Interlaced protocol for smart card application development

• US 7,516,444 B2
• Filed: 08/16/2004
• Issued: 04/07/2009
• Est. Priority Date: 05/11/1999
• Status: Expired due to Fees

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Guthery, Scott B., Milstein, David, Odinak, Gilad, Schutz, Klaus U., Perlin, Eric C., Deo, Vinay
• Primary Examiner(s): Zhen; Wei Y
• Assistant Examiner(s): Rampuria; Satish
• Application Number:
  US10/919,727
• Publication Number:
  US 20050022169A1
• Time in Patent Office: 1,695 Days
• Field of Search: 717/106, 717124-135, 235/375, 235/380, 235/382, 235/439, 235/441, 235/451, 235/492
• US Class Current: 717/125
• CPC Class Codes: G06F 11/3656 using a specific debug interface
• CPC Class Codes: G06Q 20/105 involving programming of a portable memory device, e.g. IC cards, "electronic purses"

Abstract

An integrated circuit (IC) card is presented comprising an input/output (I/O) interface and a smart card development interface (SCDI), coupled to the I/O interface, to receive and identify debug frames interlaced within a normal communication flow between the IC card and a host system.

Claims

1. An integrated circuit (IC) card comprising:

a memory device having stored therein a plurality of executable instructions;

an input/output (I/O) interface;

a smart card development interface (SCDI), coupled to the I/O interface, to receive and identify one or more debug frames interlaced within a normal communication flow between the IC card and a host system; and

a controller, coupled to the memory device and the SCDI, to execute at least a subset of the plurality of executable instructions to selectively implement at least one IC card application and a debug application which selectively controls the IC card application executing on the IC card,

wherein the SCDI is configured to route the received debug frames to the debug application executing on the IC card, while promoting the application frames to the IC card application executing on the IC card, subject to conditions imposed by the debug frames,

wherein the SCDI is configured to implement one or more debug features on the IC card according to debug instructions embedded within the received debug frames, wherein the debug features include one or more of read/write IC card memory, get/set breakpoints in a IC card application, sequentially step an IC card application, run an IC card application, or release a IC card application frame,

wherein the SCDI is configured to generate one or more response debug frames in response to one or more received debug frames, interlace the one or more response debug frames with response application frames, and send the one or more response debug frames and response application frames to the host system.

2. An IC card according to claim 1, wherein the smart card development interface includes a debug filter to identify and remove the debug frames from the normal communication flow.

3. An IC card according to claim 2, wherein the debug filter redirects the debug frames to a debug application on the IC card.

4. An IC card according to claim 1, wherein the debug application, responsive to debug instructions embedded within received debug frames, provides a user with a plurality of application debug features enabled in response to the received debug instructions.

5. An IC card according to claim 1, wherein the IC card communicates with a remote host system using a transport protocol comprising application data units (APDU) and debug protocol data units (DPDU).

6. An IC card according to claim 5, wherein the transport protocol is a standard smart card communication protocol, wherein the APDU and the DPDU adhere to the standard IC card communication protocol.

7. An IC card according to claim 5, wherein the smart card development interface further comprises a debug filter which identifies DPDU within the normal communication flow to redirect the DPDU to a debug application on the IC card.

8. An IC card according to claim 7, wherein the debug filter identifies DPDU within the normal communication flow by detecting an invalid source and/or destination address identifier within the debug frame.

9. An IC card according to claim 1, wherein the IC card communicates with a remote host system using a transport protocol comprising application data units (APDU) including normal application frames and debug frames.

10. A storage medium having stored thereon a plurality of executable instructions which, when executed, implement the smart card development interface of claim 1.

