Honda accord rolling code pwn

void rolling_code(byte* buff, byte* rbuff, uint8_t len)
{
  uint8_t r = 0x63;
  uint16_t c = 0x16;
  uint8_t c1 = c >> 8;
  uint8_t c2 = c & 0xff;
  
  for(int i = 0; i < len; ++i)
  {
    rbuff[i] = buff[i];
    for(int j = 0; j < 8; ++j)
    {
      if(c1 & 0x01)
      {
        c1 ^= 0x18;
        c1 >>= 1;
        c1 |= 0x80;
      }
      else
      {
        c1 >>= 1;
      }
    }
    rbuff[i] ^= c1;
    rbuff[i] ^= r;
  }
}

void rolling_code(byte* buff, byte* rbuff, uint8_t len)
{
  uint8_t