add touch-policy cached

tool/cmdline.ggo

@@ -62,7 +62,7 @@ option "valid-days" - "Time (in days) until the self-signed certificate expires"
 option "pin" P "Pin/puk code for verification" string optional
 option "new-pin" N "New pin/puk code for changing" string optional dependon="pin"
 option "pin-policy" - "Set pin policy for action generate or import-key" values="never","once","always" enum optional
-option "touch-policy" - "Set touch policy for action generate, import-key or set-mgm-key" values="never","always" enum optional
+option "touch-policy" - "Set touch policy for action generate, import-key or set-mgm-key" values="never","always","cached" enum optional
 option "id" - "Id of object for write/read object" int optional
 option "format" f "Format of data for write/read object" values="hex","base64","binary" enum optional default="hex"
 option "sign" - "Sign data" flag off hidden

tool/util.c

@@ -604,6 +604,8 @@ unsigned char get_touch_policy(enum enum_touch_policy policy) {
       return YKPIV_TOUCHPOLICY_NEVER;
     case touch_policy_arg_always:
       return YKPIV_TOUCHPOLICY_ALWAYS;
+    case touch_policy_arg_cached:
+      return YKPIV_TOUCHPOLICY_CACHED;
     case touch_policy__NULL:
     default:
       return 0;