my $buffer_size = 1024;
my $on = 0;
while ( my $bytes_read = sysread ORGINAL, my $buffer, $buffer_size ) {
defined $bytes_read or die "Cannot sysread from $filename: $!";
syswrite ENCRYPTED, $cipher->crypt( $buffer ) or die "Cannot syswr
+ite to $filename.3nc: $!";
$on += $bytes_read;