prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  Hasher.hexdigest() is documented as returning a str, but returns unicode under python2
  It should return a native string under boht py2 and py3
  
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `cryptography/primitives/hashes.py`
  Content:
  ```
  1 # Licensed under the Apache License, Version 2.0 (the "License");
  2 # you may not use this file except in compliance with the License.
  3 # You may obtain a copy of the License at
  4 #
  5 #    http://www.apache.org/licenses/LICENSE-2.0
  6 #
  7 # Unless required by applicable law or agreed to in writing, software
  8 # distributed under the License is distributed on an "AS IS" BASIS,
  9 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
  10 # implied.
  11 # See the License for the specific language governing permissions and
  12 # limitations under the License.
  13 
  14 from __future__ import absolute_import, division, print_function
  15 
  16 import abc
  17 
  18 import binascii
  19 
  20 import six
  21 
  22 from cryptography.bindings import _default_api
  23 
  24 
  25 class BaseHash(six.with_metaclass(abc.ABCMeta)):
  26     def __init__(self, data=None, api=None, ctx=None):
  27         if api is None:
  28             api = _default_api
  29         self._api = api
  30         self._ctx = self._api.create_hash_context(self) if ctx is None else ctx
  31         if data is not None:
  32             self.update(data)
  33 
  34     def update(self, data):
  35         if isinstance(data, six.text_type):
  36             raise TypeError("Unicode-objects must be encoded before hashing")
  37         self._api.update_hash_context(self._ctx, data)
  38 
  39     def copy(self):
  40         return self.__class__(ctx=self._copy_ctx())
  41 
  42     def digest(self):
  43         return self._api.finalize_hash_context(self._copy_ctx(),
  44                                                self.digest_size)
  45 
  46     def hexdigest(self):
  47         return binascii.hexlify(self.digest()).decode("ascii")
  48 
  49     def _copy_ctx(self):
  50         return self._api.copy_hash_context(self._ctx)
  51 
  52 
  53 class SHA1(BaseHash):
  54     name = "sha1"
  55     digest_size = 20
  56     block_size = 64
  57 
  58 
  59 class SHA224(BaseHash):
  60     name = "sha224"
  61     digest_size = 28
  62     block_size = 64
  63 
  64 
  65 class SHA256(BaseHash):
  66     name = "sha256"
  67     digest_size = 32
  68     block_size = 64
  69 
  70 
  71 class SHA384(BaseHash):
  72     name = "sha384"
  73     digest_size = 48
  74     block_size = 128
  75 
  76 
  77 class SHA512(BaseHash):
  78     name = "sha512"
  79     digest_size = 64
  80     block_size = 128
  81 
  82 
  83 class RIPEMD160(BaseHash):
  84     name = "ripemd160"
  85     digest_size = 20
  86     block_size = 64
  87 
  88 
  89 class Whirlpool(BaseHash):
  90     name = "whirlpool"
  91     digest_size = 64
  92     block_size = 64
  93 
  94 
  95 class MD5(BaseHash):
  96     name = "md5"
  97     digest_size = 16
  98     block_size = 64
  99
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/cryptography/primitives/hashes.py b/cryptography/primitives/hashes.py
  --- a/cryptography/primitives/hashes.py
  +++ b/cryptography/primitives/hashes.py
  @@ -44,7 +44,7 @@
                                                  self.digest_size)
   
       def hexdigest(self):
  -        return binascii.hexlify(self.digest()).decode("ascii")
  +        return str(binascii.hexlify(self.digest()).decode("ascii"))
   
       def _copy_ctx(self):
           return self._api.copy_hash_context(self._ctx)
  
verification_info: {"golden_diff": "diff --git a/cryptography/primitives/hashes.py b/cryptography/primitives/hashes.py\n--- a/cryptography/primitives/hashes.py\n+++ b/cryptography/primitives/hashes.py\n@@ -44,7 +44,7 @@\n                                                self.digest_size)\n \n     def hexdigest(self):\n-        return binascii.hexlify(self.digest()).decode(\"ascii\")\n+        return str(binascii.hexlify(self.digest()).decode(\"ascii\"))\n \n     def _copy_ctx(self):\n         return self._api.copy_hash_context(self._ctx)\n", "issue": "Hasher.hexdigest() is documented as returning a str, but returns unicode under python2\nIt should return a native string under boht py2 and py3\n\n", "before_files": [{"content": "# Licensed under the Apache License, Version 2.0 (the \"License\");\n# you may not use this file except in compliance with the License.