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import json
from ._base import *
lib.olm_outbound_group_session_size.argtypes = []
lib.olm_outbound_group_session_size.restype = c_size_t
lib.olm_outbound_group_session.argtypes = [c_void_p]
lib.olm_outbound_group_session.restype = c_void_p
lib.olm_outbound_group_session_last_error.argtypes = [c_void_p]
lib.olm_outbound_group_session_last_error.restype = c_char_p
def outbound_group_session_errcheck(res, func, args):
if res == ERR:
raise OlmError("%s: %s" % (
func.__name__, lib.olm_outbound_group_session_last_error(args[0])
))
return res
def outbound_group_session_function(func, *types):
func.argtypes = (c_void_p,) + types
func.restypes = c_size_t
func.errcheck = outbound_group_session_errcheck
outbound_group_session_function(
lib.olm_pickle_outbound_group_session, c_void_p, c_size_t, c_void_p, c_size_t
)
outbound_group_session_function(
lib.olm_unpickle_outbound_group_session, c_void_p, c_size_t, c_void_p, c_size_t
)
outbound_group_session_function(lib.olm_init_outbound_group_session_random_length)
outbound_group_session_function(lib.olm_init_outbound_group_session, c_void_p, c_size_t)
outbound_group_session_function(lib.olm_group_encrypt_message_length, c_size_t)
outbound_group_session_function(lib.olm_group_encrypt,
c_void_p, c_size_t, # Plaintext
c_void_p, c_size_t, # Message
)
class OutboundGroupSession(object):
def __init__(self):
self.buf = create_string_buffer(lib.olm_outbound_group_session_size())
self.ptr = lib.olm_outbound_group_session(self.buf)
random_length = lib.olm_init_outbound_group_session_random_length(self.ptr)
random = read_random(random_length)
random_buffer = create_string_buffer(random)
lib.olm_init_outbound_group_session(self.ptr, random_buffer, random_length)
def pickle(self, key):
key_buffer = create_string_buffer(key)
pickle_length = lib.olm_pickle_outbound_group_session_length(self.ptr)
pickle_buffer = create_string_buffer(pickle_length)
lib.olm_pickle_outbound_group_session(
self.ptr, key_buffer, len(key), pickle_buffer, pickle_length
)
return pickle_buffer.raw
def unpickle(self, key, pickle):
key_buffer = create_string_buffer(key)
pickle_buffer = create_string_buffer(pickle)
lib.olm_unpickle_outbound_group_session(
self.ptr, key_buffer, len(key), pickle_buffer, len(pickle)
)
def encrypt(self, plaintext):
message_length = lib.olm_group_encrypt_message_length(
self.ptr, len(plaintext)
)
message_buffer = create_string_buffer(message_length)
plaintext_buffer = create_string_buffer(plaintext)
lib.olm_group_encrypt(
self.ptr,
plaintext_buffer, len(plaintext),
message_buffer, message_length,
)
return message_buffer.raw
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