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-rw-r--r--aes.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/aes.c b/aes.c
index 21c8430..4c7645f 100644
--- a/aes.c
+++ b/aes.c
@@ -71,8 +71,10 @@ static uint8_t RoundKey[176];
// The Key input to the AES Program
static const uint8_t* Key;
-// Initial Vector used for CBC mode etc.
-static uint8_t* Iv;
+#if defined(CBC) && CBC
+ // Initial Vector used only for CBC mode
+ static uint8_t* Iv;
+#endif
// The lookup-tables are marked const so they can be placed in read-only storage instead of RAM
// The numbers below can be computed dynamically trading ROM for RAM -