diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 0201615..c20e122 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -7,40 +7,16 @@
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        # os: [ubuntu-18.04, windows-2019, macos-10.15]
-        os: [ubuntu-18.04, windows-2019]
+        os: [windows-2019]
         USE_MBEDTLS: ["ON", "OFF"]
         USE_CONTEXT: ["ON", "OFF"]
         CMAKE_OPTIONS:
           [
             "-DCOSE_C_INCLUDE_ENCRYPT=ON -DCOSE_C_INCLUDE_ENCRYPT0=OFF -DCOSE_C_INCLUDE_MAC0=OFF -DCOSE_C_INCLUDE_MAC=OFF -DCOSE_C_INCLUDE_SIGN=OFF -DCOSE_C_INCLUDE_SIGN1=OFF -DCOSE_C_INCLUDE_COUNTERSIGN=OFF",
-            "-DCOSE_C_INCLUDE_ENCRYPT=OFF -DCOSE_C_INCLUDE_ENCRYPT0=ON -DCOSE_C_INCLUDE_MAC0=OFF -DCOSE_C_INCLUDE_MAC=OFF -DCOSE_C_INCLUDE_SIGN=OFF -DCOSE_C_INCLUDE_SIGN1=OFF -DCOSE_C_INCLUDE_COUNTERSIGN=OFF",
-            "-DCOSE_C_INCLUDE_ENCRYPT=OFF -DCOSE_C_INCLUDE_ENCRYPT0=OFF -DCOSE_C_INCLUDE_MAC0=ON -DCOSE_C_INCLUDE_MAC=OFF -DCOSE_C_INCLUDE_SIGN=OFF -DCOSE_C_INCLUDE_SIGN1=OFF -DCOSE_C_INCLUDE_COUNTERSIGN=OFF",
-            "-DCOSE_C_INCLUDE_ENCRYPT=OFF -DCOSE_C_INCLUDE_ENCRYPT0=OFF -DCOSE_C_INCLUDE_MAC0=OFF -DCOSE_C_INCLUDE_MAC=ON -DCOSE_C_INCLUDE_SIGN=OFF -DCOSE_C_INCLUDE_SIGN1=OFF -DCOSE_C_INCLUDE_COUNTERSIGN=OFF",
-            "-DCOSE_C_INCLUDE_ENCRYPT=OFF -DCOSE_C_INCLUDE_ENCRYPT0=OFF -DCOSE_C_INCLUDE_MAC0=OFF -DCOSE_C_INCLUDE_MAC=OFF -DCOSE_C_INCLUDE_SIGN=ON -DCOSE_C_INCLUDE_SIGN1=OFF -DCOSE_C_INCLUDE_COUNTERSIGN=OFF",
-            "-DCOSE_C_INCLUDE_ENCRYPT=OFF -DCOSE_C_INCLUDE_ENCRYPT0=OFF -DCOSE_C_INCLUDE_MAC0=OFF -DCOSE_C_INCLUDE_MAC=OFF -DCOSE_C_INCLUDE_SIGN=OFF -DCOSE_C_INCLUDE_SIGN1=ON -DCOSE_C_INCLUDE_COUNTERSIGN=OFF",
-            "-DCOSE_C_INCLUDE_ENCRYPT=ON -DCOSE_C_INCLUDE_ENCRYPT0=OFF -DCOSE_C_INCLUDE_MAC0=OFF -DCOSE_C_INCLUDE_MAC=OFF -DCOSE_C_INCLUDE_SIGN=OFF -DCOSE_C_INCLUDE_SIGN1=OFF -DCOSE_C_INCLUDE_COUNTERSIGN=ON",
-            "-DCOSE_C_INCLUDE_ENCRYPT=OFF -DCOSE_C_INCLUDE_ENCRYPT0=ON -DCOSE_C_INCLUDE_MAC0=OFF -DCOSE_C_INCLUDE_MAC=OFF -DCOSE_C_INCLUDE_SIGN=OFF -DCOSE_C_INCLUDE_SIGN1=OFF -DCOSE_C_INCLUDE_COUNTERSIGN=ON",
-            "-DCOSE_C_INCLUDE_ENCRYPT=OFF -DCOSE_C_INCLUDE_ENCRYPT0=OFF -DCOSE_C_INCLUDE_MAC0=ON -DCOSE_C_INCLUDE_MAC=OFF -DCOSE_C_INCLUDE_SIGN=OFF -DCOSE_C_INCLUDE_SIGN1=OFF -DCOSE_C_INCLUDE_COUNTERSIGN=ON",
-            "-DCOSE_C_INCLUDE_ENCRYPT=OFF -DCOSE_C_INCLUDE_ENCRYPT0=OFF -DCOSE_C_INCLUDE_MAC0=OFF -DCOSE_C_INCLUDE_MAC=ON -DCOSE_C_INCLUDE_SIGN=OFF -DCOSE_C_INCLUDE_SIGN1=OFF -DCOSE_C_INCLUDE_COUNTERSIGN=ON",
-            "-DCOSE_C_INCLUDE_ENCRYPT=OFF -DCOSE_C_INCLUDE_ENCRYPT0=OFF -DCOSE_C_INCLUDE_MAC0=OFF -DCOSE_C_INCLUDE_MAC=OFF -DCOSE_C_INCLUDE_SIGN=ON -DCOSE_C_INCLUDE_SIGN1=OFF -DCOSE_C_INCLUDE_COUNTERSIGN=ON",
-            "-DCOSE_C_INCLUDE_ENCRYPT=OFF -DCOSE_C_INCLUDE_ENCRYPT0=OFF -DCOSE_C_INCLUDE_MAC0=OFF -DCOSE_C_INCLUDE_MAC=OFF -DCOSE_C_INCLUDE_SIGN=OFF -DCOSE_C_INCLUDE_SIGN1=ON -DCOSE_C_INCLUDE_COUNTERSIGN=ON",
-            "-DCOSE_C_OPTIMIZE=ON -DCOSE_C_INCLUDE_COUNTERSIGN=ON"
           ]
 
