awslabs · DmitriyMusatkin · Apr 16, 2026 · Jan 13, 2026 · Apr 3, 2026 · Apr 3, 2026
diff --git a/awscrt/s3.py b/awscrt/s3.py
@@ -106,6 +106,18 @@ class S3ChecksumAlgorithm(IntEnum):
     CRC64NVME = 5
     """CRC64NVME"""
 
+    SHA512 = 6,
+    """SHA512"""
+
+    XXHASH64 = 7,
+    """XXHASH64"""
+
+    XXHASH3 = 8,
+    """XXHASH3"""
+
+    XXHASH128 = 9,
+    """XXHASH128"""
+
 
 class S3ChecksumLocation(IntEnum):
     """Where to put the checksum."""

diff --git a/crt/aws-c-http b/crt/aws-c-http
diff --git a/crt/aws-c-s3 b/crt/aws-c-s3
diff --git a/crt/s2n b/crt/s2n
diff --git a/setup.py b/setup.py
@@ -451,6 +451,7 @@ def awscrt_ext():
     extra_objects = []
     define_macros = []
     py_limited_api = False
+    has_gil = True
 
     libraries = [x.libname for x in AWS_LIBS]
 
@@ -537,6 +538,9 @@ def awscrt_ext():
                 else:
                     extra_link_args += ['-Wl,--fatal-warnings']
 
+    if hasattr(sys, '_is_gil_enabled'):
+        has_gil = sys._is_gil_enabled()
+
     # prefer building with stable ABI, so a wheel can work with multiple major versions
     if FREE_THREADED_BUILD and sys.version_info[:2] <= (3, 14):
         # 3.14 free threaded (aka no gil) does not support limited api.
+160 −2		bin/elasticurl/main.c
+1 −0		include/aws/http/http.h
+20 −1		include/aws/http/private/h1_encoder.h
+30 −0		include/aws/http/private/h1_stream.h
+1 −3		include/aws/http/private/request_response_impl.h
+101 −25		include/aws/http/request_response.h
+16 −4		source/h1_connection.c
+184 −8		source/h1_encoder.c
+177 −2		source/h1_stream.c
+6 −5		source/h2_stream.c
+3 −0		source/http.c
+17 −2		source/request_response.c
+15 −0		tests/CMakeLists.txt
+1 −0		tests/stream_test_helper.c
+1 −0		tests/stream_test_helper.h
+595 −1		tests/test_h1_client.c
+12 −6		tests/test_h1_encoder.c
+110 −2		tests/test_h2_client.c
+10 −1		include/aws/s3/private/s3_checksums.h
+6 −2		include/aws/s3/s3_client.h
+144 −6		source/s3_checksums.c
+35 −40		source/s3_default_buffer_pool.c
+8 −0		source/s3_meta_request.c
+15 −0		tests/CMakeLists.txt
+235 −0		tests/s3_checksums_sha512_tests.c
+48 −0		tests/s3_checksums_xxhash_tests.c
+2 −0		tests/s3_data_plane_tests.c
+69 −0		tests/s3_default_buffer_pool_tests.c