lilliput-ae-reference-implementation

commit d6164fddbb09f0dc5248b341e97610957f80f8f8
parent b6186739572125788c9ae0c528458eaaa7361ce9
Author: Kévin Le Gouguec <kevin.legouguec@airbus.com>
Date:   Mon, 25 Mar 2019 09:45:24 +0100

[implem-python] Suppression de variables intermédiaires

Le  code  résultant ressemble  plus  à  ce  qui  est décrit  dans  les
algorithmes 3 et 4.

Diffstat:
M
src/add_python/lilliput/ae_mode_2.py
 | 
9
+++------

1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/src/add_python/lilliput/ae_mode_2.py b/src/add_python/lilliput/ae_mode_2.py
@@ -69,8 +69,7 @@ def _message_auth_tag(M, N, Auth, key):
 
     if need_padding:
         tweak = _tweak_tag(l, True)
-        m_padded = pad10(M[l])
-        encryption = tbc.encrypt(tweak, key, m_padded)
+        encryption = tbc.encrypt(tweak, key, pad10(M[l]))
         tag = xor(tag, encryption)
 
     tweak = N + [0b00010000]
@@ -89,14 +88,12 @@ def _message_encryption(M, N, tag, key):
 
     for j in range(0, l):
         tweak = _add_tag_j(tag, j)
-        padded_nonce = N + [0b00000000]
-        encryption = tbc.encrypt(tweak, key, padded_nonce)
+        encryption = tbc.encrypt(tweak, key, N+[0b00000000])
         C.append(xor(M[j], encryption))
 
     if need_padding:
         tweak = _add_tag_j(tag, l)
-        padded_nonce = N + [0b00000000]
-        encryption = tbc.encrypt(tweak, key, padded_nonce)
+        encryption = tbc.encrypt(tweak, key, N+[0b00000000])
         C.append(xor(M[l], encryption))
 
     return C