100 lines
2.1 KiB
Perl
100 lines
2.1 KiB
Perl
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package Crypt::Mode::OFB;
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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::OFB - Block cipher mode OFB [Output feedback]
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=head1 SYNOPSIS
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use Crypt::Mode::OFB;
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my $m = Crypt::Mode::OFB->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 OFB 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::OFB->new('AES');
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#or
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my $m = Crypt::Mode::OFB->new('AES', $cipher_rounds);
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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#Output_feedback_.28OFB.29|https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Output_feedback_.28OFB.29>
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=back
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