refactor: Externalise AES and SEA functions

src/utils/math.rs

@@ -0,0 +1,9 @@
+use anyhow::Result;
+
+pub fn xor_bytes(vec1: &Vec<u8>, mut vec2: Vec<u8>) -> Result<Vec<u8>> {
+    for (byte1, byte2) in vec1.iter().zip(vec2.iter_mut()) {
+        *byte2 ^= byte1;
+    }
+
+    Ok(vec2)
+}