Add python ctypes bindings and a command line script using them
This commit is contained in:
Mark Haines
parent
76f49cf177
commit
499f680f5b
1 changed files with 436 additions and 0 deletions
436
axolotl.py
Executable file
436
axolotl.py
Executable file
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#! /usr/bin/python
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from ctypes import *
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import json
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lib = cdll.LoadLibrary("build/libaxolotl.so")
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lib.axolotl_error.argtypes = []
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lib.axolotl_error.restypes = c_size_t
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ERR = lib.axolotl_error()
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class AxolotlError(Exception):
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pass
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lib.axolotl_account_size.argtypes = []
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lib.axolotl_account_size.restype = c_size_t
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lib.axolotl_account.argtypes = [c_void_p]
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lib.axolotl_account.restype = c_void_p
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lib.axolotl_account_last_error.argtypes = [c_void_p]
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lib.axolotl_account_last_error.restype = c_char_p
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def account_errcheck(res, func, args):
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if res == ERR:
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raise AxolotlError("%s: %s" % (
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func.__name__, lib.axolotl_account_last_error(args[0])
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))
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return res
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def account_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 = account_errcheck
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account_function(
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lib.axolotl_pickle_account, c_void_p, c_size_t, c_void_p, c_size_t
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)
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account_function(
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lib.axolotl_unpickle_account, c_void_p, c_size_t, c_void_p, c_size_t
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)
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account_function(lib.axolotl_create_account_random_length)
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account_function(lib.axolotl_create_account, c_void_p, c_size_t)
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account_function(lib.axolotl_account_identity_keys_length)
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account_function(lib.axolotl_account_identity_keys, c_void_p, c_size_t)
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account_function(lib.axolotl_account_one_time_keys_length)
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account_function(lib.axolotl_account_one_time_keys, c_void_p, c_size_t)
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def read_random(n):
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with open("/dev/urandom", "rb") as f:
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return f.read(n)
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class Account(object):
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def __init__(self):
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self.buf = create_string_buffer(lib.axolotl_account_size())
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self.ptr = lib.axolotl_account(self.buf)
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def create(self):
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random_length = lib.axolotl_create_account_random_length(self.ptr)
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random = read_random(random_length)
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random_buffer = create_string_buffer(random)
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lib.axolotl_create_account(self.ptr, random_buffer, random_length)
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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.axolotl_pickle_account_length(self.ptr)
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pickle_buffer = create_string_buffer(pickle_length)
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lib.axolotl_pickle_account(
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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.axolotl_unpickle_account(
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self.ptr, key_buffer, len(key), pickle_buffer, len(pickle)
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)
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def identity_keys(self):
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out_length = lib.axolotl_account_identity_keys_length(self.ptr)
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out_buffer = create_string_buffer(out_length)
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lib.axolotl_account_identity_keys(self.ptr, out_buffer, out_length)
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return json.loads(out_buffer.raw)
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def one_time_keys(self):
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out_length = lib.axolotl_account_one_time_keys_length(self.ptr)
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out_buffer = create_string_buffer(out_length)
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lib.axolotl_account_one_time_keys(self.ptr, out_buffer, out_length)
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return json.loads(out_buffer.raw)
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def clear(self):
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pass
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lib.axolotl_session_size.argtypes = []
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lib.axolotl_session_size.restype = c_size_t
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lib.axolotl_session.argtypes = [c_void_p]
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lib.axolotl_session.restype = c_void_p
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lib.axolotl_session_last_error.argtypes = [c_void_p]
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lib.axolotl_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 AxolotlError("%s: %s" % (
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func.__name__, lib.axolotl_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.axolotl_session_last_error)
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session_function(
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lib.axolotl_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.axolotl_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.axolotl_create_outbound_session_random_length)
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session_function(
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lib.axolotl_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_uint, # One Time Key Id
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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.axolotl_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(lib.axolotl_matches_inbound_session, c_void_p, c_size_t)
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session_function(lib.axolotl_encrypt_message_type)
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session_function(lib.axolotl_encrypt_random_length)
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session_function(lib.axolotl_encrypt_message_length, c_size_t)
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session_function(
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lib.axolotl_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.axolotl_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.axolotl_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.axolotl_session_size())
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self.ptr = lib.axolotl_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.axolotl_pickle_session_length(self.ptr)
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pickle_buffer = create_string_buffer(pickle_length)
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lib.axolotl_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.axolotl_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_id,
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one_time_key):
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r_length = lib.axolotl_create_outbound_session_random_length(self.ptr)
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random = read_random(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.axolotl_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_id,
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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(one_time_key_message)
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lib.axolotl_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 matches_inbound(self, one_time_key_message):
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one_time_key_message_buffer = create_string_buffer(one_time_key_message)
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return bool(lib.axolotl_create_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 encrypt(self, plaintext):
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r_length = lib.axolotl_encrypt_random_length(self.ptr)
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random = read_random(r_length)
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random_buffer = create_string_buffer(random)
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message_type = lib.axolotl_encrypt_message_type(self.ptr)
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message_length = lib.axolotl_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.axolotl_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.axolotl_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.axolotl_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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if __name__ == '__main__':
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import argparse
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import sys
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import os
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import yaml
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parser = argparse.ArgumentParser()
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parser.add_argument("--key", help="Account encryption key", default="")
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commands = parser.add_subparsers()
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create_account = commands.add_parser("create_account", help="Create a new account")
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create_account.add_argument("account_file", help="Local account file")
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def do_create_account(args):
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if os.path.exists(args.account_file):
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sys.stderr.write("Account %r file already exists" % (
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args.account_file,
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))
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sys.exit(1)
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account = Account()
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account.create()
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with open(args.account_file, "wb") as f:
