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Merge pull request #57 from matrix-org/dbkr/wasm

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WebAssembly support
This commit is contained in:
David Baker 2018-10-10 20:07:19 +01:00 committed by GitHub
commit 3cfcf1615d
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16 changed files with 192 additions and 103 deletions
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8
CHANGELOG.rst
View file

@ -1,3 +1,11 @@
Changes in latest release
BREAKING CHANGE: Olm now uses WebAssembly which means it needs
to load the wasm file asynchronously, and therefore needs to be
started up asynchronously. The imported module now has an init()
method which returns a promise. The library cannot be used until
this promise resolves. It will reject if the library fails to start.
Changes in `2.3.0 <http://matrix.org/git/olm/commit/?h=2.3.0>`_
This release includes the following changes since 2.2.2:

59
Makefile
View file

@ -27,9 +27,12 @@ endif
RELEASE_TARGET := $(BUILD_DIR)/libolm.$(SO).$(VERSION)
STATIC_RELEASE_TARGET := $(BUILD_DIR)/libolm.a
DEBUG_TARGET := $(BUILD_DIR)/libolm_debug.$(SO).$(VERSION)
JS_TARGET := javascript/olm.js
JS_WASM_TARGET := javascript/olm.js
JS_ASMJS_TARGET := javascript/olm_legacy.js
JS_EXPORTED_FUNCTIONS := javascript/exported_functions.json
JS_EXTRA_EXPORTED_RUNTIME_METHODS := ALLOC_STACK
JS_EXTERNS := javascript/externs.js
PUBLIC_HEADERS := include/olm/olm.h include/olm/outbound_group_session.h include/olm/inbound_group_session.h include/olm/pk.h
@ -49,11 +52,22 @@ FUZZER_BINARIES := $(addprefix $(BUILD_DIR)/,$(basename $(FUZZER_SOURCES)))
FUZZER_DEBUG_BINARIES := $(patsubst $(BUILD_DIR)/fuzzers/fuzz_%,$(BUILD_DIR)/fuzzers/debug_%,$(FUZZER_BINARIES))
TEST_BINARIES := $(patsubst tests/%,$(BUILD_DIR)/tests/%,$(basename $(TEST_SOURCES)))
JS_OBJECTS := $(addprefix $(BUILD_DIR)/javascript/,$(OBJECTS))
# pre & post are the js-pre/js-post options to emcc.
# They are injected inside the modularised code and
# processed by the optimiser.
JS_PRE := $(wildcard javascript/*pre.js)
JS_POST := javascript/olm_outbound_group_session.js \
javascript/olm_inbound_group_session.js \
javascript/olm_pk.js \
javascript/olm_post.js
# The prefix & suffix are just added onto the start & end
# of what comes out emcc, so are outside of the modularised
# code and not seen by the opimiser.
JS_PREFIX := javascript/olm_prefix.js
JS_SUFFIX := javascript/olm_suffix.js
DOCS := tracing/README.html \
docs/megolm.html \
docs/olm.html \
@ -70,11 +84,23 @@ CFLAGS += -Wall -Werror -std=c99 -fPIC
CXXFLAGS += -Wall -Werror -std=c++11 -fPIC
LDFLAGS += -Wall -Werror
EMCCFLAGS = --closure 1 --memory-init-file 0 -s NO_FILESYSTEM=1 -s INVOKE_RUN=0
EMCCFLAGS = --closure 1 --memory-init-file 0 -s NO_FILESYSTEM=1 -s INVOKE_RUN=0 -s MODULARIZE=1
# NO_BROWSER is kept for compatibility with emscripten 1.35.24, but is no
# longer needed.
EMCCFLAGS += -s NO_BROWSER=1
