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-rw-r--r--plugin/dnssec/cache.go22
1 files changed, 22 insertions, 0 deletions
diff --git a/plugin/dnssec/cache.go b/plugin/dnssec/cache.go
new file mode 100644
index 000000000..ea95b73b4
--- /dev/null
+++ b/plugin/dnssec/cache.go
@@ -0,0 +1,22 @@
+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
+}