+/* See stb_is_container() in Skiboot */
+static bool is_signed(char *buffer, uint32_t len)
+{
+ if (!buffer || len <= SECURE_BOOT_HEADERS_SIZE)
+ return false;
+ if (be32_to_cpu(*(uint32_t *)buffer) != ROM_MAGIC_NUMBER)
+ return false;
+ return true;
+}
+