---

utils/subBytes.ts

@@ -0,0 +1,13 @@
+import { SBox } from '../constants'
+
+export const subBytes = (state: number[][]): number[][] => {
+  const result: number[][] = []
+  for (let i = 0;i < state.length;i++) {
+    result[i] = []
+    for (let j = 0;j < state[0].length;j++) {
+      const byte = state[i][j]
+      result[i][j] = SBox[byte]
+    }
+  }
+  return result
+}