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+/**
+ * <copyright> Copyright 2006 by Know-Center, Graz, Austria </copyright>
+ * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
+ * joint initiative of the Federal Chancellery Austria and Graz University of
+ * Technology.
+ *
+ * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
+ * the European Commission - subsequent versions of the EUPL (the "Licence");
+ * You may not use this work except in compliance with the Licence.
+ * You may obtain a copy of the Licence at:
+ * http://www.osor.eu/eupl/
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the Licence is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing permissions and
+ * limitations under the Licence.
+ *
+ * This product combines work with different licenses. See the "NOTICE" text
+ * file for details on the various modules and licenses.
+ * The "NOTICE" text file is part of the distribution. Any derivative works
+ * that you distribute must include a readable copy of the "NOTICE" text file.
+ */
+package at.gv.egiz.pdfas.algorithmSuite;
+
+import java.security.cert.X509Certificate;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+import at.knowcenter.wag.egov.egiz.sig.connectors.ConnectorEnvironment;
+import at.knowcenter.wag.egov.egiz.sig.connectors.TemplateReplaces;
+import at.knowcenter.wag.egov.egiz.sig.connectors.bku.SignSignatureObject;
+
+/**
+ * Utility class for handling dynamic algorithm suites
+ *
+ * @author dferbas
+ *
+ */
+public class AlgorithmSuiteUtil {
+ private static Log log = LogFactory.getLog(AlgorithmSuiteUtil.class);
+
+ /**
+ * Creates new verify_xml, evaluates algorithm suite and replaces methods in verify_xml
+ *
+ * @param algSuite <code>out-param</code> empty algorithm suite object
+ * @param environment connector environment to load verify template
+ * @param so signsignator object
+ * @return verify xml
+ */
+ public static String evaluateReplaceAlgs(AlgorithmSuiteObject algSuite, ConnectorEnvironment environment, SignSignatureObject so) {
+
+ String verify_template = environment.getVerifyTemplate();
+
+ String cert_alg = null;
+ String verify_xml = null;
+ X509Certificate cert = so.getX509Certificate();
+ String ids_string = so.getSigID();
+
+ //AlgorithmSuiteObject algSuite = new AlgorithmSuiteObject(ids_string);
+ algSuite.parseFrom(ids_string, true);
+ // 1. is specified in sig_id
+ if (algSuite.isSpecified()) {
+ log.debug("Algorithm suite defined as parameter. Using new dynamic template replacement.");
+ cert_alg = AlgorithmMapper.getUri(algSuite.getSignatureMethod());
+
+ // 2. is specified in /alg replace -> baik
+ } else if (so.getSigAlgorithm() != null && so.getSigAlgorithm().length() > 0) {
+ String algAbbr = AlgorithmMapper.getAbbreviation(so.getSigAlgorithm());
+ algSuite.parseFrom(algAbbr, false);
+
+ if (algSuite.isSpecified()) {
+ log.debug("Algorithm /alg available. Using: " + so.getSigAlgorithm());
+ cert_alg = AlgorithmMapper.getUri(algSuite.getSignatureMethod());
+// algSuite.setCertDigestMethod("sha1");
+ //algSuite.setPropertiesDigestMethod("sha1");
+ }
+ }
+
+ // 3. default
+ if (cert_alg == null) {
+ log.debug("NO algorithm suite defined. Using default old static algorithm.");
+
+ cert_alg = environment.getCertAlgEcdsa();
+ if (cert.getPublicKey().getAlgorithm().indexOf("RSA") >= 0) //$NON-NLS-1$
+ {
+ cert_alg = environment.getCertAlgRsa();
+ }
+
+ // fix digest methods to sha1 for old algorithm
+ String oldDigest = "sha1";
+ algSuite.setCertDigestMethod(oldDigest);
+ algSuite.setDataDigestMethod(oldDigest);
+ algSuite.setPropertiesDigestMethod(oldDigest);
+
+ }
+
+ // cert alg replace
+ verify_xml = verify_template.replaceFirst(TemplateReplaces.CERT_ALG_REPLACE, cert_alg);
+
