204 lines
6.6 KiB
Python
204 lines
6.6 KiB
Python
from os import urandom
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from ._base import *
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lib.olm_session_size.argtypes = []
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lib.olm_session_size.restype = c_size_t
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lib.olm_session.argtypes = [c_void_p]
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lib.olm_session.restype = c_void_p
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lib.olm_session_last_error.argtypes = [c_void_p]
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lib.olm_session_last_error.restype = c_char_p
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def 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_session_last_error(args[0])
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))
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return res
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def 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 = session_errcheck
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session_function(lib.olm_session_last_error)
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session_function(
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lib.olm_pickle_session, c_void_p, c_size_t, c_void_p, c_size_t
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)
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session_function(
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lib.olm_unpickle_session, c_void_p, c_size_t, c_void_p, c_size_t
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)
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session_function(lib.olm_create_outbound_session_random_length)
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session_function(
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lib.olm_create_outbound_session,
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c_void_p, # Account
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c_void_p, c_size_t, # Identity Key
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c_void_p, c_size_t, # One Time Key
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c_void_p, c_size_t, # Random
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)
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session_function(
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lib.olm_create_inbound_session,
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c_void_p, # Account
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c_void_p, c_size_t, # Pre Key Message
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)
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session_function(
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lib.olm_create_inbound_session_from,
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c_void_p, # Account
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c_void_p, c_size_t, # Identity Key
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c_void_p, c_size_t, # Pre Key Message
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)
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session_function(lib.olm_session_id_length)
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session_function(lib.olm_session_id, c_void_p, c_size_t)
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session_function(lib.olm_matches_inbound_session, c_void_p, c_size_t)
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session_function(
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lib.olm_matches_inbound_session_from,
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c_void_p, c_size_t, # Identity Key
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c_void_p, c_size_t, # Pre Key Message
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)
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session_function(lib.olm_pickle_session_length)
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session_function(lib.olm_encrypt_message_type)
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session_function(lib.olm_encrypt_random_length)
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session_function(lib.olm_encrypt_message_length, c_size_t)
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session_function(
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lib.olm_encrypt,
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c_void_p, c_size_t, # Plaintext
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c_void_p, c_size_t, # Random
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c_void_p, c_size_t, # Message
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)
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session_function(
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lib.olm_decrypt_max_plaintext_length,
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c_size_t, # Message Type
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c_void_p, c_size_t, # Message
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)
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session_function(
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lib.olm_decrypt,
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c_size_t, # Message Type
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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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)
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class Session(object):
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def __init__(self):
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self.buf = create_string_buffer(lib.olm_session_size())
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self.ptr = lib.olm_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_session_length(self.ptr)
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pickle_buffer = create_string_buffer(pickle_length)
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lib.olm_pickle_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_session(
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self.ptr, key_buffer, len(key), pickle_buffer, len(pickle)
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)
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def create_outbound(self, account, identity_key, one_time_key):
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r_length = lib.olm_create_outbound_session_random_length(self.ptr)
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random = urandom(r_length)
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random_buffer = create_string_buffer(random)
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identity_key_buffer = create_string_buffer(identity_key)
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one_time_key_buffer = create_string_buffer(one_time_key)
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lib.olm_create_outbound_session(
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self.ptr,
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account.ptr,
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identity_key_buffer, len(identity_key),
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one_time_key_buffer, len(one_time_key),
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random_buffer, r_length
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)
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def create_inbound(self, account, one_time_key_message):
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one_time_key_message_buffer = create_string_buffer(
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one_time_key_message
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)
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lib.olm_create_inbound_session(
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self.ptr,
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account.ptr,
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one_time_key_message_buffer, len(one_time_key_message)
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)
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def create_inbound_from(self, account, identity_key, one_time_key_message):
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identity_key_buffer = create_string_buffer(identity_key)
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one_time_key_message_buffer = create_string_buffer(
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one_time_key_message
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)
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lib.olm_create_inbound_session_from(
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self.ptr,
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account.ptr,
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identity_key_buffer, len(identity_key),
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one_time_key_message_buffer, len(one_time_key_message)
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)
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def session_id(self):
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id_length = lib.olm_session_id_length(self.ptr)
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id_buffer = create_string_buffer(id_length)
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lib.olm_session_id(self.ptr, id_buffer, id_length)
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return id_buffer.raw
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def matches_inbound(self, one_time_key_message):
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one_time_key_message_buffer = create_string_buffer(
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one_time_key_message,
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)
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return bool(lib.olm_matches_inbound_session(
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self.ptr,
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one_time_key_message_buffer, len(one_time_key_message)
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))
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def matches_inbound_from(self, identity_key, one_time_key_message):
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identity_key_buffer = create_string_buffer(identity_key)
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one_time_key_message_buffer = create_string_buffer(
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one_time_key_message,
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)
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return bool(lib.olm_matches_inbound_session(
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self.ptr,
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identity_key_buffer, len(identity_key),
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one_time_key_message_buffer, len(one_time_key_message)
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))
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def encrypt(self, plaintext):
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r_length = lib.olm_encrypt_random_length(self.ptr)
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random = urandom(r_length)
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random_buffer = create_string_buffer(random)
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message_type = lib.olm_encrypt_message_type(self.ptr)
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message_length = lib.olm_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_encrypt(
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self.ptr,
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plaintext_buffer, len(plaintext),
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random_buffer, r_length,
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message_buffer, message_length,
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)
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return message_type, message_buffer.raw
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def decrypt(self, message_type, message):
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message_buffer = create_string_buffer(message)
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max_plaintext_length = lib.olm_decrypt_max_plaintext_length(
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self.ptr, message_type, 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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plaintext_length = lib.olm_decrypt(
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self.ptr, message_type, message_buffer, len(message),
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plaintext_buffer, max_plaintext_length
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)
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return plaintext_buffer.raw[:plaintext_length]
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def clear(self):
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pass
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