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| author | ferbas <ferbas@7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c> | 2009-10-27 10:47:09 +0000 |
|---|---|---|
| committer | ferbas <ferbas@7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c> | 2009-10-27 10:47:09 +0000 |
| commit | af5d23c30f773e275bfbe630d51fbcc7464ded9b (patch) | |
| tree | 75e61b2aae511855c901e27d96f860916ef342e7 /src/main/java/at/gv/egiz/pdfas/algorithmSuite/AlgorithmMapper.java | |
| parent | 8a16641b47e9908d6362e07244cbad972c3a1730 (diff) | |
| download | pdf-as-3-af5d23c30f773e275bfbe630d51fbcc7464ded9b.tar.gz pdf-as-3-af5d23c30f773e275bfbe630d51fbcc7464ded9b.tar.bz2 pdf-as-3-af5d23c30f773e275bfbe630d51fbcc7464ded9b.zip | |
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
Diffstat (limited to 'src/main/java/at/gv/egiz/pdfas/algorithmSuite/AlgorithmMapper.java')
| -rw-r--r-- | src/main/java/at/gv/egiz/pdfas/algorithmSuite/AlgorithmMapper.java | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/src/main/java/at/gv/egiz/pdfas/algorithmSuite/AlgorithmMapper.java b/src/main/java/at/gv/egiz/pdfas/algorithmSuite/AlgorithmMapper.java new file mode 100644 index 0000000..8af0db2 --- /dev/null +++ b/src/main/java/at/gv/egiz/pdfas/algorithmSuite/AlgorithmMapper.java @@ -0,0 +1,120 @@ +package at.gv.egiz.pdfas.algorithmSuite;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+/**
+ * Utility for mapping signature and hash algorithms between URI and abbreviation.<br>
+ * Supported algorithms are defined in external resource {@value #SUPPORTED_ALGORITHMS_RESOURCE}<br>
+ *
+ * e.g. <code>sha1 <-> http://www.w3.org/2000/09/xmldsig#sha1</code>
+ *
+ * @author dferbas
+ *
+ */
+
+public class AlgorithmMapper {
+ private static final String SUPPORTED_ALGORITHMS_RESOURCE = "supportedAlgorithms.txt";
+ private static Map algorithmMap = new HashMap();
+ private static Log log = LogFactory.getLog(AlgorithmMapper.class);
+
+ /**
+ * read available algorithms from resource
+ */
+ static {
+ try {
+ log.debug("reading supported algorithms from " + SUPPORTED_ALGORITHMS_RESOURCE);
+ List lines = IOUtils.readLines(AlgorithmMapper.class.getResourceAsStream(SUPPORTED_ALGORITHMS_RESOURCE));
+ for (int i = 0; i < lines.size(); i++) {
+ String uri = (String)lines.get(i);
+ if (isValidLine(uri)) {
+ String abbr = parseAbbreviation(uri);
+ algorithmMap.put(abbr, uri);
+ if (log.isDebugEnabled()) {
+ log.debug("added supported algorithm: " + abbr + "=" + uri);
+ }
+ }
+ }
+ } catch (IOException e) {
+ throw new RuntimeException("error loading supportetAlgorithms.properties file", e);
+ }
+ }
+
+ /**
+ * Get algorithm abbreviation (equals last part after namespace#) from uri<br>
+ *
+ * e.g. <code>sha1 from http://www.w3.org/2000/09/xmldsig#sha1</code>
+ *
+ * @param algorithmUri algorithm URI
+ * @return algorithm abbreviation
+ */
+ public static String getAbbreviation(String algorithmUri) {
+ if (!algorithmMap.containsValue(algorithmUri)) {
+ throw new RuntimeException("unsupported Algorithm " + algorithmUri);
+ }
+ return parseAbbreviation(algorithmUri);
+ }
+
+ private static boolean isValidLine(String uri) {
+ if (uri == null || uri.length() == 0) return false;
+ if (uri.trim().startsWith("#")) return false;
+ return true;
+ }
+
+ /**
+ * Get valid URI from algorithm abbreviation<br>
+ *
+ * e.g. <code>http://www.w3.org/2000/09/xmldsig#sha1 from sha1</code>
+ *
+ * @param algorithmShort
+ * @return URI
+ */
+ public static String getUri(String algorithmShort) {
+ if (!algorithmMap.containsKey(algorithmShort)) {
+ throw new RuntimeException("unsupported Algorithm " + algorithmShort);
+ }
+ return (String)algorithmMap.get(algorithmShort);
+ }
+
+ /**
+ * Get hash (abbreviation) from signature method (eg. sha1 from ecdsa-sha1).
+ * @param suite abbreviation or full qualified signature method
+ * @return digest method abbreviation
+ */
+ public static String getHashAbbrFromSuite(String suite) {
+ try {
+ int pos = suite.lastIndexOf('-');
+ return suite.substring(pos + 1);
+ } catch (Exception e) {
+ throw new RuntimeException("cannot parse algorithm string for hash method: " + suite);
+ }
+ }
+
+ /**
+ *
+ * Get hash method (URI) from signature method
+ * @param suite abbreviation or full qualified signature method
+ * @return digest method URI
+ *
+ */
+ public static String getHashUriFromSuite(String suite) {
+ return getUri(getHashAbbrFromSuite(suite));
+ }
+
+ private static String parseAbbreviation(String algorithmUri) {
+ try {
+ int pos = algorithmUri.lastIndexOf('#');
+ return algorithmUri.substring(pos + 1);
+ } catch (Exception e) {
+ throw new RuntimeException("invalid algorithm entry in " + SUPPORTED_ALGORITHMS_RESOURCE
+ + ": " + algorithmUri);
+ }
+ }
+
+}
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