From af5d23c30f773e275bfbe630d51fbcc7464ded9b Mon Sep 17 00:00:00 2001 From: ferbas Date: Tue, 27 Oct 2009 10:47:09 +0000 Subject: added support for dynamic algorithm suites / acos04 git-svn-id: https://joinup.ec.europa.eu/svn/pdf-as/trunk@348 7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c --- .../pdfas/algorithmSuite/AlgorithmSuiteUtil.java | 193 +++++++++++++++++++++ 1 file changed, 193 insertions(+) create mode 100644 src/main/java/at/gv/egiz/pdfas/algorithmSuite/AlgorithmSuiteUtil.java (limited to 'src/main/java/at/gv/egiz/pdfas/algorithmSuite/AlgorithmSuiteUtil.java') diff --git a/src/main/java/at/gv/egiz/pdfas/algorithmSuite/AlgorithmSuiteUtil.java b/src/main/java/at/gv/egiz/pdfas/algorithmSuite/AlgorithmSuiteUtil.java new file mode 100644 index 0000000..0a1a5e4 --- /dev/null +++ b/src/main/java/at/gv/egiz/pdfas/algorithmSuite/AlgorithmSuiteUtil.java @@ -0,0 +1,193 @@ +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 out-param 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; + String verify_xml = null; + X509Certificate cert = so.getX509Certificate(); + String ids_string = so.getSigID(); + + //AlgorithmSuiteObject algSuite = new AlgorithmSuiteObject(ids_string); + algSuite.parseFrom(ids_string); + if (algSuite.isSpecified()) { + log.debug("Algorithm suite defined as parameter. Using new dynamic template replacement."); + cert_alg = AlgorithmMapper.getUri(algSuite.getSignatureMethod()); + + } else { + log.debug("NO algorithm suite defined as parameter. Using 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 CreateXMLSignatureResponse + * + * @param xmlResponse + * @return algorith suite string + */ + public static String extractAlgorithmSuiteString(String xmlResponse) { + + String elem = findFirstElement(xmlResponse, "SignatureMethod"); + System.err.println(elem); + String alg = findAttributeValue(elem, "Algorithm"); + System.err.println(alg); + + 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) { + StringBuilder sb = new StringBuilder(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; + } + } + +} -- cgit v1.2.3