tinycrypto: add unix as compile flags to use dev/random

[ThePassionate]

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

[acassis]

@ThePassionate why the -Dhex2bin=ltp_hex2bin was removed? What is the impact of removing it? Do you know if LTP will still function correctly after this removal?

[xiaoxiang781216]

both project define hex2bin function, it's better to let ltp redefine it's symbol since ltp is a test project.