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.\"
.IX Title "Authen::Passphrase::MySQL41 3pm"
.TH Authen::Passphrase::MySQL41 3pm "2022-06-08" "perl v5.34.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
Authen::Passphrase::MySQL41 \- passphrases using the MySQL v4.1 algorithm
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&        use Authen::Passphrase::MySQL41;
\&
\&        $ppr = Authen::Passphrase::MySQL41\->new(
\&                hash_hex => "9CD12C48C4C5DD62914B".
\&                            "3FABB93131746E9E9115");
\&
\&        $ppr = Authen::Passphrase::MySQL41\->new(
\&                passphrase => "passphrase");
\&
\&        $hash = $ppr\->hash;
\&        $hash_hex = $ppr\->hash_hex;
\&
\&        if($ppr\->match($passphrase)) { ...
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
An object of this class encapsulates a passphrase hashed using the
algorithm used by MySQL from version 4.1.  This is a subclass of
Authen::Passphrase, and this document assumes that the reader is
familiar with the documentation for that class.
.PP
The MySQL v4.1 hash scheme is based on the \s-1SHA\-1\s0 digest algorithm.
The passphrase is first hashed using \s-1SHA\-1,\s0 then the output of that
stage is hashed using \s-1SHA\-1\s0 again.  The final hash is the output of the
second \s-1SHA\-1.\s0  No salt is used.
.PP
In MySQL the hash is represented as a "\fB*\fR" followed by 40 uppercase
hexadecimal digits.
.PP
The lack of salt is a weakness in this scheme.  Salted \s-1SHA\-1\s0 is a better
scheme; see Authen::Passphrase::SaltedDigest.
.SH "CONSTRUCTOR"
.IX Header "CONSTRUCTOR"
.IP "Authen::Passphrase::MySQL41\->new(\s-1ATTR\s0 => \s-1VALUE, ...\s0)" 4
.IX Item "Authen::Passphrase::MySQL41->new(ATTR => VALUE, ...)"
Generates a new passphrase recogniser object using the MySQL v4.1
algorithm.  The following attributes may be given:
.RS 4
.IP "\fBhash\fR" 4
.IX Item "hash"
The hash, as a string of 20 bytes.
.IP "\fBhash_hex\fR" 4
.IX Item "hash_hex"
The hash, as a string of 40 hexadecimal digits.
.IP "\fBpassphrase\fR" 4
.IX Item "passphrase"
A passphrase that will be accepted.
.RE
.RS 4
.Sp
Either the hash or the passphrase must be given.
.RE
.SH "METHODS"
.IX Header "METHODS"
.ie n .IP "$ppr\->hash" 4
.el .IP "\f(CW$ppr\fR\->hash" 4
.IX Item "$ppr->hash"
Returns the hash value, as a string of 20 bytes.
.ie n .IP "$ppr\->hash_hex" 4
.el .IP "\f(CW$ppr\fR\->hash_hex" 4
.IX Item "$ppr->hash_hex"
Returns the hash value, as a string of 40 uppercase hexadecimal digits.
.ie n .IP "$ppr\->match(\s-1PASSPHRASE\s0)" 4
.el .IP "\f(CW$ppr\fR\->match(\s-1PASSPHRASE\s0)" 4
.IX Item "$ppr->match(PASSPHRASE)"
This method is part of the standard Authen::Passphrase interface.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Authen::Passphrase,
Digest::SHA
.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.