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152 commits

Author SHA1 Message Date
Mark Haines
6971f54fea Add a olm_inbound_group_session_id method 2016-09-13 17:02:36 +01:00
Richard van der Hoff
2fc83aa9ac Sign megolm messages 
Add ed25519 keys to the inbound and outbound sessions, and use them to sign and
verify megolm messages.

We just stuff the ed25519 public key in alongside the megolm session key (and
add a version byte), to save adding more boilerplate to the JS/python/etc
layers.
 2016-09-06 15:26:26 +01:00
Richard van der Hoff
50cd2b2a43 Clean up some typos 
Remove redundant args from some js funcs, and fix a comment typo
 2016-09-06 14:06:43 +01:00
Richard van der Hoff
833ecd3c73 Convert ed25519 pickling functions to C 
... so that I can use them from the group session bits.
 2016-09-05 12:59:12 +01:00
Richard van der Hoff
69f269ffaf Convert AES functions to plain C 2016-09-05 10:40:39 +01:00
Richard van der Hoff
f0acf6582f Convert Ed25519 and Curve25519 functions to plain C 2016-09-05 10:40:39 +01:00
Richard van der Hoff
2aad4cfa86 Merge pull request #15 from matrix-org/rav/has_received_message 
OlmSession.has_received_message
 2016-09-05 10:38:41 +01:00
Richard van der Hoff
2e9021c2e7 OlmSession.has_received_message 
I find myself wanting to know if an OlmSession is in the pre-key state or not,
to help debugging at the application level.
 2016-09-04 23:41:10 +01:00
Richard van der Hoff
39212987bd Create new constants for key lengths, etc 
We were using olm::KEY_LENGTH for everything under the sun which happened to be
32 bytes long, and making a bunch of assumptions in the process. Create a bunch
of new constants (as C #defines rather than C++ consts so that I can use them
in another forthcoming refactor).
 2016-09-02 15:11:14 +01:00
Richard van der Hoff
0c462cff11 Fix Ed25519 keypair generation 
Ed25519 private keys, it turns out, have 64 bytes, not 32.

We were previously generating only 32 bytes (which is all that is required to
generate the public key), and then using the public key as the upper 32 bytes
when generating the per-message session key. This meant that everything
appeared to work, but the security of the private key was severely compromised.

By way of fixes:

 * Use the correct algorithm for generating the Ed25519 private key, and store
   all 512 bits of it.

 * Update the account pickle format and refuse to load the old format (since we
   should consider it compromised).

 * Bump the library version, and add a function to retrieve the library
   version, so that applications can verify that they are linked against a
   fixed version of the library.

 * Remove the curve25519_{sign, verify} functions which were unused and of
   dubious quality.
 2016-09-01 13:35:23 +01:00
Richard van der Hoff
8dd3c182ee Make space in the session pickle for chain index 
Keeping track of the chain index is a useful thing to do, but is only required
if we've enabled diagnostics. Extend the session pickle format to make a space
for it, so that pickles can be transferred between the logging_enabled branch
and the master branch without loss of information.

Also add some tests for session pickling which explicitly check that we can
unpickle both formats of pickle.
 2016-06-30 11:38:01 +01:00
Richard van der Hoff
757c422578 Remove unused 'chain_index' from Ratchet 
This was introduced when I was experimenting with support for logging progress
in Olm. That is now relegated to the logging_enabled branch, so this should
probably be removed.

This also fixes the incompatibility of session pickles from the current master
branch with those from olm 0.1.0.
 2016-06-30 11:31:36 +01:00
Richard van der Hoff
708fddd747 Remove session_id from group messages 
Putting the session_id inside the packed message body makes it hard to extract
so that we can decide which session to use. We don't think there is any
advantage to having thes sesion_id protected by the HMACs, so we're going to
move it to the JSON framing.
 2016-05-25 17:42:32 +01:00
Richard van der Hoff
1b15465c42 Separate base64ing from the rest of msg encoding 
Factor the actual message encoding/decoding and encrypting/decrypting out to
separate functions from the top-level functions which do the base64-wrangling.

