the simple workaround is write it to a file, load, then erase the file.
require 'format/printf' lockedV =: 2 : 0 a =. m sprintf boxopen n (3!:6 ] a) 1!:2 fl =. < jpath '~temp\filet.ijl' 0!:0 fl 1!:55 fl ) HashSalter =: 'SaltedHash_hashes_ =: ''sha256'' gethash ''%j'' , ]' lockedV The above does something fancier than that. lockedV uses a template, and binds another parameter to it. HashSalter is an adverb (template bound to conjunction), and the locked verb result (SaltedHash_hashes_) when bound with a parameter is a secret hash function. ----- Original Message ----- From: Raul Miller <[email protected]> To: Programming forum <[email protected]> Cc: Sent: Thursday, October 22, 2015 7:01 PM Subject: Re: [Jprogramming] Executing Locked Scripts from Nouns I guess I didn't go looking for the locked script support. Of course, you could also implement something in user space. For example: ode=: (&.((8#2)&#:))(&.(a.&i.)) enc=: (_8 ]\[)@,@|:ode dec=: |:@($~ 8,#%8:)@,ode enc dec 'sum=:+/' sum=:+/ More elaborate possibilities exist, and of course anyone with access to the machine and a basic understanding of machine language can just grab the decoded memory image without bothering to figure out how the algorithm works. Thanks, -- Raul On Thu, Oct 22, 2015 at 4:42 PM, Eric Iverson <[email protected]> wrote: > I suggest reading the file when you have access and then using a temp > file later on when you need to load it. This is an adequate workaround > to what has always been a kludgey area. > > It is unlikely that Jsoftware has interest in 'bug fixes' in this > particular area. > > We will likely, by year end, do a new official GPL release of J that > will be intended for broader use (and feedback to us). One change we > will make is that we will distribute the source file that implements > our official release lock/unlock mechanism. > > This change will be accompanied by doc changes that state that locked > files are not very secure (never were and will be even less so). > Locking a file is an indication that the J source in the file is > proprietary and that nice users will respect that and not pry. And > nasty users are just nasty. > > > On Thu, Oct 22, 2015 at 12:40 PM, Thomas Costigliola <[email protected]> > wrote: >> Attempting to run a locked script from a noun doesn't work: >> >> 0!:1]3!:6 'sum=:+/' >> >> � >> >> |spelling error >> >> | � >> >> >> I understand there might not have been an apparent use case for this, but >> is there a technical or security reason for the restriction? >> >> >> I need to read the contents of a locked script into a noun but not execute >> it until a later time at which the file will no longer be accessible. This >> seems easy to implement in the interpreter, but I was wondering if there >> was something I am overlooking that makes it difficult or undesirable. >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
