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package SL::Auth::Password;

use strict;

use Carp;
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use Digest::MD5 ();
use Digest::SHA ();
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sub hash {
my ($class, %params) = @_;

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$params{algorithm} ||= 'SHA256S';
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my $salt = $params{algorithm} =~ m/S$/ ? $params{login} : '';

if ($params{algorithm} =~ m/^SHA256/) {
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return '{' . $params{algorithm} . '}' . Digest::SHA::sha256_hex($salt . $params{password});
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} elsif ($params{algorithm} =~ m/^SHA1/) {
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return '{' . $params{algorithm} . '}' . Digest::SHA::sha1_hex($salt . $params{password});
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} elsif ($params{algorithm} =~ m/^MD5/) {
return '{' . $params{algorithm} . '}' . Digest::MD5::md5_hex($salt . $params{password});
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} elsif ($params{algorithm} eq 'CRYPT') {
return '{CRYPT}' . crypt($params{password}, substr($params{login}, 0, 2));

} else {
croak 'Unsupported hash algorithm ' . $params{algorithm};
}
}

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sub hash_if_unhashed {
my ($class, %params) = @_;

my ($algorithm, $password) = $class->parse($params{password}, 'NONE');

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return $params{password} unless $algorithm eq 'NONE';

if ($params{look_up_algorithm}) {
my $stored_password = $params{auth}->get_stored_password($params{login});
my ($stored_algorithm) = $class->parse($stored_password);
$params{algorithm} = $stored_algorithm;
}

return $class->hash(%params);
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}

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sub parse {
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my ($class, $password, $default_algorithm) = @_;
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return ($1, $2) if $password =~ m/^\{ ([^\}]+) \} (.+)/x;
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return ($default_algorithm || 'CRYPT', $password);
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}

1;