Authen::Passphrase::PHPass(3pm)

1Authen::Passphrase::PHPUassesr(3C)ontributed Perl DocumeAnuttahteino:n:Passphrase::PHPass(3)
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NAME

6       Authen::Passphrase::PHPass - passphrases using the phpass algorithm
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SYNOPSIS

9               use Authen::Passphrase::PHPass;
10
11               $ppr = Authen::Passphrase::PHPass->new(
12                       cost => 10, salt => "NaClNaCl",
13                       hash_base64 => "ObRxTm/.EiiYN02xUeAQs/");
14
15               $ppr = Authen::Passphrase::PHPass->new(
16                       cost => 10, salt_random => 1,
17                       passphrase => "passphrase");
18
19               $ppr = Authen::Passphrase::PHPass->from_crypt(
20                       '$P$8NaClNaClObRxTm/.EiiYN02xUeAQs/');
21
22               $ppr = Authen::Passphrase::PHPass->from_rfc2307(
23                       '{CRYPT}$P$8NaClNaClObRxTm/.EiiYN02xUeAQs/');
24
25               $cost = $ppr->cost;
26               $cost_base64 = $ppr->cost_base64;
27               $cost = $ppr->nrounds_log2;
28               $cost_base64 = $ppr->nrounds_log2_base64;
29               $salt = $ppr->salt;
30               $hash = $ppr->hash;
31               $hash_base64 = $ppr->hash_base64;
32
33               if($ppr->match($passphrase)) { ...
34
35               $passwd = $ppr->as_crypt;
36               $userPassword = $ppr->as_rfc2307;
37

DESCRIPTION

39       An object of this class encapsulates a passphrase hashed using the
40       phpass algorithm invented by Solar Designer and described at
41       <http://www.openwall.com/phpass/>.  This is a subclass of
42       Authen::Passphrase, and this document assumes that the reader is
43       familiar with the documentation for that class.
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45       The phpass algorithm is based on the MD5 message digest algorithm.
46       There is an eight-byte salt, which is conventionally restricted to
47       consist of base 64 digits.  There is also a cost parameter that
48       controls the expense of hashing.  First the salt and passphrase are
49       concatenated and hashed by MD5.  Then, 2^cost times, the hash from the
50       previous stage is concatenated with the passphrase and hashed by MD5.
51       The passphrase hash is the output from the final iteration.
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53       The passphrase hash is represented in ASCII using the crypt format with
54       prefix "$P$".  The first character after the format prefix is a base 64
55       digit giving the cost parameter.  The next eight characters are the
56       salt.  The salt is followed by 22 base 64 digits giving the hash.  The
57       base 64 digits are ".", "/", "0" to "9", "A" to "Z", "a" to "z" (in
58       ASCII order).
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CONSTRUCTORS

61       Authen::Passphrase::PHPass->new(ATTR => VALUE, ...)
62           Generates a new passphrase recogniser object using the phpass
63           algorithm.  The following attributes may be given:
64
65           cost
66               Base-two logarithm of the number of hashing rounds to perform.
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68           cost_base64
69               Base-two logarithm of the number of hashing rounds to perform,
70               expressed as a single base 64 digit.
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72           nrounds_log2
73               Synonym for cost.
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75           nrounds_log2_base64
76               Synonym for cost_base64.
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78           salt
79               The salt, as an eight-byte string.
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81           salt_random
82               Causes salt to be generated randomly.  The value given for this
83               attribute is ignored.  The salt will be a string of eight base
84               64 digits.  The source of randomness may be controlled by the
85               facility described in Data::Entropy.
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87           hash
88               The hash, as a 16-byte string.
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90           hash_base64
91               The hash, as a string of 22 base 64 digits.
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93           passphrase
94               A passphrase that will be accepted.
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96           The cost and salt must be given, and either the hash or the
97           passphrase.
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99       Authen::Passphrase::PHPass->from_crypt(PASSWD)
100           Generates a new phpass passphrase recogniser object from a crypt
101           string.  The crypt string must consist of "$P$", one base 64
102           character encoding the cost, the salt, then 22 base 64 digits
103           giving the hash.  The salt must be exactly 8 characters long, and
104           cannot contain any character that cannot appear in a crypt string.
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106       Authen::Passphrase::PHPass->from_rfc2307(USERPASSWORD)
107           Generates a new phpass passphrase recogniser object from an RFC
108           2307 string.  The string must consist of "{CRYPT}" (case
109           insensitive) followed by an acceptable crypt string.
110

METHODS

112       $ppr->cost
113           Returns the base-two logarithm of the number of hashing rounds that
114           will be performed.
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116       $ppr->cost_base64
117           Returns the base-two logarithm of the number of hashing rounds that
118           will be performed, expressed as a single base 64 digit.
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120       $ppr->nrounds_log2
121           Synonym for "cost".
122
123       $ppr->nrounds_log2_base64
124           Synonym for "cost_base64".
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126       $ppr->salt
127           Returns the salt, as a string of eight bytes.
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129       $ppr->hash
130           Returns the hash value, as a string of 16 bytes.
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132       $ppr->hash_base64
133           Returns the hash value, as a string of 22 base 64 digits.
134
135       $ppr->match(PASSPHRASE)
136       $ppr->as_crypt
137       $ppr->as_rfc2307
138           These methods are part of the standard Authen::Passphrase
139           interface.
140

AUTHOR

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

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

152       This module is free software; you can redistribute it and/or modify it
153       under the same terms as Perl itself.
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157perl v5.34.0                      2021-07-22     Authen::Passphrase::PHPass(3)