Attempt to enable OpenSSL legacy provider on Windows

Author: ronf

.github/workflows/run_tests.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-2022]
+        os: [ubuntu-latest, macos-latest, windows-latest]
         python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
         include:
           - os: macos-latest
@@ -35,6 +35,24 @@ jobs:
       nettle_version: nettle_3.8.1_release_20220727
 
     steps:
+      - name: Enable OpenSSL legacy provider (Windows)
+        if: ${{ runner.os == 'Windows' }}
+        shell: pwsh
+        run: |
+          @"
+          openssl_conf = openssl_init
+          [openssl_init]
+          providers = provider_sect
+          [provider_sect]
+          default = default_sect
+          legacy = legacy_sect
+          [default_sect]
+          activate = 1
+          [legacy_sect]
+          activate = 1
+          "@ | Out-File -FilePath ($env:RUNNER_TEMP + "\openssl.cnf") -Encoding utf8
+          echo "OPENSSL_CONF=$env:RUNNER_TEMP\openssl.cnf" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+
       - name: Checkout asyncssh
         uses: actions/checkout@v4
         with: