Hola a ver si vierais el error xq yo creo que los codigos estan bien echos:
  
PERL:
#!/usr/bin/perl -w
# --
# bin/CryptPassword.pl - to crypt database password for Kernel/Config.pm 
# Copyright (C) 2001-2004 Martin Edenhofer <
[email protected]>
# --
# $Id: CryptPassword.pl,v 1.1 2004/06/22 08:01:28 martin Exp $
# --
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
# -- 
use strict; 
use vars qw($VERSION);
$VERSION = '$Revision: 1.1 $';
$VERSION =~ s/^\$.*:\W(.*)\W.+?$/$1/; 
# --
# check args
# --
my $Password = shift;
print "bin/CryptPassword.pl <Revision $VERSION> - to crypt database password for Kernel/Config.pm\n";
print "Copyright (c) 2001-2004 Martin Edenhofer <martin\@otrs.org>\n"; 
if (!$Password) {
    print STDERR "Usage: bin/CryptPassword.pl NEWPW\n";
}
else {
    my $Length = length($Password)*8;
    chomp $Password;
    # get bit code
    my $T = unpack("B$Length", $Password);
    # crypt bit code
    $T =~ s/1/A/g;
    $T =~ s/0/1/g;
    $T =~ s/A/0/g;
    # get ascii code
    $T = pack("B$Length", $T);
    # get hex code
    my $H = unpack("h$Length", $T);
    print "Crypted password: {$H}\n";
}  
ASP.NET:
	public static string encrypt(string password)
		{
			string result="";
			foreach (char c in password.ToCharArray())
				result += encode(c);
			return result;
		}
		public static string encode(char mychar)
		{
			int result = (int) mychar;
			result = (~result) & 255;			
			result = (result & 15)<<4 | (result & 240)>>4;			
			return string.Format("{0:x}", result);
		} 
pero el resultado no es el esperado xq el programa de PERL pone en la base de datos esto: prjqSmRFQBP7c 
y mi codigo saca esta: c989d8 
que falla??? 
gracias.