feat: combine tuf code

internal/util/crypto.go

@@ -0,0 +1,13 @@
+package util
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+)
+
+func HexHashBytes(input []byte) string {
+	s256 := sha256.New()
+	s256.Write(input)
+	hashSum := s256.Sum(nil)
+	return hex.EncodeToString(hashSum)
+}