@@ -260,7 +260,7 @@ jobs:
       free-threading: ${{ matrix.free-threading }}
       os: ${{ matrix.os }}
 
-  build-ubuntu-ssltests:
+  build-ubuntu-ssltests-openssl:
     name: 'Ubuntu SSL tests with OpenSSL'
     runs-on: ${{ matrix.os }}
     timeout-minutes: 60
@@ -322,6 +322,81 @@ jobs:
     - name: SSL tests
       run: ./python Lib/test/ssltests.py
 
+  build-ubuntu-ssltests-awslc:
+    name: 'Ubuntu SSL tests with AWS-LC'
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 60
+    needs: build-context
+    if: needs.build-context.outputs.run-tests == 'true'
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-24.04]
+        awslc_ver: [1.55.0]
+    env:
+      AWSLC_VER: ${{ matrix.awslc_ver}}
+      MULTISSL_DIR: ${{ github.workspace }}/multissl
+      OPENSSL_DIR: ${{ github.workspace }}/multissl/aws-lc/${{ matrix.awslc_ver }}
+      LD_LIBRARY_PATH: ${{ github.workspace }}/multissl/aws-lc/${{ matrix.awslc_ver }}/lib
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        persist-credentials: false
+    - name: Runner image version
+      run: echo "IMAGE_OS_VERSION=${ImageOS}-${ImageVersion}" >> "$GITHUB_ENV"
+    - name: Restore config.cache
+      uses: actions/cache@v4
+      with:
+        path: config.cache
+        key: ${{ github.job }}-${{ env.IMAGE_OS_VERSION }}-${{ needs.build-context.outputs.config-hash }}
+    - name: Register gcc problem matcher
+      run: echo "::add-matcher::.github/problem-matchers/gcc.json"
+    - name: Install dependencies
+      run: sudo ./.github/workflows/posix-deps-apt.sh
+    - name: Configure SSL lib env vars
+      run: |
+        echo "MULTISSL_DIR=${GITHUB_WORKSPACE}/multissl" >> "$GITHUB_ENV"
+        echo "OPENSSL_DIR=${GITHUB_WORKSPACE}/multissl/aws-lc/${AWSLC_VER}" >> "$GITHUB_ENV"
+        echo "LD_LIBRARY_PATH=${GITHUB_WORKSPACE}/multissl/aws-lc/${AWSLC_VER}/lib" >> "$GITHUB_ENV"
+    - name: 'Restore AWS-LC build'
+      id: cache-aws-lc
+      uses: actions/cache@v4
+      with:
+        path: ./multissl/aws-lc/${{ matrix.awslc_ver }}
+        key: ${{ matrix.os }}-multissl-aws-lc-${{ matrix.awslc_ver }}
+    - name: Install AWS-LC
+      if: steps.cache-aws-lc.outputs.cache-hit != 'true'
+      run: |
+        python3 Tools/ssl/multissltests.py \
+          --steps=library \
+          --base-directory "$MULTISSL_DIR" \
+          --awslc ${{ matrix.awslc_ver }} \
+          --system Linux
+    - name: Add ccache to PATH
+      run: |
+        echo "PATH=/usr/lib/ccache:$PATH" >> "$GITHUB_ENV"
+    - name: Configure ccache action
+      uses: hendrikmuhs/ccache-action@v1.2
+      with:
+        save: false
+    - name: Configure CPython
+      run: |
+        ./configure CFLAGS="-fdiagnostics-format=json" \
+          --config-cache \
+          --enable-slower-safety \
+          --with-pydebug \
+          --with-openssl="$OPENSSL_DIR" \
+          --with-builtin-hashlib-hashes=blake2 \
+          --with-ssl-default-suites=openssl
+    - name: Build CPython
+      run: make -j
+    - name: Display build info
+      run: make pythoninfo
+    - name: Verify python is linked to AWS-LC
+      run: ./python -c 'import ssl; print(ssl.OPENSSL_VERSION)' | grep AWS-LC
+    - name: SSL tests
+      run: ./python Lib/test/ssltests.py
+
   build-wasi:
     name: 'WASI'
     needs: build-context
@@ -628,7 +703,8 @@ jobs:
     - build-windows-msi
     - build-macos
     - build-ubuntu
-    - build-ubuntu-ssltests
+    - build-ubuntu-ssltests-awslc
+    - build-ubuntu-ssltests-openssl
     - build-wasi
     - test-hypothesis
     - build-asan
@@ -643,7 +719,8 @@ jobs:
       with:
         allowed-failures: >-
           build-windows-msi,
-          build-ubuntu-ssltests,
+          build-ubuntu-ssltests-awslc,
+          build-ubuntu-ssltests-openssl,
           test-hypothesis,
           cifuzz,
         allowed-skips: >-
@@ -661,7 +738,8 @@ jobs:
             check-generated-files,
             build-macos,
             build-ubuntu,
-            build-ubuntu-ssltests,
+            build-ubuntu-ssltests-awslc,
+            build-ubuntu-ssltests-openssl,
             build-wasi,
             test-hypothesis,
             build-asan,
 