     steps:
       - uses: actions/checkout@v1
-      - name: setup (linux)
-        if: startsWith(matrix.os, 'ubuntu')
-        run: |
-          sudo apt install cmake-data
-
-      # - name: setup (mac)
-      #   if: startsWith(matrix.os, 'macos')
-      #   run: |
-      #     brew update
-      #     brew upgrade
-      #     brew install cmake openssl
 
       - name: setup (windows)
         if: startsWith(matrix.os, 'windows')
@@ -69,68 +45,19 @@
         run: cmake --build .
 
       - name: get test data
-        if: startsWith(matrix.os, 'ubuntu')
         working-directory: ${{runner.workspace}}
         shell: bash
         run: |
+          echo $GITHUB_WORKSPACE
+          pwd
           cd $GITHUB_WORKSPACE
+          pwd
           git clone --depth 1 git://github.com/cose-wg/Examples Examples
+          ls -al
 
       - name: Test
-        if: startsWith(matrix.os, 'ubuntu')
         working-directory: ${{runner.workspace}}/build
         shell: bash
         run: |
           ctest --verbose
 
-  clang-tidy:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [ubuntu-latest]
-        USE_MBEDTLS: ["ON", "OFF"]
-        USE_CONTEXT: ["ON", "OFF"]
-        CMAKE_OPTIONS:
-          [
-            "-DCOSE_C_INCLUDE_ENCRYPT=ON -DCOSE_C_INCLUDE_ENCRYPT0=OFF -DCOSE_C_INCLUDE_MAC0=OFF -DCOSE_C_INCLUDE_MAC=OFF -DCOSE_C_INCLUDE_SIGN=OFF -DCOSE_C_INCLUDE_SIGN1=OFF -DCOSE_C_INCLUDE_COUNTERSIGN=OFF",
-            "-DCOSE_C_INCLUDE_ENCRYPT=OFF -DCOSE_C_INCLUDE_ENCRYPT0=ON -DCOSE_C_INCLUDE_MAC0=OFF -DCOSE_C_INCLUDE_MAC=OFF -DCOSE_C_INCLUDE_SIGN=OFF -DCOSE_C_INCLUDE_SIGN1=OFF -DCOSE_C_INCLUDE_COUNTERSIGN=OFF",
-            "-DCOSE_C_INCLUDE_ENCRYPT=OFF -DCOSE_C_INCLUDE_ENCRYPT0=OFF -DCOSE_C_INCLUDE_MAC0=ON -DCOSE_C_INCLUDE_MAC=OFF -DCOSE_C_INCLUDE_SIGN=OFF -DCOSE_C_INCLUDE_SIGN1=OFF -DCOSE_C_INCLUDE_COUNTERSIGN=OFF",
-            "-DCOSE_C_INCLUDE_ENCRYPT=OFF -DCOSE_C_INCLUDE_ENCRYPT0=OFF -DCOSE_C_INCLUDE_MAC0=OFF -DCOSE_C_INCLUDE_MAC=ON -DCOSE_C_INCLUDE_SIGN=OFF -DCOSE_C_INCLUDE_SIGN1=OFF -DCOSE_C_INCLUDE_COUNTERSIGN=OFF",
-            "-DCOSE_C_INCLUDE_ENCRYPT=OFF -DCOSE_C_INCLUDE_ENCRYPT0=OFF -DCOSE_C_INCLUDE_MAC0=OFF -DCOSE_C_INCLUDE_MAC=OFF -DCOSE_C_INCLUDE_SIGN=ON -DCOSE_C_INCLUDE_SIGN1=OFF -DCOSE_C_INCLUDE_COUNTERSIGN=OFF",
