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Improve CSharp Examples
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‎.github/workflows/visual-studio.yml

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name: Build for .NET 3.5
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# START OF COMMON SECTION
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on:
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push:
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branches: [ 'master', 'main', 'release/**' ]
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pull_request:
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branches: [ '*' ]
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workflow_dispatch:
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concurrency:
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group: ${{ github.workflow }}-${{ github.ref }}
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cancel-in-progress: true
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# END OF COMMON SECTION
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jobs:
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build:
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if: github.repository_owner == 'wolfssl'
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runs-on: windows-2019 # .NET 3.5 is available here
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steps:
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# Checkout PR branch (supports both forks and local PRs)
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- name: Checkout Repository (PR branch or push branch)
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uses: actions/checkout@v3
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with:
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repository: ${{ github.event.pull_request.head.repo.full_name || github.repository }}
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ref: ${{ github.event.pull_request.head.ref || github.ref_name }}
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# Checkout wolfSSL (PR branch if from fork, master if push)
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- name: Checkout wolfSSL (PR branch or master)
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uses: actions/checkout@v3
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with:
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repository: ${{ github.event.pull_request.head.repo.full_name || 'wolfssl/wolfssl' }} # Pull from fork if PR exists
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ref: ${{ github.event.pull_request.head.ref || 'master' }} # Use PR branch if available, otherwise master
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path: wolfssl # Clone wolfSSL into "wolfssl" subdirectory
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- name: Setup MSBuild
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uses: microsoft/setup-msbuild@v1
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# wolfSSL core
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- name: Build wolfSSL (DLL Debug, x64)
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working-directory: wolfssl
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run: |
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msbuild wolfssl.vcxproj /p:Configuration="DLL Debug" /p:Platform=x64 /p:PlatformToolset=v142 /m /verbosity:normal
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shell: cmd
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# C# Wrapper
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- name: Build wolfSSL_CSharp
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working-directory: wrapper/CSharp/wolfSSL_CSharp
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run: msbuild wolfSSL_CSharp.csproj /p:TargetFrameworkVersion=v3.5
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# wolfCrypt-Test
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- name: Build wolfCrypt-Test
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working-directory: wrapper/CSharp/wolfCrypt-Test
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run: msbuild wolfCrypt-Test.csproj /p:TargetFrameworkVersion=v3.5
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# DTLS
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- name: Build wolfSSL-DTLS-Server
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working-directory: wrapper/CSharp/wolfSSL-DTLS-Server
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run: msbuild wolfSSL-DTLS-Server.csproj /p:TargetFrameworkVersion=v3.5
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# DTLS-PSK
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- name: Build wolfSSL-DTLS-PSK-Server
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working-directory: wrapper/CSharp/wolfSSL-DTLS-PSK-Server
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run: msbuild wolfSSL-DTLS-PSK-Server.csproj /p:TargetFrameworkVersion=v3.5
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# TLS
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- name: Build wolfSSL-TLS-Client
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working-directory: wrapper/CSharp/wolfSSL-TLS-Client
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run: msbuild wolfSSL-TLS-Client.csproj /p:TargetFrameworkVersion=v3.5
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- name: Build wolfSSL-TLS-Server
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working-directory: wrapper/CSharp/wolfSSL-TLS-Server
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run: msbuild wolfSSL-TLS-Server.csproj /p:TargetFrameworkVersion=v3.5
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- name: Build wolfSSL-TLS-ServerThreaded
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working-directory: wrapper/CSharp/wolfSSL-TLS-ServerThreaded
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run: msbuild wolfSSL-TLS-ServerThreaded.csproj /p:TargetFrameworkVersion=v3.5
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# TLS PSK
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- name: Build wolfSSL-TLS-PSK-Client
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working-directory: wrapper/CSharp/wolfSSL-TLS-PSK-Client
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run: msbuild wolfSSL-TLS-PSK-Client.csproj /p:TargetFrameworkVersion=v3.5
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- name: Build wolfSSL-TLS-PSK-Server
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working-directory: wrapper/CSharp/wolfSSL-TLS-PSK-Server
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run: msbuild wolfSSL-TLS-PSK-Server.csproj /p:TargetFrameworkVersion=v3.5
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# Example-IOCallbacks
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- name: Build wolfSSL-Example-IOCallbacks
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working-directory: wrapper/CSharp/wolfSSL-Example-IOCallbacks
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run: msbuild wolfSSL-Example-IOCallbacks.csproj /p:TargetFrameworkVersion=v3.5

