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56 lines
1021 B
Perl
56 lines
1021 B
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::SipHash qw (siphash);
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sub module_constraints { [[-1, -1], [-1, -1], [0, 55], [32, 32], [-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 $seed = pack ("H*", $salt);
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my ($hi, $lo) = siphash ($word, $seed);
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my $hi_s = sprintf ("%08x", $hi);
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my $lo_s = sprintf ("%08x", $lo);
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$hi_s =~ s/^(..)(..)(..)(..)$/$4$3$2$1/;
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$lo_s =~ s/^(..)(..)(..)(..)$/$4$3$2$1/;
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my $hash = sprintf ("%s%s:2:4:%s", $hi_s, $lo_s, $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, undef, undef, $salt, $word) = split ":", $line;
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return unless (length $hash == 16);
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return unless (length $salt == 32);
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return unless defined $hash;
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return unless defined $salt;
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return unless defined $word;
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$word = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word, $salt);
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return ($new_hash, $word);
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}
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1;
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