---
name: "Authen::Passphrase::LANManager"
section: "3pm"
platform: "linux"
package: "libauthen-passphrase-perl"
version: "0.008-3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Authen::Passphrase::LANManager"
---

# Authen::Passphrase::LANManager(3pm)

passphrases using the LAN Manager hash algorithm

## 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.