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Authen::Passphrase::LANManagerHalf.3pm
Langue: en
Version: 2007-01-21 (ubuntu - 07/07/09)
Section: 3 (Bibliothèques de fonctions)
NAME
Authen::Passphrase::LANManagerHalf - passphrases using half the LAN Manager algorithmSYNOPSIS
use Authen::Passphrase::LANManagerHalf; $ppr = Authen::Passphrase::LANManagerHalf->new( hash_hex => "855c3697d9979e78"); $ppr = Authen::Passphrase::LANManagerHalf->new( passphrase => "passphr"); $ppr = Authen::Passphrase::LANManagerHalf->from_crypt( '$LM$855c3697d9979e78'); $ppr = Authen::Passphrase::LANManagerHalf->from_rfc2307( '{CRYPT}$LM$855c3697d9979e78'); $hash = $ppr->hash; $hash_hex = $ppr->hash_hex; if($ppr->match($passphrase)) { ... $passwd = $ppr->as_crypt; $userPassword = $ppr->as_rfc2307;
DESCRIPTION
An object of this class encapsulates half of a passphrase hashed using the Microsoft LAN Manager hash function. This is a subclass of "Authen::Passphrase", and this document assumes that the reader is familiar with the documentation for that class. For the complete LAN Manager hash function, see Authen::Passphrase::LANManager.In a spectacularly bad design decision, the Microsoft LAN Manager hash function splits the passphrase into two parts and hashes them separately. It is therefore possible to separate the halves of a LAN Manager hash, and do things with them (such as crack them) separately. This class is about using such a hash half on its own.
The half hash algorithm can be used on up to seven Latin-1 characters of passphrase. First the passphrase is folded to uppercase, and zero-padded to seven bytes. Then the seven bytes are used as a 56-bit DES key, to encrypt the fixed plaintext block ``KGS!@#$%''. The eight byte ciphertext block is the half hash. There is no salt.
Warning: Don't even think about using this seriously. It's an exceptionally weak design, flawed in pretty much every respect.
CONSTRUCTORS
- Authen::Passphrase::LANManagerHalf->new(ATTR => VALUE, ...)
- Generates a new passphrase recogniser object using the LAN Manager half hash algorithm. The following attributes may be given:
-
- hash
- The hash, as a string of 8 bytes.
- hash_hex
- The hash, as a string of 16 hexadecimal digits.
- passphrase
- A passphrase that will be accepted.
Either the hash or the passphrase must be given.
-
- Authen::Passphrase::LANManagerHalf->from_crypt(PASSWD)
- Generates a new LAN Manager half passphrase recogniser object from a crypt string. The crypt string must consist of "$LM$" followed by the hash in lowercase hexadecimal.
- Authen::Passphrase::LANManagerHalf->from_rfc2307(USERPASSWORD)
- Generates a new LAN Manager half passphrase recogniser object from an RFC 2307 string. The string must consist of "{CRYPT}" (case insensitive) followed by an acceptable crypt string.
METHODS
- $ppr->hash
- Returns the hash value, as a string of 8 bytes.
- $ppr->hash_hex
- Returns the hash value, as a string of 16 hexadecimal digits.
- $ppr->match(PASSPHRASE)
- $ppr->as_crypt
- $ppr->as_rfc2307
- These methods are part of the standard "Authen::Passphrase" interface.
SEE ALSO
Authen::Passphrase, Authen::Passphrase::LANManager, Crypt::DESAUTHOR
Andrew Main (Zefram) <zefram@fysh.org>COPYRIGHT
Copyright (C) 2006, 2007 Andrew Main (Zefram) <zefram@fysh.org>This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre