mirror of https://git.matrix.org/git/olm.git
100 lines
3.4 KiB
Python
100 lines
3.4 KiB
Python
import json
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from ._base import *
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lib.olm_inbound_group_session_size.argtypes = []
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lib.olm_inbound_group_session_size.restype = c_size_t
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lib.olm_inbound_group_session.argtypes = [c_void_p]
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lib.olm_inbound_group_session.restype = c_void_p
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lib.olm_inbound_group_session_last_error.argtypes = [c_void_p]
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lib.olm_inbound_group_session_last_error.restype = c_char_p
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def inbound_group_session_errcheck(res, func, args):
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if res == ERR:
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raise OlmError("%s: %s" % (
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func.__name__, lib.olm_inbound_group_session_last_error(args[0])
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))
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return res
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def inbound_group_session_function(func, *types):
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func.argtypes = (c_void_p,) + types
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func.restypes = c_size_t
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func.errcheck = inbound_group_session_errcheck
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inbound_group_session_function(
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lib.olm_pickle_inbound_group_session, c_void_p, c_size_t, c_void_p, c_size_t
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)
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inbound_group_session_function(
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lib.olm_unpickle_inbound_group_session, c_void_p, c_size_t, c_void_p, c_size_t
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)
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inbound_group_session_function(
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lib.olm_init_inbound_group_session, c_void_p, c_size_t
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)
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inbound_group_session_function(
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lib.olm_group_decrypt_max_plaintext_length, c_void_p, c_size_t
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)
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inbound_group_session_function(
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lib.olm_group_decrypt,
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c_void_p, c_size_t, # message
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c_void_p, c_size_t, # plaintext
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POINTER(c_uint32), # message_index
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)
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inbound_group_session_function(lib.olm_inbound_group_session_id_length)
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inbound_group_session_function(lib.olm_inbound_group_session_id, c_void_p, c_size_t)
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class InboundGroupSession(object):
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def __init__(self):
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self.buf = create_string_buffer(lib.olm_inbound_group_session_size())
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self.ptr = lib.olm_inbound_group_session(self.buf)
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def pickle(self, key):
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key_buffer = create_string_buffer(key)
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pickle_length = lib.olm_pickle_inbound_group_session_length(self.ptr)
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pickle_buffer = create_string_buffer(pickle_length)
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lib.olm_pickle_inbound_group_session(
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self.ptr, key_buffer, len(key), pickle_buffer, pickle_length
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)
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return pickle_buffer.raw
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def unpickle(self, key, pickle):
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key_buffer = create_string_buffer(key)
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pickle_buffer = create_string_buffer(pickle)
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lib.olm_unpickle_inbound_group_session(
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self.ptr, key_buffer, len(key), pickle_buffer, len(pickle)
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)
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def init(self, session_key):
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key_buffer = create_string_buffer(session_key)
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lib.olm_init_inbound_group_session(
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self.ptr, key_buffer, len(session_key)
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)
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def decrypt(self, message):
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message_buffer = create_string_buffer(message)
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max_plaintext_length = lib.olm_group_decrypt_max_plaintext_length(
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self.ptr, message_buffer, len(message)
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)
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plaintext_buffer = create_string_buffer(max_plaintext_length)
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message_buffer = create_string_buffer(message)
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message_index = c_uint32()
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plaintext_length = lib.olm_group_decrypt(
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self.ptr, message_buffer, len(message),
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plaintext_buffer, max_plaintext_length,
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byref(message_index)
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)
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return plaintext_buffer.raw[:plaintext_length], message_index
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def session_id(self):
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id_length = lib.olm_inbound_group_session_id_length(self.ptr)
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id_buffer = create_string_buffer(id_length)
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lib.olm_inbound_group_session_id(self.ptr, id_buffer, id_length);
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return id_buffer.raw
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