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