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package SL::Auth::Password;

use strict;

use Carp;

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

if (!$params{algorithm}) {
$params{algorithm} = 'SHA1';
$params{fallback_algorithm} = 'MD5';
}

if ($params{algorithm} eq 'SHA1') {
if (eval { require Digest::SHA1; 1 }) {
return '{SHA1}' . Digest::SHA1::sha1_hex($params{password});

} elsif ($params{fallback_algorithm}) {
return $class->hash_password(%params, algorithm => $params{fallback_algorithm});

} else {
die 'Digest::SHA1 not available';
}

} elsif ($params{algorithm} eq 'MD5') {
require Digest::MD5;
return '{MD5}' . Digest::MD5::md5_hex($params{password});

} elsif ($params{algorithm} eq 'CRYPT') {
return '{CRYPT}' . crypt($params{password}, substr($params{login}, 0, 2));

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

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

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

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);
}

sub parse {
my ($class, $password, $default_algorithm) = @_;

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

1;
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