@class NSData, NSString; @interface NGMMessageSignatureFormatter : NSObject <SignatureFormatter> @property (readonly, nonatomic) NSData *formattedSignedData; @property (readonly) unsigned long long hash; @property (readonly) Class superclass; @property (readonly, copy) NSString *description; @property (readonly, copy) NSString *debugDescription; - (void).cxx_destruct; - (id)signedData; - (id)initWithDHOutput:(id)a0 prekeyPub:(id)a1 ephemeralPub:(id)a2 recipientPub:(id)a3 ciphertext:(id)a4; @end