diff options
Diffstat (limited to 'python/olm')
| -rw-r--r-- | python/olm/sas.py | 35 |
1 files changed, 35 insertions, 0 deletions
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)) |