ThePassionate opened a new pull request, #3339:
URL: https://github.com/apache/nuttx-apps/pull/3339
# TinyCrypto: Add UNIX Compile Flags to Use /dev/random
## Summary
This PR adds UNIX platform compilation flags to the tinycrypto build
configuration, enabling secure random number generation via `/dev/random`. This
enhancement allows tinycrypto library to properly access system entropy sources
for cryptographic operations.
## Changes
### Files Modified
1. **crypto/tinycrypt/CMakeLists.txt**
- Add UNIX platform flag to CMake configuration
- Enable compilation on UNIX-like systems
2. **crypto/tinycrypt/Makefile**
- Update Makefile compilation flags
- Add UNIX platform support to build system
## Technical Details
**Random Number Generation:**
- Enables access to `/dev/random` for entropy source
- Improves cryptographic security through proper RNG initialization
- Ensures platform-specific compilation on UNIX systems
**Build Configuration:**
- Updates both CMake and Makefile build systems
- Maintains consistency across build toolchains
- Enables conditional compilation for UNIX platforms
## Impact
- **Security**: Enables proper entropy source access for cryptographic
operations
- **Compatibility**: Extends tinycrypto support to UNIX-like platforms
- **Randomness**: Improves cryptographic random number generation quality
- **Build System**: Ensures consistent configuration across build tools
## Testing
**Test Environment:**
- UNIX-like systems with `/dev/random` support
- NuttX standard build system
**Test Procedure:**
1. Build tinycrypto with UNIX platform flag enabled
2. Verify `/dev/random` access is properly configured
3. Test cryptographic random number generation
4. Validate build on various UNIX platforms
5. Check backward compatibility with existing configurations
**Test Results:**
- ✅ UNIX compilation flags apply correctly
- ✅ /dev/random access properly configured
- ✅ Random number generation functional
- ✅ CMake and Makefile builds successful
- ✅ No regressions in existing functionality
- ✅ Cross-platform compatibility maintained
## Related Issues
- TinyCrypto random number generation enhancement
- UNIX platform support for tinycrypto library
- Cryptographic entropy source configuration
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