Seld

This is the "Secure Element Daemon" used to communicate with the secure element hardware on the device. It is interacted with by 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
0x0 - 0x8	throw "unknown command" error
0x11	[NFCardManagerAgent signChallenge:callback:]
0x12	[NFCardManagerAgent authorize:callback:]
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
0x90	call [NFCardManagerAgent dumpAppData:callback:]
0x91	throw unknown command error
0x92	call [NFCardManagerAgent dumpRestrictedModeLogWithCallBack:]