E302-Assinatura inválida. (Informar assinatura correta no documento XML.)

String C14N_TRANSFORM_METHOD = "http://www.w3.org/TR/2001/REC-xml-c14n-20010315";


            // lendo o arquivo xml
            DocumentBuilderFactory docBuilder = DocumentBuilderFactory.newInstance();
            Document doc = docBuilder.newDocumentBuilder().parse(arquivoXml);
            // obtendo a lista de nós que compoem a tag que conterá a assinatura
            NodeList enveloper = doc.getElementsByTagName(tagEnvelop);
            // verificando a existencia de um ID no nó evelope
            String sId = getElementID((Element) enveloper.item(0));
            if (!sId.isEmpty()) {
                sId = "#".concat(sId);
                ((Element) enveloper.item(0)).setIdAttribute("Id", true);
            }

            XMLSignatureFactory factorySignature = XMLSignatureFactory.getInstance("DOM");//, (Provider) Class.forName(providerName).newInstance());

            ArrayList transformList = new ArrayList();
            TransformParameterSpec transParamSpec = null;

            Transform envelopedTransform = factorySignature.newTransform(Transform.ENVELOPED, transParamSpec);
            Transform c14NTransform = factorySignature.newTransform(C14N_TRANSFORM_METHOD, transParamSpec);

            XPathFilterParameterSpec xPathParam = new XPathFilterParameterSpec("//".concat(tagEnvelop));
            Transform xPathTransf = factorySignature.newTransform(Transform.XPATH, xPathParam);
           
            transformList.add(envelopedTransform);
            transformList.add(c14NTransform);
            transformList.add(xPathTransf);
           
            Reference ref = factorySignature.newReference(sId, factorySignature.newDigestMethod(DigestMethod.SHA1, null), transformList, null, null);
           
            CanonicalizationMethod canonMeth = factorySignature.newCanonicalizationMethod(CanonicalizationMethod.EXCLUSIVE, (C14NMethodParameterSpec) null);
            SignatureMethod signMeth = getCertificado().getPublicKey() instanceof RSAPublicKey ? factorySignature.newSignatureMethod(SignatureMethod.RSA_SHA1, null) : factorySignature.newSignatureMethod(SignatureMethod.DSA_SHA1, null);
            SignedInfo signedInfo = factorySignature.newSignedInfo(canonMeth, signMeth, Collections.singletonList(ref));

            KeyInfoFactory factoryKeyInfo = factorySignature.getKeyInfoFactory();
                       
            List x509Content = new ArrayList();

            x509Content.add(getCertificado());
           
            X509Data x509Data = factoryKeyInfo.newX509Data(x509Content);
           
            List keyInfoList = new ArrayList();
            keyInfoList.add(x509Data);
            KeyInfo keyInfo = factoryKeyInfo.newKeyInfo(keyInfoList);

            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

            dbf.setNamespaceAware(true);

            //Document doc = dbf.newDocumentBuilder().parse(new FileInputStream("nota.xml") );
            DOMSignContext domSignContext = new DOMSignContext(getPrivKey(), doc.getDocumentElement());
            http://domSignContext.putNamespacePrefix(XMLSignature.XMLNS, "ds");
            XMLSignature signature = factorySignature.newXMLSignature(signedInfo, keyInfo);

            signature.sign(domSignContext);

            ///gera arquivo assinado
            OutputStream out = new FileOutputStream(arquivoXml);
            TransformerFactory transformFactory = TransformerFactory.newInstance();
            Transformer trans = transformFactory.newTransformer();
            trans.transform(new DOMSource(doc), new StreamResult(out));