\n# You may obtain a copy of the License at\n#\n#    http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS,\n# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or\n# implied.\n# See the License for the specific language governing permissions and\n# limitations under the License.\n\nfrom __future__ import absolute_import, division, print_function\n\nimport abc\n\nimport binascii\n\nimport six\n\nfrom cryptography.bindings import _default_api\n\n\nclass BaseHash(six.with_metaclass(abc.ABCMeta)):\n    def __init__(self, data=None, api=None, ctx=None):\n        if api is None:\n            api = _default_api\n        self._api = api\n        self._ctx = self._api.create_hash_context(self) if ctx is None else ctx\n        if data is not None:\n            self.update(data)\n\n    def update(self, data):\n        if isinstance(data, six.text_type):\n            raise TypeError(\"Unicode-objects must be encoded before hashing\")\n        self._api.update_hash_context(self._ctx, data)\n\n    def copy(self):\n        return self.__class__(ctx=self._copy_ctx())\n\n    def digest(self):\n        return self._api.finalize_hash_context(self._copy_ctx(),\n                                               self.digest_size)\n\n    def hexdigest(self):\n        return binascii.hexlify(self.digest()).decode(\"ascii\")\n\n    def _copy_ctx(self):\n        return self._api.copy_hash_context(self._ctx)\n\n\nclass SHA1(BaseHash):\n    name = \"sha1\"\n    digest_size = 20\n    block_size = 64\n\n\nclass SHA224(BaseHash):\n    name = \"sha224\"\n    digest_size = 28\n    block_size = 64\n\n\nclass SHA256(BaseHash):\n    name = \"sha256\"\n    digest_size = 32\n    block_size = 64\n\n\nclass SHA384(BaseHash):\n    name = \"sha384\"\n    digest_size = 48\n    block_size = 128\n\n\nclass SHA512(BaseHash):\n    name = \"sha512\"\n    digest_size = 64\n    block_size = 128\n\n\nclass RIPEMD160(BaseHash):\n    name = \"ripemd160\"\n    digest_size = 20\n    block_size = 64\n\n\nclass Whirlpool(BaseHash):\n    name = \"whirlpool\"\n    digest_size = 64\n    block_size = 64\n\n\nclass MD5(BaseHash):\n    name = \"md5\"\n    digest_size = 16\n    block_size = 64\n", "path": "cryptography/primitives/hashes.py"}], "after_files": [{"content": "# Licensed under the Apache License, Version 2.0 (the \"License\");\n# you may not use this file except in compliance with the License.\n# You may obtain a copy of the License at\n#\n#    http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS,\n# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or\n# implied.\n# See the License for the specific language governing permissions and\n# limitations under the License.\n\nfrom __future__ import absolute_import, division, print_function\n\nimport abc\n\nimport binascii\n\nimport six\n\nfrom cryptography.bindings import _default_api\n\n\nclass BaseHash(six.with_metaclass(abc.ABCMeta)):\n    def __init__(self, data=None, api=None, ctx=None):\n        if api is None:\n            api = _default_api\n        self._api = api\n        self._ctx = self._api.create_hash_context(self) if ctx is None else ctx\n        if data is not None:\n            self.update(data)\n\n    def update(self, data):\n        if isinstance(data, six.text_type):\n            raise TypeError(\"Unicode-objects must be encoded before hashing\")\n        self._api.update_hash_context(self._ctx, data)\n\n    def copy(self):\n        return self.__class__(ctx=self._copy_ctx())\n\n    def digest(self):\n        return self._api.finalize_hash_context(self._copy_ctx(),\n                                               self.digest_size)\n\n    def hexdigest(self):\n        return str(binascii.hexlify(self.digest()).decode(\"ascii\"))\n\n    def _copy_ctx(self):\n        return self._api.copy_hash_context(self._ctx)\n\n\nclass SHA1(BaseHash):\n    name = \"sha1\"\n    digest_size = 20\n    block_size = 64\n\n\nclass SHA224(BaseHash):\n    name = \"sha224\"\n    digest_size = 28\n    block_size = 64\n\n\nclass SHA256(BaseHash):\n    name = \"sha256\"\n    digest_size = 32\n    block_size = 64\n\n\nclass SHA384(BaseHash):\n    name = \"sha384\"\n    digest_size = 48\n    block_size = 128\n\n\nclass SHA512(BaseHash):\n    name = \"sha512\"\n    digest_size = 64\n    block_size = 128\n\n\nclass RIPEMD160(BaseHash):\n    name = \"ripemd160\"\n    digest_size = 20\n    block_size = 64\n\n\nclass Whirlpool(BaseHash):\n    name = \"whirlpool\"\n    digest_size = 64\n    block_size = 64\n\n\nclass MD5(BaseHash):\n    name = \"md5\"\n    digest_size = 16\n    block_size = 64\n", "path": "cryptography/primitives/hashes.py"}]}