in reply to Undocumented Operator Japh

Clever! liverpole++

Here's a crack at deobfuscating it:

<Reveal this spoiler or all in this thread>

Update: Cleared up the "obfuscated deobfuscation" as noted by ysth, though the original test was written to most closely resemble (from at least my point of view) the original obfuscated code. Apologies for any confusion. Also added a little extra explanation (with reference to associated documentation).



--chargrill 
s**lil*;  $*=join'',sort split q**;  s;.*;grr; &&s+(.(.)).+$2$1+; $; =
qq-$_-;s,.*,ahc,;$,.=chop for split q,,,reverse;print for($,,$;,$*,$/)

[download]

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Re^2: Undocumented Operator Japh
by liverpole (Monsignor) on Nov 22, 2006 at 12:59 UTC
    Nicely done, chargrill, as always++

    One of the fun parts of creating the obfuscation was writing the subroutine to "decrement" a word (eg. "Jus"-- => "Jur").

    It wasn't clear initially clear how many "increments" I was going to want to make, and if it turned out to be more than a few (as it certainly did), I needed to a subroutine to do it.

    This was what I ended up with: 

    sub decrement_word {
    my ($pword) = @_;
    my @vals = map { ord $_ } (split //, $$pword);
    my $idx = $#vals;
    while (1) {
        if ($vals[$idx] != ord('a') and $vals[$idx] != ord('A')) {
            --$vals[$idx];
            last;
        }
        if (0 == $idx) {
            shift @vals;
            last;
        }
        $vals[$idx] += 25;
        --$idx;
    }
    my $word = join '', map { chr } @vals;
    $$pword = $word;
}

    [download]

    It's too bad, I think, that a word "decrement" isn't part of the Perl language, at least for the obfuscatory potential it would provide. ;-)

    s''(q.S:$/9=(T1';s;(..)(..);$..=substr+crypt($1,$2),2,3;eg;print$..$/
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[d/l]
Re^2: Undocumented Operator Japh
by ysth (Canon) on Nov 22, 2006 at 01:09 UTC
[reply]
[d/l]

In Section Obfuscated Code