This is particularly helpful in the 'outbound' code-path where the offsets
required to allow room to base64-encode make the flow hard to see when it's all inline.
 2016-05-24 16:23:19 +01:00
Richard van der Hoff
a919a149fb Update megolm_cipher as a global struct 
Initialise megolm_cipher via the preprocessor macro, instead of with a
function.
 2016-05-24 14:54:01 +01:00
Richard van der Hoff
fc4756ddf1 Fix up some names, and protobuf tags 
Make names (of session_key and message_index) more consistent.

Use our own protobuf tags rather than trying to piggyback on the one-to-one
structure.
 2016-05-24 13:40:21 +01:00
Richard van der Hoff
39ad75314b Implement decrypting inbound group messages 
Includes creation of inbound sessions, etc
 2016-05-24 13:39:34 +01:00
Richard van der Hoff
8b1514c0a6 Implement functions to get the state of outbound session 
We need to be able to inspect an outbound session so that we can tell our peer
how to set up an inbound session.
 2016-05-24 13:39:34 +01:00
Richard van der Hoff
c058554132 Implement pickling/unpickling for outbound group sessions 2016-05-24 13:39:34 +01:00
Richard van der Hoff
caaed796ad Implementation of an outbound group session 2016-05-24 13:39:34 +01:00
Richard van der Hoff
68d3c7bfa9 Implementation of the megolm ratchet 2016-05-24 13:39:34 +01:00
Richard van der Hoff
42a300fc62 Factor out pickle_encoding from olm.cpp 
We don't need to have all of the top-level pickling functions in olm.cpp;
factor out the utilities to support it to pickle_encoding.cpp (and make sure
that they have plain-C bindings).
 2016-05-24 13:39:32 +01:00
Richard van der Hoff
256bce10fc Factor out olm_error_to_string to a separate file 
I want to be able to use this functionality from elsewhere, so factor it out to
its own file.
 2016-05-24 13:35:28 +01:00
Richard van der Hoff
2fd28a6682 Rewrite _olm_cipher_aes_sha_256 initialisation 
Replace the init-static-var dance with some preprocessor macros
 2016-05-24 12:06:47 +01:00
Richard van der Hoff
d4a3c8dbaa Remove 'destruct' from cipher_ops 
We never delete a cipher, and the destruct op is empty, so it's a bit pointless
 2016-05-24 09:56:01 +01:00
Richard van der Hoff
444ef1f706 Prefix for internal symbols 
Give a load of internal symbols "_olm_" prefixes. This better delineates the
public and private interfaces in the module, and helps avoid internal symbols
leaking out and possibly being abused.
 2016-05-23 18:55:06 +01:00
Richard van der Hoff
c57b2b71c5 C bindings for base64 functions 2016-05-23 18:55:06 +01:00
Richard van der Hoff
a1855b99b9 C binding for olm::unset 2016-05-23 18:55:05 +01:00
Richard van der Hoff
07b33acee5 C bindings for pickle functions 2016-05-23 18:55:05 +01:00
Richard van der Hoff
294cf482ea Convert cipher.hh to plain C 2016-05-23 18:55:05 +01:00
Richard van der Hoff
f9139dfa6a Convert error.hh to plain C 2016-05-23 18:55:05 +01:00
Richard van der Hoff
e533b0dc8e Give SHA256 functions C bindings 2016-05-23 18:55:05 +01:00
Richard van der Hoff
4f1bb49d20 Rename olm.hh to olm.h 2016-05-23 18:55:05 +01:00
Richard van der Hoff
acae4e8438 Remove functions which return strings 
We don't want anything which does dynamic memory allocation in the library.
 2016-05-20 15:07:10 +01:00
Richard van der Hoff
2a09ccbd63 Remove vestiges of logging 
Remove the (now non-functional) declarations of olm_set_log_level in the C and
js wrappers.
 2016-05-16 11:50:44 +01:00
Richard van der Hoff
3965320a9c Remove logging functionality 
Concerns have been raised that including logging functionality makes it harder
to audit the implementation to ensure that no secret information is leaked. We
are therefore removing it from the master branch.
