feat: gfmul and aes gcm working

src/utils/math.rs

@@ -10,3 +10,9 @@ pub fn xor_bytes(vec1: &Vec<u8>, mut vec2: Vec<u8>) -> Result<Vec<u8>> {
 
     Ok(vec2)
 }
+
+pub fn reverse_bits_in_bytevec(mut vec: Vec<u8>) -> Vec<u8> {
+    vec = vec.iter_mut().map(|byte| byte.reverse_bits()).collect();
+
+    vec
+}