ThePassionate opened a new pull request, #18029:
URL: https://github.com/apache/nuttx/pull/18029
## Summary
This PR includes four improvements to the NuttX crypto subsystem:
1. **Add olen field for virtio mode support** - Add `olen` field to
`crypt_op` structure and `crp_olen` to `cryptop` structure to support output
length tracking in virtio crypto mode.
2. **Export ivlen to support different cipher algorithms** - Add `ivlen`
field to `crypt_op` and `crp_ivlen` to `cryptop` structure to support cipher
algorithms with different IV lengths.
3. **Optimize cryptodev without dynamic memory** - Replace dynamic memory
allocation with stack-based variables in `cryptodev_op()`. This eliminates
`kmm_malloc`/`kmm_free` overhead and simplifies error handling by removing the
need for goto bail cleanup paths.
4. **Determine the order of crypto drivers** - After adding the cross-core
crypto driver, there are now three encryption modes:
- Hardware driver in local core
- Crypto driver in remote core
- Software encryption in local core
This prioritizes local hardware driver first, then remote driver
(typically hardware), and finally local software encryption as a fallback.
## Impact
These changes improve crypto subsystem flexibility, performance, and support
for virtio-based crypto operations.
## Testing
Build and runtime tested on NuttX with software crypto drivers.
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