enum CpuFamily {
    CPU_UNKNOWN = 0x0;
    CPU_X86 = 0x1;
    CPU_X86_64 = 0x2;
    CPU_PPC = 0x3;
    CPU_PPC_64 = 0x4;
    CPU_ARM = 0x5;
    CPU_IA64 = 0x6;
    CPU_SH = 0x7;
    CPU_MIPS = 0x8;
    CPU_BLACKFIN = 0x9;
}

enum Os {
    OS_UNKNOWN = 0x0;
    OS_WINDOWS = 0x1;
    OS_OSX = 0x2;
    OS_IPHONE = 0x3;
    OS_S60 = 0x4;
    OS_LINUX = 0x5;
    OS_WINDOWS_CE = 0x6;
    OS_ANDROID = 0x7;
    OS_PALM = 0x8;
    OS_FREEBSD = 0x9;
    OS_BLACKBERRY = 0xa;
    OS_SONOS = 0xb;
    OS_LOGITECH = 0xc;
    OS_WP7 = 0xd;
    OS_ONKYO = 0xe;
    OS_PHILIPS = 0xf;
    OS_WD = 0x10;
    OS_VOLVO = 0x11;
    OS_TIVO = 0x12;
    OS_AWOX = 0x13;
    OS_MEEGO = 0x14;
    OS_QNXNTO = 0x15;
    OS_BCO = 0x16;
}

enum AuthenticationType {
    AUTHENTICATION_USER_PASS = 0x0;
    AUTHENTICATION_STORED_SPOTIFY_CREDENTIALS = 0x1;
    AUTHENTICATION_STORED_FACEBOOK_CREDENTIALS = 0x2;
    AUTHENTICATION_SPOTIFY_TOKEN = 0x3;
    AUTHENTICATION_FACEBOOK_TOKEN = 0x4;
}

message SystemInfo {
    required CpuFamily cpu_family = 0xa; 
    required Os os = 0x3c;
    required string system_information_string = 0x5a;
    required string device_id = 0x64;
}

message LoginCredentials {
    required string username = 0xa;
    required AuthenticationType typ = 0x14; 
    required bytes auth_data = 0x1e;
}

message ClientResponseEncrypted {
    required LoginCredentials login_credentials = 0xa; 
    required SystemInfo system_info = 0x32; 
    optional string version_string = 0x46; 
}