107 lines
2.5 KiB
Perl
107 lines
2.5 KiB
Perl
|
package Crypt::Mode::CTR;
|
||
|
|
|
||
|
|
### BEWARE - GENERATED FILE, DO NOT EDIT MANUALLY!
|
||
|
|
|
||
|
|
use strict;
|
||
|
|
use warnings;
|
||
|
|
our $VERSION = '0.048';
|
||
|
|
|
||
|
|
use Crypt::Cipher;
|
||
|
|
use base 'Crypt::Mode';
|
||
|
|
|
||
|
|
sub new { my $class = shift; _new(Crypt::Cipher::_trans_cipher_name(shift), @_) }
|
||
|
|
|
||
|
|
1;
|
||
|
|
|
||
|
|
=pod
|
||
|
|
|
||
|
|
=head1 NAME
|
||
|
|
|
||
|
|
Crypt::Mode::CTR - Block cipher mode CTR [Counter mode]
|
||
|
|
|
||
|
|
=head1 SYNOPSIS
|
||
|
|
|
||
|
|
use Crypt::Mode::CTR;
|
||
|
|
my $m = Crypt::Mode::CTR->new('AES');
|
||
|
|
|
||
|
|
#(en|de)crypt at once
|
||
|
|
my $ciphertext = $m->encrypt($plaintext, $key, $iv);
|
||
|
|
my $plaintext = $m->decrypt($ciphertext, $key, $iv);
|
||
|
|
|
||
|
|
#encrypt more chunks
|
||
|
|
$m->start_encrypt($key, $iv);
|
||
|
|
my $ciphertext = $m->add('some data');
|
||
|
|
$ciphertext .= $m->add('more data');
|
||
|
|
|
||
|
|
#decrypt more chunks
|
||
|
|
$m->start_decrypt($key, $iv);
|
||
|
|
my $plaintext = $m->add($some_ciphertext);
|
||
|
|
$plaintext .= $m->add($more_ciphertext);
|
||
|
|
|
||
|
|
=head1 DESCRIPTION
|
||
|
|
|
||
|
|
This module implements CTR cipher mode. B<NOTE:> it works only with ciphers from L<CryptX> (Crypt::Cipher::NNNN).
|
||
|
|
|
||
|
|
=head1 METHODS
|
||
|
|
|
||
|
|
=head2 new
|
||
|
|
|
||
|
|
my $m = Crypt::Mode::CTR->new($cipher_name);
|
||
|
|
#or
|
||
|
|
my $m = Crypt::Mode::CTR->new($cipher_name, $ctr_mode, $ctr_width);
|
||
|
|
#or
|
||
|
|
my $m = Crypt::Mode::CTR->new($cipher_name, $ctr_mode, $ctr_width, $cipher_rounds);
|
||
|
|
|
||
|
|
# $ctr_mode .... 0 little-endian counter (DEFAULT)
|
||
|
|
# 1 big-endian counter
|
||
|
|
# 2 little-endian + RFC3686 incrementing
|
||
|
|
# 3 big-endian + RFC3686 incrementing
|
||
|
|
# $ctr_width ... counter width in bytes (DEFAULT = full block width)
|
||
|
|
# $cipher_rounds ... optional num of rounds for given cipher
|
||
|
|
|
||
|
|
=head2 encrypt
|
||
|
|
|
||
|
|
my $ciphertext = $m->encrypt($plaintext, $key, $iv);
|
||
|
|
|
||
|
|
=head2 decrypt
|
||
|
|
|
||
|
|
my $plaintext = $m->decrypt($ciphertext, $key, $iv);
|
||
|
|
|
||
|
|
=head2 start_encrypt
|
||
|
|
|
||
|
|
See example below L</finish>.
|
||
|
|
|
||
|
|
=head2 start_decrypt
|
||
|
|
|
||
|
|
See example below L</finish>.
|
||
|
|
|
||
|
|
=head2 add
|
||
|
|
|
||
|
|
See example below L</finish>.
|
||
|
|
|
||
|
|
=head2 finish
|
||
|
|
|
||
|
|
#encrypt more chunks
|
||
|
|
$m->start_encrypt($key, $iv);
|
||
|
|
my $ciphertext = '';
|
||
|
|
$ciphertext .= $m->add('some data');
|
||
|
|
$ciphertext .= $m->add('more data');
|
||
|
|
|
||
|
|
#decrypt more chunks
|
||
|
|
$m->start_decrypt($key, $iv);
|
||
|
|
my $plaintext = '';
|
||
|
|
$plaintext .= $m->add($some_ciphertext);
|
||
|
|
$plaintext .= $m->add($more_ciphertext);
|
||
|
|
|
||
|
|
=head1 SEE ALSO
|
||
|
|
|
||
|
|
=over
|
||
|
|
|
||
|
|
=item * L<CryptX|CryptX>, L<Crypt::Cipher|Crypt::Cipher>
|
||
|
|
|
||
|
|
=item * L<Crypt::Cipher::AES|Crypt::Cipher::AES>, L<Crypt::Cipher::Blowfish|Crypt::Cipher::Blowfish>, ...
|
||
|
|
|
||
|
|
=item * L<https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Counter_.28CTR.29|https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Counter_.28CTR.29>
|
||
|
|
|
||
|
|
=back
|