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coredns/plugin/dnssec/cache.go

23 lines
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package dnssec
import (
"hash/fnv"
"github.com/miekg/dns"
)
// hash serializes the RRset and return a signature cache key.
func hash(rrs []dns.RR) uint32 {
h := fnv.New32()
buf := make([]byte, 256)
for _, r := range rrs {
off, err := dns.PackRR(r, buf, 0, nil, false)
if err == nil {
h.Write(buf[:off])
}
}
i := h.Sum32()
return i
}