ThePassionate opened a new pull request, #18169:
URL: https://github.com/apache/nuttx/pull/18169
## Summary
This PR adds comprehensive support for software-based cryptographic key
management in NuttX, including MTD storage persistence and key generation
capabilities.
**Changes included:**
1. **crypto: support software key management based on MTD**
- Implements a storage backend using MTD (Memory Technology Device) to
persist cryptographic keys across reboots.
2. **crypto/swkey: support generating AES keys**
- Adds support for generating random AES keys (128, 192, and 256-bit) via
the software key manager.
3. **crypto/swkey: support generating ECC P-256 keys**
- Adds support for generating ECC secp256r1 (P-256) key pairs.
4. **crypto/keymgmt: return actual length if key exported successfully**
- Fixes `cryptodev_getkeystatus` to return the actual length of the
exported key data instead of a fixed size or error code on success.
## Impact
- **Is this a breaking change?** No
- **New features?** Yes (Soft Key Management, Key Generation, MTD
persistence)
- **Bug fixes?** Yes (Export length fix)
- **Security patches?** No
- **Hardware Support:** Architecture independent (depends on MTD and RNG)
## Testing
**Verification Status:**
- Basic functionality of software key management compilation and logic has
been verified.
- Initial validation of AES/ECC generation logic.
**Note:**
Comprehensive test cases specifically for the MTD-based persistence feature
(including mount/unmount scenarios and data integrity checks across reboots)
are currently being developed and will be provided in a follow-up commit or PR.
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