+ // digest method replaces
+ verify_xml = verify_xml.replaceFirst(TemplateReplaces.DATA_DIGEST_REPLACE,
+ AlgorithmMapper.getUri(algSuite.getDataDigestMethod()));
+ verify_xml = verify_xml.replaceFirst(TemplateReplaces.PROPERTIES_DIGEST_REPLACE,
+ AlgorithmMapper.getUri(algSuite.getPropertiesDigestMethod()));
+ verify_xml = verify_xml.replaceFirst(TemplateReplaces.CERT_DIGEST_REPLACE,
+ AlgorithmMapper.getUri(algSuite.getCertDigestMethod()));
+ return verify_xml;
+ }
+
+
+ /**
+ * Extract algorithm suite as optimized string from <code>CreateXMLSignatureResponse<code>
+ *
+ * @param xmlResponse
+ * @return algorith suite string
+ */
+ public static String extractAlgorithmSuiteString(String xmlResponse) {
+
+ String elem = findFirstElement(xmlResponse, "SignatureMethod");
+
+ String alg = findAttributeValue(elem, "Algorithm");
+
+ List digAlgs = findAllAttributeValues(xmlResponse, "DigestMethod", "Algorithm");
+
+ digAlgs.add(0, AlgorithmMapper.getHashUriFromSuite(alg));
+
+ reduceDigestAlgs(digAlgs);
+
+ digAlgs.remove(0);
+
+ return createSigDevString(alg, digAlgs);
+
+ }
+
+ public static boolean isDefaultCertAlg(String algsString, String defaultCertAlg) {
+ return AlgorithmMapper.getAbbreviation(defaultCertAlg).equals(algsString);
+ }
+
+ private static String createSigDevString(String suite, List digAlgs) {
+ StringBuffer sb = new StringBuffer(AlgorithmMapper.getAbbreviation(suite));
+ for (Iterator iterator = digAlgs.iterator(); iterator.hasNext();) {
+ String dig = (String) iterator.next();
+ sb.append(":").append(AlgorithmMapper.getAbbreviation(dig));
+ }
+ return sb.toString();
+ }
+
+ private static String findAttributeValue(String elemContent, String attrName) {
+
+ String sig_alg = removeAllWhitespace(elemContent);
+
+ attrName += "=\"";
+ int start = sig_alg.indexOf(attrName) + attrName.length();
+ int end = sig_alg.indexOf("\"", start);
+ return sig_alg.substring(start, end);
+
+ }
+
+ private static String findFirstElement(String xml, String elemName) {
+ Pattern p = Pattern.compile("<[\\w]*:?" + elemName);
+ Matcher m = p.matcher(xml);
+ if (m.find()) {
+ int start = m.start();
+ int end = xml.indexOf("/>", start) + 2;
+ return xml.substring(start, end);
+ }
+ return null;
+ }
+
+ private static List findElements(String xml, String elemName) {
+ Pattern p = Pattern.compile("<[\\w]*:?" + elemName);
+ Matcher m = p.matcher(xml);
+ ArrayList res = new ArrayList();
+ while (m.find()) {
+ int start = m.start();
+ int end = xml.indexOf("/>", start) + 2;
+ res.add(xml.substring(start, end));
+ }
+ return res;
+ }
+
+ private static String findAttributeValue(String xmlContent, String elemName, String attrName) {
+ String elemCont = findFirstElement(xmlContent, elemName);
+ return findAttributeValue(elemCont, attrName);
+ }
+
+ private static List findAllAttributeValues(String xmlContent, String elemName, String attrName) {
+ List elemConts = findElements(xmlContent, elemName);
+ ArrayList res = new ArrayList();
+ for (int i = 0; i < elemConts.size(); i++) {
+ res.add(findAttributeValue((String) elemConts.get(i), attrName));
+ }
+ return res;
+ }
+
+ /**
+ * Helper method to remove whitespaces from a string
+ * @param str
+ * @return
+ */
+ public static String removeAllWhitespace(String str) {
+ return str.replaceAll("\\s", ""); //$NON-NLS-1$ //$NON-NLS-2$
+ }
+
+ private static void reduceDigestAlgs(List digestAlgs) {
+ if (digestAlgs == null)
+ return;
+ reduceDigestAlgsRec(digestAlgs, digestAlgs.size() - 1);
+ }
+
+ private static void reduceDigestAlgsRec(List digestAlgs, int act) {
+ if (act <= 0)
+ return;
+ else if (digestAlgs.get(act - 1).equals(digestAlgs.get(act))) {
+ // reduce
+ digestAlgs.remove(act);
+ reduceDigestAlgsRec(digestAlgs, act - 1);
+ } else {
+ return;
+ }
+ }
+
+}