Don't compare cffi version using strings (#3524)

2 files changed, 2 insertions, 9 deletions

diff --git a/src/cryptography/hazmat/primitives/ciphers/base.py b/src/cryptography/hazmat/primitives/ciphers/base.py
index 502d9804..e9d55a10 100644
--- a/src/cryptography/hazmat/primitives/ciphers/base.py
+++ b/src/cryptography/hazmat/primitives/ciphers/base.py
@@ -147,7 +147,7 @@ class _CipherContext(object):
 
     # cffi 1.7 supports from_buffer on bytearray, which is required. We can
     # remove this check in the future when we raise our minimum PyPy version.
-    if utils._version_check(cffi.__version__, "1.7"):
+    if cffi.__version_info__ >= (1, 7):
         def update_into(self, data, buf):
             if self._ctx is None:
                 raise AlreadyFinalized("Context was already finalized.")
@@ -195,7 +195,7 @@ class _AEADCipherContext(object):
 
     # cffi 1.7 supports from_buffer on bytearray, which is required. We can
     # remove this check in the future when we raise our minimum PyPy version.
-    if utils._version_check(cffi.__version__, "1.7"):
+    if cffi.__version_info__ >= (1, 7):
         def update_into(self, data, buf):
             self._check_limit(len(data))
             return self._ctx.update_into(data, buf)
diff --git a/src/cryptography/utils.py b/src/cryptography/utils.py
index 40359c62..bec56d5b 100644
--- a/src/cryptography/utils.py
+++ b/src/cryptography/utils.py
@@ -10,8 +10,6 @@ import inspect
 import sys
 import warnings
 
-from packaging.version import parse
-
 
 # Several APIs were deprecated with no specific end-of-life date because of the
 # ubiquity of their use. They should not be removed until we agree on when that
@@ -104,11 +102,6 @@ else:
         return len(bin(x)) - (2 + (x <= 0))
 
 
-def _version_check(version, required_version):
-    # This is used to check if we support update_into on CipherContext.
-    return parse(version) >= parse(required_version)
-
-
 class _DeprecatedValue(object):
     def __init__(self, value, message, warning_class):
         self.value = value