CAPICOM.ICertificate cert = GetCertificate();
            cert.Display();
            
            CAdESCOM.CPSigner Signer = new CAdESCOM.CPSigner();
            Signer.Options = CAPICOM.CAPICOM_CERTIFICATE_INCLUDE_OPTION.CAPICOM_CERTIFICATE_INCLUDE_WHOLE_CHAIN;
            Signer.Certificate = cert;
            Signer.TSAAddress = [...];

            CAdESCOM.CadesSignedData SignedData = new CAdESCOM.CadesSignedDataClass();
	        
            // исходные данные в BASE64
            SignedData.Content = data;

            // подписываем
            string sign = SignedData.Sign(Signer, true, CAPICOM.CAPICOM_ENCODING_TYPE.CAPICOM_ENCODE_BASE64);

            // проверяем
            SignedData.Verify(sign, true, CAPICOM.CAPICOM_SIGNED_DATA_VERIFY_FLAG.CAPICOM_VERIFY_SIGNATURE_ONLY);