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 has to be 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 has to be 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. Provided interface is compliant with Crypt::CBC module.

BEWARE: This module implements just elementary "one-block-(en|de)cryption" operation - if you want to encrypt/decrypt generic data you have to use some of the cipher block modes - check for example Crypt::Mode::CBC, Crypt::Mode::CTR or Crypt::CBC (which will be slower).

METHODS¶

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

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

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

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

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

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

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

  $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>