NAME

Authen::Passphrase::MySQL323 - passphrases using the MySQL v3.23 algorithm

SYNOPSIS

        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)) { ...

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.

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.

In MySQL the hash is represented as a string of sixteen lowercase hexadecimal digits.

Warning: This is not a serious cryptographic algorithm. Do not use for any security purpose.

CONSTRUCTOR

Authen::Passphrase::MySQL323->new(ATTR => VALUE, ...): Generates a new passphrase recogniser object using the MySQL v3.23 algorithm. The following attributes may be given:

hash: The hash, as a string of eight bytes. The first and fifth bytes must have their top bit clear.
hash_hex: The hash, as a string of 16 hexadecimal digits.
passphrase: A passphrase that will be accepted.

Either the hash or the passphrase must be given.

METHODS

$ppr->hash: Returns the hash value, as a string of eight bytes.
$ppr->hash_hex: Returns the hash value, as a string of 16 hexadecimal digits.
$ppr->match(PASSPHRASE): This method is part of the standard Authen::Passphrase interface.

AUTHOR

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

COPYRIGHT

LICENSE

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.