 2016-05-16 11:13:54 +01:00
Richard van der Hoff
b3db0e6ee1 translate logging.cpp to C 2016-05-16 11:05:57 +01:00
Richard van der Hoff
48cb5f925d Add olm::log_enabled_for 2016-05-16 11:04:26 +01:00
Richard van der Hoff
11dbf2aab3 Fix a bunch of compiler warnings, and turn on warnings. 2016-04-26 18:10:13 +01:00
Richard van der Hoff
9848f84452 Add some logging to help understand what's going on 2016-04-26 17:55:26 +01:00
Richard van der Hoff
e7a2af1ede Add a basic logging implementation 2016-04-26 12:30:18 +01:00
Mark Haines
5e1b8a5b3b Add docstrings for the utility class 2015-08-20 10:08:15 +01:00
Mark Haines
7649125a9e Add docstrings for the Session methods 2015-08-19 18:16:47 +01:00
Mark Haines
b318055185 Replace hard coded references to the 32-byte key length with a constant, add utilities for copying data to and from fixed sized arrays 2015-08-19 17:32:06 +01:00
Mark Haines
a378a40b3a Document that the ciphertext and plaintext may share a buffer when encrypting and decrypting 2015-08-19 15:39:19 +01:00
Mark Haines
900d2d70b4 Add docstring for the base64 encode/decode methods 2015-08-19 15:38:20 +01:00
Mark Haines
c35d1d420f Check that the end of input hasn't been reached when unpickling a list 2015-08-11 13:14:06 +01:00
Mark Haines
39c1f3b355 Add methods for computing sha256 hashes and validating ed25519 signatures 2015-07-24 14:29:52 +01:00
Mark Haines
3468886e27 Add method getting a session id. Update the python and javascript bindings 2015-07-16 11:45:20 +01:00
Mark Haines
89d9b972a6 Add versions of olm_session_create_inbound and olm_session_matches_inbound which take the curve25519 identity key of the remote device we think the message is from as an additional argument 2015-07-16 10:45:10 +01:00
Mark Haines
3bfa8e5863 Fix bug in list where the wrong value was copied if an item was inserted at the beinging of the list 2015-07-15 16:31:45 +01:00
Mark Haines
137aa31e95 olm_account_last_error and olm_clear_account should take an Account not a Session 2015-07-15 13:24:26 +01:00
Mark Haines
2e49a6f41e Clear the random buffers once they've been used. Add methods for clearing the account and session object once they've been used 2015-07-10 18:29:14 +01:00
Mark Haines
5ad929104e Version the pickled objects and check for errors when unpickling them 2015-07-10 18:00:18 +01:00
Mark Haines
b6e248c9a5 Output simpler JSON for the account keys, don't sign the JSON but instead provide a olm_account_sign method so that the user of the library can sign the JSON themselves 2015-07-10 11:57:53 +01:00
Mark Haines
373acefde7 Add c bindings for the methods for managing one time keys 2015-07-09 18:35:54 +01:00
Mark Haines
5634be0507 Add methods for generating new one time keys and for tracking which one time keys have been published 2015-07-09 16:09:16 +01:00
Mark Haines
0e988237f6 Don't pass a key id when creating a new outbound session 2015-07-08 16:04:18 +01:00
Mark Haines
532dc0d4e7 Change the JSON format for one time keys to include what algorithm they are for 2015-07-08 15:30:34 +01:00
Mark Haines
dceae043b3 Remove the RemoteKey type since it wasn't being used 2015-07-08 14:57:55 +01:00
Mark Haines
5291ec78b5 Send the public part of the one time key rather than passing an identifier 2015-07-08 14:53:25 +01:00
Mark Haines
974e0984bd Update the javascript bindings and demo to match the format of the identity key JSON 2015-07-08 11:16:00 +01:00
Mark Haines
3a382aec59 Encode the account keys as a signed JSON object 2015-07-07 16:42:03 +01:00
Mark Haines
2a873fd4e1 Add functions for creating and verifying ed25519 signatures 2015-07-07 09:50:32 +01:00
Mark Haines
