Login anonymously

[Bumblebee202111]

private fun createUsername(deviceId: String): String {
    val key = "3go8&$8*3*3h0k(2)2".toByteArray()
    val secondString =
        deviceId.toByteArray().mapIndexed { index, oldByte -> oldByte.xor(key[index % key.size]) }
            .toByteArray().md5().encodedAsBase64String()
    return "$deviceId $secondString".toByteArray().encodedAsBase64String()
}

Ported to Kotlin by me from other's code.
Binaryify's key seems faulty.
My base URL: https://interface.music.163.com/eapi/
Sorry that I don't know Dart, and maybe you don't know Kotlin either. But I still believe the above snippet is readable enough for you.