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from ._base import *
lib.olm_session_size.argtypes = []
lib.olm_session_size.restype = c_size_t
lib.olm_session.argtypes = [c_void_p]
lib.olm_session.restype = c_void_p
lib.olm_session_last_error.argtypes = [c_void_p]
lib.olm_session_last_error.restype = c_char_p
def session_errcheck(res, func, args):
if res == ERR:
raise OlmError("%s: %s" % (
func.__name__, lib.olm_session_last_error(args[0])
))
return res
def session_function(func, *types):
func.argtypes = (c_void_p,) + types
func.restypes = c_size_t
func.errcheck = session_errcheck
session_function(lib.olm_session_last_error)
session_function(
lib.olm_pickle_session, c_void_p, c_size_t, c_void_p, c_size_t
)
session_function(
lib.olm_unpickle_session, c_void_p, c_size_t, c_void_p, c_size_t
)
session_function(lib.olm_create_outbound_session_random_length)
session_function(
lib.olm_create_outbound_session,
c_void_p, # Account
c_void_p, c_size_t, # Identity Key
c_void_p, c_size_t, # One Time Key
c_void_p, c_size_t, # Random
)
session_function(
lib.olm_create_inbound_session,
c_void_p, # Account
c_void_p, c_size_t, # Pre Key Message
)
session_function(
lib.olm_create_inbound_session_from,
c_void_p, # Account
c_void_p, c_size_t, # Identity Key
c_void_p, c_size_t, # Pre Key Message
)
session_function(lib.olm_session_id_length)
session_function(lib.olm_session_id, c_void_p, c_size_t)
session_function(lib.olm_matches_inbound_session, c_void_p, c_size_t)
session_function(
lib.olm_matches_inbound_session_from,
c_void_p, c_size_t, # Identity Key
c_void_p, c_size_t, # Pre Key Message
)
session_function(lib.olm_pickle_session_length)
session_function(lib.olm_encrypt_message_type)
session_function(lib.olm_encrypt_random_length)
session_function(lib.olm_encrypt_message_length, c_size_t)
session_function(
lib.olm_encrypt,
c_void_p, c_size_t, # Plaintext
c_void_p, c_size_t, # Random
c_void_p, c_size_t, # Message
);
session_function(
lib.olm_decrypt_max_plaintext_length,
c_size_t, # Message Type
c_void_p, c_size_t, # Message
)
session_function(
lib.olm_decrypt,
c_size_t, # Message Type
c_void_p, c_size_t, # Message
c_void_p, c_size_t, # Plaintext
)
class Session(object):
def __init__(self):
self.buf = create_string_buffer(lib.olm_session_size())
self.ptr = lib.olm_session(self.buf)
def pickle(self, key):
key_buffer = create_string_buffer(key)
pickle_length = lib.olm_pickle_session_length(self.ptr)
pickle_buffer = create_string_buffer(pickle_length)
lib.olm_pickle_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_session(
self.ptr, key_buffer, len(key), pickle_buffer, len(pickle)
)
def create_outbound(self, account, identity_key, one_time_key):
r_length = lib.olm_create_outbound_session_random_length(self.ptr)
random = read_random(r_length)
random_buffer = create_string_buffer(random)
identity_key_buffer = create_string_buffer(identity_key)
one_time_key_buffer = create_string_buffer(one_time_key)
lib.olm_create_outbound_session(
self.ptr,
account.ptr,
identity_key_buffer, len(identity_key),
one_time_key_buffer, len(one_time_key),
random_buffer, r_length
)
def create_inbound(self, account, one_time_key_message):
one_time_key_message_buffer = create_string_buffer(one_time_key_message)
lib.olm_create_inbound_session(
self.ptr,
account.ptr,
one_time_key_message_buffer, len(one_time_key_message)
)
def create_inbound_from(self, account, identity_key, one_time_key_message):
identity_key_buffer = create_string_buffer(identity_key)
one_time_key_message_buffer = create_string_buffer(one_time_key_message)
lib.olm_create_inbound_session_from(
self.ptr,
account.ptr,
identity_key_buffer, len(identity_key),
one_time_key_message_buffer, len(one_time_key_message)
)
def session_id(self):
id_length = lib.olm_session_id_length(self.ptr)
id_buffer = create_string_buffer(id_length)
lib.olm_session_id(self.ptr, id_buffer, id_length);
return id_buffer.raw
def matches_inbound(self, one_time_key_message):
one_time_key_message_buffer = create_string_buffer(one_time_key_message)
return bool(lib.olm_matches_inbound_session(
self.ptr,
one_time_key_message_buffer, len(one_time_key_message)
))
def matches_inbound_from(self, identity_key, one_time_key_message):
identity_key_buffer = create_string_buffer(identity_key)
one_time_key_message_buffer = create_string_buffer(one_time_key_message)
return bool(lib.olm_matches_inbound_session(
self.ptr,
identity_key_buffer, len(identity_key),
one_time_key_message_buffer, len(one_time_key_message)
))
def encrypt(self, plaintext):
r_length = lib.olm_encrypt_random_length(self.ptr)
random = read_random(r_length)
random_buffer = create_string_buffer(random)
message_type = lib.olm_encrypt_message_type(self.ptr)
message_length = lib.olm_encrypt_message_length(
self.ptr, len(plaintext)
)
message_buffer = create_string_buffer(message_length)
plaintext_buffer = create_string_buffer(plaintext)
lib.olm_encrypt(
self.ptr,
plaintext_buffer, len(plaintext),
random_buffer, r_length,
message_buffer, message_length,
)
return message_type, message_buffer.raw
def decrypt(self, message_type, message):
message_buffer = create_string_buffer(message)
max_plaintext_length = lib.olm_decrypt_max_plaintext_length(
self.ptr, message_type, message_buffer, len(message)
)
plaintext_buffer = create_string_buffer(max_plaintext_length)
message_buffer = create_string_buffer(message)
plaintext_length = lib.olm_decrypt(
self.ptr, message_type, message_buffer, len(message),
plaintext_buffer, max_plaintext_length
)
return plaintext_buffer.raw[:plaintext_length]
def clear(self):
pass
|
