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.\"
.IX Title "Authen::Passphrase::LANManagerHalf 3pm"
.TH Authen::Passphrase::LANManagerHalf 3pm "2015-06-06" "perl v5.20.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
Authen::Passphrase::LANManagerHalf \- passphrases using half the LAN
Manager algorithm
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&        use Authen::Passphrase::LANManagerHalf;
\&
\&        $ppr = Authen::Passphrase::LANManagerHalf\->new(
\&                hash_hex => "855c3697d9979e78");
\&
\&        $ppr = Authen::Passphrase::LANManagerHalf\->new(
\&                passphrase => "passphr");
\&
\&        $ppr = Authen::Passphrase::LANManagerHalf\->from_crypt(
\&                \*(Aq$LM$855c3697d9979e78\*(Aq);
\&
\&        $ppr = Authen::Passphrase::LANManagerHalf\->from_rfc2307(
\&                \*(Aq{CRYPT}$LM$855c3697d9979e78\*(Aq);
\&
\&        $hash = $ppr\->hash;
\&        $hash_hex = $ppr\->hash_hex;
\&
\&        if($ppr\->match($passphrase)) { ...
\&
\&        $passwd = $ppr\->as_crypt;
\&        $userPassword = $ppr\->as_rfc2307;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
An object of this class encapsulates half of a passphrase hashed
using the Microsoft \s-1LAN\s0 Manager hash function.  This is a subclass of
Authen::Passphrase, and this document assumes that the reader is
familiar with the documentation for that class.  For the complete \s-1LAN\s0
Manager hash function, see Authen::Passphrase::LANManager.
.PP
In a spectacularly bad design decision, the Microsoft \s-1LAN\s0 Manager hash
function splits the passphrase into two parts and hashes them separately.
It is therefore possible to separate the halves of a \s-1LAN\s0 Manager hash,
and do things with them (such as crack them) separately.  This class is
about using such a hash half on its own.
.PP
The half hash algorithm can be used on up to seven Latin\-1 characters of
passphrase.  First the passphrase is folded to uppercase, and zero-padded
to seven bytes.  Then the seven bytes are used as a 56\-bit \s-1DES\s0 key, to
encrypt the fixed plaintext block \*(L"\s-1KGS\s0!@#$%\*(R".  The eight byte ciphertext
block is the half hash.  There is no salt.
.PP
\&\fIWarning:\fR Don't even think about using this seriously.  It's an
exceptionally weak design, flawed in pretty much every respect.
.SH "CONSTRUCTORS"
.IX Header "CONSTRUCTORS"
.IP "Authen::Passphrase::LANManagerHalf\->new(\s-1ATTR\s0 => \s-1VALUE, ...\s0)" 4
.IX Item "Authen::Passphrase::LANManagerHalf->new(ATTR => VALUE, ...)"
Generates a new passphrase recogniser object using the \s-1LAN\s0 Manager half
hash algorithm.  The following attributes may be given:
.RS 4
.IP "\fBhash\fR" 4
.IX Item "hash"
The hash, as a string of 8 bytes.
.IP "\fBhash_hex\fR" 4
.IX Item "hash_hex"
The hash, as a string of 16 hexadecimal digits.
.IP "\fBpassphrase\fR" 4
.IX Item "passphrase"
A passphrase that will be accepted.
.RE
.RS 4
.Sp
Either the hash or the passphrase must be given.
.RE
.IP "Authen::Passphrase::LANManagerHalf\->from_crypt(\s-1PASSWD\s0)" 4
.IX Item "Authen::Passphrase::LANManagerHalf->from_crypt(PASSWD)"
Generates a new \s-1LAN\s0 Manager half passphrase recogniser object from a
crypt string.  The crypt string must consist of "\fB\f(CB$LM\fB$\fR" followed by
the hash in lowercase hexadecimal.
.IP "Authen::Passphrase::LANManagerHalf\->from_rfc2307(\s-1USERPASSWORD\s0)" 4
.IX Item "Authen::Passphrase::LANManagerHalf->from_rfc2307(USERPASSWORD)"
Generates a new \s-1LAN\s0 Manager half passphrase recogniser object from an \s-1RFC
2307\s0 string.  The string must consist of "\fB{\s-1CRYPT\s0}\fR" (case insensitive)
followed by an acceptable crypt string.
.SH "METHODS"
.IX Header "METHODS"
.ie n .IP "$ppr\->hash" 4
.el .IP "\f(CW$ppr\fR\->hash" 4
.IX Item "$ppr->hash"
Returns the hash value, as a string of 8 bytes.
.ie n .IP "$ppr\->hash_hex" 4
.el .IP "\f(CW$ppr\fR\->hash_hex" 4
.IX Item "$ppr->hash_hex"
Returns the hash value, as a string of 16 hexadecimal digits.
.ie n .IP "$ppr\->match(\s-1PASSPHRASE\s0)" 4
.el .IP "\f(CW$ppr\fR\->match(\s-1PASSPHRASE\s0)" 4
.IX Item "$ppr->match(PASSPHRASE)"
.PD 0
.ie n .IP "$ppr\->as_crypt" 4
.el .IP "\f(CW$ppr\fR\->as_crypt" 4
.IX Item "$ppr->as_crypt"
.ie n .IP "$ppr\->as_rfc2307" 4
.el .IP "\f(CW$ppr\fR\->as_rfc2307" 4
.IX Item "$ppr->as_rfc2307"
.PD
These methods are part of the standard Authen::Passphrase interface.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Authen::Passphrase,
Authen::Passphrase::LANManager,
Crypt::DES
.SH "AUTHOR"
.IX Header "AUTHOR"
Andrew Main (Zefram) <zefram@fysh.org>
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (C) 2006, 2007, 2009, 2010, 2012
Andrew Main (Zefram) <zefram@fysh.org>
.SH "LICENSE"
.IX Header "LICENSE"
This module is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.