ringct: add a version of addKeys which returns the result

src/ringct/rctOps.cpp

@@ -220,6 +220,11 @@ namespace rct {
         ge_p3_tobytes(AB.bytes, &A2);
     }
 
+    rct::key addKeys(const key &A, const key &B) {
+      key k;
+      addKeys(k, A, B);
+      return k;
+    }
 
     //addKeys1
     //aGB = aG + B where a is a scalar, G is the basepoint, and B is a point

src/ringct/rctOps.h

@@ -123,6 +123,7 @@ namespace rct {
 
     //for curve points: AB = A + B
     void addKeys(key &AB, const key &A, const key &B);
+    rct::key addKeys(const key &A, const key &B);
     //aGB = aG + B where a is a scalar, G is the basepoint, and B is a point
     void addKeys1(key &aGB, const key &a, const key & B);
     //aGbB = aG + bB where a, b are scalars, G is the basepoint and B is a point