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.\"
.IX Title "Authen::Passphrase::NTHash 3pm"
.TH Authen::Passphrase::NTHash 3pm "2012-02-07" "perl v5.14.2" "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::NTHash \- passphrases using the NT\-Hash algorithm
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&        use Authen::Passphrase::NTHash;
\&
\&        $ppr = Authen::Passphrase::NTHash\->new(
\&                hash_hex => "7f8fe03093cc84b267b109625f6bbf4b");
\&
\&        $ppr = Authen::Passphrase::NTHash\->new(
\&                passphrase => "passphrase");
\&
\&        $ppr = Authen::Passphrase::NTHash\->from_crypt(
\&                \*(Aq$3$$7f8fe03093cc84b267b109625f6bbf4b\*(Aq);
\&
\&        $ppr = Authen::Passphrase::NTHash\->from_rfc2307(
\&                \*(Aq{MSNT}7f8fe03093cc84b267b109625f6bbf4b\*(Aq);
\&
\&        $hash = $ppr\->hash;
\&        $hash_hex = $ppr\->hash_hex;
\&
\&        if($ppr\->match($passphrase)) { ...
\&
\&        $passwd = $ppr\->as_crypt;
\&        $userPassword = $ppr\->as_rfc2307;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
An object of this class encapsulates a passphrase hashed using the NT-Hash
function.  This is a subclass of Authen::Passphrase, and this document
assumes that the reader is familiar with the documentation for that class.
.PP
The NT-Hash scheme is based on the \s-1MD4\s0 digest algorithm.  Up to 128
characters of passphrase (characters beyond the 128th are ignored)
are represented in Unicode, and hashed using \s-1MD4\s0.  No salt is used.
.PP
\&\fIWarning:\fR \s-1MD4\s0 is a weak hash algorithm by current standards, and the
lack of salt is a design flaw in this scheme.  Use this for compatibility
only, not by choice.
.SH "CONSTRUCTORS"
.IX Header "CONSTRUCTORS"
.IP "Authen::Passphrase::NTHash\->new(\s-1ATTR\s0 => \s-1VALUE\s0, ...)" 4
.IX Item "Authen::Passphrase::NTHash->new(ATTR => VALUE, ...)"
Generates a new passphrase recogniser object using the NT-Hash algorithm.
The following attributes may be given:
.RS 4
.IP "\fBhash\fR" 4
.IX Item "hash"
The hash, as a string of 16 bytes.
.IP "\fBhash_hex\fR" 4
.IX Item "hash_hex"
The hash, as a string of 32 hexadecimal digits.
.IP "\fBpassphrase\fR" 4
.IX Item "passphrase"
A passphrase that will be accepted.
.RE
.RS 4
.Sp
Either the hash or the passphrase must be given.
.RE
.IP "Authen::Passphrase::NTHash\->from_crypt(\s-1PASSWD\s0)" 4
.IX Item "Authen::Passphrase::NTHash->from_crypt(PASSWD)"
Generates a new NT-Hash passphrase recogniser object from a crypt string.
Two forms are accepted.  In the first form, the he crypt string must
consist of "\fB\f(CB$3\fB$$\fR\*(L" (note the extra \*(R"\fB$\fR\*(L") followed by the hash in
lowercase hexadecimal.  In the second form, the he crypt string must
consist of \*(R"\fB\f(CB$NT\fB$\fR" followed by the hash in lowercase hexadecimal.
.IP "Authen::Passphrase::NTHash\->from_rfc2307(\s-1USERPASSWORD\s0)" 4
.IX Item "Authen::Passphrase::NTHash->from_rfc2307(USERPASSWORD)"
Generates a new NT-Hash passphrase recogniser object from an \s-1RFC\s0
2307 string.  Two forms are accepted.  In the first form, the string
must consist of "\fB{\s-1MSNT\s0}\fR\*(L" followed by the hash in hexadecimal; case
is ignored.  In the second form, the string must consist of \*(R"\fB{\s-1CRYPT\s0}\fR"
(case insensitive) followed by an acceptable crypt string.
.SH "METHODS"
.IX Header "METHODS"
.ie n .IP "$ppr\->hash" 4
.el .IP "\f(CW$ppr\fR\->hash" 4
.IX Item "$ppr->hash"
Returns the hash value, as a string of 16 bytes.
.ie n .IP "$ppr\->hash_hex" 4
.el .IP "\f(CW$ppr\fR\->hash_hex" 4
.IX Item "$ppr->hash_hex"
Returns the hash value, as a string of 32 hexadecimal digits.
.ie n .IP "$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,
Digest::MD4
.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.