a30a64d179 Rename generate_key to curve25519_generate_key 2015-07-07 09:03:12 +01:00
Mark Haines
f1cd5613f6 Remove the last resort one time key 2015-07-07 09:01:38 +01:00
Mark Haines
667e415c74 Removed SignedKey class 2015-07-07 08:56:18 +01:00
Matthew Hodgson
17aa7e6580 remove rogue axolotls 2015-06-28 17:56:40 +02:00
Matthew Hodgson
09d4125ff1 Rename axolotlpp as olm to avoid confusion with Axolotl-the-spec and Axolotl-the-OWS-libraries at moxie's request 2015-06-27 01:15:23 +02:00
Mark Haines
10e7e8123d Add missing include, fix bug in handling unknown message fields 2015-06-23 15:15:18 +01:00
Mark Haines
39a0873309 This field isn't being used anywhere so don't bother including it in the messages 2015-06-23 10:03:41 +01:00
Mark Haines
3f475ab2f8 Note that the input buffers are destroyed by some of the account and session methods 2015-06-22 18:00:34 +01:00
Mark Haines
043bc43716 Copyright Notices 2015-06-22 17:50:56 +01:00
Mark Haines
492dc1ab58 Add API docs for the axolotl.hh methods 2015-06-22 17:44:56 +01:00
Mark Haines
408530adf9 Add API for removing used one time keys 2015-06-22 11:02:42 +01:00
Mark Haines
4abead9e9e Add c interface which wraps the cpp classes 2015-06-15 17:49:20 +01:00
Mark Haines
7cdde73560 Add base64 encoders and decoders 2015-06-15 17:48:09 +01:00
Mark Haines
026e4394bb Implement creating a new account 2015-06-15 17:47:22 +01:00
Mark Haines
6fe3b7eb73 Move utils for pickling into a separate file 2015-06-12 16:15:37 +01:00
Mark Haines
6ecea67718 Implement the session key exchange 2015-06-12 14:09:41 +01:00
Mark Haines
08a7e44a96 Pass the message body to decrypt_max_plaintext_length so we can get a more accurate estimate, rename encrypt_max_output_length to encrypt_output_length and change the api to return the exact number of bytes needed to hold the message 2015-06-12 09:08:15 +01:00
Mark Haines
793b9b910a Start writing the interfaces for session and the account objects 2015-06-11 18:03:22 +01:00
Mark Haines
bcb05d1a99 rename Session to Ratchet 2015-06-11 16:10:55 +01:00
Mark Haines
e44c82a7b4 Add encoder and decoder for PreKey messages 2015-06-11 15:57:45 +01:00
Mark Haines
816435a860 Move AES specific details behind a cipher interface 2015-06-11 14:20:35 +01:00
Mark Haines
a08d706366 Add methods for pickling and unpickling sessions 2015-06-09 18:03:01 +01:00
Mark Haines
8123ce6209 Constant time comparison for mac 2015-03-03 15:08:56 +00:00
Mark Haines
a0e9065f1f Rename the ratchet source and include files from axolotl to ratchet 2015-03-03 11:50:17 +00:00
Mark Haines
315caaba7e Add functions for signing and verifying messages using curve25519 keys 2015-03-03 11:18:07 +00:00
Mark Haines
c7419e7cdf Try to ensure the compiler cannot optimise away attempts to erase secrets from memory 2015-02-27 16:11:30 +00:00
Mark Haines
b3496b0aa1 More comments 2015-02-27 15:07:45 +00:00
Matthew Hodgson
65bb5d4e5b if you type axolotl a lotl you get it wrong 2015-02-27 13:09:17 +01:00
Mark Haines
d142eb64dd Copyright notices and a license 2015-02-26 16:56:25 +00:00
Mark Haines
09d8e84c7c Implement the axlotl ratchet 2015-02-26 16:30:19 +00:00
Mark Haines
186df91246 Start implementing the ratchet 2015-02-25 17:33:23 +00:00
Mark Haines
a4e5bf9772 Don't bother passing through the mac_length, the caller already knows it since they supplied it 2015-02-25 17:33:00 +00:00
Mark Haines
ba446e7a12 Add a message encoder/decoder 2015-02-25 11:20:12 +00:00
Mark Haines
8df4d9e9b5 Tweak AES cbc to add pcks7 padding bytes 2015-02-25 08:35:53 +00:00
Mark Haines
38332e0a12 Add a simple fixed size list class 2015-02-24 11:30:28 +00:00
Mark Haines
7c1da4896f Use stdout for reporting test success/failure 2015-02-23 14:45:36 +00:00