1 files changed, 0 insertions, 35 deletions
diff --git a/src/cryptography/hazmat/backends/openssl/ciphers.py b/src/cryptography/hazmat/backends/openssl/ciphers.py
index bd5dfb31..898b3497 100644
--- a/src/cryptography/hazmat/backends/openssl/ciphers.py
+++ b/src/cryptography/hazmat/backends/openssl/ciphers.py
@@ -167,38 +167,3 @@ class _CipherContext(object):
         self._backend.openssl_assert(res != 0)
 
     tag = utils.read_only_property("_tag")
-
-
-@utils.register_interface(ciphers.CipherContext)
-class _AESCTRCipherContext(object):
-    """
-    This is needed to provide support for AES CTR mode in OpenSSL 1.0.0. It can
-    be removed when we drop 1.0.0 support (RHEL 6.4 is the only thing that
-    ships it).
-    """
-    def __init__(self, backend, cipher, mode):
-        self._backend = backend
-
-        self._key = self._backend._ffi.new("AES_KEY *")
-        res = self._backend._lib.AES_set_encrypt_key(
-            cipher.key, len(cipher.key) * 8, self._key
-        )
-        self._backend.openssl_assert(res == 0)
-        self._ecount = self._backend._ffi.new("unsigned char[]", 16)
-        self._nonce = self._backend._ffi.new("unsigned char[16]", mode.nonce)
-        self._num = self._backend._ffi.new("unsigned int *", 0)
-
-    def update(self, data):
-        buf = self._backend._ffi.new("unsigned char[]", len(data))
-        self._backend._lib.AES_ctr128_encrypt(
-            data, buf, len(data), self._key, self._nonce,
-            self._ecount, self._num
-        )
-        return self._backend._ffi.buffer(buf)[:]
-
-    def finalize(self):
-        self._key = None
-        self._ecount = None
-        self._nonce = None
-        self._num = None
-        return b""