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148 lines
2.5 KiB
Perl
148 lines
2.5 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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sub module_constraints { [[-1, -1], [-1, -1], [0, 55], [8, 8], [-1, -1]] }
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sub MurmurHash
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{
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use integer;
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my $word = shift;
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my $seed = shift;
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# https://tanjent.livejournal.com/756623.html
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my $m = 0x7fd652ad;
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my $r = 16;
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my $hash = $seed;
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$hash += 0xdeadbeef;
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my @chars = unpack ("c*", $word);
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my $len = length $word;
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my $i;
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for ($i = 0; $i < $len - 3; $i += 4)
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{
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my $c0 = $chars[$i + 0];
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my $c1 = $chars[$i + 1];
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my $c2 = $chars[$i + 2];
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my $c3 = $chars[$i + 3];
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my $l = ($c0 << 0)
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| ($c1 << 8)
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| ($c2 << 16)
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| ($c3 << 24);
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$hash += $l;
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$hash *= $m;
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$hash ^= ($hash & 0xffffffff) >> $r;
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}
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my $rem = $len & 3;
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if ($rem == 3)
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{
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my $c0 = $chars[$i + 0];
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my $c1 = $chars[$i + 1];
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my $c2 = $chars[$i + 2];
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my $c3 = 0;
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my $l = ($c0 << 0)
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| ($c1 << 8)
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| ($c2 << 16)
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| ($c3 << 24);
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$hash += $l;
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$hash *= $m;
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$hash ^= ($hash & 0xffffffff) >> $r;
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}
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elsif ($rem == 2)
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{
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my $c0 = $chars[$i + 0];
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my $c1 = $chars[$i + 1];
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my $c2 = 0;
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my $c3 = 0;
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my $l = ($c0 << 0)
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| ($c1 << 8)
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| ($c2 << 16)
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| ($c3 << 24);
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$hash += $l;
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$hash *= $m;
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$hash ^= ($hash & 0xffffffff) >> $r;
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}
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elsif ($rem == 1)
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{
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my $c0 = $chars[$i + 0];
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my $c1 = 0;
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my $c2 = 0;
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my $c3 = 0;
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my $l = ($c0 << 0)
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| ($c1 << 8)
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| ($c2 << 16)
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| ($c3 << 24);
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$hash += $l;
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$hash *= $m;
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$hash ^= ($hash & 0xffffffff) >> $r;
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}
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$hash *= $m;
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$hash ^= ($hash & 0xffffffff) >> 10;
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$hash *= $m;
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$hash ^= ($hash & 0xffffffff) >> 17;
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return $hash & 0xffffffff;
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}
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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 $salt_bin = pack ("H*", $salt);
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my $seed = unpack ("N", $salt_bin); # or maybe "L" ? not enought example data to clarify
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my $digest = MurmurHash ($word, $seed);
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my $hash = sprintf ("%08x:%08x", $digest, $seed);
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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 $word;
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return unless defined $salt;
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return unless length $hash == 8;
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return unless length $salt == 8;
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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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