1 files changed, 16 insertions, 3 deletions
diff --git a/src/cz/crcs/ectester/data/EC_Store.java b/src/cz/crcs/ectester/data/EC_Store.java
index e4ba40c..426dcd9 100644
--- a/src/cz/crcs/ectester/data/EC_Store.java
+++ b/src/cz/crcs/ectester/data/EC_Store.java
@@ -21,9 +21,7 @@ import javax.xml.validation.SchemaFactory;
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.InputStream;
-import java.util.Collections;
-import java.util.Map;
-import java.util.TreeMap;
+import java.util.*;
 
 /**
  * @author Jan Jancar johny@neuromancer.sk
@@ -319,6 +317,21 @@ public class EC_Store {
         return getObject(objClass, query.substring(0, split), query.substring(split + 1));
     }
 
+    public static <T extends EC_Key> List<Map.Entry<EC_Curve, List<T>>> mapToCurve(Collection<T> keys) {
+        Map<EC_Curve, List<T>> curves = new TreeMap<>();
+        for (T key : keys) {
+            EC_Curve curve = EC_Store.getInstance().getObject(EC_Curve.class, key.getCurve());
+            List<T> curveKeys = curves.getOrDefault(curve, new LinkedList<>());
+            curveKeys.add(key);
+            curves.putIfAbsent(curve, curveKeys);
+        }
+        List<Map.Entry<EC_Curve, List<T>>> curveList = new LinkedList<>();
+        curveList.addAll(curves.entrySet());
+        Comparator<Map.Entry<EC_Curve, List<T>>> c = Comparator.comparing(o -> o.getKey().getBits());
+        curveList.sort(c.thenComparing(b -> b.getKey().getId()));
+        return curveList;
+    }
+
     public static EC_Store getInstance() {
         if (instance == null) {
             instance = new EC_Store();