---

utils/expandKeyFake.ts

@@ -0,0 +1,22 @@
+export const expandKeyFake = (key: number[][]): number[][][] => {
+  /**
+   * @param {string} key - A string of 128, 192, or 256 bits.
+   * @returns {string[]} An array of round keys.
+   */
+  const N_k = key[0].length // Number of columns in the key matrix (4 for 128-bit, 6 for 192-bit, 8 for 256-bit)
+  const N_r = N_k + 6 // Number of rounds (10 for 128-bit, 12 for 192-bit, 14 for 256-bit)
+  const totalKeys = 4 * (N_r + 1) // Total number of 4-byte words required
+
+  const expandedKeys: number[][][] = []
+  for (let i = 0;i < totalKeys / 4;i++) {
+    const matrix: number[][] = [
+        [0, 0, 0, 0],
+        [0, 0, 0, 0],
+        [0, 0, 0, 0],
+        [0, 0, 0, 0],
+    ]
+    expandedKeys.push(matrix)
+  }
+
+  return expandedKeys
+}