115 lines
2.7 KiB
Perl
115 lines
2.7 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 $VERSION = '0.058_002';
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use Crypt::Cipher;
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sub encrypt {
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my ($self, $pt) = (shift, shift);
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local $SIG{__DIE__} = \&CryptX::_croak;
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$self->start_encrypt(@_)->add($pt);
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}
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sub decrypt {
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my ($self, $ct) = (shift, shift);
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local $SIG{__DIE__} = \&CryptX::_croak;
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$self->start_decrypt(@_)->add($ct);
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}
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sub CLONE_SKIP { 1 } # prevent cloning
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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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# $cipher_name .. one of 'AES', 'Anubis', 'Blowfish', 'CAST5', 'Camellia', 'DES', 'DES_EDE',
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# 'KASUMI', 'Khazad', 'MULTI2', 'Noekeon', 'RC2', 'RC5', 'RC6',
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# 'SAFERP', 'SAFER_K128', 'SAFER_K64', 'SAFER_SK128', 'SAFER_SK64',
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# 'SEED', 'Skipjack', 'Twofish', 'XTEA', 'IDEA', 'Serpent'
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# simply any <NAME> for which there exists Crypt::Cipher::<NAME>
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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, $iv);
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=head2 start_encrypt
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$m->start_encrypt($key, $iv);
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=head2 start_decrypt
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$m->start_decrypt($key, $iv);
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=head2 add
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# in encrypt mode
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my $plaintext = $m->add($ciphertext);
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# in decrypt mode
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my $ciphertext = $m->add($plaintext);
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=head1 SEE ALSO
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=over
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=item * L<CryptX|CryptX>, L<Crypt::Cipher>
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=item * L<Crypt::Cipher::AES>, L<Crypt::Cipher::Blowfish>, ...
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=item * L<https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Counter_.28CTR.29>
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=back
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=cut
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