Add initial CommonCrypto bindings (no backend yet)

cryptography/hazmat/bindings/commoncrypto/__init__.py

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+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.

cryptography/hazmat/bindings/commoncrypto/binding.py

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+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import absolute_import, division, print_function
+
+from cryptography.hazmat.bindings.utils import build_ffi
+
+
+class Binding(object):
+    """
+    CommonCrypto API wrapper.
+    """
+    _module_prefix = "cryptography.hazmat.bindings.commoncrypto."
+    _modules = [
+        "common_digest",
+    ]
+
+    ffi = None
+    lib = None
+
+    def __init__(self):
+        self._ensure_ffi_initialized()
+
+    @classmethod
+    def _ensure_ffi_initialized(cls):
+        if cls.ffi is not None and cls.lib is not None:
+            return
+
+        cls.ffi, cls.lib = build_ffi(cls._module_prefix, cls._modules,
+                                     "", "", [])

cryptography/hazmat/bindings/commoncrypto/common_digest.py

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+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+INCLUDES = """
+#include <CommonCrypto/CommonDigest.h>
+"""
+
+TYPES = """
+typedef uint32_t CC_LONG;
+typedef uint64_t CC_LONG64;
+typedef struct CC_MD5state_st {
+    ...;
+} CC_MD5_CTX;
+typedef struct CC_SHA1state_st {
+    ...;
+} CC_SHA1_CTX;
+typedef struct CC_SHA256state_st {
+    ...;
+} CC_SHA256_CTX;
+typedef struct CC_SHA512state_st {
+    ...;
+} CC_SHA512_CTX;
+"""
+
+FUNCTIONS = """
+int CC_MD5_Init(CC_MD5_CTX *);
+int CC_MD5_Update(CC_MD5_CTX *, const void *, CC_LONG);
+int CC_MD5_Final(unsigned char *, CC_MD5_CTX *);
+
+int CC_SHA1_Init(CC_SHA1_CTX *);
+int CC_SHA1_Update(CC_SHA1_CTX *, const void *, CC_LONG);
+int CC_SHA1_Final(unsigned char *, CC_SHA1_CTX *);
+
+int CC_SHA224_Init(CC_SHA256_CTX *);
+int CC_SHA224_Update(CC_SHA256_CTX *, const void *, CC_LONG);
+int CC_SHA224_Final(unsigned char *, CC_SHA256_CTX *);
+
+int CC_SHA256_Init(CC_SHA256_CTX *);
+int CC_SHA256_Update(CC_SHA256_CTX *, const void *, CC_LONG);
+int CC_SHA256_Final(unsigned char *, CC_SHA256_CTX *);
+
+int CC_SHA384_Init(CC_SHA512_CTX *);
+int CC_SHA384_Update(CC_SHA512_CTX *, const void *, CC_LONG);
+int CC_SHA384_Final(unsigned char *, CC_SHA512_CTX *);
+
+int CC_SHA512_Init(CC_SHA512_CTX *);
+int CC_SHA512_Update(CC_SHA512_CTX *, const void *, CC_LONG);
+int CC_SHA512_Final(unsigned char *, CC_SHA512_CTX *);
+"""
+
+MACROS = """
+"""
+
+CUSTOMIZATIONS = """
+"""
+
+CONDITIONAL_NAMES = {}

tests/hazmat/bindings/test_commoncrypto.py

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+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import pytest
+
+from cryptography.hazmat.bindings.commoncrypto.binding import Binding
+
+
+@pytest.mark.commoncrypto
+class TestCommonCrypto(object):
+    def test_binding_loads(self):
+        binding = Binding()
+        assert binding
+        assert binding.lib
+        assert binding.ffi