public void sign()

in src/main/java/org/apache/jcp/xml/dsig/internal/dom/DOMXMLSignature.java [343:426]
69 lines of code
13 McCabe index (conditional complexity)

    public void sign(XMLSignContext signContext)
        throws MarshalException, XMLSignatureException
    {
        if (signContext == null) {
            throw new NullPointerException("signContext cannot be null");
        }
        DOMSignContext context = (DOMSignContext)signContext;
        marshal(context.getParent(), context.getNextSibling(),
                DOMUtils.getSignaturePrefix(context), context);

        // generate references and signature value
        List<Reference> allReferences = new ArrayList<>();

        // traverse the Signature and register all objects with IDs that
        // may contain References
        signatureIdMap = new HashMap<>();
        signatureIdMap.put(id, this);
        signatureIdMap.put(si.getId(), si);
        @SuppressWarnings("unchecked")
        List<Reference> refs = si.getReferences();
        for (Reference ref : refs) {
            signatureIdMap.put(ref.getId(), ref);
        }
        for (XMLObject obj : objects) {
            signatureIdMap.put(obj.getId(), obj);
            @SuppressWarnings("unchecked")
            List<XMLStructure> content = obj.getContent();
            for (XMLStructure xs : content) {
                if (xs instanceof Manifest) {
                    Manifest man = (Manifest)xs;
                    signatureIdMap.put(man.getId(), man);
                    @SuppressWarnings("unchecked")
                    List<Reference> manRefs = man.getReferences();
                    for (Reference ref : manRefs) {
                        allReferences.add(ref);
                        signatureIdMap.put(ref.getId(), ref);
                    }
                }
            }
        }
        // always add SignedInfo references after Manifest references so
        // that Manifest reference are digested first
        allReferences.addAll(refs);

        // generate/digest each reference
        for (Reference ref : allReferences) {
            digestReference((DOMReference)ref, signContext);
        }

        // do final sweep to digest any references that were skipped or missed
        for (Reference ref : allReferences) {
            if (((DOMReference)ref).isDigested()) {
                continue;
            }
            ((DOMReference)ref).digest(signContext);
        }

        Key signingKey = null;
        try {
            KeySelectorResult keySelectorResult = signContext.getKeySelector().select(ki,
                                                      KeySelector.Purpose.SIGN,
                                                      si.getSignatureMethod(),
                                                      signContext);
            signingKey = keySelectorResult.getKey();
            if (signingKey == null) {
                throw new XMLSignatureException("the keySelector did not " +
                                                "find a signing key");
            }
            ksr = keySelectorResult;
        } catch (KeySelectorException kse) {
            throw new XMLSignatureException("cannot find signing key", kse);
        }

        // calculate signature value
        try {
            byte[] val = ((AbstractDOMSignatureMethod)
                si.getSignatureMethod()).sign(signingKey, si, signContext);
            ((DOMSignatureValue)sv).setValue(val);
        } catch (InvalidKeyException ike) {
            throw new XMLSignatureException(ike);
        }

        this.localSigElem = sigElem;
    }