tplink-realtek-switch-rrcp-arcfour-xor.ts

function rtl_rc4xor(data: ArrayBufferLike): Uint8Array {
  const s = new Uint8Array([
    191, 155, 227, 202, 99, 162, 79, 104, 49, 18, 190, 164, 30, 76, 189, 131, 23, 52, 86, 106, 207, 125, 126, 169, 196, 28, 172, 58, 188, 132, 160, 3, 36, 120, 144, 168, 12, 231, 116, 44, 41, 97, 108, 213, 42, 198, 32, 148, 218, 107, 247, 112, 204, 14, 66, 68, 91, 224, 206, 235, 33, 130, 203, 178, 1,
    134, 199, 78, 249, 123, 7, 145, 73, 208, 209, 100, 74, 115, 72, 118, 8, 22, 243, 147, 64, 96, 5, 87, 60, 113, 233, 152, 31, 219, 143, 174, 232, 153, 245, 158, 254, 70, 170, 75, 77, 215, 211, 59, 71, 133, 214, 157, 151, 6, 46, 81, 94, 136, 166, 210, 4, 43, 241, 29, 223, 176, 67, 63, 186, 137, 129,
    40, 248, 255, 55, 15, 62, 183, 222, 105, 236, 197, 127, 54, 179, 194, 229, 185, 37, 90, 237, 184, 25, 156, 173, 26, 187, 220, 2, 225, 0, 240, 50, 251, 212, 253, 167, 17, 193, 205, 177, 21, 181, 246, 82, 226, 38, 101, 163, 182, 242, 92, 20, 11, 95, 13, 230, 16, 121, 124, 109, 195, 117, 39, 98, 239,
    84, 56, 139, 161, 47, 201, 51, 135, 250, 10, 19, 150, 45, 111, 27, 24, 142, 80, 85, 83, 234, 138, 216, 57, 93, 65, 154, 141, 122, 34, 140, 128, 238, 88, 89, 9, 146, 171, 149, 53, 102, 61, 114, 69, 217, 175, 103, 228, 35, 180, 252, 200, 192, 165, 159, 221, 244, 110, 119, 48,
  ]);
  
  const result = new Uint8Array(data);
  let j = 0;
  for (let k = 0; k < result.length; k++) {
    const i = (k + 1) & 0xff;
    j = (j + s[i]) & 0xff;
    // swap s[i] & s[j]
    [s[i], s[j]] = [s[j], s[i]];
    
    // xor data[k] s[ s[i] + s[j] mod 0xff ];
    result[k] ^= s[(s[i] + s[j]) & 0xff];
  }

  return result;
}