CFDictionaryRef SecXPCDictionaryCopyDictionary(xpc_object_t message, const char *key, CFErrorRef *error);
bool SecXPCDictionaryCopyDictionaryOptional(xpc_object_t message, const char *key, CFDictionaryRef *pdictionary, CFErrorRef *error);
CFDictionaryRef SecXPCDictionaryCopyDictionary(xpc_object_t message, const char *key, CFErrorRef *error);
bool SecXPCDictionaryCopyDictionaryOptional(xpc_object_t message, const char *key, CFDictionaryRef *pdictionary, CFErrorRef *error);