‎wolfssl/sniffer.h

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#include <wolfssl/wolfcrypt/wolfevent.h>
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#endif
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#ifdef _WIN32
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#ifdef SSL_SNIFFER_EXPORTS
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#define SSL_SNIFFER_API __declspec(dllexport)
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#else
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#define SSL_SNIFFER_API __declspec(dllimport)
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#define SSL_SNIFFER_API
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#endif
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#else
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#define SSL_SNIFFER_API

‎wolfssl/wolfcrypt/curve25519.h

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@@ -165,7 +165,6 @@ curve25519_key* wc_curve25519_new(void* heap, int devId, int *result_code);
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WOLFSSL_API
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int wc_curve25519_delete(curve25519_key* key, curve25519_key** key_p);
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#endif
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WOLFSSL_API
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/* raw key helpers */
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WOLFSSL_API

‎wolfssl/wolfcrypt/ed25519.h

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WOLFSSL_API
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int wc_ed25519_delete(ed25519_key* key, ed25519_key** key_p);
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#endif
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WOLFSSL_API
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#ifdef HAVE_ED25519_KEY_IMPORT
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WOLFSSL_API

‎wrapper/CSharp/README.md

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Select the CPU type, configuration, and target file.
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select `Build` and either `Rebuild Solution` or `Build Solution`.
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### Visual Studio Build Configurations
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In addition to the Configuration and Platform build options, Visual Studio has a `Platform Toolset` option in the (C not C#) `wolfssl` project file.
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This can be found in the (Right-click on wolfssl project) `Property pages - General`.
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A missing Platform Toolset is assumed to be Visual Studio 2010. Click the drop-down to see options available.
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```text
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<PropertyGroup Condition ...
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<PlatformToolset>v143</PlatformToolset>
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```
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| Visual Studio Version | Internal Version | Platform Toolset |
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|-----------------------|------------------|------------------|
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| Visual Studio 2010 | 10.0 | v100 |
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| Visual Studio 2012 | 11.0 | v110 |
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| Visual Studio 2013 | 12.0 | v120 |
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| Visual Studio 2015 | 14.0 | v140 |
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| Visual Studio 2017 | 15.0 | v141 |
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| Visual Studio 2019 | 16.0 | v142 |
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| Visual Studio 2022 | 17.0 | v143 |
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The `wolfssl` C project can also have the Toolset modified by right-clicking on the project and selecting "Retarget Projects".
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Retargeting typically only offers to upgrade to the latest Platform Toolset, so the `wolfssl.vcxproj` file
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will need to be manually edited if older versions are required.
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### Debugging Native Code
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Right-click on the `wolfSSL_CSharp` project, select `Properties` and
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navigate to the `Debug` panel.
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Be sure to check the box under `Debugger engines`: [x] `Enable native code debugging`.
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This will allow single-step debugging into the native wolfSSL C library.
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Do this also for the startup project being debugged.
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If the error `Interop debugging is not supported` is encountered,
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check which version of the .NET framework is being used.
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Only 4.x or later supports native code debugging from a C# app.
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See also:
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https://learn.microsoft.com/en-us/visualstudio/debugger/debugging-native-code
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### Calling Convention
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The wolfSSL functions are wrapped like this:
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```
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[DllImport(wolfssl_dll, CallingConvention = CallingConvention.Cdecl)]
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private extern static int wolfSSL_Init();
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```
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Where `wolfssl_dll` is a constant compile-time string that points to the `wolfssl.dll` file.
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### Troubleshooting Windows DLL
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The `wolfssl.dll` file is created with the `DLL Debug` and `DLL Release` configurations
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and is typically compiled to:
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```
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C:\workspace\wolfssl-%USERNAME$\wrapper\CSharp\Debug\x64\wolfssl.dll
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```
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From a developer command prompt:
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```
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dumpbin /EXPORTS C:\workspace\wolfssl-$USER\wrapper\CSharp\Debug\x64\wolfssl.dll
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```
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There should be a long list of functions. If not, be sure to build with `WOLFSSL_DLL` (should be automatically included with DLL Debug/Release configurations).
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See the project file `PreprocessorDefinitions` section:
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```
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<PreprocessorDefinitions>BUILDING_WOLFSSL;WOLFSSL_DLL;WOLFSSL_USER_SETTINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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```
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If wolfSSL was _not_ compiled with `WOLFSSL_DLL` the `Unable to find an entry point` will be encountered:
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```
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wolfssl init error System.EntryPointNotFoundException: Unable to find an entry point named 'wolfSSL_Init' in DLL 'wolfssl.dll'.
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at wolfSSL.CSharp.wolfssl.wolfSSL_Init()
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at wolfSSL.CSharp.wolfssl.Init() in C:\workspace\wolfssl-%USERNAME%\wrapper\CSharp\wolfSSL_CSharp\wolfSSL.cs:line nnn
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Calling ctx Init from wolfSSL
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```
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Note the `WOLFSSL_DLL` is used in the wolfssl `wolfssl/wolfssl/wolfcrypt/visibility.h` and defines the `WOLFSSL_API` like this:
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```
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#define WOLFSSL_API __declspec(dllexport)
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```