11. A method of debugging a smart card application, the method comprising:

receiving one or more debug frames interlaced with application frames comprising a normal communication flow between a smart card and a host system;

identifying the one or more debug frames by;

reading a source and/or destination address of frames comprising the normal communication flow; and

detecting invalid source and/or destination addresses in select frames denoting debug frames;

routing the received debug frames to a debug application executing on the smart card, while promoting the application frames to an application executing on the smart card, subject to conditions imposed by the debug frames;

implementing one or more debug features on the smart card according to debug instructions embedded within the received debug frames, wherein the debug features include one or more of read/write smart card memory, get/set breakpoints in a smart card application, sequentially step a smart card application, run a smart card application, and release a smart card application frame;

generating a response debug frame to a received debug frame;

interlacing the response debug frame with response application frames; and

sending the response debug frame and response application frames to a host system.

12. A storage medium having stored thereon a plurality of instructions which, when executed, implement the method of claim 11.

13. A computer system comprising:

a memory device having stored therein a plurality of instructions;

an input/output (I/O) interface;

a client development interface, coupled to the I/O interface, to receive and identify debug frames interlaced within the normal communication flow between the computer system and a removably coupled smart card; and

a processor, coupled to the memory device and the client development interface, to execute at least a subset of the plurality of instructions to implement one or more applications including a smart card development application having a debug environment to send and receive debug frames to the smart card, said debug frames being interlaced within the normal communication flow between the computer system and the smart card,

wherein the debug frames written by the debug application invoke one or more of the following debug features;

read/write smart card memory, get/set breakpoints in a smart card application, sequentially step a smart card application, run a smart card application, or release a smart card application frame,

wherein the client development interface is configured to receive the normal communication flow from the smart card including the debug frames interlaced with the application frames, wherein the debug frames received from the smart card are received in response to debug frames issued by the computer system,

wherein the application frames are promoted to an associated application executing within an application development tool executing on the computer, while the debug frames are promoted to the smart card development application having the debug environment on the computer system.

14. A computer system according to claim 13, wherein the memory device includes a plurality of executable instructions which, when executed, implement a debug application on the computer system to communicate with and control smart card resources.

15. A computer system according to claim 13, wherein the client development interface includes a debug filter to identify and remove the debug frames from the normal communication flow between the computer system and the smart card.

16. A computer system according to claim 15, wherein the debug filter redirects debug frames received from the smart card to a debug application executing on the computer system.

17. A computer system according to claim 13, further comprising a debug application, to write and read debug frames to and from the smart card, facilitating a number of application debugging features.

18. A computer system according to claim 13, wherein the computer system communicates with the smart card using a transport protocol comprising application data units (APDU) and debug protocol data units (DPDU).

19. A computer system according to claim 18, wherein the client development interface further comprises a debug filter which identifies DPDU within the normal communication flow to redirect the DPDU to a debug application executing on the computer system.

20. A computer system according to claim 19, wherein the debug filter identifies DPDU within the normal communication flow by detecting an invalid source and/or destination address identifier within the debug frame.

21. A storage medium having stored thereon a plurality of executable instructions which, when executed, implement the client development interface of claim 13.

22. A computer-implemented method for debugging a smart card application, the method comprising:

generating one or more debug frames containing debug instructions by a debug application executing within a smart card application development environment on a computer, in response to user interaction with the smart card application development environment;

interlacing the generated debug frames with one or more application frames generated according to an associated application executing on the computer;

sending the application frames with the interlaced debug frames to a removably coupled smart card, wherein the debug frames invoke one or more debug features of the smart card according to debug instructions embedded within the received debug frames, wherein the debug features include one or more of read/write smart card memory, get/set breakpoints in a smart card application, sequentially step a smart card application, run a smart card application, or release a smart card application frame;

receiving a normal communication flow from the smart card including debug frames interlaced with application frames, wherein the debug frames received from the smart card are received in response to debug frames issued by the computer; and

promoting received application frames to the associated application executing on the computer, while the debug frames are promoted to the debug application executing within the smart card application development environment on the computer.

23. A computer-implemented method according to claim 22, wherein generating one or more debug frames comprises populating a source and/or destination field of the debug frame with an invalid source and/or destination address.