Method and apparatus for extending security model to native code

• US 6,219,787 B1
• Filed: 12/22/1997
• Issued: 04/17/2001
• Est. Priority Date: 12/22/1997
• Status: Expired due to Term

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Brewer, Jason M.
• Primary Examiner(s): Swann, Tod R.
• Assistant Examiner(s): KABAKOFF, STEPHEN ERIC
• Application Number:
  US08/995,603
• Time in Patent Office: 1,212 Days
• Field of Search: 380/25, 395/706, 395/500, 395/42, 713/176, 713/164, 713/167, 713/166, 713/165, 709/400, 709/211
• US Class Current: 713/167
• CPC Class Codes: G06F 8/52 Binary to binary
• CPC Class Codes: G06F 9/44521 Dynamic linking or loading; Link editing at or after load time, e.g. Java class loading
• CPC Class Codes: G06F 9/45529 Embedded in an application, e.g. JavaScript in a Web browser

Abstract

A wireless data platform (10) comprises a plurality of processors (12, 16). Channels of communication are set up between processors such that they may communicate information as tasks are performed. A dynamic cross compiler (80) executed on one processor compiles code into native processing code for another processor. A dynamic cross linker (82) links the compiled code for other processor. Native code may also be downloaded to the platform through use of a JAVA Bean (90) (or other language type) which encapsulates the native code. The JAVA Bean can be encrypted and digitally signed for security purposes.

Claims

1. A method of controlling an electronic device having at least two processors comprising:

external to said electronic device, storing a file of native code and one or more associated attributes within a software program comprising source code;

encrypting both the source code and the native code in said software program;

downloading the software program to one of said at least two processors in said electronic device;

decrypting said software program;

retrieving said native code and attributes from the software program;

determining from said attributes whether another of said at least two processors has sufficient resources available to execute the native code; and

installing and executing said native code on said another of said at least two processors if sufficient resources are available.

2. The method of claim 1 wherein said software program comprises a JAVA Bean.

3. The method of claim 1 and further comprising the step of appending a digital signature to said software program.

4. The method of claim 3 and further comprising the steps of reading said digital signature from said software program and comparing said digital signature to a list of trusted sources.

5. The method of claim 1 wherein said software program further comprises real-time execution attributes associated with said native code.

6. The method of claim 5 and further comprising the step of encrypting said attributes.

7. The method of claim 1 wherein said downloading step comprises the step of downloading the software program from a global network.

8. The method of claim 7 wherein said downloading step comprises the step of downloading the software program from an Internet server.

9. A method of controlling an electronic device having at least two processors comprising:

external to said electronic device, storing a file of native code and one or more associated attributes within a software program comprising source code;

applying a digital signature to said software program;

downloading the software program to one of said at least two processors in said electronic device;

retrieving said native code and attributes from the software program;

verifying said digital signature;

determining from said attributes whether another of said at least two processors has sufficient resources available to execute the native code; and

installing and executing said native code on said another of said at least two processors responsive to said verifying step, if sufficient resources are available.

10. The method of claim 9 wherein said verifying step comprising the steps of reading said digital signature from said software program and comparing said digital signature to a list of trusted sources.

11. The method of claim 10 and further comprising the step of encrypting said software program prior to said downloading step.

12. The method of claim 10 and further comprising the step of decrypting said software program after said downloading step.

13. The method of claim 9 wherein said downloading step comprises the step of downloading the software program from a global network.

14. The method of claim 13 wherein said downloading step comprises the step of downloading the software program from an Internet server.

15. An electronic device comprising:

circuitry for coupling to an external device storing a file of native code and one or more associated attributes within a software program comprising source code, said external device encrypting both the source code and the native code in said software program;

a host processor for;

downloading the software program to said electronic device;

decrypting said software program;

retrieving said native code from the software program;

determining from said attributes whether a target processor in said electronic device has sufficient resources to execute the native code; and

installing and initiating the execution of said native code on said target processor if sufficient resources exist.

16. The electronic device of claim 15 wherein said software program comprises a JAVA Bean.

17. The electronic device of claim 15 wherein said external device comprises a global network server.

18. The electronic device of claim 15 wherein said external device comprises an Internet server.

19. The electronic device of claim 15 wherein said host processor further verifies a digital signature associated with said software program.

20. The electronic device of claim 15 wherein said target processor is a digital signal processor.

21. An electronic device comprising:

circuitry for coupling to an external device storing a file of native code and one or more associated attributes within a software program comprising source code, said external device applying a digital signature to said software program;

a host processor for;

downloading the software program to said electronic device;

verifying said digital signature;

retrieving said native code from the software program responsive to said verifying step;

determining from said attributes whether a target processor in said electronic device has sufficient resources to execute the native code; and

installing and initiating the execution of said native code on said target processor if sufficient resources exist.

22. The electronic device of claim 21 wherein said software program comprises a JAVA Bean.

23. The electronic device of claim 21 wherein said external device comprises a global network server.

24. The electronic device of claim 21 wherein said external device comprises an Internet server.

25. The electronic device of claim 21 wherein said software program is encrypted and said host processor further decrypts said software program.

26. The electronic device of claim 21 wherein said target processor is a digital signal processor.