From 12585a5a0f2faca9c6ab2490bb50b34450876538 Mon Sep 17 00:00:00 2001
From: Kévin Le Gouguec <kevin.legouguec@airbus.com>
Date: Thu, 14 Mar 2019 16:45:35 +0100
Subject: [implem-python] Retrait des constantes globales
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Et des fonctions d'initialisation. Et d'une fonction non-utilisée dans
le mode SCT-2.
---
 python/lilliput_ae_1.py | 35 +-------------------------------
 python/lilliput_ae_2.py | 53 +------------------------------------------------
 2 files changed, 2 insertions(+), 86 deletions(-)

diff --git a/python/lilliput_ae_1.py b/python/lilliput_ae_1.py
index 8cf55bb..9de753c 100644
--- a/python/lilliput_ae_1.py
+++ b/python/lilliput_ae_1.py
@@ -15,32 +15,9 @@ from helpers import (
 )
 
 
-KEY_BITS = 128
 TWEAK_BITS = 192
-TWEAKEY_BITS = KEY_BITS + TWEAK_BITS
-LANE_BITS = 64
-LANES = int((TWEAKEY_BITS) / LANE_BITS)
+TWEAK_BYTES = TWEAK_BITS//8
 
-KEY_BYTES = int(KEY_BITS / 8)
-TWEAK_BYTES = int(TWEAK_BITS / 8)
-TWEAKEY_BYTES = int(TWEAKEY_BITS / 8)
-
-
-def InitParameters(key_bits) :
-    global KEY_BITS
-    global KEY_BYTES
-    global TWEAKEY_BITS
-    global TWEAKEY_BYTES
-    global LANES
-
-    KEY_BITS = key_bits
-    TWEAKEY_BITS = KEY_BITS + TWEAK_BITS
-    LANES = int((TWEAKEY_BITS) / LANE_BITS)
-    KEY_BYTES = int(KEY_BITS / 8)
-    TWEAKEY_BYTES = int(TWEAKEY_BITS / 8)
-
-
-###############################################################################
 
 def LowPart(array, number_bits) :
     shifted = 0
@@ -64,11 +41,6 @@ def LowPart(array, number_bits) :
 
     return lower_part_byte
 
-###############################################################################
-
-
-
-################################################################################
 
 class _MessageTweak(Enum):
     BLOCK = 0b000
@@ -156,11 +128,8 @@ def TreatMessageDec(C, N, key) :
     return (Final, M)
 
 
-
 ################################################################################
 def OCB3Enc(A, M, N, key) :
-    InitParameters(len(key)*8)
-
     K = list(key)
 
     Auth = BuildAuth(TWEAK_BITS, A, K)
@@ -171,8 +140,6 @@ def OCB3Enc(A, M, N, key) :
 
 
 def OCB3Dec(A, C, N, tag, key) :
-    InitParameters(len(key)*8)
-
     K = list(key)
 
     Auth = BuildAuth(TWEAK_BITS, A, K)
diff --git a/python/lilliput_ae_2.py b/python/lilliput_ae_2.py
index 720e1aa..cb1d1c4 100644
--- a/python/lilliput_ae_2.py
+++ b/python/lilliput_ae_2.py
@@ -13,56 +13,9 @@ from helpers import (
 )
 
 
-KEY_BITS = 128
 TWEAK_BITS = 128
-TWEAKEY_BITS = KEY_BITS + TWEAK_BITS
-LANE_BITS = 64
-LANES = int((TWEAKEY_BITS) / LANE_BITS)
+TWEAK_BYTES = TWEAK_BITS//8
 
-KEY_BYTES = int(KEY_BITS / 8)
-TWEAK_BYTES = int(TWEAK_BITS / 8)
-TWEAKEY_BYTES = int(TWEAKEY_BITS / 8)
-
-
-def InitParameters(key_bits) :
-    global KEY_BITS
-    global KEY_BYTES
-    global TWEAKEY_BITS
-    global TWEAKEY_BYTES
-    global LANES
-
-    KEY_BITS = key_bits
-    TWEAKEY_BITS = KEY_BITS + TWEAK_BITS
-    LANES = int((TWEAKEY_BITS) / LANE_BITS)
-    KEY_BYTES = int(KEY_BITS / 8)
-    TWEAKEY_BYTES = int(TWEAKEY_BITS / 8)
-
-
-###############################################################################
-
-def LowPart(array, number_bits) :
-    shifted = 0
-    for byte in range(0, len(array)) :
-        shifted |= (array[byte] << (8 * byte))
-
-    mask = 0
-    for bit in range(0, number_bits) :
-        mask |= (0x1 << bit)
-
-    lower_part = shifted & mask
-
-    will_padd = 0
-    if (number_bits % 8) != 0 :
-        will_padd = 1
-
-    lower_part_byte = [0 for byte in range(0, int(number_bits / 8)  + will_padd)]
-    for byte in range(0, int(number_bits / 8)  + will_padd) :
-        lower_part_byte[byte] = lower_part & 0xff
-        lower_part = lower_part >> 8
-
-    return lower_part_byte
-
-################################################################################
 
 def TweakTag(j, padded):
         tweak = [0 for byte in range(0,  TWEAK_BYTES)]
@@ -146,8 +99,6 @@ def MessageEncryption(M, N, tag, key) :
 
 ################################################################################
 def SCT2Enc(A, M, N, key) :
-    InitParameters(len(key)*8)
-
     K = list(key)
 
     Auth = BuildAuth(TWEAK_BITS, A, K)
@@ -158,8 +109,6 @@ def SCT2Enc(A, M, N, key) :
 
 
 def SCT2Dec(A, C, N, tag, key) :
-    InitParameters(len(key)*8)
-
     K = list(key)
 
     M = BlockbytesMatrixToBytes(
-- 
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