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Re: Decrypt UNIX password

by wog (Curate)
on Nov 25, 2001 at 01:32 UTC ( #127314=note: print w/replies, xml ) Need Help??

in reply to Decrypt UNIX password

This question is answered in the IAQ, under the question "How do I decrypt a string that I encrypted with crypt()?" (since crypt generates "UNIX style passwords", usually). To quote their answer:
sub decrypt { my $c = shift; my @c = (0) x 8; for (;;) { my $i = 0; my $s = join '', map chr, @c; return $s if crypt($s, $c) eq $c; $c[$i]=0, $i++ while $c[$i] == 255; return undef if $i > 7; $c[$i]++; } }

(For the humor impaired, the IAQ is not serious; quoth crypt's docs: "Note that "crypt" is intended to be a one-way function... There is no (known) corresponding decrypt function." This functions attempts to brute force the crypt'd string and thus is extremely slow.)

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