mirror of https://git.matrix.org/git/olm.git
135 lines
4.1 KiB
Python
135 lines
4.1 KiB
Python
import json
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from os import urandom
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from ._base import *
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lib.olm_outbound_group_session_size.argtypes = []
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lib.olm_outbound_group_session_size.restype = c_size_t
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lib.olm_outbound_group_session.argtypes = [c_void_p]
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lib.olm_outbound_group_session.restype = c_void_p
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lib.olm_outbound_group_session_last_error.argtypes = [c_void_p]
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lib.olm_outbound_group_session_last_error.restype = c_char_p
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def outbound_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_outbound_group_session_last_error(args[0])
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))
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return res
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def outbound_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 = outbound_group_session_errcheck
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outbound_group_session_function(
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lib.olm_pickle_outbound_group_session,
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c_void_p, c_size_t, c_void_p, c_size_t,
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)
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outbound_group_session_function(
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lib.olm_unpickle_outbound_group_session,
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c_void_p, c_size_t, c_void_p, c_size_t,
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)
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outbound_group_session_function(
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lib.olm_init_outbound_group_session_random_length,
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)
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outbound_group_session_function(
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lib.olm_init_outbound_group_session,
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c_void_p, c_size_t,
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)
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lib.olm_outbound_group_session_message_index.argtypes = [c_void_p]
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lib.olm_outbound_group_session_message_index.restype = c_uint32
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outbound_group_session_function(
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lib.olm_group_encrypt_message_length,
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c_size_t,
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)
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outbound_group_session_function(
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lib.olm_group_encrypt,
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c_void_p, c_size_t, # Plaintext
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c_void_p, c_size_t, # Message
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)
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outbound_group_session_function(
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lib.olm_outbound_group_session_id_length,
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)
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outbound_group_session_function(
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lib.olm_outbound_group_session_id,
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c_void_p, c_size_t,
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)
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outbound_group_session_function(
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lib.olm_outbound_group_session_key_length,
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)
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outbound_group_session_function(
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lib.olm_outbound_group_session_key,
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c_void_p, c_size_t,
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)
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class OutboundGroupSession(object):
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def __init__(self):
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self.buf = create_string_buffer(lib.olm_outbound_group_session_size())
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self.ptr = lib.olm_outbound_group_session(self.buf)
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random_length = lib.olm_init_outbound_group_session_random_length(
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self.ptr
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)
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random = urandom(random_length)
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random_buffer = create_string_buffer(random)
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lib.olm_init_outbound_group_session(
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self.ptr, random_buffer, random_length
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)
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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_outbound_group_session_length(self.ptr)
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pickle_buffer = create_string_buffer(pickle_length)
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lib.olm_pickle_outbound_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_outbound_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 encrypt(self, plaintext):
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message_length = lib.olm_group_encrypt_message_length(
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self.ptr, len(plaintext)
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)
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message_buffer = create_string_buffer(message_length)
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plaintext_buffer = create_string_buffer(plaintext)
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lib.olm_group_encrypt(
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self.ptr,
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plaintext_buffer, len(plaintext),
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message_buffer, message_length,
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)
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return message_buffer.raw
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def session_id(self):
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id_length = lib.olm_outbound_group_session_id_length(self.ptr)
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id_buffer = create_string_buffer(id_length)
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lib.olm_outbound_group_session_id(self.ptr, id_buffer, id_length)
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return id_buffer.raw
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def message_index(self):
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return lib.olm_outbound_group_session_message_index(self.ptr)
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def session_key(self):
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key_length = lib.olm_outbound_group_session_key_length(self.ptr)
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key_buffer = create_string_buffer(key_length)
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lib.olm_outbound_group_session_key(self.ptr, key_buffer, key_length)
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return key_buffer.raw
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