CCID (PC/SC) over USB

Overview

A SpringCore USB-attached device running in PC/SC Mode implements the USB CCID specification.

According to the PC/SC specification, the operating system shall then provide a complete PC/SC stack and run a PC/SC USB driver for this device.

Operating system	PC/SC stack	PC/SC USB driver
Microsoft Windows	Supplied by the OS	SpringCard SDD480
Linux	PC/SC Lite (open source)	PC/SC Lite CCID driver (open source)
Apple Mac OS	Fork of PC/SC Lite	Fork of PC/SC Lite CCID driver

Operating system	Alternative to PC/SC
Android	SpringCard Companion Service (CCID implementation on top of Android’s USB Host API)
Apple iOS	None currently available (USB Host API not available out of MFI logo program)

The SpringCore device’s PC/SC interface uses the following endpoints to communicate with the host computer:

Endpoint	Purpose	Size	Protocol
Control	Initial setup
BulkOut	PC to RDR commands	64B	See paragraph CCID_PC_To_RDR below
BulkIn	RDR to PC responses	64B	See paragraph CCID_RDR_To_PC below
InterruptIn	RDR to PC notification of card(s) insertion/removal	8B	See paragraph CCID_Interrupts below

Communication over the BulkOut endpoint is fully specified in the USB CCID specification.

It contains a 10-byte CCID header, optionally followed by a payload (up to 64kB).

Bytes	Content
0-9	Header
10-N	Payload

Byte	Content
0	Command code, see table in the CCID protocol chapter.
1-4	Length of payload, LSB-first
5	Slot number
6	Sequence number
7-9	Command parameters

Communication over the BulkIn endpoint is fully specified in the USB CCID specification.

It contains a 10-byte CCID header, optionally followed by a payload (up to 64kB).

Bytes	Content
0-9	Header
10-N	Payload

Byte	Content
0	Response code. See table in the CCID protocol chapter.
1-4	Length of payload, LSB-first
5	Slot number
6	Sequence number
7	Slot status
8	Slot error
9	RFU