NAME
    Crypt::Camellia - Perl Camellia encryption module

SYNOPSIS
      use Crypt::Camellia;
      my $cipher     = Crypt::Camellia->new($key); 
      my $ciphertext = $cipher->encrypt($plaintext);
      my $plaintext  = $cipher->decrypt($ciphertext);

      # more likely
      use Crypt::CBC;
      $cipher = Crypt::CBC->new( -key    => 'my secret key',
                                 -cipher => 'Camellia'
                                );

DESCRIPTION
    This module implements Camelia 128-bit Block Cipher for perl. For
    Camellia. Check
    <https://info.isl.ntt.co.jp/crypt/eng/camellia/index_s.html>. Here is an
    exerpt of that page.

      Camellia is a symmetric key block cipher developed jointly in 2000 by
      world top class encryption researchers at NTT and Mitsubishi Electric
      Corporation. Technologically speaking, Camellia naturally has not only
      a high level of security, but also excellent efficiency and practical
      characteristics. It can be implemented at high performance by software
      on various platforms. In regard to hardware implementation, compact
      and low-power consumption type implementation as well as high-speed
      implementation is possible.

      Based on these technological advantages, Camellia has been
      internationally recognized, for example the selection project on the
      European recommendation of strong cryptographic primitives, NESSIE,
      evaluated Camellia to have "many similarities to the AES, so much of
      the analysis for the AES is also applicable to Camellia." Currently,
      Camellia is the only cipher internationally recognized which has the
      same level of security and performance as AES, and is selected for
      many international standard/recommended ciphers. In particular, as
      Japanese domestic ciphers, this is the first case to be approved as
      IETF standard ciphers (Proposed Standard RFC) .

    Crypt::Camellia has the following methods:

       blocksize()
       keysize()
       encrypt()
       decrypt()

    Like many Crypt:: modules like Crypt::Blowfish and Crypt::DES, this
    module works as a backend of Crypt::CBC.

FUNCTIONS
    blocksize
      Returns the size (in bytes) of the block cipher. Currently this is a
      fixed value of 16.

    new
        my $cipher = Crypt::Camellia->new($key);

      This creates a new Crypt::Camellia BlockCipher object, using $key,
      where $key is a key of "keysize()" bytes (minimum of eight bytes).

    encrypt
        my $ciphertext = $cipher->encrypt($plaintext);

      This function encrypts $plaintext and returns the $ciphertext where
      $plaintext and $ciphertext must be of "blocksize()" bytes. (hint:
      Camellia is an 16 byte block cipher)

    decrypt
        my $plaintext = $cipher->decrypt($ciphertext);

      This function decrypts $ciphertext and returns the $plaintext where
      $plaintext and $ciphertext must be of "blocksize()" bytes. (hint: see
      previous hint)

EXAMPLE
      my $key = pack("H16", "0123456789ABCDEF");  # min. 8 bytes
      my $cipher = Crypt::Camellia->new($key);
      my $ciphertext = $cipher->encrypt("plaintex");# SEE NOTES 
      print unpack("H16", $ciphertext), "\n";

NOTES
    For practical uses use this module via Crypt::CBC rather than directly.

SEE ALSO
    Crypt::CBC, Crypt::Rijndael, Crypt::DES, Crypt::IDEA

AUTHOR
    Dan Kogai, <dankogai@dan.co.jp>

    Current maintainer is Hiroyuki OYAMA <oyama@module.jp>.

    And

    NTT <http://info.isl.ntt.co.jp/crypt/camellia/index.html>

COPYRIGHT AND LICENSE
    Copyright (C) 2006 by Dan Kogai

    This library is free software; you can redistribute it and/or modify it
    under the same terms as Perl itself, either Perl version 5.8.8 or, at
    your option, any later version of Perl 5 you may have available.

    Except for anything under camellia-*/ directory which is licensed as
    follows:

     Copyright (c) 2006
      NTT (Nippon Telegraph and Telephone Corporation) . All rights reserved.

     Redistribution and use in source and binary forms, with or without
     modification, are permitted provided that the following conditions
     are met:
     1. Redistributions of source code must retain the above copyright
        notice, this list of conditions and the following disclaimer as
        the first lines of this file unmodified.
     2. Redistributions in binary form must reproduce the above copyright
        notice, this list of conditions and the following disclaimer in the
        documentation and/or other materials provided with the distribution.

     THIS SOFTWARE IS PROVIDED BY NTT ``AS IS'' AND ANY EXPRESS OR IMPLIED
     WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     IN NO EVENT SHALL NTT BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.