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58 lines
1.1 KiB
Perl
58 lines
1.1 KiB
Perl
#!/usr/bin/env perl
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##
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## Author......: See docs/credits.txt
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## License.....: MIT
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##
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use strict;
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use warnings;
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use Digest::SHA qw (sha1);
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use Digest::HMAC qw (hmac_hex);
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sub module_constraints { [[0, 255], [8, 12], [-1, -1], [-1, -1], [-1, -1]] }
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sub module_generate_hash
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{
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my $word = shift;
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my $salt = shift;
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my $padded_time = sprintf ("%016x", int (int ($salt) / 30));
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my $data = pack ('H*', $padded_time);
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my $key = $word;
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my $digest = hmac_hex ($data, $key, \&sha1, 64);
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my $offset = hex (substr ($digest, -8)) & 0xf;
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$offset *= 2;
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my $token = hex (substr ($digest, $offset, 8));
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$token &= 0x7fffffff;
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$token %= 1000000;
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# token must be leading zero padded, and salt leading zero stripped
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my $hash = sprintf ("%06d:%d", $token, int ($salt));
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return $hash;
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}
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sub module_verify_hash
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{
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my $line = shift;
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my ($hash, $salt, $word) = split (':', $line);
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return unless defined $hash;
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return unless defined $salt;
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return unless defined $word;
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my $word_packed = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word_packed, $salt);
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return ($new_hash, $word);
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}
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1;
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