# Olm generally doesn't need a lot of memory to encrypt / decrypt its usual
# payloads (ie. Matrix messages), but we do need about 128K of heap to encrypt
# a 64K event (enough to store the ciphertext and the plaintext, bearing in
# mind that the plaintext can only be 48K because base64). We also have about
# 36K of statics. So let's have 256K of memory.
# (This can't be changed by the app with wasm since it's baked into the wasm).
# (emscripten also mandates at least 16MB of memory for asm.js now, so
# we don't use this for the legacy build.)
EMCCFLAGS_WASM += -s TOTAL_STACK=65536 -s TOTAL_MEMORY=262144
EMCCFLAGS_ASMJS += -s WASM=0
EMCC.c = $(EMCC) $(CFLAGS) $(CPPFLAGS) -c
EMCC.cc = $(EMCC) $(CXXFLAGS) $(CPPFLAGS) -c
EMCC_LINK = $(EMCC) $(LDFLAGS) $(EMCCFLAGS)
@ -109,7 +135,8 @@ $(FUZZER_DEBUG_BINARIES): LDFLAGS += $(DEBUG_OPTIMIZE_FLAGS)
$(JS_OBJECTS): CFLAGS += $(JS_OPTIMIZE_FLAGS)
$(JS_OBJECTS): CXXFLAGS += $(JS_OPTIMIZE_FLAGS)
$(JS_TARGET): LDFLAGS += $(JS_OPTIMIZE_FLAGS)
$(JS_WASM_TARGET): LDFLAGS += $(JS_OPTIMIZE_FLAGS)
$(JS_ASMJS_TARGET): LDFLAGS += $(JS_OPTIMIZE_FLAGS)
### Fix to make mkdir work on windows and linux
ifeq ($(shell echo "check_quotes"),"check_quotes")
@ -150,15 +177,35 @@ static: $(STATIC_RELEASE_TARGET)
$(STATIC_RELEASE_TARGET): $(RELEASE_OBJECTS)
$(AR) rcs $@ $^
js: $(JS_TARGET)
js: $(JS_WASM_TARGET) $(JS_ASMJS_TARGET)
.PHONY: js
$(JS_TARGET): $(JS_OBJECTS) $(JS_PRE) $(JS_POST) $(JS_EXPORTED_FUNCTIONS)
$(EMCC_LINK) \
# Note that the output file we give to emcc determines the name of the
# wasm file baked into the js, hence messing around outputting to olm.js
# and then renaming it.
$(JS_WASM_TARGET): $(JS_OBJECTS) $(JS_PRE) $(JS_POST) $(JS_EXPORTED_FUNCTIONS) $(JS_PREFIX) $(JS_SUFFIX)
EMCC_CLOSURE_ARGS="--externs $(JS_EXTERNS)" $(EMCC_LINK) \
$(EMCCFLAGS_WASM) \
$(foreach f,$(JS_PRE),--pre-js $(f)) \
$(foreach f,$(JS_POST),--post-js $(f)) \
-s "EXPORTED_FUNCTIONS=@$(JS_EXPORTED_FUNCTIONS)" \
-s "EXTRA_EXPORTED_RUNTIME_METHODS=$(JS_EXTRA_EXPORTED_RUNTIME_METHODS)" \
$(JS_OBJECTS) -o $@
mv $@ javascript/olmtmp.js
cat $(JS_PREFIX) javascript/olmtmp.js $(JS_SUFFIX) > $@
rm javascript/olmtmp.js
$(JS_ASMJS_TARGET): $(JS_OBJECTS) $(JS_PRE) $(JS_POST) $(JS_EXPORTED_FUNCTIONS) $(JS_PREFIX) $(JS_SUFFIX)
EMCC_CLOSURE_ARGS="--externs $(JS_EXTERNS)" $(EMCC_LINK) \
$(EMCCFLAGS_ASMJS) \
$(foreach f,$(JS_PRE),--pre-js $(f)) \
$(foreach f,$(JS_POST),--post-js $(f)) \
-s "EXPORTED_FUNCTIONS=@$(JS_EXPORTED_FUNCTIONS)" \
-s "EXTRA_EXPORTED_RUNTIME_METHODS=$(JS_EXTRA_EXPORTED_RUNTIME_METHODS)" \
$(JS_OBJECTS) -o $@
mv $@ javascript/olmtmp.js
cat $(JS_PREFIX) javascript/olmtmp.js $(JS_SUFFIX) > $@
rm javascript/olmtmp.js
build_tests: $(TEST_BINARIES)

3
README.rst
View file

@ -31,6 +31,9 @@ To build the javascript bindings, install emscripten from http://kripken.github.
make js
Note that if you run emscripten in a docker container, you need to pass through
the EMCC_CLOSURE_ARGS environment variable.
To build the android project for Android bindings, run:
.. code:: bash

