Assinar digitalmente o arquivo XML

Published in Mar 13, 2020 11:28 AM Updated in Apr 02, 2020 03:55 PM

O código abaixo utiliza a classe TokenReader para obter o certificado digital:

JPasswordField jpf = new JPasswordField();

JOptionPane.showConfirmDialog(

null, jpf, "Senha:", JOptionPane.OK_CANCEL_OPTION);

XMLSignatureFactory fac = XMLSignatureFactory.getInstance("DOM");

Reference ref = fac.newReference(

"", fac.newDigestMethod(DigestMethod.SHA1, null),

Collections.singletonList(

fac.newTransform(

Transform.ENVELOPED, (TransformParameterSpec) null)),

null, null);

SignedInfo si = fac.newSignedInfo(

fac.newCanonicalizationMethod(

CanonicalizationMethod.INCLUSIVE,

(C14NMethodParameterSpec) null),

fac.newSignatureMethod(SignatureMethod.RSA_SHA1, null),

Collections.singletonList(ref));

TokenReader token = new TokenReader();

token.openKeyStore(jpf.getPassword());

X509Certificate cert = token.getCertificate();

KeyInfoFactory kif = fac.getKeyInfoFactory();

List x509Content = new ArrayList();

x509Content.add(cert.getSubjectX500Principal().getName());

x509Content.add(cert);

X509Data xd = kif.newX509Data(x509Content);

KeyInfo ki = kif.newKeyInfo(Collections.singletonList(xd));

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

dbf.setNamespaceAware(true);

Document doc =

dbf.newDocumentBuilder().parse(

new FileInputStream("arquivo_nao_assinado.xml"));

DOMSignContext dsc = new DOMSignContext(

token.getPrivateKey(), doc.getDocumentElement());

XMLSignature signature = fac.newXMLSignature(si, ki);

signature.sign(dsc);

OutputStream os = new FileOutputStream("arquivo_entrada.xml");

TransformerFactory tf = TransformerFactory.newInstance();

Transformer trans = tf.newTransformer();

trans.transform(new DOMSource(doc), new StreamResult(os));

Esse código abre o arquivo "arquivo_nao_assinado.xml" e a partir dele cria o XML "arquivo_entrada.xml", assinado pelo certificado digital do token USB inserido, pedindo a senha (PIN) do token em uma pequena janela.