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Only the wolfSSL function declarations decorated with this tag will be visible ion the DLL.
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#### Finding the wolfssl.dll
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The most common problem encountered on Windows is the DLL location.
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If not developing wolfSSL for Windows, one option is to copy the `wolfssl.dll` to `C:\Windows\System32\`.
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Another option is to add to the system environment path or your user environment path:
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```
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set PATH=%PATH%;C:\path\to\your\wolfssl.dll
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```
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#### Check Architecture (x86 vs x64)
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Your C# application must match the architecture of wolfssl.dll:
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- If your C# app is x64, wolfssl.dll must be 64-bit.
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- If your C# app is x86, wolfssl.dll must be 32-bit.
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#### Ensure wolfssl.dll is Unblocked
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If you downloaded wolfssl.dll from the Internet, Windows may block it.
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Right-click wolfssl.dll, go to Properties, and check Unblock under Security.
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## Linux (Ubuntu) using WSL
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The Microsoft Windows Subsystem for Linux cam be used for wolfSSL.
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```bash
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sudo
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sudo apt-get update
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sudo apt-get upgrade
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sudo apt install -y build-essential autoconf automake libtool pkg-config
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export WORKSPACE="/mnt/c/workspace"
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export WOLFSSL_ROOT="$WORKSPACE/wolfssl-$USER"
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cd "WOLFSSL_ROOT"
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```
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When using a git repository, run `autogen.sh`:
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```
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cd "$WOLFSSL_ROOT"
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./autogen.sh
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```
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### Build wolfSSL and install it system-wide
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To have a single instance of wolfSSL:
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```
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./configure
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make
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make check # (optional, but highly recommended)
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sudo make install
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```
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### Build wolfSSL and install to arbitrary directory
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To have an isolated instance of wolfSSL, in this case `$HOME/wolfssl-install-psk`:
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```bash
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make clean
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make distclean
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rm -rf "$HOME/wolfssl-install-psk"
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./configure --enable-all --disable-crypttests \
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--disable-examples \
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--enable-opensslall --enable-opensslextra \
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--enable-tls13 --enable-dtls13 --enable-dtls --enable-psk \
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CFLAGS="-DWOLFSSL_STATIC_PSK" --enable-shared \
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--prefix="$HOME/wolfssl-install-psk"
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make -j$(nproc)
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make install
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```
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### Compile specific example in WSL
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```bash
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# Optionally fetch additional examples
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git clone https://github.com/wolfSSL/wolfssl-examples.git "$WORKSPACE/wolfssl-examples-$USER"
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cd "$WORKSPACE/wolfssl-examples-$USER"
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THIS_EXAMPLE="client-dtls-psk"
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export WOLFSSL_DIR="$HOME/wolfssl-install-psk"
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export CFLAGS="-I$WOLFSSL_DIR/include"
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export LDFLAGS="-L$WOLFSSL_DIR/lib"
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export LD_LIBRARY_PATH="$HOME/wolfssl-install-psk/lib:$LD_LIBRARY_PATH"
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gcc -o "$THIS_EXAMPLE" "$THIS_EXAMPLE".c \
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-I$HOME/wolfssl-install-psk/include \
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-L$HOME/wolfssl-install-psk/lib -Wl,-rpath=$HOME/wolfssl-install-psk/lib -lwolfssl -lm
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```
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## Linux (Ubuntu) using mono
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Prerequisites for linux:
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```
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```bash
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apt-get update
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apt-get upgrade
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apt-get install mono-complete
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```
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### Build wolfSSL and install
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### Build wolfSSL and install system-wide
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```
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```bash
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./autogen.sh
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./configure --enable-keygen --enable-eccencrypt --enable-ed25519 --enable-curve25519 --enable-aesgcm
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make
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From the `wrapper/CSharp` directory (`cd wrapper/CSharp`):
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Compile wolfCrypt test:
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Compile wolfCrypt test with mono:
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```
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```bash
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mcs wolfCrypt-Test/wolfCrypt-Test.cs wolfSSL_CSharp/wolfCrypt.cs -OUT:wolfcrypttest.exe
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mono wolfcrypttest.exe
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```
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From the `wrapper/CSharp` directory (`cd wrapper/CSharp`):
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Compile server:
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Compile server with mono:
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```
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```bash
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mcs wolfSSL_CSharp/wolfSSL.cs wolfSSL_CSharp/X509.cs wolfSSL-TLS-Server/wolfSSL-TLS-Server.cs -OUT:server.exe
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```
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Compile client:
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Compile client with mono:
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```
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```bash
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mcs wolfSSL_CSharp/wolfSSL.cs wolfSSL_CSharp/X509.cs wolfSSL-TLS-Client/wolfSSL-TLS-Client.cs -OUT:client.exe
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```
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‎wrapper/CSharp/cpp.hint