@@ -5,6 +5,7 @@ apt-get -yq install \
     build-essential \
     pkg-config \
     ccache \
+    cmake \
     gdb \
     lcov \
     libb2-dev \
 
@@ -0,0 +1 @@
+Add a new GitHub CI job to test the :mod:`ssl` module with `AWS-LC <https://github.com/aws/aws-lc>`_ as the backing cryptography and TLS library.
@@ -1,12 +1,12 @@
 #!./python
-"""Run Python tests against multiple installations of OpenSSL and LibreSSL
+"""Run Python tests against multiple installations of cryptography libraries
 
 The script
 
-  (1) downloads OpenSSL / LibreSSL tar bundle
+  (1) downloads the tar bundle
   (2) extracts it to ./src
-  (3) compiles OpenSSL / LibreSSL
-  (4) installs OpenSSL / LibreSSL into ../multissl/$LIB/$VERSION/
+  (3) compiles the relevant library
+  (4) installs that library into ../multissl/$LIB/$VERSION/
   (5) forces a recompilation of Python modules using the
       header and library files from ../multissl/$LIB/$VERSION/
   (6) runs Python's test suite
@@ -61,6 +61,10 @@
 LIBRESSL_RECENT_VERSIONS = [
 ]
 
+AWSLC_RECENT_VERSIONS = [
+    "1.55.0",
+]
+
 # store files in ../multissl
 HERE = os.path.dirname(os.path.abspath(__file__))
 PYTHONROOT = os.path.abspath(os.path.join(HERE, '..', '..'))
@@ -70,9 +74,9 @@
 parser = argparse.ArgumentParser(
     prog='multissl',
     description=(
-        "Run CPython tests with multiple OpenSSL and LibreSSL "
+        "Run CPython tests with multiple cryptography libraries"
         "versions."
-    )
+    ),
 )
 parser.add_argument(
     '--debug',
@@ -102,6 +106,14 @@
         "OpenSSL and LibreSSL versions are given."
     ).format(LIBRESSL_RECENT_VERSIONS, LIBRESSL_OLD_VERSIONS)
 )
+parser.add_argument(
+    '--awslc',
+    nargs='+',
+    default=(),
+    help=(
+        "AWS-LC versions, defaults to '{}' if no crypto library versions are given."
+    ).format(AWSLC_RECENT_VERSIONS)
+)
 parser.add_argument(
     '--tests',
     nargs='*',
@@ -111,7 +123,7 @@
 parser.add_argument(
     '--base-directory',
     default=MULTISSL_DIR,
-    help="Base directory for OpenSSL / LibreSSL sources and builds."
+    help="Base directory for crypto library sources and builds."
 )
 parser.add_argument(
     '--no-network',
@@ -124,8 +136,8 @@
     choices=['library', 'modules', 'tests'],
     default='tests',
     help=(
-        "Which steps to perform. 'library' downloads and compiles OpenSSL "
-        "or LibreSSL. 'module' also compiles Python modules. 'tests' builds "
+        "Which steps to perform. 'library' downloads and compiles a crypto"
+        "library. 'module' also compiles Python modules. 'tests' builds "
         "all and runs the test suite."
     )
 )
@@ -453,6 +465,34 @@ class BuildLibreSSL(AbstractBuilder):
     build_template = "libressl-{}"
 
