diff --git a/src/ringct/rctOps.cpp b/src/ringct/rctOps.cpp
index 7182861c..23916838 100644
--- a/src/ringct/rctOps.cpp
+++ b/src/ringct/rctOps.cpp
@@ -368,15 +368,8 @@ namespace rct {
     //This takes the outputs and commitments
     //and hashes them into a 32 byte sized key
     key cn_fast_hash(const ctkeyV &PC) {
-        key rv = identity();
-        std::size_t l = (std::size_t)PC.size();
-        size_t i = 0, j = 0;
-        vector<char> m(l * 64);
-        for (i = 0 ; i < l ; i++) {
-            memcpy(&m[i * 64], &PC[i].dest, 32);
-            memcpy(&m[i * 64 + 32], &PC[i].mask, 32);
-        }
-        cn_fast_hash(rv, &m[0], 64*l);
+        key rv;
+        cn_fast_hash(rv, &PC[0], 64*PC.size());
         return rv;
     }
     
@@ -391,14 +384,8 @@ namespace rct {
    //put them in the key vector and it concatenates them
    //and then hashes them
    key cn_fast_hash(const keyV &keys) {
-       size_t l = keys.size();
-       vector<unsigned char> m(l * 32);
-       size_t i;
-       for (i = 0 ; i < l ; i++) {
-           memcpy(&m[i * 32], keys[i].bytes, 32);
-       }
        key rv;
-       cn_fast_hash(rv, &m[0], 32 * l);
+       cn_fast_hash(rv, &keys[0], keys.size() * sizeof(keys[0]));
        //dp(rv);
        return rv;
    }