use Crypt::Digest qw(digest_data);
use File::KDBX::Constants qw(:cipher :random_stream);
use File::KDBX::Error;
+use File::KDBX::Util qw(:class);
+use Scalar::Util qw(blessed);
use Module::Load;
use namespace::clean;
-use parent 'File::KDBX::Cipher';
+extends 'File::KDBX::Cipher';
our $VERSION = '999.999'; # VERSION
+=attr counter
+
+ $counter = $cipher->counter;
+
+Get the initial counter / block count into the keystream.
+
+=attr offset
+
+ $offset = $cipher->offset;
+
+Get the initial byte offset into the keystream. This has precedence over L</counter> if both are set.
+
+=cut
+
+has 'counter', is => 'ro', default => 0;
+has 'offset', is => 'ro';
+sub key_size { { Salsa20 => 32, ChaCha => 32 }->{$_[0]->{algorithm} || ''} // 0 }
+sub iv_size { { Salsa20 => 8, ChaCha => 12 }->{$_[0]->{algorithm} || ''} // -1 }
+sub block_size { 1 }
+
sub init {
my $self = shift;
my %args = @_;
return $self;
}
+=method crypt
+
+ $ciphertext = $cipher->crypt($plaintext);
+ $plaintext = $cipher->crypt($ciphertext);
+
+Encrypt or decrypt some data. These ciphers are symmetric, so encryption and decryption are the same
+operation. This method is an alias for both L<File::KDBX::Cipher/encrypt> and L<File::KDBX::Cipher/decrypt>.
+
+=cut
+
sub crypt {
my $self = shift;
my $stream = $self->_stream;
return join('', map { $stream->crypt(ref $_ ? $$_ : $_) } grep { defined } @_);
}
+=method keystream
+
+ $stream = $cipher->keystream;
+
+Access the keystream.
+
+=cut
+
sub keystream {
my $self = shift;
return $self->_stream->keystream(@_);
}
+=method dup
+
+ $cipher_copy = $cipher->dup(%attributes);
+
+Get a copy of an existing cipher with the counter reset, optionally applying new attributes.
+
+=cut
+
sub dup {
- my $self = shift;
- my $dup = File::KDBX::Cipher->new(
- stream_id => $self->stream_id,
- key => $self->key,
- @_,
- );
- $dup->{key} = $self->key;
- $dup->{iv} = $self->iv;
- # FIXME - probably turn this into a proper clone method
+ my $self = shift;
+ my $class = blessed($self);
+
+ my $dup = bless {%$self, @_}, $class;
+ delete $dup->{stream};
return $dup;
}
$counter = int($offset / 64);
$pos = $offset % 64;
}
+ load $pkg;
my $s = $pkg->new($self->key, $self->iv, $counter);
# seek to correct position within block
$s->keystream($pos) if $pos;
if (my $err = $@) {
throw 'Failed to initialize stream cipher library',
error => $err,
- algorithm => $self->algorithm,
+ algorithm => $self->{algorithm},
key_length => length($self->key),
iv_length => length($self->iv),
iv => unpack('H*', $self->iv),
sub finish { delete $_[0]->{stream}; '' }
-sub counter { $_[0]->{counter} // 0 }
-sub offset { $_[0]->{offset} }
-
-=attr algorithm
-
-Get the stream cipher algorithm. Can be one of C<Salsa20> and C<ChaCha>.
-
-=cut
-
-sub algorithm { $_[0]->{algorithm} or throw 'Stream cipher algorithm is not set' }
-sub key_size { { Salsa20 => 32, ChaCha => 32 }->{$_[0]->{algorithm} || ''} // 0 }
-sub iv_size { { Salsa20 => 8, ChaCha => 12 }->{$_[0]->{algorithm} || ''} // -1 }
-sub block_size { 1 }
-
1;
__END__