 
+class BuildAWSLC(AbstractBuilder):
+    library = "AWS-LC"
+    url_templates = (
+        "https://github.com/aws/aws-lc/archive/refs/tags/v{v}.tar.gz",
+    )
+    src_template = "aws-lc-{}.tar.gz"
+    build_template = "aws-lc-{}"
+
+    def _build_src(self, config_args=()):
+        cwd = self.build_dir
+        log.info("Running build in {}".format(cwd))
+        env = os.environ.copy()
+        env["LD_RUN_PATH"] = self.lib_dir # set rpath
+        if self.system:
+            env['SYSTEM'] = self.system
+        cmd = [
+            "cmake",
+            "-DCMAKE_BUILD_TYPE=RelWithDebInfo",
+            "-DCMAKE_PREFIX_PATH={}".format(self.install_dir),
+            "-DCMAKE_INSTALL_PREFIX={}".format(self.install_dir),
+            "-DBUILD_SHARED_LIBS=ON",
+            "-DBUILD_TESTING=OFF",
+            "-DFIPS=OFF",
+        ]
+        self._subprocess_call(cmd, cwd=cwd, env=env)
+        self._subprocess_call(["make", "-j{}".format(self.jobs)], cwd=cwd, env=env)
+
+
 def configure_make():
     if not os.path.isfile('Makefile'):
         log.info('Running ./configure')
@@ -467,9 +507,10 @@ def configure_make():
 
 def main():
     args = parser.parse_args()
-    if not args.openssl and not args.libressl:
+    if not args.openssl and not args.libressl and not args.awslc:
         args.openssl = list(OPENSSL_RECENT_VERSIONS)
         args.libressl = list(LIBRESSL_RECENT_VERSIONS)
+        args.awslc = list(AWSLC_RECENT_VERSIONS)
         if not args.disable_ancient:
             args.openssl.extend(OPENSSL_OLD_VERSIONS)
             args.libressl.extend(LIBRESSL_OLD_VERSIONS)
@@ -496,22 +537,15 @@ def main():
 
     # download and register builder
     builds = []
-
-    for version in args.openssl:
-        build = BuildOpenSSL(
-            version,
-            args
-        )
-        build.install()
-        builds.append(build)
-
-    for version in args.libressl:
-        build = BuildLibreSSL(
-            version,
-            args
-        )
-        build.install()
-        builds.append(build)
+    for build_class, versions in [
+        (BuildOpenSSL, args.openssl),
+        (BuildLibreSSL, args.libressl),
+        (BuildAWSLC, args.awslc),
+    ]:
+        for version in versions:
+            build = build_class(version, args)
+            build.install()
+            builds.append(build)
 
     if args.steps in {'modules', 'tests'}:
         for build in builds:
@@ -539,7 +573,7 @@ def main():
         else:
             print('Executed all SSL tests.')
 
-    print('OpenSSL / LibreSSL versions:')
+    print('OpenSSL / LibreSSL / AWS-LC versions:')
     for build in builds:
         print("    * {0.library} {0.version}".format(build))
 
 
@@ -7529,8 +7529,8 @@ WITH_SAVE_ENV([
     ], [
       OBJ_nid2sn(NID_md5);
       OBJ_nid2sn(NID_sha1);
+      OBJ_nid2sn(NID_sha512);
       OBJ_nid2sn(NID_sha3_512);
-      OBJ_nid2sn(NID_blake2b512);
       EVP_PBE_scrypt(NULL, 0, NULL, 0, 2, 8, 1, 0, NULL, 0);
     ])], [ac_cv_working_openssl_hashlib=yes], [ac_cv_working_openssl_hashlib=no])
   ])
Original file line number	Diff line number	Diff line change
@@ -0,0 +1 @@
	1	+ Add a new GitHub CI job to test the :mod:`ssl` module with `AWS-LC <https://github.com/aws/aws-lc>`_ as the backing cryptography and TLS library.