Fixed buffer overflow

When USE_VENDER_BLAKE2B is defined

blake2b.cpp

@@ -70,7 +70,7 @@ 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)
 {
-	uint8_t hash[8];
+	uint8_t hash[64];
 
 	// Hash
 	blake2b_nativeIn(hash, 64, in, inSize);