-            "-DCOSE_C_INCLUDE_ENCRYPT=OFF -DCOSE_C_INCLUDE_ENCRYPT0=OFF -DCOSE_C_INCLUDE_MAC0=OFF -DCOSE_C_INCLUDE_MAC=OFF -DCOSE_C_INCLUDE_SIGN=OFF -DCOSE_C_INCLUDE_SIGN1=ON -DCOSE_C_INCLUDE_COUNTERSIGN=OFF",
-            "-DCOSE_C_INCLUDE_ENCRYPT=ON -DCOSE_C_INCLUDE_ENCRYPT0=OFF -DCOSE_C_INCLUDE_MAC0=OFF -DCOSE_C_INCLUDE_MAC=OFF -DCOSE_C_INCLUDE_SIGN=OFF -DCOSE_C_INCLUDE_SIGN1=OFF -DCOSE_C_INCLUDE_COUNTERSIGN=ON",
-            "-DCOSE_C_INCLUDE_ENCRYPT=OFF -DCOSE_C_INCLUDE_ENCRYPT0=ON -DCOSE_C_INCLUDE_MAC0=OFF -DCOSE_C_INCLUDE_MAC=OFF -DCOSE_C_INCLUDE_SIGN=OFF -DCOSE_C_INCLUDE_SIGN1=OFF -DCOSE_C_INCLUDE_COUNTERSIGN=ON",
-            "-DCOSE_C_INCLUDE_ENCRYPT=OFF -DCOSE_C_INCLUDE_ENCRYPT0=OFF -DCOSE_C_INCLUDE_MAC0=ON -DCOSE_C_INCLUDE_MAC=OFF -DCOSE_C_INCLUDE_SIGN=OFF -DCOSE_C_INCLUDE_SIGN1=OFF -DCOSE_C_INCLUDE_COUNTERSIGN=ON",
-            "-DCOSE_C_INCLUDE_ENCRYPT=OFF -DCOSE_C_INCLUDE_ENCRYPT0=OFF -DCOSE_C_INCLUDE_MAC0=OFF -DCOSE_C_INCLUDE_MAC=ON -DCOSE_C_INCLUDE_SIGN=OFF -DCOSE_C_INCLUDE_SIGN1=OFF -DCOSE_C_INCLUDE_COUNTERSIGN=ON",
-            "-DCOSE_C_INCLUDE_ENCRYPT=OFF -DCOSE_C_INCLUDE_ENCRYPT0=OFF -DCOSE_C_INCLUDE_MAC0=OFF -DCOSE_C_INCLUDE_MAC=OFF -DCOSE_C_INCLUDE_SIGN=ON -DCOSE_C_INCLUDE_SIGN1=OFF -DCOSE_C_INCLUDE_COUNTERSIGN=ON",
-            "-DCOSE_C_INCLUDE_ENCRYPT=OFF -DCOSE_C_INCLUDE_ENCRYPT0=OFF -DCOSE_C_INCLUDE_MAC0=OFF -DCOSE_C_INCLUDE_MAC=OFF -DCOSE_C_INCLUDE_SIGN=OFF -DCOSE_C_INCLUDE_SIGN1=ON -DCOSE_C_INCLUDE_COUNTERSIGN=ON",
-          ]
-
-    steps:
-      - uses: actions/checkout@v1
-      - name: setup (linux)
-        if: startsWith(matrix.os, 'ubuntu')
-        run: |
-          sudo apt install cmake-data clang clang-tidy
-
-      - name: Create Build directory
-        run: cmake -E make_directory ${{runner.workspace}}/build
-
-      - name: Configure CMake
-        shell: bash
-        working-directory: ${{runner.workspace}}/build
-        run: |
-          export CC=clang && \
-          export CXX=clang++ && \
-          cmake $GITHUB_WORKSPACE \
-          -DCOSE_C_USE_CONTEXT=${{matrix.USE_CONTEXT}} \
-          -DCOSE_C_BUILD_DOCS=OFF \
-          -DCOSE_C_BUILD_TESTS=ON \
-          -DCOSE_C_RUN_CLANG_TIDY=ON \
-          ${{matrix.CMAKE_OPTIONS}} \
-          -DCOSE_C_USE_MBEDTLS=${{matrix.USE_MBEDTLS}}
-
-      - name: Build
-        working-directory: ${{runner.workspace}}/build
-        shell: bash
-        run: cmake --build .