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.\" ========================================================================
.\"
.IX Title "Authen::Passphrase::MySQL323 3pm"
.TH Authen::Passphrase::MySQL323 3pm "2022-06-08" "perl v5.34.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Authen::Passphrase::MySQL323 \- passphrases using the MySQL v3.23 algorithm
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&        use Authen::Passphrase::MySQL323;
\&
\&        $ppr = Authen::Passphrase::MySQL323\->new(
\&                hash_hex => "2af8a0a82c8f9086");
\&
\&        $ppr = Authen::Passphrase::MySQL323\->new(
\&                passphrase => "passphrase");
\&
\&        $hash = $ppr\->hash;
\&        $hash_hex = $ppr\->hash_hex;
\&
\&        if($ppr\->match($passphrase)) { ...
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
An object of this class encapsulates a passphrase hashed using the
algorithm used by MySQL from version 3.23.  This is a subclass of
Authen::Passphrase, and this document assumes that the reader is
familiar with the documentation for that class.
.PP
The MySQL v3.23 hash scheme is composed entirely of linear operations.
It accepts an arbitrarily long passphrase, and ignores all space
and tab characters.  No salt is used.  62 bits of hash are generated.
Each character influences only a minority of the result bits, so similar
passphrases of the same length have noticeably similar hashes.
.PP
In MySQL the hash is represented as a string of sixteen lowercase
hexadecimal digits.
.PP
\&\fIWarning:\fR This is not a serious cryptographic algorithm.  Do not use
for any security purpose.
.SH "CONSTRUCTOR"
.IX Header "CONSTRUCTOR"
.IP "Authen::Passphrase::MySQL323\->new(\s-1ATTR\s0 => \s-1VALUE, ...\s0)" 4
.IX Item "Authen::Passphrase::MySQL323->new(ATTR => VALUE, ...)"
Generates a new passphrase recogniser object using the MySQL v3.23
algorithm.  The following attributes may be given:
.RS 4
.IP "\fBhash\fR" 4
.IX Item "hash"
The hash, as a string of eight bytes.  The first and fifth bytes must
have their top bit clear.
.IP "\fBhash_hex\fR" 4
.IX Item "hash_hex"
The hash, as a string of 16 hexadecimal digits.
.IP "\fBpassphrase\fR" 4
.IX Item "passphrase"
A passphrase that will be accepted.
.RE
.RS 4
.Sp
Either the hash or the passphrase must be given.
.RE
.SH "METHODS"
.IX Header "METHODS"
.ie n .IP "$ppr\->hash" 4
.el .IP "\f(CW$ppr\fR\->hash" 4
.IX Item "$ppr->hash"
Returns the hash value, as a string of eight 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)"
This method is part of the standard Authen::Passphrase interface.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Authen::Passphrase,
Crypt::MySQL
.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.