--- /dev/null
+//
+// SecXPCHelper.h
+// Security
+//
+
+#ifndef SecXPCHelper_h
+#define SecXPCHelper_h
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface SecXPCHelper : NSObject
++ (NSSet<Class> *)safeErrorClasses;
++ (NSError *)cleanseErrorForXPC:(NSError * _Nullable)error;
+
+/*
+ * Some NSError objects contain non-NSSecureCoding-compliant userInfo.
+ * When in doubt, use cleanseErrorForXPC: before encodedDataFromError:
+ */
++ (NSError *)errorFromEncodedData:(NSData *)data;
++ (NSData *)encodedDataFromError:(NSError *)error;
+@end
+
+NS_ASSUME_NONNULL_END
+
+#endif // SecXPCHelper_h