139 lines
3.1 KiB
Perl
139 lines
3.1 KiB
Perl
package Crypt::Rijndael;
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use strict;
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use warnings;
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our $VERSION = '1.14';
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use XSLoader;
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XSLoader::load('Crypt::Rijndael', $VERSION);
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1;
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__END__
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=head1 NAME
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Crypt::Rijndael - Crypt::CBC compliant Rijndael encryption module
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=head1 VERSION
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Version 1.14
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=head1 SYNOPSIS
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use Crypt::Rijndael;
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# keysize() is 32, but 24 and 16 are also possible
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# blocksize() is 16
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$cipher = Crypt::Rijndael->new( "a" x 32, Crypt::Rijndael::MODE_CBC() );
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$cipher->set_iv($iv);
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$crypted = $cipher->encrypt($plaintext);
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# - OR -
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$plaintext = $cipher->decrypt($crypted);
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=head1 DESCRIPTION
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This module implements the Rijndael cipher, which has just been selected
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as the Advanced Encryption Standard.
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=over 4
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=item keysize
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Returns the keysize, which is 32 (bytes). The Rijndael cipher
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actually supports keylengths of 16, 24 or 32 bytes, but there is no
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way to communicate this to C<Crypt::CBC>.
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=item blocksize
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The blocksize for Rijndael is 16 bytes (128 bits), although the
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algorithm actually supports any blocksize that is any multiple of
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our bytes. 128 bits, is however, the AES-specified block size,
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so this is all we support.
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=item $cipher = Crypt::Rijndael->new( $key [, $mode] )
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Create a new C<Crypt::Rijndael> cipher object with the given key
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(which must be 128, 192 or 256 bits long). The additional C<$mode>
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argument is the encryption mode, either C<MODE_ECB> (electronic
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codebook mode, the default), C<MODE_CBC> (cipher block chaining, the
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same that C<Crypt::CBC> does), C<MODE_CFB> (128-bit cipher feedback),
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C<MODE_OFB> (128-bit output feedback), or C<MODE_CTR> (counter mode).
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ECB mode is very insecure (read a book on cryptography if you don't
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know why!), so you should probably use CBC mode.
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=item $cipher->set_iv($iv)
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This allows you to change the initial value vector used by the
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chaining modes. It is not relevant for ECB mode.
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=item $cipher->encrypt($data)
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Encrypt data. The size of C<$data> must be a multiple of C<blocksize>
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(16 bytes), otherwise this function will croak. Apart from that, it
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can be of (almost) any length.
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=item $cipher->decrypt($data)
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Decrypts C<$data>.
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=back
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=head2 Encryption modes
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Use these constants to select the cipher type:
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=over 4
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=item MODE_CBC - Cipher Block Chaining
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=item MODE_CFB - Cipher feedback
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=item MODE_CTR - Counter mode
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=item MODE_ECB - Electronic cookbook mode
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=item MODE_OFB - Output feedback
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=item MODE_PCBC - ignore this one for now :)
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=back
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=head1 SEE ALSO
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L<Crypt::CBC>, http://www.csrc.nist.gov/encryption/aes/
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=head1 BUGS
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Should EXPORT or EXPORT_OK the MODE constants.
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=head1 AUTHOR
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Currently maintained by Leon Timmermans C<< leont@cpan.org >>.
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Previously maintained by brian d foy, C<< <bdfoy@cpan.org> >>.
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Original code by Rafael R. Sevilla.
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The Rijndael Algorithm was developed by Vincent Rijmen and Joan Daemen,
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and has been selected as the US Government's Advanced Encryption Standard.
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=head1 SOURCE
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This code is in Github:
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git://github.com/leont/crypt-rijndael.git
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=head1 LICENSE
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This software is licensed under the Lesser GNU Public License v3 (29
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June 2007). See the included COPYING file for details.
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=cut
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