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package File::KDBX::IO::Crypt;
# ABSTRACT: Encrypter/decrypter IO handle
use warnings;
use strict;
use Errno;
use File::KDBX::Error;
use File::KDBX::Util qw(:class :empty);
use namespace::clean;
extends 'File::KDBX::IO';
our $VERSION = '0.906'; # VERSION
our $BUFFER_SIZE = 16384;
our $ERROR;
my %ATTRS = (
cipher => undef,
);
while (my ($attr, $default) = each %ATTRS) {
no strict 'refs'; ## no critic (ProhibitNoStrict)
*$attr = sub {
my $self = shift;
*$self->{$attr} = shift if @_;
*$self->{$attr} //= (ref $default eq 'CODE') ? $default->($self) : $default;
};
}
sub new {
my $class = shift;
my %args = @_ % 2 == 1 ? (fh => shift, @_) : @_;
my $self = $class->SUPER::new;
$self->_fh($args{fh}) or throw 'IO handle required';
$self->cipher($args{cipher}) or throw 'Cipher required';
return $self;
}
sub _FILL {
my ($self, $fh) = @_;
$ENV{DEBUG_STREAM} and print STDERR "FILL\t$self\n";
my $cipher = $self->cipher or return;
$fh->read(my $buf = '', $BUFFER_SIZE);
if (0 < length($buf)) {
my $plaintext = eval { $cipher->decrypt($buf) };
if (my $err = $@) {
$self->_set_error($err);
return;
}
return $plaintext if 0 < length($plaintext);
}
# finish
my $plaintext = eval { $cipher->finish };
if (my $err = $@) {
$self->_set_error($err);
return;
}
$self->cipher(undef);
return $plaintext;
}
sub _WRITE {
my ($self, $buf, $fh) = @_;
$ENV{DEBUG_STREAM} and print STDERR "WRITE\t$self\n";
my $cipher = $self->cipher or return 0;
my $new_data = eval { $cipher->encrypt($buf) } || '';
if (my $err = $@) {
$self->_set_error($err);
return 0;
}
$self->_buffer_out_add($new_data) if nonempty $new_data;
return length($buf);
}
sub _POPPED {
my ($self, $fh) = @_;
$ENV{DEBUG_STREAM} and print STDERR "POPPED\t$self\n";
return if $self->_mode ne 'w';
my $cipher = $self->cipher or return;
my $new_data = eval { $cipher->finish } || '';
if (my $err = $@) {
$self->_set_error($err);
return;
}
$self->_buffer_out_add($new_data) if nonempty $new_data;
$self->cipher(undef);
$self->_FLUSH($fh);
}
sub _FLUSH {
my ($self, $fh) = @_;
$ENV{DEBUG_STREAM} and print STDERR "FLUSH\t$self\n";
return if $self->_mode ne 'w';
my $buffer = $self->_buffer_out;
while (@$buffer) {
my $read = shift @$buffer;
next if empty $read;
$fh->print($read) or return -1;
}
return 0;
}
sub _set_error {
my $self = shift;
$ENV{DEBUG_STREAM} and print STDERR "err\t$self\n";
if (exists &Errno::EPROTO) {
$! = &Errno::EPROTO;
}
elsif (exists &Errno::EIO) {
$! = &Errno::EIO;
}
$self->cipher(undef);
$self->_error($ERROR = File::KDBX::Error->new(@_));
}
1;
__END__
=pod
=encoding UTF-8
=head1 NAME
File::KDBX::IO::Crypt - Encrypter/decrypter IO handle
=head1 VERSION
version 0.906
=head1 SYNOPSIS
use File::KDBX::IO::Crypt;
use File::KDBX::Cipher;
my $cipher = File::KDBX::Cipher->new(...);
open(my $out_fh, '>:raw', 'ciphertext.bin');
$out_fh = File::KDBX::IO::Crypt->new($out_fh, cipher => $cipher);
print $out_fh $plaintext;
close($out_fh);
open(my $in_fh, '<:raw', 'ciphertext.bin');
$in_fh = File::KDBX::IO::Crypt->new($in_fh, cipher => $cipher);
my $plaintext = do { local $/; <$in_fh> );
close($in_fh);
=head1 ATTRIBUTES
=head2 cipher
A L<File::KDBX::Cipher> instance to do the actual encryption or decryption.
=head1 METHODS
=head2 new
$fh = File::KDBX::IO::Crypt->new(%attributes);
$fh = File::KDBX::IO::Crypt->new($fh, %attributes);
Construct a new crypto IO handle.
=head1 BUGS
Please report any bugs or feature requests on the bugtracker website
L<https://github.com/chazmcgarvey/File-KDBX/issues>
When submitting a bug or request, please include a test-file or a
patch to an existing test-file that illustrates the bug or desired
feature.
=head1 AUTHOR
Charles McGarvey <ccm@cpan.org>
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2022 by Charles McGarvey.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=cut
|