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f.write(account.pickle(args.key))
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create_account.set_defaults(func=do_create_account)
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keys = commands.add_parser("keys", help="List public keys for an account")
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keys.add_argument("account_file", help="Local account_file")
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def do_keys(args):
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account = Account()
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with open(args.account_file, "rb") as f:
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account.unpickle(args.key, f.read())
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(r_id, id_key), (signed_id, signed_key) = account.identity_keys()
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ot_keys = account.one_time_keys()
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result1 = {
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"identityKey": str(id_key),
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"signedKey": {
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"keyId": signed_id,
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"publicKey": str(signed_key),
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},
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"lastResortKey": {
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"keyId": ot_keys[0][0],
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"publicKey": str(ot_keys[0][1]),
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},
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}
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result2 = {
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"oneTimeKeys": [{
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"keyId": k[0],
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"publicKey": str(k[1]),
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} for k in ot_keys[1:]]
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}
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try:
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yaml.dump(result1, sys.stdout, default_flow_style=False)
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yaml.dump(result2, sys.stdout, default_flow_style=False)
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except:
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pass
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keys.set_defaults(func=do_keys)
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outbound = commands.add_parser("outbound", help="Create an outbound session")
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outbound.add_argument("account_file", help="Local account file")
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outbound.add_argument("session_file", help="Local session file")
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outbound.add_argument("identity_key", help="Remote identity key")
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outbound.add_argument("signed_key_id", help="Remote signed key id",
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type=int)
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outbound.add_argument("signed_key", help="Remote signed key")
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outbound.add_argument("one_time_key_id", help="Remote one time key id",
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type=int)
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outbound.add_argument("one_time_key", help="Remote one time key")
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def do_outbound(args):
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if os.path.exists(args.session_file):
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sys.stderr.write("Session %r file already exists" % (
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args.account_file,
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))
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sys.exit(1)
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account = Account()
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with open(args.account_file, "rb") as f:
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account.unpickle(args.key, f.read())
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session = Session()
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session.create_outbound(
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account, args.identity_key, args.signed_key_id, args.signed_key,
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args.one_time_key_id, args.one_time_key
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)
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with open(args.session_file, "wb") as f:
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f.write(session.pickle(args.key))
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outbound.set_defaults(func=do_outbound)
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def open_in(path):
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if path == "-":
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return sys.stdin
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else:
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return open(path, "rb")
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def open_out(path):
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if path == "-":
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return sys.stdout
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else:
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return open(path, "wb")
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inbound = commands.add_parser("inbound", help="Create an inbound session")
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inbound.add_argument("account_file", help="Local account file")
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inbound.add_argument("session_file", help="Local session file")
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inbound.add_argument("message_file", help="Message", default="-")
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inbound.add_argument("plaintext_file", help="Plaintext", default="-")
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def do_inbound(args):
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if os.path.exists(args.session_file):
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sys.stderr.write("Session %r file already exists" % (
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args.account_file,
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))
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sys.exit(1)
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account = Account()
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with open(args.account_file, "rb") as f:
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account.unpickle(args.key, f.read())
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with open_in(args.message_file) as f:
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message_type = f.read(8)
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message = f.read()
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if message_type != "PRE_KEY ":
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sys.stderr.write("Expecting a PRE_KEY message")
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sys.exit(1)
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session = Session()
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session.create_inbound(account, message)
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plaintext = session.decrypt(0, message)
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with open(args.session_file, "wb") as f:
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f.write(session.pickle(args.key))
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with open_out(args.plaintext_file) as f:
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f.write(plaintext)
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inbound.set_defaults(func=do_inbound)
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encrypt = commands.add_parser("encrypt", help="Encrypt a message")
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encrypt.add_argument("session_file", help="Local session file")
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encrypt.add_argument("plaintext_file", help="Plaintext", default="-")
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encrypt.add_argument("message_file", help="Message", default="-")
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def do_encrypt(args):
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session = Session()
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with open(args.session_file, "rb") as f:
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session.unpickle(args.key, f.read())
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with open_in(args.plaintext_file) as f:
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plaintext = f.read()
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message_type, message = session.encrypt(plaintext)
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with open(args.session_file, "wb") as f:
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f.write(session.pickle(args.key))
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with open_out(args.message_file) as f:
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f.write(["PRE_KEY ", "MESSAGE "][message_type])
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f.write(message)
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encrypt.set_defaults(func=do_encrypt)
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decrypt = commands.add_parser("decrypt", help="Decrypt a message")
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decrypt.add_argument("session_file", help="Local session file")
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decrypt.add_argument("plaintext_file", help="Plaintext", default="-")
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decrypt.add_argument("message_file", help="Message", default="-")
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def do_decrypt(args):
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session = Session()
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with open(args.session_file, "rb") as f:
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session.unpickle(args.key, f.read())
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with open_in(args.message_file) as f:
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message_type = f.read(8)
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message = f.read()
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if message_type not in {"PRE_KEY ", "MESSAGE "}:
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sys.stderr.write("Expecting a PRE_KEY or MESSAGE message")
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sys.exit(1)
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message_type = 1 if message_type == "MESSAGE " else 0
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plaintext = session.decrypt(message_type, message)
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with open(args.session_file, "wb") as f:
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f.write(session.pickle(args.key))
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with open_out(args.plaintext_file) as f:
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f.write(plaintext)
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decrypt.set_defaults(func=do_decrypt)
|
||||
|
||||
args = parser.parse_args()
|
||||
args.func(args)
|
||||
|
||||
|
||||
Loading…
Reference in a new issue