[implem-python] Nettoyage PEP8

- espaces avant ':'
- espaces en trop après ','
- parenthèses dans les if
- levée d'exception plutôt que 'return None' implicite

Simplification  de genkat_aead.py  grâce  à l'exception  levée par  le
module.

1 files changed, 18 insertions, 5 deletions

diff --git a/python/helpers.py b/python/helpers.py
index 45c48c9..b02bea4 100644
--- a/python/helpers.py
+++ b/python/helpers.py
@@ -2,20 +2,20 @@ from constants import BLOCK_BITS, BLOCK_BYTES
 from lilliput_tbc import LilliputTBCEnc
 
 
-def ArrayToBlockbytesMatrix(array) :
+def ArrayToBlockbytesMatrix(array):
     length = len(array)
     pad = 0
-    if(length % BLOCK_BYTES == 0) :
+    if length % BLOCK_BYTES == 0:
         number_blocks = int(length / BLOCK_BYTES)
-    else :
+    else:
         number_blocks = int((length + (BLOCK_BYTES - (length % BLOCK_BYTES))) / BLOCK_BYTES)
         pad = 1
 
     matrix = [[0] * BLOCK_BYTES for block in range(0, number_blocks - pad)]
-    if(pad == 1) :
+    if pad == 1:
         matrix.append([0] * (length % BLOCK_BYTES))
 
-    for byte in range(0, length) :
+    for byte in range(0, length):
         matrix[int(byte / BLOCK_BYTES)][byte % BLOCK_BYTES] = array[byte]
 
     return matrix
@@ -85,3 +85,16 @@ def BuildAuth(t, A, key):
     Auth = XorState(Auth, enc)
 
     return Auth
+
+
+class TagValidationError(Exception):
+    def __init__(self, announced, computed):
+        msg = '\n'.join((
+            'Invalid tag:',
+            announced.hex().upper()+' (announced)',
+            computed.hex().upper()+' (computed)'
+        ))
+
+        super().__init__(msg)
+        self._announced = announced
+        self._computed = computed