2 files changed, 42 insertions, 8 deletions
diff --git a/test/python/crypto_aead.py b/test/python/crypto_aead.py
index 792369c..6a9b328 100644
--- a/test/python/crypto_aead.py
+++ b/test/python/crypto_aead.py
@@ -1,9 +1,29 @@
+# Implementation of the Lilliput-AE tweakable block cipher.
+#
+# Authors, hereby denoted as "the implementer":
+#     Kévin Le Gouguec,
+#     2019.
+#
+# For more information, feedback or questions, refer to our website:
+# https://paclido.fr/lilliput-ae
+#
+# To the extent possible under law, the implementer has waived all copyright
+# and related or neighboring rights to the source code in this file.
+# http://creativecommons.org/publicdomain/zero/1.0/
+
+"""Python port of the crypto_aead API for Lilliput-AE."""
+
 import lilliput
-from lilliput.constants import NONCE_BYTES as NPUBBYTES, TAG_BYTES
 
-# Import KEYBYTES to expose it to genkat_aead.
-# Import MODE to provide it to lilliput.
-from parameters import KEYBYTES, MODE
+from lilliput.constants import (
+    NONCE_BYTES as NPUBBYTES,   # Expose to genkat_aead.
+    TAG_BYTES
+)
+
+from parameters import (
+    KEYBYTES,                   # Expose to genkat_aead.
+    MODE
+)
 
 
 def encrypt(m, ad, npub, k):
@@ -12,7 +32,6 @@ def encrypt(m, ad, npub, k):
 
 
 def decrypt(c, ad, npub, k):
-    clen = len(c)-TAG_BYTES
-    ctext = c[:clen]
-    tag = c[clen:]
+    ctext = c[:-TAG_BYTES]
+    tag = c[-TAG_BYTES:]
     return lilliput.decrypt(ctext, tag, ad, k, npub, MODE)
diff --git a/test/python/genkat_aead.py b/test/python/genkat_aead.py
index 5e953c4..db3a89c 100755
--- a/test/python/genkat_aead.py
+++ b/test/python/genkat_aead.py
@@ -1,11 +1,26 @@
 #!/usr/bin/env python3
 
+# Python port of genkat_aead.c.
+#
+# Authors, hereby denoted as "the implementer":
+#     Kévin Le Gouguec,
+#     2019.
+#
+# For more information, feedback or questions, refer to our website:
+# https://paclido.fr/lilliput-ae
+#
+# To the extent possible under law, the implementer has waived all copyright
+# and related or neighboring rights to the source code in this file.
+# http://creativecommons.org/publicdomain/zero/1.0/
+
+"""Python port of the genkat_aead.c program."""
+
 import crypto_aead
 
 
 class DecryptionError(Exception):
     def __init__(self):
-        super().__init__('crypto_aead_decrypt did not recover the plaintext')
+        super().__init__('crypto_aead.decrypt did not recover the plaintext')
 
 
 MAX_MESSAGE_LENGTH = 32