Crypt::Cipher::CAST5(3)

NAME
Crypt::Cipher::CAST5 - Symmetric cipher CAST5 (aka CAST-128), key size: 40-128 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('CAST5');
  my $ciphertext = $cbc->encrypt("secret data", $key, $iv);

  ### example 2 (slower)
  use Crypt::CBC;
  use Crypt::Cipher::CAST5;

  my $key = '...'; # length must be a valid key size for this cipher
  my $iv = '...';  # 16 bytes
  my $cbc = Crypt::CBC->new( -cipher=>'Cipher::CAST5', -key=>$key, -iv=>$iv );
  my $ciphertext = $cbc->encrypt("secret data");

DESCRIPTION
This module implements the CAST5 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 $c = Crypt::Cipher::CAST5->new($key);

  new
 my $c = Crypt::Cipher::CAST5->new($key);
 #or
 my $c = Crypt::Cipher::CAST5->new($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::CAST5->keysize;
  #or
  Crypt::Cipher::CAST5::keysize;

  blocksize
Returns the cipher block size (in bytes).

  $c->blocksize;
  #or
  Crypt::Cipher::CAST5->blocksize;
  #or
  Crypt::Cipher::CAST5::blocksize;

  max_keysize
Returns the maximum key size (in bytes).

  $c->max_keysize;
  #or
  Crypt::Cipher::CAST5->max_keysize;
  #or
  Crypt::Cipher::CAST5::max_keysize;

  min_keysize
Returns the minimum key size (in bytes).

  $c->min_keysize;
  #or
  Crypt::Cipher::CAST5->min_keysize;
  #or
  Crypt::Cipher::CAST5::min_keysize;

  default_rounds
Returns the cipher's default round count.

  $c->default_rounds;
  #or
  Crypt::Cipher::CAST5->default_rounds;
  #or
  Crypt::Cipher::CAST5::default_rounds;

SEE ALSO

•   CryptX, Crypt::Cipher

•   <https://en.wikipedia.org/wiki/CAST-128>