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=head1 NAME |
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Deliantra::Util - utility cruft |
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=head1 SYNOPSIS |
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use Deliantra::Util; |
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=head1 DESCRIPTION |
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Various utilities that come in handy when dealing with Deliantra. |
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=over 4 |
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=cut |
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package Deliantra::Util; |
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use common::sense; |
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use Digest::SHA; |
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# helepr function to wrok around bugs in Digest::SHA |
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sub dgst { |
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my $s = shift; |
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utf8::downgrade $s; |
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Digest::SHA::sha512 $s |
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} |
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=item Deliantra::Util::hash_pw $cleartext |
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Hashes a cleartext password into the binary password used in the protocol. |
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=cut |
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sub hash_pw($) { |
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# we primarily want to protect the password itself, and |
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# secondarily want to protect us against pre-image attacks. |
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# we don't want to overdo it, to keep implementation simple. |
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my $pass = shift; |
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utf8::encode $pass; |
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$pass = substr $pass, 0, 512 / 8; |
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my $hash; # first iteration is just dgst $pass |
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$hash = dgst $hash ^ $pass |
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for 0..499; |
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$hash |
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} |
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=item Deliantra::Util::auth_pw $hash, $nonce1, $nonce2 |
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Authenticates a (hashed) password using the given nonce. |
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=cut |
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sub auth_pw($$$) { |
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my ($hash, $nonce1, $nonce2) = @_; |
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# simple HMAC application |
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dgst $nonce1 . dgst $nonce2 . $hash |
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} |
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=back |
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=head1 AUTHOR |
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Marc Lehmann <schmorp@schmorp.de> |
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http://home.schmorp.de/ |
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=cut |
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