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lib/Crypt/DES_EEE3.pm  view on Meta::CPAN

encryption where an encrypt operation is encrypt-encrypt-encrypt, and
decrypt is decrypt-decrypt-decrypt. This implementation uses I<Crypt::DES>
to do its dirty DES work, and simply provides a wrapper around that
module: setting up the individual DES ciphers, initializing the keys,
and performing the encryption/decryption steps.

DES-EEE3 encryption requires a key size of 24 bytes.

You're probably best off not using this module directly, as the I<encrypt>
and I<decrypt> methods expect 8-octet blocks. You might want to use the
module in conjunction with I<Crypt::CBC>, for example. This would be
DES-EEE3-CBC, or triple-DES in outer CBC mode.

=head1 USAGE

=head2 $ede3 = Crypt::DES_EEE3->new($key)

Creates a new I<Crypt::DES_EEE3> object (really, a collection of three DES
ciphers), and initializes each cipher with part of I<$key>, which should be
at least 24 bytes. If it's longer than 24 bytes, the extra bytes will be
ignored.