NAME¶
Authen::Passphrase::MySQL41 - passphrases using the MySQL v4.1 algorithm
SYNOPSIS¶
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)) { ...
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.
The MySQL v4.1 hash scheme is based on the SHA-1 digest algorithm. The
passphrase is first hashed using SHA-1, then the output of that stage is
hashed using SHA-1 again. The final hash is the output of the second SHA-1. No
salt is used.
In MySQL the hash is represented as a "
*" followed by 40
uppercase hexadecimal digits.
The lack of salt is a weakness in this scheme. Salted SHA-1 is a better scheme;
see Authen::Passphrase::SaltedDigest.
CONSTRUCTOR¶
- Authen::Passphrase::MySQL41->new(ATTR => VALUE, ...)
- Generates a new passphrase recogniser object using the MySQL v4.1
algorithm. The following attributes may be given:
- hash
- The hash, as a string of 20 bytes.
- hash_hex
- The hash, as a string of 40 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 20 bytes.
- $ppr->hash_hex
- Returns the hash value, as a string of 40 uppercase hexadecimal
digits.
- $ppr->match(PASSPHRASE)
- This method is part of the standard Authen::Passphrase interface.
SEE ALSO¶
Authen::Passphrase, Digest::SHA
AUTHOR¶
Andrew Main (Zefram) <zefram@fysh.org>
COPYRIGHT¶
Copyright (C) 2006, 2007, 2009, 2010, 2012 Andrew Main (Zefram)
<zefram@fysh.org>
LICENSE¶
This module is free software; you can redistribute it and/or modify it under the
same terms as Perl itself.