void DSIGSignedInfo::load()

in xsec/dsig/DSIGSignedInfo.cpp [200:329]
76 lines of code
27 McCabe index (conditional complexity)

void DSIGSignedInfo::load() {

	if (mp_signedInfoNode == 0) {
		// Attempt to load an empty signature element
		throw XSECException(XSECException::LoadEmptySignedInfo);
	}

	if (!strEquals(getDSIGLocalName(mp_signedInfoNode), "SignedInfo")) {
		throw XSECException(XSECException::LoadNonSignedInfo);
	}

	DOMNode* tmpSI = mp_signedInfoNode->getFirstChild();

	// Check for CanonicalizationMethod

	while (tmpSI != 0 && (tmpSI->getNodeType() != DOMNode::ELEMENT_NODE)) {
		if (tmpSI->getNodeType() == DOMNode::ENTITY_REFERENCE_NODE) {
			throw XSECException(XSECException::ExpectedDSIGChildNotFound,
				"EntityReference nodes in <SignedInfo> are unsupported.");
		}
		// Skip text and comments
		tmpSI = tmpSI->getNextSibling();
	}

	if (tmpSI == 0 || !strEquals(getDSIGLocalName(tmpSI), "CanonicalizationMethod")) {
		throw XSECException(XSECException::ExpectedDSIGChildNotFound, 
				"Expected <CanonicalizationMethod> as first child of <SignedInfo>");
	}

	// Determine what the canonicalization method is
	DOMNamedNodeMap* tmpAtts = tmpSI->getAttributes();

	DOMNode* algorithm = tmpAtts->getNamedItem(DSIGConstants::s_unicodeStrAlgorithm);

	if (algorithm == 0) {
		throw XSECException(XSECException::ExpectedDSIGChildNotFound,
					"Expected Algorithm attribute in <CanonicalizationMethod>");
	}

	mp_canonicalizationMethod = algorithm->getNodeValue();


	// Now load the SignatureMethod

	tmpSI = tmpSI->getNextSibling();

	while (tmpSI != 0 && (tmpSI->getNodeType() != DOMNode::ELEMENT_NODE)) {
		if (tmpSI->getNodeType() == DOMNode::ENTITY_REFERENCE_NODE) {
			throw XSECException(XSECException::ExpectedDSIGChildNotFound,
				"EntityReference nodes in <SignedInfo> are unsupported.");
		}
		// Skip text and comments
		tmpSI = tmpSI->getNextSibling();
	}

	if (tmpSI == 0 || !strEquals(getDSIGLocalName(tmpSI), "SignatureMethod")) {
		throw XSECException(XSECException::ExpectedDSIGChildNotFound, 
				"Expected <SignatureMethod> as child of <SignedInfo>");
	}


	// Determine the algorithms used to sign this document

	tmpAtts = tmpSI->getAttributes();

	algorithm = tmpAtts->getNamedItem(DSIGConstants::s_unicodeStrAlgorithm);
	
	if (algorithm == 0) {
		throw XSECException(XSECException::ExpectedDSIGChildNotFound,
					"Expected Algorithm attribute in <SignatureMethod>");
	}
	
	mp_algorithmURI = algorithm->getNodeValue();

	/* NOTE - as of version 1.3.1 all code relating to parsing the algorithm 
	 * has been removed.  This should all be handled inside the algorithm mappers.
	 * Having code here restricts available algorithms, as this code is not extended for
	 * new algorithms.
	 */

	/* Look for maximum output value. Really only applies to HMACs, but as we no
	 * longer know at this point if this is an HMAC, we need to check. */

	DOMNode *tmpSOV = tmpSI->getFirstChild();
	while (tmpSOV != NULL &&
		(tmpSOV->getNodeType() != DOMNode::ELEMENT_NODE || !strEquals(getDSIGLocalName(tmpSOV), "HMACOutputLength"))) {
		if (tmpSOV->getNodeType() == DOMNode::ENTITY_REFERENCE_NODE) {
			throw XSECException(XSECException::ExpectedDSIGChildNotFound,
				"EntityReference nodes in <SignedInfo> are unsupported.");
		}
		tmpSOV = tmpSOV->getNextSibling();
	}

	if (tmpSOV != NULL) {

		// Have a max output value!
		tmpSOV = tmpSOV->getFirstChild();
		while (tmpSOV != NULL && tmpSOV->getNodeType() != DOMNode::TEXT_NODE)
			tmpSOV = tmpSOV->getNextSibling();

		if (tmpSOV != NULL) {

			safeBuffer val;
			val << (*mp_formatter << tmpSOV->getNodeValue());
			m_HMACOutputLength = atoi((char *) val.rawBuffer());

		}
	}

	// Now look at references....

	tmpSI = tmpSI->getNextSibling();

	// Run through the rest of the elements until done

	while (tmpSI != 0 && (tmpSI->getNodeType() != DOMNode::ELEMENT_NODE)) {
		if (tmpSI->getNodeType() == DOMNode::ENTITY_REFERENCE_NODE) {
			throw XSECException(XSECException::ExpectedDSIGChildNotFound,
				"EntityReference nodes in <SignedInfo> are unsupported.");
		}
		// Skip text and comments
		tmpSI = tmpSI->getNextSibling();
	}

	if (tmpSI != NULL) {
		// Have an element node - should be a reference, so let's load the list
		mp_referenceList = DSIGReference::loadReferenceListFromXML(mp_env, tmpSI);
	}

}