/**
   * Signs a SoapMessage with the holder-of-key configuration provided on class creation. This
   * method changes the SoapMessage.
   *
   * @param message cannot be null
   * @return The signed SoapMessage
   * @throws ParserException
   * @throws SignatureException
   */
  @Override
  public final SoapMessage sign(SoapMessage message) throws ParserException, SignatureException {

    assert message != null;

    Provider securityProvider = holderOfKeyConfig.getSecurityProvider();
    XMLSignatureFactory xmlSigFactory =
        (securityProvider != null)
            ? XMLSignatureFactory.getInstance("DOM", securityProvider)
            : XMLSignatureFactory.getInstance();

    try {
      String bodyUuid = createSoapBodyUuid(message);
      CanonicalizationMethod canonicalizationMethod =
          xmlSigFactory.newCanonicalizationMethod(
              CanonicalizationMethod.EXCLUSIVE, (C14NMethodParameterSpec) null);
      SignatureMethod signatureMethod = getSignatureMethod(xmlSigFactory);
      ArrayList<String> refList = new ArrayList<String>();
      refList.add(bodyUuid);
      refList.add(createTimestampUuid(message));
      List<Reference> references = createSignatureReferences(xmlSigFactory, refList);
      SignedInfo signedInfo =
          xmlSigFactory.newSignedInfo(canonicalizationMethod, signatureMethod, references);

      KeyInfoFactory kif = KeyInfoFactory.getInstance();
      KeyInfo ki =
          kif.newKeyInfo(
              Collections.singletonList(new DOMStructure(createKeyInfoContent(message))));

      XMLSignature signature =
          xmlSigFactory.newXMLSignature(signedInfo, ki, null, addUseKeySignatureId(message), null);

      DOMSignContext dsc =
          new DOMSignContext(
              holderOfKeyConfig.getPrivateKey(), message.getHeader().getFirstChild());
      dsc.putNamespacePrefix(XMLSignature.XMLNS, DIGITAL_SIGNATURE_NAMESPACE_PREFIX);

      signature.sign(dsc);

      log.debug("Message with SOAPBody id: " + bodyUuid + " is signed.");
    } catch (NoSuchAlgorithmException e) {
      log.debug(CREATING_SIGNATURE_ERR_MSG);
      throw new SignatureException(CREATING_SIGNATURE_ERR_MSG, e);
    } catch (InvalidAlgorithmParameterException e) {
      log.debug(CREATING_SIGNATURE_ERR_MSG);
      throw new SignatureException(CREATING_SIGNATURE_ERR_MSG, e);
    } catch (MarshalException e) {
      log.debug(CREATING_SIGNATURE_ERR_MSG);
      throw new SignatureException(CREATING_SIGNATURE_ERR_MSG, e);
    } catch (XMLSignatureException e) {
      log.debug(CREATING_SIGNATURE_ERR_MSG);
      throw new SignatureException(CREATING_SIGNATURE_ERR_MSG, e);
    }

    return message;
  }
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  private static void signImpl(
      DOMSignContext dsc,
      String digestMethod,
      String signatureMethod,
      String referenceURI,
      PublicKey publicKey,
      X509Certificate x509Certificate)
      throws GeneralSecurityException, MarshalException, XMLSignatureException {
    dsc.setDefaultNamespacePrefix("dsig");

    DigestMethod digestMethodObj = fac.newDigestMethod(digestMethod, null);
    Transform transform1 = fac.newTransform(Transform.ENVELOPED, (TransformParameterSpec) null);
    Transform transform2 =
        fac.newTransform("http://www.w3.org/2001/10/xml-exc-c14n#", (TransformParameterSpec) null);

    List<Transform> transformList = new ArrayList<Transform>();
    transformList.add(transform1);
    transformList.add(transform2);

    Reference ref = fac.newReference(referenceURI, digestMethodObj, transformList, null, null);

    CanonicalizationMethod canonicalizationMethod =
        fac.newCanonicalizationMethod(canonicalizationMethodType, (C14NMethodParameterSpec) null);

    List<Reference> referenceList = Collections.singletonList(ref);
    SignatureMethod signatureMethodObj = fac.newSignatureMethod(signatureMethod, null);
    SignedInfo si = fac.newSignedInfo(canonicalizationMethod, signatureMethodObj, referenceList);

    KeyInfo ki = null;
    if (includeKeyInfoInSignature) {
      ki = createKeyInfo(publicKey, x509Certificate);
    }
    XMLSignature signature = fac.newXMLSignature(si, ki);

    signature.sign(dsc);
  }