1
javascript/.gitignore vendored
View file

@ -2,4 +2,5 @@
/node_modules
/npm-debug.log
/olm.js
/olm.wasm
/reports

4
javascript/externs.js Normal file
View file

@ -0,0 +1,4 @@
var OLM_OPTIONS;
var olm_exports;
var onInitSuccess;
var onInitFail;

14
javascript/olm_inbound_group_session.js
View file

@ -1,9 +1,3 @@
/* The 'length' argument to Pointer_stringify doesn't work if the input includes
* characters >= 128; we therefore need to add a NULL character to all of our
* strings. This acts as a symbolic constant to help show what we're doing.
*/
var NULL_BYTE_PADDING_LENGTH = 1;
function InboundGroupSession() {
var size = Module['_olm_inbound_group_session_size']();
this.buf = malloc(size);
@ -77,14 +71,14 @@ InboundGroupSession.prototype['decrypt'] = restore_stack(function(
try {
message_buffer = malloc(message.length);
Module['writeAsciiToMemory'](message, message_buffer, true);
writeAsciiToMemory(message, message_buffer, true);
var max_plaintext_length = inbound_group_session_method(
Module['_olm_group_decrypt_max_plaintext_length']
)(this.ptr, message_buffer, message.length);
// caculating the length destroys the input buffer, so we need to re-copy it.
Module['writeAsciiToMemory'](message, message_buffer, true);
writeAsciiToMemory(message, message_buffer, true);
plaintext_buffer = malloc(max_plaintext_length + NULL_BYTE_PADDING_LENGTH);
var message_index = stack(4);
@ -100,14 +94,14 @@ InboundGroupSession.prototype['decrypt'] = restore_stack(function(
// UTF8ToString requires a null-terminated argument, so add the
// null terminator.
Module['setValue'](
setValue(
plaintext_buffer+plaintext_length,
0, "i8"
);
return {
"plaintext": UTF8ToString(plaintext_buffer),
"message_index": Module['getValue'](message_index, "i32")
"message_index": getValue(message_index, "i32")
}
} finally {
if (message_buffer !== undefined) {

15
javascript/olm_outbound_group_session.js
View file

@ -1,10 +1,3 @@
/* The 'length' argument to Pointer_stringify doesn't work if the input includes
* characters >= 128; we therefore need to add a NULL character to all of our
* strings. This acts as a symbolic constant to help show what we're doing.
*/
var NULL_BYTE_PADDING_LENGTH = 1;
function OutboundGroupSession() {
var size = Module['_olm_outbound_group_session_size']();
this.buf = malloc(size);
@ -66,7 +59,7 @@ OutboundGroupSession.prototype['create'] = restore_stack(function() {
OutboundGroupSession.prototype['encrypt'] = function(plaintext) {
var plaintext_buffer, message_buffer, plaintext_length;
try {
plaintext_length = Module['lengthBytesUTF8'](plaintext);
plaintext_length = lengthBytesUTF8(plaintext);
var message_length = outbound_group_session_method(
Module['_olm_group_encrypt_message_length']
@ -75,7 +68,7 @@ OutboundGroupSession.prototype['encrypt'] = function(plaintext) {
// need to allow space for the terminator (which stringToUTF8 always
// writes), hence + 1.
plaintext_buffer = malloc(plaintext_length + 1);
Module['stringToUTF8'](plaintext, plaintext_buffer, plaintext_length + 1);
stringToUTF8(plaintext, plaintext_buffer, plaintext_length + 1);
message_buffer = malloc(message_length + NULL_BYTE_PADDING_LENGTH);
outbound_group_session_method(Module['_olm_group_encrypt'])(
@ -86,12 +79,12 @@ OutboundGroupSession.prototype['encrypt'] = function(plaintext) {
// UTF8ToString requires a null-terminated argument, so add the
// null terminator.
Module['setValue'](
setValue(
message_buffer+message_length,
0, "i8"
);
return Module['UTF8ToString'](message_buffer);
return UTF8ToString(message_buffer);
} finally {
if (plaintext_buffer !== undefined) {
// don't leave a copy of the plaintext in the heap.

