Add suport for DoH over HTTP/3

vendor/github.com/go-task/slim-sprig/crypto.go

@@ -0,0 +1,24 @@
+package sprig
+
+import (
+	"crypto/sha1"
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"hash/adler32"
+)
+
+func sha256sum(input string) string {
+	hash := sha256.Sum256([]byte(input))
+	return hex.EncodeToString(hash[:])
+}
+
+func sha1sum(input string) string {
+	hash := sha1.Sum([]byte(input))
+	return hex.EncodeToString(hash[:])
+}
+
+func adler32sum(input string) string {
+	hash := adler32.Checksum([]byte(input))
+	return fmt.Sprintf("%d", hash)
+}