Seld

This is the "Secure Element Daemon" used to communicate with the secure element hardware on the device. It is interacted with the nfcd daemon using XPC.

SELD plist:

{
    EnablePressuredExit = 1;
    EnableTransactions = 1;
    ExitTimeOut = 40;
    Label = "com.apple.seld";
    MachServices =     {
        "com.apple.seld" = 1;
        "com.apple.seld.aps" = 1;
    };
    Program = "/usr/libexec/seld";
    RunAtLoad = 1;
    UserName = mobile;
}

ApplePay personalization is performed using EMV BER-TLV commands to the secure element.

Major objects in the seld binary are:

• NFSecureElement(CertificateAuthority)
• SEDaemon
• NFSecureElement(ISO7816)
• NFSecureElement
• NFSecureElement(ContactlessRegistry)
• NFSecureElementCache
• NFSecureElementRemoteAdminAgent
• NFSecureElementRemoteAdminRequest
• NFSecureElementRemoteAdminRegistry
• NFResponseAPDU
• NFCardManagerAgent
• NFCardManagerAgent_XPC

NFCardManagerAgent Supported XPC Commands

ID	Command	Object
0x0 - 0x8	throw "unknown command" error	???
0x10	[NFCardAgentManager getInfoCache]	??
0x11	[NFCardManagerAgent signChallenge:callback:]	raw challenge data
0x12	[NFCardManagerAgent authorize:callback:]	dict{Authtype=??, SSEHandle=??}
0x13	[NFCardManagerAgent deauthorize]	???
0x14	[NFCardManagerAgent getApplications:]	???
0x15	[NFCardManagerAgent asActive:checkCache:callback:]	???
0x16	[NFCardManagerAgent markAllApplicationsForDelete]	???
0x17	[NFCardManagerAgent getActiveApplications:]	???
0x18	[NFCardManagerAgent getRestrictedMode:]	???
0x19-0x89	throw unknown command error	N/A
0x90	call [NFCardManagerAgent dumpAppData:callback:]	???
0x91	call [NFCardManagerAgent dumpRestrictedModeLogWithCallBack:]	???
>0x91	throw unknown command error	N/A

SEDaemon Supported XPC Commands

ID	Command	Object
<0x20	[NFCardManagerApplet XPCConnection:didReceiveCommand]	raw challenge data
0x20	[SEDaemon setDbgURL:	dict{Authtype=??, SSEHandle=??}
0x21	[SEDaemon getStateInfo]	???
0x22	[SEDaemon getNextPushInfo]	???
0x23	???	???
0x24	[SEDaemon pushTopicList:]	???
0x25	[SEDaemon isWiredModeAvailable:]	???
0x26	updateRegionalRegistrationData	???
0x27	[SEDaemon sharedRegistry]	???
0x30	register event listenter	???
0x31	something else for event listening?	???
>0x31	[NFCardManagerApplet XPCConnection:didReceiveCommand]	???

NFCardManagerAgent_XPC Supported XPC Commands

ID	Command	Object
0x0 - 0x8	throw "unknown command" error	???
0x10	[NFCardAgentManager getInfoCache]	??
0x11	[NFCardManagerAgent signChallenge:callback:]	raw challenge data
0x12	[NFCardManagerAgent authorize:callback:]	dict{Authtype=??, SSEHandle=??}
0x13	[NFCardManagerAgent deauthorize]	???
0x14	[NFCardManagerAgent getApplications:]	???
0x15	[NFCardManagerAgent asActive:checkCache:callback:]	???
0x16	[NFCardManagerAgent markAllApplicationsForDelete]	???
0x17	[NFCardManagerAgent getActiveApplications:]	???
0x18	[NFCardManagerAgent getRestrictedMode:]	???
0x19-0x89	throw unknown command error	N/A
0x90	call [NFCardManagerAgent dumpAppData:callback:]	???
0x91	call [NFCardManagerAgent dumpRestrictedModeLogWithCallBack:]	???
>0x91	throw unknown command error	N/A