20
javascript/olm_pk.js
View file

@ -35,9 +35,9 @@ PkEncryption.prototype['encrypt'] = restore_stack(function(
) {
var plaintext_buffer, ciphertext_buffer, plaintext_length;
try {
plaintext_length = Module['lengthBytesUTF8'](plaintext)
plaintext_length = lengthBytesUTF8(plaintext)
plaintext_buffer = malloc(plaintext_length + 1);
Module['stringToUTF8'](plaintext, plaintext_buffer, plaintext_length + 1);
stringToUTF8(plaintext, plaintext_buffer, plaintext_length + 1);
var random_length = pk_encryption_method(
Module['_olm_pk_encrypt_random_length']
)();
@ -50,7 +50,7 @@ PkEncryption.prototype['encrypt'] = restore_stack(function(
Module['_olm_pk_mac_length']
)(this.ptr);
var mac_buffer = stack(mac_length + NULL_BYTE_PADDING_LENGTH);
Module['setValue'](
setValue(
mac_buffer + mac_length,
0, "i8"
);
@ -58,7 +58,7 @@ PkEncryption.prototype['encrypt'] = restore_stack(function(
Module['_olm_pk_key_length']
)();
var ephemeral_buffer = stack(ephemeral_length + NULL_BYTE_PADDING_LENGTH);
Module['setValue'](
setValue(
ephemeral_buffer + ephemeral_length,
0, "i8"
);
@ -72,12 +72,12 @@ PkEncryption.prototype['encrypt'] = restore_stack(function(
);
// UTF8ToString requires a null-terminated argument, so add the
// null terminator.
Module['setValue'](
setValue(
ciphertext_buffer + ciphertext_length,
0, "i8"
);
return {
"ciphertext": Module['UTF8ToString'](ciphertext_buffer),
"ciphertext": UTF8ToString(ciphertext_buffer),
"mac": Pointer_stringify(mac_buffer),
"ephemeral": Pointer_stringify(ephemeral_buffer)
};
@ -169,9 +169,9 @@ PkDecryption.prototype['decrypt'] = restore_stack(function (
) {
var plaintext_buffer, ciphertext_buffer, plaintext_max_length;
try {
ciphertext_length = Module['lengthBytesUTF8'](ciphertext)
var ciphertext_length = lengthBytesUTF8(ciphertext)
ciphertext_buffer = malloc(ciphertext_length + 1);
Module['stringToUTF8'](ciphertext, ciphertext_buffer, ciphertext_length + 1);
stringToUTF8(ciphertext, ciphertext_buffer, ciphertext_length + 1);
var ephemeralkey_array = array_from_string(ephemeral_key);
var ephemeralkey_buffer = stack(ephemeralkey_array);
var mac_array = array_from_string(mac);
@ -190,11 +190,11 @@ PkDecryption.prototype['decrypt'] = restore_stack(function (
);
// UTF8ToString requires a null-terminated argument, so add the
// null terminator.
Module['setValue'](
setValue(
plaintext_buffer + plaintext_length,
0, "i8"
);
return Module['UTF8ToString'](plaintext_buffer);
return UTF8ToString(plaintext_buffer);
} finally {
if (plaintext_buffer !== undefined) {
// don't leave a copy of the plaintext in the heap.

