pygost/gost34112012.py | 17 +++++++----------

diff --git a/pygost/gost34112012.py b/pygost/gost34112012.py
index 928e104787a2f1598a9f6f6c51b7b9faee39ea1cb7aafdab6a455d4961b58263..ad23993726b941c648d807b5f5451a5d4552b92177901e647f5646e3908dd82e 100644
--- a/pygost/gost34112012.py
+++ b/pygost/gost34112012.py
@@ -162,14 +162,8 @@         "faf417d5d9b21b9948bc924af11bd720",
     ),
 )]
 
-# Trade memory for CPU for part of L() calculations
-_Cache = None
 
-
-def _cache_ensure():
-    global _Cache
-    if _Cache is not None:
-        return
+def _lcache():
     cache = []
     for byteN in xrange(8):
         cache.append([0 for _ in xrange(256)])
@@ -182,7 +176,11 @@                 if val & 0x80 > 0:
                     res64 ^= A[(7 - byteN) * 8 + bitN]
                 val <<= 1
             cache[byteN][byteVal] = res64
-    _Cache = cache
+    return cache
+
+
+# Trade memory for CPU for part of L() calculations
+LCache = _lcache()
 
 
 def add512bit(a, b):
@@ -222,12 +220,11 @@     return res
 
 
 def L(data):
-    _cache_ensure()
     res = []
     for i in range(8):
         res64 = 0
         for j in range(8):
-            res64 ^= _Cache[j][data[8 * i + j]]
+            res64 ^= LCache[j][data[8 * i + j]]
         res.append(pack("<Q", res64))
     return b"".join(res)