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Change interface to allow the app to get the private part of the
key and instantiate a decryption object from just the private part
of the key.
Changes the function generating a key from random bytes to be
initialising a key with a private key (because it's exactly the
same thing). Exports & imports private key parts as ArrayBuffer at
JS level rather than base64 assuming we are moving that way in
general.
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Don't think this matters since there's no PkEncryption /
PkDecryption object being passed, but for the sake of consistency
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So we only init the library once.
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Change the interface again, hopefully this time a bit more normal.
Now we wrap the emscripten module completely and just expose the
high level objects.
The olm library export is now imported as normal (ie. returns
a module rather than a function returning a module) but has an
`init` method which *must* be called. This returns a promise
which resolves when the module is ready. It also rejects if the
module failed to set up, unlike before (and unlike the
promise-not-a-promise that emscripten returns).
Generally catch failures to init the module.
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The closure compiler was just renaming the variable so it never
would have picked them up. Make it an extern so it knows what to do.
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Quite a lot going on in this PR:
* Updates to support recent emscripten, switching to WASM which is now the default
* Use emscripten's MODULARIZE option rather than wrapping it ourself, since doing
so in pre-post js doesn't work anymore.
* Most changes are moving the emscripten runtime functions to top-level
calls rather than in the Module object.
* Get rid of duplicated NULL_BYTE_PADDING_LENGTH
* Fix ciphertext_length used without being declared
* Fix things that caused the closure compiler to error, eg. using
OLM_OPTIONS without a declaration.
* Wait until module is inited to do OLM_ERROR = olm_error()
The main BREAKING CHANGE here is that the module now needs to initialise
asyncronously (because it has to load the wasm file). require()ing olm
now gives a function which needs to be called to create an instance.
The resulting object has a promise-like then() method that can be used
to detect when the module is ready. (We could use MODULARIZE_INSTANCE
to return the module directly as before, rather than the function,
but then we don't get the .then() method).
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From 4a82d31e8cb808a04956fc847ed0ec0ff322b956 Mon Sep 17 00:00:00 2001
From: Hubert Chathi <hubert@uhoreg.ca>
Date: Wed, 3 Jan 2018 21:37:43 -0500
Subject: [PATCH] fix some typos in JavaScript library
Signed-off-by: Hubert Chathi <hubert@uhoreg.ca>
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olm_import_inbound_group_session, which reads the format written by
olm_export_inbound_group_session to initialise a group session.
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A pair of functions which allow you to export the megolm keys for an inbound
group session, so that an application can save/restore them.
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These would have helped avoid the recent FRV.
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Make sure we null-terminate encrypted strings before passing them to
UTF8ToString.
This used to work when we allocated the buffer on the stack, because it turns
out that allocate() zeroinits the returned memory. malloc(), of course, does
not.
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Allocate memory for message blobs on the heap
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Avoid leaving copies of the plaintext sitting around in the emscripten heap.
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Messages can be very large, so we don't really want to allocate them on the
stack. Switch to using the heap for them, and try to clean up some of the
string handling while we're at it.
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Read settings from OLM_OPTIONS to allow apps to configure some options. In
particular, this is useful for setting the heap size.
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If we get an exception during load, don't define half of window.Olm (which
confuses apps).
This is a partial fix to https://github.com/vector-im/riot-web/issues/2726.
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Applications can use the index to detect replays of the same message.
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Remove the messsage index from olm_init_inbound_group_session
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read from the session_key
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Remove redundant args from some js funcs, and fix a comment typo
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Fix a couple of places where we were using the wrong method to get the last
error.
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