53
javascript/olm_post.js
View file

@ -1,27 +1,17 @@
var runtime = Module['Runtime'];
var malloc = Module['_malloc'];
var free = Module['_free'];
var Pointer_stringify = Module['Pointer_stringify'];
var OLM_ERROR = Module['_olm_error']();
/* The 'length' argument to Pointer_stringify doesn't work if the input
* includes characters >= 128, which makes Pointer_stringify unreliable. We
* could use it on strings which are known to be ascii, but that seems
* dangerous. Instead we add a NULL character to all of our strings and just
* use UTF8ToString.
*/
var NULL_BYTE_PADDING_LENGTH = 1;
var OLM_ERROR;
/* allocate a number of bytes of storage on the stack.
*
* If size_or_array is a Number, allocates that number of zero-initialised bytes.
*/
function stack(size_or_array) {
return Module['allocate'](size_or_array, 'i8', Module['ALLOC_STACK']);
return allocate(size_or_array, 'i8', Module['ALLOC_STACK']);
}
function array_from_string(string) {
return Module['intArrayFromString'](string, true);
return intArrayFromString(string, true);
}
function random_stack(size) {
@ -33,11 +23,11 @@ function random_stack(size) {
function restore_stack(wrapped) {
return function() {
var sp = runtime.stackSave();
var sp = stackSave();
try {
return wrapped.apply(this, arguments);
} finally {
runtime.stackRestore(sp);
stackRestore(sp);
}
}
}
@ -315,7 +305,7 @@ Session.prototype['encrypt'] = restore_stack(function(
Module['_olm_encrypt_message_type']
)(this.ptr);
plaintext_length = Module['lengthBytesUTF8'](plaintext);
plaintext_length = lengthBytesUTF8(plaintext);
var message_length = session_method(
Module['_olm_encrypt_message_length']
)(this.ptr, plaintext_length);
@ -325,7 +315,7 @@ Session.prototype['encrypt'] = restore_stack(function(
// need to allow space for the terminator (which stringToUTF8 always
// writes), hence + 1.
plaintext_buffer = malloc(plaintext_length + 1);
Module['stringToUTF8'](plaintext, plaintext_buffer, plaintext_length + 1);
stringToUTF8(plaintext, plaintext_buffer, plaintext_length + 1);
message_buffer = malloc(message_length + NULL_BYTE_PADDING_LENGTH);
@ -338,14 +328,14 @@ Session.prototype['encrypt'] = restore_stack(function(
// UTF8ToString requires a null-terminated argument, so add the
// null terminator.
Module['setValue'](
setValue(
message_buffer+message_length,
0, "i8"
);
return {
"type": message_type,
"body": Module['UTF8ToString'](message_buffer),
"body": UTF8ToString(message_buffer),
};
} finally {
if (plaintext_buffer !== undefined) {
@ -366,14 +356,14 @@ Session.prototype['decrypt'] = restore_stack(function(
try {
message_buffer = malloc(message.length);
Module['writeAsciiToMemory'](message, message_buffer, true);
writeAsciiToMemory(message, message_buffer, true);
max_plaintext_length = session_method(
Module['_olm_decrypt_max_plaintext_length']
)(this.ptr, message_type, message_buffer, message.length);
// caculating the length destroys the input buffer, so we need to re-copy it.
Module['writeAsciiToMemory'](message, message_buffer, true);
writeAsciiToMemory(message, message_buffer, true);
plaintext_buffer = malloc(max_plaintext_length + NULL_BYTE_PADDING_LENGTH);
@ -385,7 +375,7 @@ Session.prototype['decrypt'] = restore_stack(function(
// UTF8ToString requires a null-terminated argument, so add the
// null terminator.
Module['setValue'](
setValue(
plaintext_buffer+plaintext_length,
0, "i8"
);
@ -473,22 +463,3 @@ olm_exports["get_library_version"] = restore_stack(function() {
getValue(buf+2, 'i8'),
];
});
})();
// export the olm functions into the environment.
//
// make sure that we do this *after* populating olm_exports, so that we don't
// get a half-built window.Olm if there is an exception.
if (typeof module !== 'undefined' && module.exports) {
// node / browserify
module.exports = olm_exports;
}
if (typeof(window) !== 'undefined') {
// We've been imported directly into a browser. Define the global 'Olm' object.
// (we do this even if module.exports was defined, because it's useful to have
// Olm in the global scope for browserified and webpacked apps.)
window["Olm"] = olm_exports;
}

