1 files changed, 31 insertions, 0 deletions
diff --git a/src/add_python/lilliput/__init__.py b/src/add_python/lilliput/__init__.py
new file mode 100644
index 0000000..5fbc0de
--- /dev/null
+++ b/src/add_python/lilliput/__init__.py
@@ -0,0 +1,31 @@
+from . import lilliput_ae_1
+from . import lilliput_ae_2
+from .constants import NONCE_BYTES
+
+
+_AE_MODES = {
+    1: lilliput_ae_1,
+    2: lilliput_ae_2
+}
+
+
+def _check_inputs(key, mode, nonce):
+    valid_key_lengths = (128, 192, 256)
+    if len(key)*8 not in valid_key_lengths:
+        raise ValueError('invalid key size: {} not in {}'.format(len(key)*8, valid_key_lengths))
+
+    if mode not in _AE_MODES:
+        raise ValueError('invalid mode: {} not in {}'.format(mode, tuple(_AE_MODES)))
+
+    if len(nonce) != NONCE_BYTES:
+        raise ValueError('invalid nonce size: expecting {}, have {}'.format(NONCE_BYTES, len(nonce)))
+
+
+def encrypt(plaintext, adata, key, nonce, mode):
+    _check_inputs(key, mode, nonce)
+    return _AE_MODES[mode].encrypt(adata, plaintext, nonce, key)
+
+
+def decrypt(ciphertext, tag, adata, key, nonce, mode):
+    _check_inputs(key, mode, nonce)
+    return _AE_MODES[mode].decrypt(adata, ciphertext, nonce, tag, key)