From ba01ba773731cb2c906beb6855dfea588dc8cf09 Mon Sep 17 00:00:00 2001
From: Kévin Le Gouguec <kevin.legouguec@airbus.com>
Date: Fri, 22 Mar 2019 14:48:47 +0100
Subject: [implem-python] Création de la surcouche "crypto_aead"
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Il ne reste  plus qu'à générer les  dossiers lilliputae*/add_python et
les fichiers parameters.py correspondants, et  on peut ajouter le tout
à l'archive à soumettre au NIST.
---
 python/crypto_aead.py | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 python/crypto_aead.py

(limited to 'python/crypto_aead.py')

diff --git a/python/crypto_aead.py b/python/crypto_aead.py
new file mode 100644
index 0000000..792369c
--- /dev/null
+++ b/python/crypto_aead.py
@@ -0,0 +1,18 @@
+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
+
+
+def encrypt(m, ad, npub, k):
+    c, tag = lilliput.encrypt(m, ad, k, npub, MODE)
+    return c+tag
+
+
+def decrypt(c, ad, npub, k):
+    clen = len(c)-TAG_BYTES
+    ctext = c[:clen]
+    tag = c[clen:]
+    return lilliput.decrypt(ctext, tag, ad, k, npub, MODE)
-- 
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