Merge branch 'refactor-python-implem'

1 files changed, 72 insertions, 0 deletions

diff --git a/test/python/genkat_aead.py b/test/python/genkat_aead.py
new file mode 100755
index 0000000..db3a89c
--- /dev/null
+++ b/test/python/genkat_aead.py
@@ -0,0 +1,72 @@
+#!/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')
+
+
+MAX_MESSAGE_LENGTH = 32
+MAX_ASSOCIATED_DATA_LENGTH = 32
+
+
+def print_bstr(output, label, buf):
+    print('{l} = {b}'.format(l=label, b=buf.hex().upper()), file=output)
+
+
+def generate_test_vectors():
+    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(filename, 'w') as output:
+
+        for mlen in range(MAX_MESSAGE_LENGTH+1):
+            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)
+                print_bstr(output, 'AD', ad)
+
+                ct = crypto_aead.encrypt(msg, ad, npub, key)
+
+                print_bstr(output, 'CT', ct)
+
+                msg2 = crypto_aead.decrypt(ct, ad, npub, key)
+
+                if msg != msg2:
+                    raise DecryptionError()
+
+                print(file=output)
+
+
+if __name__ == '__main__':
+    generate_test_vectors()