CSR support in crypto HSM

[sujaygkulkarni-nxp]

Problem

No CSR support in HSM layer
No HSM support for CASE protocol

Change overview

• Added CSR support in HSM layer
• Using P256 key from HSM for CASE operational key
• Using P256 key from HSM for CASE ephermel key
• PBKDF using HSM is disabled by default

Testing

• Tested manually on k32 and Linux
• Tested CSR functionality using CHIPCryptoPALTest

[jmartinez-silabs]

I don't really like how the buffer_index is decrease/calculated through out this function. It seems error prone.
The use of constants could help make this clearer
buffer_index -= kTlvHeader

[woody-apple]

@sujaygkulkarni-nxp ?

[sujaygkulkarni-nxp]

Sure. Updated the code by using kTlvHeader,
Also before accessing the buffer using buffer index, check is added as,
"VerifyOrExit(buffer_index > 0, error = CHIP_ERROR_INTERNAL);"

[github-actions]

Size increase report for "esp32-example-build" from edd134c

File	Section	File	VM
chip-shell.elf	.flash.text	-4	-4
chip-temperature-measurement-app.elf	.flash.text	60	60

Full report output

BLOAT REPORT

Files found only in the build output:
    report.csv

Comparing ./master_artifact/chip-lock-app.elf and ./pull_artifact/chip-lock-app.elf:

sections,vmsize,filesize
.debug_abbrev,0,700
.debug_info,0,273
.debug_line,0,4
.debug_loc,0,3

Comparing ./master_artifact/chip-all-clusters-app.elf and ./pull_artifact/chip-all-clusters-app.elf:

sections,vmsize,filesize
.debug_abbrev,0,1773
.debug_info,0,352
.debug_line,0,4
.debug_loc,0,-5

Comparing ./master_artifact/chip-shell.elf and ./pull_artifact/chip-shell.elf:

sections,vmsize,filesize
.debug_abbrev,0,292
.debug_info,0,56
.debug_line,0,4
[Unmapped],0,4
.debug_loc,0,-4
.flash.text,-4,-4

Comparing ./master_artifact/chip-temperature-measurement-app.elf and ./pull_artifact/chip-temperature-measurement-app.elf:

sections,vmsize,filesize
.debug_abbrev,0,1193
.debug_info,0,242
.flash.text,60,60
.debug_loc,0,5
.debug_line,0,4
[Unmapped],0,-60

Comparing ./master_artifact/chip-persistent-storage.elf and ./pull_artifact/chip-persistent-storage.elf:

sections,vmsize,filesize

Comparing ./master_artifact/chip-pigweed-app.elf and ./pull_artifact/chip-pigweed-app.elf:

sections,vmsize,filesize

[bzbarsky-apple]

@sujaygkulkarni-nxp is ENABLE_HSM_CASE_EPHERMAL_KEY supposed to be ENABLE_HSM_CASE_EPHEMERAL_KEY?