1Authen::Passphrase::MySUQsLe4r1(C3o)ntributed Perl DocumAeuntthaetni:o:nPassphrase::MySQL41(3)
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NAME

6       Authen::Passphrase::MySQL41 - passphrases using the MySQL v4.1
7       algorithm
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SYNOPSIS

10               use Authen::Passphrase::MySQL41;
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12               $ppr = Authen::Passphrase::MySQL41->new(
13                       hash_hex => "9CD12C48C4C5DD62914B".
14                                   "3FABB93131746E9E9115");
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16               $ppr = Authen::Passphrase::MySQL41->new(
17                       passphrase => "passphrase");
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19               $hash = $ppr->hash;
20               $hash_hex = $ppr->hash_hex;
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22               if($ppr->match($passphrase)) { ...
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DESCRIPTION

25       An object of this class encapsulates a passphrase hashed using the
26       algorithm used by MySQL from version 4.1.  This is a subclass of
27       Authen::Passphrase, and this document assumes that the reader is
28       familiar with the documentation for that class.
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30       The MySQL v4.1 hash scheme is based on the SHA-1 digest algorithm.  The
31       passphrase is first hashed using SHA-1, then the output of that stage
32       is hashed using SHA-1 again.  The final hash is the output of the
33       second SHA-1.  No salt is used.
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35       In MySQL the hash is represented as a "*" followed by 40 uppercase
36       hexadecimal digits.
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38       The lack of salt is a weakness in this scheme.  Salted SHA-1 is a
39       better scheme; see Authen::Passphrase::SaltedDigest.
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CONSTRUCTOR

42       Authen::Passphrase::MySQL41->new(ATTR => VALUE, ...)
43           Generates a new passphrase recogniser object using the MySQL v4.1
44           algorithm.  The following attributes may be given:
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46           hash
47               The hash, as a string of 20 bytes.
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49           hash_hex
50               The hash, as a string of 40 hexadecimal digits.
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52           passphrase
53               A passphrase that will be accepted.
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55           Either the hash or the passphrase must be given.
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METHODS

58       $ppr->hash
59           Returns the hash value, as a string of 20 bytes.
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61       $ppr->hash_hex
62           Returns the hash value, as a string of 40 uppercase hexadecimal
63           digits.
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65       $ppr->match(PASSPHRASE)
66           This method is part of the standard Authen::Passphrase interface.
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SEE ALSO

69       Authen::Passphrase, Digest::SHA
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AUTHOR

72       Andrew Main (Zefram) <zefram@fysh.org>
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75       Copyright (C) 2006, 2007, 2009, 2010, 2012 Andrew Main (Zefram)
76       <zefram@fysh.org>
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LICENSE

79       This module is free software; you can redistribute it and/or modify it
80       under the same terms as Perl itself.
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84perl v5.34.0                      2022-01-20    Authen::Passphrase::MySQL41(3)
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