Bug with blake2b_nativeInOut() when out and in overlap

`out` was filled with BLAKE2b's IV. Thus overwriting the input.

blake2b.cpp

@@ -343,7 +343,17 @@ void blake2b_nativeIn(void *out, size_t outSize, const uint64_t *in, size_t inSi
  */
 void blake2b_nativeInOut(uint64_t out[8], const uint64_t *in, size_t inSize)
 {
-	blake2b_native(out, 0x01010040, in, inSize);
+	uint64_t hash[8];
+
+	blake2b_native(hash, 0x01010040, in, inSize);
+
+	for (size_t i = 0; i < 8; i++)
+	{
+		out[i] hash[i];
+	}
+
+	// Clear
+	secureClearMemory(hash, sizeof(hash));
 }
 
 #endif