO
o CryptX(3), Crypt::Cipher(3)
o <https://en.wikipedia.org/wiki/RC5>
perl v5.34.3 2026-05-11 Crypt::Cipher::RC5(3)
cryptx 0.89.0 - Generated Mon May 11 11:34:35 CDT 2026