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Authen::Passphrase::LANManager

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 AT fysh DOT org>

COPYRIGHT

Copyright (C) 2006, 2007, 2009, 2010, 2012 Andrew Main (Zefram) <zefram AT fysh DOT org>

LICENSE

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

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