From 32b99b793572c109fe0f3507705a10aefe2d8cf7 Mon Sep 17 00:00:00 2001
From: Damir Jelić <poljar@termina.org.uk>
Date: Tue, 9 Apr 2019 10:57:36 +0200
Subject: python: Add support for the long KDF MAC calculation.
---
python/olm/sas.py | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
(limited to 'python/olm')
diff --git a/python/olm/sas.py b/python/olm/sas.py
index 8574cfd..c12b7bc 100644
--- a/python/olm/sas.py
+++ b/python/olm/sas.py
@@ -220,3 +220,38 @@ class Sas(object):
)
)
return bytes_to_native_str(ffi.unpack(mac_buffer, mac_length))
+
+ @other_pubkey_set
+ def calculate_mac_long_kdf(self, message, extra_info):
+ # type: (str, str) -> str
+ """Generate a message authentication code based on the shared secret.
+
+ This function should not be used unless compatibility with an older
+ non-tagged Olm version is required.
+
+ Args:
+ message (str): The message to produce the authentication code for.
+ extra_info (str): Extra information to mix in when generating the
+ MAC
+
+ Raises OlmSasError on failure.
+
+ """
+ byte_message = to_bytes(message)
+ byte_info = to_bytes(extra_info)
+
+ mac_length = lib.olm_sas_mac_length(self._sas)
+ mac_buffer = ffi.new("char[]", mac_length)
+
+ self._check_error(
+ lib.olm_sas_calculate_mac_long_kdf(
+ self._sas,
+ ffi.from_buffer(byte_message),
+ len(byte_message),
+ ffi.from_buffer(byte_info),
+ len(byte_info),
+ mac_buffer,
+ mac_length
+ )
+ )
+ return bytes_to_native_str(ffi.unpack(mac_buffer, mac_length))
--
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