Change macro of ROTWORD to inline function

Signed-off-by: Constanza Heath <[email protected]>

Author: Constanza Heath

lib/aes_decrypt.c

@@ -38,6 +38,7 @@
 #include <utils.h>
 
 #define ZERO_BYTE 0x00
+
 static const uint8_t inv_sbox[256] = {
   0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e,
   0x81, 0xf3, 0xd7, 0xfb, 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87,

lib/aes_encrypt.c

@@ -62,7 +62,10 @@ static const uint8_t sbox[256] = {
   0xb0, 0x54, 0xbb, 0x16
 };
 
-#define rotword(a) (((a)>>24)|((a)<<8))
+static inline uint32_t rotword (uint32_t a) {
+  return (((a)>>24)|((a)<<8));
+}
+
 #define subbyte(a,o) (sbox[((a)>>(o))&0xff]<<(o))
 #define subword(a) (subbyte(a,24)|subbyte(a,16)|subbyte(a,8)|subbyte(a,0))