revert asn1 time parsing to avoid locale problems

1 files changed, 14 insertions, 5 deletions

diff --git a/src/cryptography/hazmat/backends/openssl/x509.py b/src/cryptography/hazmat/backends/openssl/x509.py
index 26c5edc20..01055c5f4 100644
--- a/src/cryptography/hazmat/backends/openssl/x509.py
+++ b/src/cryptography/hazmat/backends/openssl/x509.py
@@ -96,8 +96,17 @@ class _Certificate(object):
         return self._parse_asn1_time(asn1_time)
 
     def _parse_asn1_time(self, asn1_time):
-        bio = self._backend._create_mem_bio()
-        res = self._backend._lib.ASN1_TIME_print(bio, asn1_time)
-        assert res == 1
-        time = self._backend._read_mem_bio(bio).decode("ascii")
-        return datetime.datetime.strptime(time, "%b %d %H:%M:%S %Y GMT")
+        assert asn1_time != self._backend._ffi.NULL
+        generalized_time = self._backend._lib.ASN1_TIME_to_generalizedtime(
+            asn1_time, self._backend._ffi.NULL
+        )
+        assert generalized_time != self._backend._ffi.NULL
+        generalized_time = self._backend._ffi.gc(
+            generalized_time, self._backend._lib.ASN1_GENERALIZEDTIME_free
+        )
+        time = self._backend._ffi.string(
+            self._backend._lib.ASN1_STRING_data(
+                self._backend._ffi.cast("ASN1_STRING *", generalized_time)
+            )
+        ).decode("ascii")
+        return datetime.datetime.strptime(time, "%Y%m%d%H%M%SZ")