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Micro Security Support Provider Interface\n\n[![version](https://img.shields.io/github/release/deemru/msspi.svg)](https://github.com/deemru/msspi/releases/latest)\n[![windows](https://img.shields.io/badge/windows-supported-brightgreen.svg)](https://github.com/deemru/msspi)\n[![linux](https://img.shields.io/badge/linux-supported-brightgreen.svg)](https://github.com/deemru/msspi)\n[![macos](https://img.shields.io/badge/macos-supported-brightgreen.svg)](https://github.com/deemru/msspi)\n[![ios](https://img.shields.io/badge/ios-supported-brightgreen.svg)](https://github.com/deemru/msspi)\n[![mingw](https://img.shields.io/badge/mingw-supported-brightgreen.svg)](https://github.com/deemru/msspi)\n\nA cross-platform C library that provides a high-level interface for TLS/DTLS operations using Windows SChannel or compatible implementations.\n\n## Features\n\n- **OpenSSL-compatible API**: Core functions are interchangeable with OpenSSL counterparts\n- **Cross-platform**: Windows, Linux, macOS, iOS, and MinGW support\n- **TLS/DTLS support**: TLS 1.0-1.3 and DTLS 1.2 for secure connections\n- **CAPIX support**: Crypto API Proxy - deferred loading of cryptographic libraries without compile-time linking\n- **Smart card support**: PIN caching and hardware token integration\n\n## Documentation\n\n- [MSSPI](MSSPI.md) - Core TLS/DTLS functions\n- [MSSPI_CERT](MSSPI_CERT.md) - Certificate parsing functions\n- [CHANGELOG](CHANGELOG.md) - Version history and changes\n\n## Real-World Usage\n\nMSSPI powers TLS/SSL implementations in various projects across different ecosystems:\n\n| Project | Language | Purpose | Repository |\n|---------|----------|---------|------------|\n| **Chromium-Gost** | C++ | Browser cryptography with GOST support | [deemru/Chromium-Gost](https://github.com/deemru/Chromium-Gost) |\n| **stunnel-msspi** | C | Enhanced SSL tunneling | [CryptoPro/stunnel-msspi](https://github.com/CryptoPro/stunnel-msspi) |\n| **go-msspi** | Go | Go crypto framework integration | [deemru/go-msspi](https://github.com/deemru/go-msspi) |\n| **Qt OpenSSL Backend** | C++ | Qt framework SSL backend | [deemru/qtbase](https://github.com/deemru/qtbase) |\n\n### Key Integration Patterns\n\n- **Browser Integration**: Seamless TLS handshake switching between different crypto libraries\n- **Tunneling**: Enhanced SSL/TLS proxying with Windows cryptography\n- **Language Bindings**: Native TLS support for Go applications\n- **Framework Backends**: Drop-in SSL backend for Qt applications\n\n## Building\n\n### Windows\nBuilds a DLL with certificate parsing support:\n```cmd\ncd build_windows\nmake.bat\n```\nThis creates `msspi.dll` with full functionality including certificate parsing.\n\n### Linux\nBuild static libraries:\n```bash\ncd build_linux\nmake\n```\nAvailable targets:\n- `make` or `make all` - Build all static libraries\n- `make static` - Build basic library (`libmsspi.a`)\n- `make static-capix` - Build with CAPIX support (`libmsspi-capix.a`) for CryptoPro GOST cryptography\n- `make shared` - Build shared library (`libmsspi.so`)\n- `make clean` - Clean build artifacts\n\n**Build options:**\n- `MSSPI_USE_MSSPI_CERT` - Include certificate parsing functionality\n- `MSSPI_USE_CAPIX` - Enable Crypto API Proxy (CAPIX) for deferred loading of cryptographic libraries\n\n## License\n\nSee [LICENSE](LICENSE) file for details.\n\n## Contributing\n\nContributions are welcome! 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