[implem-python] Intégration à la soumission (suite et fin)

En plus du paquet Python "lilliput", chaque dossier embarque

- un script "genkat_aead.py" qui génère les vecteurs de test via l'API
  du module "crypto_aead",
- un module "crypto_aead" servant de point d'entrée générique,
- un  module  "parameters",  qui  permet  à  crypto_aead  d'instancier
  Lilliput-AE avec le bon mode et la bonne taille de clé.

Livraison  dans ./crypto_aead  sans  se soucier  de l'arborescence  du
dépôt, par homogénéité avec make-package.sh.

Quelques  ajustement  dans  genkat_aead.py   pour  que  le  lien  avec
genkat_aead.c soit plus évident.

2 files changed, 21 insertions, 10 deletions

diff --git a/nist/package-python.sh b/nist/package-python.sh
index 4813dc7..88c4ef1 100755
--- a/nist/package-python.sh
+++ b/nist/package-python.sh
@@ -5,7 +5,7 @@ set -eu
 NIST_DIR=$(dirname $0)
 ROOT=${NIST_DIR}/..
 ADD_PYTHON=${ROOT}/src/add_python
-CRYPTO_AEAD=${ROOT}/crypto_aead
+PYTHON_RESOURCES=${ROOT}/test/python/
 
 
 add-variant ()
@@ -15,7 +15,7 @@ add-variant ()
 
     local -A names=([1]=lilliputaei [2]=lilliputaeii)
 
-    variant_dir=${CRYPTO_AEAD}/${names[${mode}]}${keylen}v1
+    variant_dir=crypto_aead/${names[${mode}]}${keylen}v1
 
     cp -r ${ADD_PYTHON} ${variant_dir}
 
@@ -23,6 +23,9 @@ add-variant ()
 MODE = ${mode}
 KEYBYTES = $((keylen/8))
 EOF
+
+    cp ${PYTHON_RESOURCES}/{crypto_aead.py,genkat_aead.py} \
+       ${variant_dir}/add_python
 }
 
 
diff --git a/test/python/genkat_aead.py b/test/python/genkat_aead.py
index 01bed6f..5e953c4 100755
--- a/test/python/genkat_aead.py
+++ b/test/python/genkat_aead.py
@@ -3,8 +3,13 @@
 import crypto_aead
 
 
+class DecryptionError(Exception):
+    def __init__(self):
+        super().__init__('crypto_aead_decrypt did not recover the plaintext')
+
+
 MAX_MESSAGE_LENGTH = 32
-MAX_ADATA_LENGTH = 32
+MAX_ASSOCIATED_DATA_LENGTH = 32
 
 
 def print_bstr(output, label, buf):
@@ -12,23 +17,25 @@ def print_bstr(output, label, buf):
 
 
 def generate_test_vectors():
-    output_path = 'LWC_AEAD_KAT_{key}_{npub}.txt'.format(
+    count = 1
+    filename = 'LWC_AEAD_KAT_{key}_{npub}.txt'.format(
         key=crypto_aead.KEYBYTES*8, npub=crypto_aead.NPUBBYTES*8
     )
 
     npub = bytes(range(crypto_aead.NPUBBYTES))
     key = bytes(range(crypto_aead.KEYBYTES))
 
-    with open(output_path, 'w') as output:
+    with open(filename, 'w') as output:
 
-        count = 1
         for mlen in range(MAX_MESSAGE_LENGTH+1):
-            for adlen in range(MAX_ADATA_LENGTH+1):
-                print('Count = {c}'.format(c=count), file=output)
+            for adlen in range(MAX_ASSOCIATED_DATA_LENGTH+1):
 
                 msg = bytes(range(mlen))
                 ad = bytes(range(adlen))
 
+                print('Count = {c}'.format(c=count), file=output)
+                count += 1
+
                 print_bstr(output, 'Key', key)
                 print_bstr(output, 'Nonce', npub)
                 print_bstr(output, 'PT', msg)
@@ -38,9 +45,10 @@ def generate_test_vectors():
 
                 print_bstr(output, 'CT', ct)
 
-                crypto_aead.decrypt(ct, ad, npub, key)
+                msg2 = crypto_aead.decrypt(ct, ad, npub, key)
 
-                count += 1
+                if msg != msg2:
+                    raise DecryptionError()
 
                 print(file=output)