hkneptune

  public static String signXmlContent(String inputFile, String keyStoreFilePath,
      String keyStorePassword, String keyStoreAlias) throws Exception {

    KeyStore keyStore = KeyStore.getInstance("PKCS12");
    keyStore.load(new FileInputStream(keyStoreFilePath), keyStorePassword.toCharArray());
    DocumentBuilderFactory buildFactory = DocumentBuilderFactory.newInstance();
    buildFactory.setNamespaceAware(true);
    Document document = buildFactory.newDocumentBuilder().parse(inputFile);
    XMLSignatureFactory xmLSignatureFactory = XMLSignatureFactory.getInstance("DOM",
        (Provider) Class.forName("org.jcp.xml.dsig.internal.dom.XMLDSigRI").newInstance());

hkneptune

  public static String sha256(File input) throws IOException {

    Digest sha256 = new Digest();
    sha256.update(Files.readAllBytes(input.toPath()));
    StringBuilder buff = new StringBuilder();

    for (byte b : sha256.digest()) {
      buff.append(String.format("%02x", b & 0xFF));
    }