Intial shitty commit

README.md

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+# OpenSSL Hybrid Encryption Test
+
+Test C++17 project for hybrid file encryption with OpenSSL:
+
+- RSA key pair generation
+- AES file encryption
+- RSA encryption of the temporary AES key
+- streaming file encryption/decryption
+
+The application creates a small test file, encrypts it, decrypts it back, and writes the restored result.
+
+## Requirements
+
+- CMake 3.24 or newer
+- C++17 compiler
+- On Windows: Visual Studio Build Tools or Visual Studio with the Desktop development with C++ workload
+
+On Windows, `CMakeLists.txt` downloads a pre-built OpenSSL package with `FetchContent` and copies the required DLLs next to the executable.
+
+## Build
+
+From the project directory:
+
+```powershell
+cmake -S . -B build
+cmake --build build --config Release
+```
+
+If you changed CMake options or headers and want a clean rebuild:
+
+```powershell
+cmake --build build --config Release --clean-first
+```
+
+## Run
+
+With Visual Studio generators, the executable is usually in `build\Release`:
+
+```powershell
+cd build\Release
+.\crypto_app.exe
+```
+
+The program generates these files in the current working directory:
+
+- `private.pem`
+- `public.pem`
+- `important_data.txt`
+- `important_data.enc`
+- `restored_data.txt`
+
+Expected console output:
+
+```text
+Generating RSA-4096 key pair...
+Success! Saved 'private.pem' and 'public.pem'.
+Encrypting file with public key...
+Decrypting file with private key...
+Done! Verify 'restored_data.txt' matching original inputs.
+```
+
+No output means the files match.
+
+## Notes
+
+If CMake reports `No CMAKE_CXX_COMPILER could be found`, install Visual Studio Build Tools and enable the C++ desktop workload.
+
+If the executable cannot find OpenSSL DLLs, rebuild the project so the post-build copy step can place the DLLs next to `crypto_app.exe`.