Authen::Passphrase::LANManager(3pm) User Contributed Perl Documentation Authen::Passphrase::LANManager(3pm)
NAME
Authen::Passphrase::LANManager - passphrases using the LAN Manager hash algorithm
SYNOPSIS
use Authen::Passphrase::LANManager;
$ppr = Authen::Passphrase::LANManager->new(
hash_hex => "855c3697d9979e78ac404c4ba2c66533");
$ppr = Authen::Passphrase::LANManager->new(
passphrase => "passphrase");
$ppr = Authen::Passphrase::LANManager->from_rfc2307(
"{LANMAN}855c3697d9979e78ac404c4ba2c66533");
$hash = $ppr->hash;
$hash_hex = $ppr->hash_hex;
$ppr0 = $ppr->first_half;
$ppr1 = $ppr->second_half;
if($ppr->match($passphrase)) { ...
$userPassword = $ppr->as_rfc2307;
DESCRIPTION
An object of this class encapsulates a passphrase hashed using the Microsoft LAN Manager hash function. This is a subclass of
Authen::Passphrase, and this document assumes that the reader is familiar with the documentation for that class.
The hash algorithm can be used on up to fourteen Latin-1 characters of passphrase. First the passphrase is folded to uppercase, and zero-
padded to fourteen bytes. Then it is split into two halves. Each seven-byte half is used as a 56-bit DES key, to encrypt the fixed
plaintext block "KGS!@#$%". The eight-byte ciphertexts are concatenated to form the sixteen-byte hash. There is no salt.
Because the two halves of the passphrase are hashed separately, it is possible to manipulate (e.g., crack) a half hash in isolation. See
Authen::Passphrase::LANManagerHalf.
Warning: Don't even think about using this seriously. It's an exceptionally weak design, flawed in pretty much every respect.
CONSTRUCTORS
Authen::Passphrase::LANManager->new(ATTR => VALUE, ...)
Generates a new passphrase recogniser object using the LAN Manager hash algorithm. The following attributes may be given:
hash
The hash, as a string of 16 bytes.
hash_hex
The hash, as a string of 32 hexadecimal digits.
passphrase
A passphrase that will be accepted.
Either the hash or the passphrase must be given.
Authen::Passphrase::LANManager->from_rfc2307(USERPASSWORD)
Generates a LAN Manager passphrase recogniser from the supplied RFC2307 encoding. The string must consist of "{LANMAN}" (or its
synonym "{LANM}") followed by the hash in hexadecimal; case is ignored.
METHODS
$ppr->hash
Returns the hash value, as a string of 16 bytes.
$ppr->hash_hex
Returns the hash value, as a string of 32 hexadecimal digits.
$ppr->first_half
Returns the hash of the first half of the passphrase, as an Authen::Passphrase::LANManagerHalf passphrase recogniser.
$ppr->second_half
Returns the hash of the second half of the passphrase, as an Authen::Passphrase::LANManagerHalf passphrase recogniser.
$ppr->match(PASSPHRASE)
$ppr->as_rfc2307
These methods are part of the standard Authen::Passphrase interface.
SEE ALSO
Authen::Passphrase, Authen::Passphrase::LANManagerHalf, Crypt::DES
AUTHOR
Andrew Main (Zefram) <zefram@fysh.org>
COPYRIGHT
Copyright (C) 2006, 2007, 2009, 2010, 2012 Andrew Main (Zefram) <zefram@fysh.org>
LICENSE
This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
perl v5.14.2 2012-02-07 Authen::Passphrase::LANManager(3pm)