SRI: support options in hash expression

Author: hrj

src/Platform_Core/org/lobobrowser/context/AlgorithmDigest.java

@@ -57,13 +57,20 @@ private static List<AlgorithmDigest> getHashes(final String[] tokens) {
       }
       final String alg = token.substring(0, hyphen);
       if (str.containsKey(alg)) {
-        final AlgorithmDigest ag = new AlgorithmDigest(alg, token.substring(hyphen + 1), str.get(alg));
+        final String hashWithOptions = token.substring(hyphen + 1);
+        final String hash = parseHashExpression(hashWithOptions);
+        final AlgorithmDigest ag = new AlgorithmDigest(alg, hash, str.get(alg));
         hashes.add(ag);
       }
     }
     return hashes;
   }
 
+  private static String parseHashExpression(final String hashWithOptions) {
+    final int question = hashWithOptions.indexOf("?");
+    return (question < 0) ? hashWithOptions : hashWithOptions.substring(0, question);
+  }
+
   public static List<AlgorithmDigest> strongestAlgDigests(final List<AlgorithmDigest> hashes) {
     Collections.sort(hashes, (a, b) -> a.compareTo(b));
     final Integer strongest = hashes.get(0).strength;