Merge branch 'rav/refactor_python_wrappers'

1 files changed, 192 insertions, 0 deletions

diff --git a/python/olm/session.py b/python/olm/session.py
new file mode 100644
index 0000000..308f220
--- /dev/null
+++ b/python/olm/session.py
@@ -0,0 +1,192 @@
+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_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