37
javascript/olm_pre.js
View file

@ -1,10 +1,7 @@
var olm_exports = {};
var get_random_values;
var process; // Shadow the process object so that emscripten won't get
// confused by browserify
if (typeof(window) !== 'undefined') {
// We've in a browser (directly, via browserify, or via webpack).
// We're in a browser (directly, via browserify, or via webpack).
get_random_values = function(buf) {
window.crypto.getRandomValues(buf);
};
@ -12,7 +9,9 @@ if (typeof(window) !== 'undefined') {
// We're running in node.
var nodeCrypto = require("crypto");
get_random_values = function(buf) {
var bytes = nodeCrypto.randomBytes(buf.length);
// [''] syntax needed here rather than '.' to prevent
// closure compiler from mangling the import(!)
var bytes = nodeCrypto['randomBytes'](buf.length);
buf.set(bytes);
};
process = global["process"];
@ -20,14 +19,30 @@ if (typeof(window) !== 'undefined') {
throw new Error("Cannot find global to attach library to");
}
(function() {
/* applications should define OLM_OPTIONS in the environment to override
* emscripten module settings */
var Module = {};
* emscripten module settings
*/
if (typeof(OLM_OPTIONS) !== 'undefined') {
for (var key in OLM_OPTIONS) {
if (OLM_OPTIONS.hasOwnProperty(key)) {
Module[key] = OLM_OPTIONS[key];
for (var olm_option_key in OLM_OPTIONS) {
if (OLM_OPTIONS.hasOwnProperty(olm_option_key)) {
Module[olm_option_key] = OLM_OPTIONS[olm_option_key];
}
}
}
/* The 'length' argument to Pointer_stringify doesn't work if the input
* includes characters >= 128, which makes Pointer_stringify unreliable. We
* could use it on strings which are known to be ascii, but that seems
* dangerous. Instead we add a NULL character to all of our strings and just
* use UTF8ToString.
*/
var NULL_BYTE_PADDING_LENGTH = 1;
Module['onRuntimeInitialized'] = function() {
OLM_ERROR = Module['_olm_error']();
if (onInitSuccess) onInitSuccess();
};
Module['onAbort'] = function(err) {
if (onInitFail) onInitFail(err);
};

3
javascript/olm_prefix.js Normal file
View file

@ -0,0 +1,3 @@
var olm_exports = {};
var onInitSuccess;
var onInitFail;

32
javascript/olm_suffix.js Normal file
View file

@ -0,0 +1,32 @@
var olmInitPromise;
olm_exports['init'] = function(opts) {
if (olmInitPromise) return olmInitPromise;
if (opts) OLM_OPTIONS = opts;
olmInitPromise = new Promise(function(resolve, reject) {
onInitSuccess = function() {
resolve();
};
onInitFail = function(err) {
reject(err);
};
Module();
});
return olmInitPromise;
};
if (typeof(window) !== 'undefined') {
// We've been imported directly into a browser. Define the global 'Olm' object.
// (we do this even if module.exports was defined, because it's useful to have
// Olm in the global scope for browserified and webpacked apps.)
window["Olm"] = olm_exports;
}
if (typeof module === 'object') {
// Emscripten sets the module exports to be its module
// with wrapped c functions. Clobber it with our higher
// level wrapper class.
module.exports = olm_exports;
}

1
javascript/package.json
View file

@ -5,6 +5,7 @@
"main": "olm.js",
"files": [
"olm.js",
"olm.wasm",
"README.md"
],
"scripts": {

7
javascript/test/megolm.spec.js
View file

@ -1,5 +1,6 @@
/*
Copyright 2016 OpenMarket Ltd
Copyright 2018 New Vector Ltd
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
@ -21,9 +22,13 @@ var Olm = require('../olm');
describe("megolm", function() {
var aliceSession, bobSession;
beforeEach(function() {
beforeEach(function(done) {
Olm.init().then(function() {
aliceSession = new Olm.OutboundGroupSession();
bobSession = new Olm.InboundGroupSession();
done();
});
});
afterEach(function() {

10
javascript/test/olm.spec.js
View file

@ -1,5 +1,6 @@
/*
Copyright 2016 OpenMarket Ltd
Copyright 2018 New Vector Ltd
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
@ -30,11 +31,18 @@ describe("olm", function() {
var aliceAccount, bobAccount;
var aliceSession, bobSession;
beforeEach(function() {
beforeEach(function(done) {
// This should really be in a beforeAll, but jasmine-node
// doesn't support that
debugger;
Olm.init().then(function() {
aliceAccount = new Olm.Account();
bobAccount = new Olm.Account();
aliceSession = new Olm.Session();
bobSession = new Olm.Session();
done();
});
});
afterEach(function() {

6
javascript/test/pk.spec.js
View file

@ -21,9 +21,13 @@ var Olm = require('../olm');
describe("pk", function() {
var encryption, decryption;
beforeEach(function() {
beforeEach(function(done) {
Olm.init().then(function() {
encryption = new Olm.PkEncryption();
decryption = new Olm.PkDecryption();
done();
});
});
afterEach(function () {