driver-only ECC: EPICs summary issue (Q3)

[mpg]

Requirement checklist:

• Fix version/Requested Timescales (can be used to describe Phased delivery milestones): 3.5 must have to TF-M code size improvements
• Description/Use Cases (Use cases list): people who have ECC accelerators / alternative implementation of ECC and want to save code size can compile out all of ecp.c and bignum.c (see restrictions below).
• Deliverables (list of deliverables agreed with stakeholders/client(s)): a version of Mbed TLS that supports this.
• Exclusions (what's not included in the scope of the work)
  • interruptible / restartable not supported - see [DI] Use interruptible sign/verify in X.509 & TLS #7292, [DI] Add interruptible APIs to PSA for ECDH #7293 and [DI] Use interruptible ECDH in TLS #7294
  • reading compressed point not supported - until PSA support it
  • derivation of ECC keys not supported - until we have driver support for cooked key derivation
  • ? support for SpecifiedECDomain - nice-to-have but low priority
  • removing bignum.c is only possible when RSA and FFDH are also disabled
• Dependencies (known external dependencies required for delivery): none
• Relevant Contact(s) (contact list for the relevant people to get more information about this requirement): Nordic, TF-M

Epic checklist:

• Is epic fully broken down? Yes
• Parallelisation: partially between the two EPICs as the dependency is incremental
• Conflicts: one conflict with code size work on PK, that should be resovled in a week
• Epic estimate 2c: 5.2w (6.6w including nice-to-have) / 2d: 2w
• Description/Use Case: OK
• DoD (expected deliverables, expected quality and exclusions): OK
• Experts list (if any otherwise N/A): @mpg
• Design documentation: docs/architecture/psa-migration/strategy.md + Driver-only ECC: goals and strategy #6839
• Dependencies: none
• Resources needed: Valerio doing most of the work, us mostly reviewing (Manuel, Paul, Tom D)
• Infra/Test Automation/CI needs: none
• Requirement link: none
• For a release: aiming for 3.5 (late September)
• Review use of a separator to split must-have from nice-to-have: OK
• Review issues in the epic according to the issue checklist below
• Changelog / documentation - mostly of it defered, wrap-up tasks at the end of each EPIC
• Task/issue checklist: OK

[mpg]

Closing as the EPICs had been completed (except the nice-to-have part of 2c).