my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
		$atime,$mtime,$ctime,$blksize,$blocks) = stat $s_pdf_to_sign;
open FILE, "<$s_pdf_to_sign" or die "no such file";
binmode FILE;
my $s_pdf_to_sign_string;
read FILE, $s_pdf_to_sign_string, $size;
close FILE;