| 1 | #! /usr/bin/perl |
| 2 | |
| 3 | my $MOD = 0x04c11db7; |
| 4 | |
| 5 | sub gfmul { |
| 6 | my ($x, $y) = @_; |
| 7 | my $a = 0; |
| 8 | |
| 9 | while ($y) { |
| 10 | if ($y & 1) { $a ^= $x }; |
| 11 | if ($x & 0x80000000) { $x <<= 1; $x &= 0xffffffff; $x ^= $MOD; } |
| 12 | else { $x <<= 1; } |
| 13 | $y >>= 1; |
| 14 | } |
| 15 | return $a; |
| 16 | } |
| 17 | |
| 18 | sub hash { |
| 19 | my ($k, $msg) = @_; |
| 20 | my $h = $k; |
| 21 | for (my $i = 0; $i < length $msg; $i++) { |
| 22 | my $m = ord(substr($msg, $i, 1)); |
| 23 | $h = gfmul($h ^ $m, $k); |
| 24 | } |
| 25 | printf " 0x%08x \"%s\" 0x%08x;\n", $k, $msg, $h; |
| 26 | } |
| 27 | |
| 28 | print <<EOF; |
| 29 | # test vectors for unihash |
| 30 | |
| 31 | hash { |
| 32 | EOF |
| 33 | hash(0x00000000, "anything you like"); |
| 34 | hash(0x12345678, "an exaple test string"); |
| 35 | hash(0xb8a171f0, "The quick brown fox jumps over the lazy dog."); |
| 36 | hash(0x2940521b, "A man, a plan, a canal: Panama!"); |
| 37 | |
| 38 | my $k = 0x94b22a73; |
| 39 | my $m = 0xbb7b1fef; |
| 40 | for (my $i = 0; $i < 48; $i++) { |
| 41 | hash($k, "If we don't succeed, we run the risk of failure."); |
| 42 | $k = gfmul($k, $m); |
| 43 | } |
| 44 | |
| 45 | print <<EOF; |
| 46 | } |
| 47 | EOF |