Index: vendor/aes/aes.c
==================================================================
--- vendor/aes/aes.c
+++ vendor/aes/aes.c
@@ -339,10 +339,11 @@
       ((y>>3 & 1) * xtime(xtime(xtime(x)))) ^         \
       ((y>>4 & 1) * xtime(xtime(xtime(xtime(x))))))   \
 
 #endif
 
+#if (defined(CBC) && CBC == 1) || (defined(ECB) && ECB == 1)
 // MixColumns function mixes the columns of the state matrix.
 // The method used to multiply may be difficult to understand for the inexperienced.
 // Please use the references to gain more information.
 static void InvMixColumns(state_t* state)
 {
@@ -402,11 +403,11 @@
   (*state)[0][3] = (*state)[1][3];
   (*state)[1][3] = (*state)[2][3];
   (*state)[2][3] = (*state)[3][3];
   (*state)[3][3] = temp;
 }
-
+#endif // #if (defined(CBC) && CBC == 1) || (defined(ECB) && ECB == 1)
 
 // Cipher is the main function that encrypts the PlainText.
 static void Cipher(state_t* state, uint8_t* RoundKey)
 {
   uint8_t round = 0;

Index: vendor/aes/version
==================================================================
--- vendor/aes/version
+++ vendor/aes/version
@@ -1,1 +1,1 @@
-https://github.com/kokke/tiny-AES-c/commit/ce24c0db9d7543787e2571dd316c1225ada865ef
+https://github.com/kokke/tiny-AES-c/commit/2c88f70a20517078b4eebf4805154c1f6cfb2310