NAME

Authen::Passphrase::NTHash - passphrases using the NT-Hash algorithm

SYNOPSIS

use Authen::Passphrase::NTHash;

$ppr = Authen::Passphrase::NTHash->new(
	hash_hex => "7f8fe03093cc84b267b109625f6bbf4b");

$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 a passphrase hashed using the NT-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 NT-Hash scheme is based on the MD4 digest algorithm. Up to 128 characters of passphrase (characters beyond the 128th are ignored) are represented in Unicode, and hashed using MD4. No salt is used.

Warning: MD4 is a weak hash algorithm by current standards, and the lack of salt is a design flaw in this scheme. Use this for compatibility only, not by choice.

CONSTRUCTOR

Authen::Passphrase::NTHash->new(ATTR => VALUE, ...)

Generates a new passphrase recogniser object using the NT-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.

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->match(PASSPHRASE)

$ppr->as_crypt

$ppr->as_rfc2307

These methods are part of the standard Authen::Passphrase interface.

SEE ALSO

Authen::Passphrase, Digest::MD4

AUTHOR

Andrew Main (Zefram) <zefram@fysh.org>

COPYRIGHT

Copyright (C) 2006 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.