# call as cmp_hash(\%localDigest, \%remoteDigest)
# returns true or false (%localDigest == %remoteDigest)
sub cmp_hash ($$) {
    my($h1, $h2) = @_;
    my @a1 = sort %$h1;
    my @a2 = sort %$h2;

    return 0 unless scalar(@a1) == scalar(@a2);
    for (my $i = 0; $i < $#a1; $i++) {
        # can't use foreach(@a1) here because we need to
        # know our position to find the corresponding
        # element in @a2
        if (ref($a1[$i]) eq 'HASH') {
            return 0 unless ref($a2[$i]) eq 'HASH';
            return 0 unless cmp_hash($a1[$i], $a2[$i]);
            next;
        }
        return 0 unless $a1[$i] eq $a2[$i];
    }
    return 1;
}
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