Index: scripts/SSH-hostkey.nse
===================================================================
--- scripts/SSH-hostkey.nse	(revision 10361)
+++ scripts/SSH-hostkey.nse	(working copy)
@@ -32,12 +32,16 @@
 
 require("stdnse")
 require("shortport")
-require("openssl")
 require("bin")
 require("bit")
 require("base64")
 require("hash")
 
+if not pcall(require, "openssl") then
+  require("nmap")
+  nmap.quiet_error("Optional module openssl is not installed")
+end
+
 id = "SSH Hostkey"
 author = "Sven Klemm <sven () c3d2 de>"
 description = "Show SSH Hostkeys"
Index: nse_nmaplib.cc
===================================================================
--- nse_nmaplib.cc	(revision 10361)
+++ nse_nmaplib.cc	(working copy)
@@ -48,6 +48,23 @@
 static int l_get_timing_level(lua_State *L);
 static int l_get_dns_servers(lua_State *L);
 
+static int l_quiet_error(lua_State *L) {
+  size_t len;
+  const char *p;
+  char *s;
+
+  p = luaL_checklstring(L, -1, &len);
+  s = (char *) lua_newuserdata(L, len + 1);
+  strcpy(s, p);
+
+  luaL_getmetatable(L, "nmap.error");
+  lua_setmetatable(L, -2);
+
+  lua_error(L);
+
+  return 0;
+}
+
 int l_clock_ms(lua_State *L);
 
 static int mutex_i;
@@ -137,6 +154,7 @@
     {"timing_level", l_get_timing_level},
     {"mutex", l_mutex},
     {"get_dns_servers", l_get_dns_servers},
+    {"quiet_error", l_quiet_error},
     {NULL, NULL} 
   };
 
Index: nse_init.cc
===================================================================
--- nse_init.cc	(revision 10361)
+++ nse_init.cc	(working copy)
@@ -115,26 +115,28 @@
   lua_setfenv(L, -2); // set it
   if (lua_pcall(L, 0, 0, 0) != 0) // Call the function (loads globals)
   {
-    // Check for dependency errors
-    lua_getfield(L, LUA_REGISTRYINDEX, REQUIRE_ERRORS);
-    lua_pushvalue(L, -2); // the error
-    lua_gettable(L, -2);
-    if (lua_toboolean(L, -1)) // The error was thrown by require
-    {
-      if (o.verbose > 3 && !o.debugging)
-        error("%s: '%s' could not be loaded due to missing dependency '%s'",
-            SCRIPT_ENGINE, filename, lua_tostring(L, -1));
-      SCRIPT_ENGINE_DEBUGGING(
-        error("%s: '%s' threw a run time error and could not be loaded.\n%s",
-            SCRIPT_ENGINE, filename, lua_tostring(L, -3));
-      )
-    } else {
-      error("%s: '%s' threw a run time error and could not be loaded.",
-          SCRIPT_ENGINE, filename);
-      SCRIPT_ENGINE_DEBUGGING(
-        error("%s", lua_tostring(L, -3));
-      )
+    void *p = lua_touserdata(L, -1);
+    if (p != NULL) {
+      if (lua_getmetatable(L, -1)) {
+        lua_getfield(L, LUA_REGISTRYINDEX, "nmap.error");
+        if (lua_rawequal(L, -1, -2)) {
+          lua_pop(L, 2);
+          if (o.debugging) {
+            error("%s: '%s' threw a quiet error.",
+                SCRIPT_ENGINE, filename);
+            SCRIPT_ENGINE_DEBUGGING(
+              error("%s", (const char *) p);
+            )
+          }
+          return 0;
+        }
+      }
     }
+    error("%s: '%s' threw a run time error and could not be loaded.",
+        SCRIPT_ENGINE, filename);
+    SCRIPT_ENGINE_DEBUGGING(
+      error("%s", lua_tostring(L, -3));
+    )
     return 0;
   }