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// Hint files help the Visual Studio IDE interpret Visual C++ identifiers
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// such as names of functions and macros.
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// For more information see https://go.microsoft.com/fwlink/?linkid=865984
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#define WOLFSSL_API
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#define WOLFSSL_API __declspec(dllexport)
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#define WOLFSSL_API __attribute__ ((visibility("default")))
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‎wrapper/CSharp/include.am

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# wolfSSL CSharp wrapper files
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EXTRA_DIST+= wrapper/CSharp/cpp.hint
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EXTRA_DIST+= wrapper/CSharp/README.md
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EXTRA_DIST+= wrapper/CSharp/wolfSSL-DTLS-PSK-Server/App.config
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EXTRA_DIST+= wrapper/CSharp/wolfSSL-DTLS-PSK-Server/Properties/AssemblyInfo.cs
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EXTRA_DIST+= wrapper/CSharp/wolfCrypt-Test/Properties/AssemblyInfo.cs
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EXTRA_DIST+= wrapper/CSharp/wolfCrypt-Test/wolfCrypt-Test.cs
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EXTRA_DIST+= wrapper/CSharp/wolfCrypt-Test/wolfCrypt-Test.csproj
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EXTRA_DIST+= wrapper/CSharp/wolfssl_clients/wolfSSL_CSharp-Clients.sln

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