debian man page for authen::passphrase::mysql41

Authen::Passphrase::MySQL41(3pm)			User Contributed Perl Documentation			  Authen::Passphrase::MySQL41(3pm)

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.

perl v5.14.2							    2012-02-07					  Authen::Passphrase::MySQL41(3pm)