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Author SHA1 Message Date
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
d8b24acb77 PR feedback 
* write V1 pickles on the master branch
* the logging branch is going to write v0x80000001
 2016-06-30 14:01:02 +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
ee8172d882 Compile some of the crypto libs directly 
sha256.c and aes.c contain conflicting declarations, so we need to compile them
as separate units. This requires a bit more Makefile-shuffling; the build
directory now includes 'src' or 'lib' as appropriate, and we just mkdir -p
before each compilation.
 2016-05-25 17:08:44 +01:00
Richard van der Hoff
27b57c8d88 Merge branch 'rav/more_group_chat/1' 2016-05-25 15:46:50 +01:00
Richard van der Hoff
fae8dacab5 Add a comment explaining Mark's latest fix 2016-05-25 15:44:39 +01:00
Mark Haines
19a7fb5df5 Fix an integer wrap around bug and add a couple more tests 2016-05-25 15:00:05 +01:00
Richard van der Hoff
01ea3d4b9a Fix handling of integer wraparound in megolm.c 2016-05-24 17:52:35 +01:00
Richard van der Hoff
1f31427139 megolm_advance_to: Remove excessive optimisation 
There was some slightly overcomplex logic designed to save a couple of hash
operations when R(0) and R(1) were advanced, but the extra code was hard to
understand and didn't save much.
 2016-05-24 17:38:43 +01:00
Richard van der Hoff
ef8d24f483 megolm.c: rewrite counter update 
We no longer need to keep track of intermediate values of the counter, which
means we can update it much more easily.
 2016-05-24 17:33:41 +01:00
Richard van der Hoff
f3c0dd76d7 megolm.c: Remove spurious arguments to rehash_part 
These were left over from when rehash_part did a bunch of logging.
 2016-05-24 17:03:42 +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
15cb4ec0c0 Build the crypto libs as C99 
Some of the crypto libs rely on UINT64_C, which in glibc 2.17 and earlier was
not defined for C++ code (see
https://sourceware.org/bugzilla/show_bug.cgi?id=15366).
 2016-05-24 14:41:49 +01:00
Richard van der Hoff
fa1e9446ac Use _olm_unset instead of memset 
memset is at risk of being optimised away, so use _olm_unset instead.
 2016-05-24 13:40:21 +01:00
Richard van der Hoff
173cbe112c Avoid relying on uint -> int casting behaviour 
The behaviour when casting from a uint32_t which has overflowed (so has the top
bit set) to int32_t is implementation-defined, so let's avoid relying on it.
 2016-05-24 13:40:21 +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
a073d12d83 Support for pickling inbound group sessions 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
2e7800cf65 Merge branch 'rav/c_bindings' 2016-05-24 13:33:33 +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
Mark Haines
b1c5732fc8 Fix bug in bounds check when parsing 2016-05-23 19:37:58 +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
182f33f8ae Complete fixes for olm_*_last_error 
Should have been in the previous commit :/
 2016-05-23 18:54:18 +01:00
Richard van der Hoff
f69577ad99 fix range check in olm_*_last_errror 2016-05-23 18:53:14 +01:00
Richard van der Hoff
c8c5f35bb4 crypto.cpp: Fix comments 
These seem to be the wrong way around.
 2016-05-20 15:37:33 +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
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
Richard van der Hoff
25953b350b Use header files where possible 
This fixes an incorrect re-declaration of ed25519_sign.

Implement header files for some of the other library bits so that we don't need
to declare functions in crypto.cpp.
 2015-12-03 17:08:04 +00:00
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
159faa1e2b Make the internal functions static, remove some unused internal functions 2015-08-18 17:09:55 +01:00
Mark Haines
158f7ee891 Fix crash where the message length was shorter than the length of the mac 2015-08-07 19:33:48 +01:00
Mark Haines
a4b2927884 Initialise the length fields of the reader struct in decode_message, even if the message is invalid, fixes a crash where the message was too short 2015-08-07 18:58:42 +01:00
Mark Haines
76ecd85c2c Fix a crash when decoding messages that are too short 2015-08-07 18:25:21 +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
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
a59fbdfe7f Add a test for pickling and unpickling sessions, fix off by one error when unpickling sessions 2015-07-14 11:32:11 +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
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
f10c04d62d reduce the number of one time keys that get generated when we create an account 2015-06-23 17:49:04 +01:00
Mark Haines
8bf32c3248 Fix bug encoding integers larger than 128 2015-06-23 17:47:48 +01:00
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
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
76f49cf177 Add a test for the axolotl API 2015-06-16 15:15:40 +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
28541dd82a Implement the session key exchange 2015-06-22 14:30:46 +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