Add javascript bindings using emscripten
This commit is contained in:
Mark Haines
parent
f10c04d62d
commit
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3 changed files with 317 additions and 0 deletions
247
javascript/axolotl_post.js
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247
javascript/axolotl_post.js
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var runtime = Module['Runtime'];
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var malloc = Module['_malloc'];
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var free = Module['_free'];
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var Pointer_stringify = Module['Pointer_stringify'];
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var AXOLOTL_ERROR = Module['_axolotl_error']();
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function stack(size_or_array) {
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return Module['allocate'](size_or_array, 'i8', Module['ALLOC_STACK']);
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}
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function array_from_string(string) {
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return Module['intArrayFromString'](string, true);
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}
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function random_stack(size) {
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var ptr = stack(size);
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var array = new Uint8Array(Module['HEAPU8'].buffer, ptr, size);
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window.crypto.getRandomValues(array);
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}
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function restore_stack(wrapped) {
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return function() {
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var sp = runtime.stackSave();
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try {
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return wrapped.apply(this, arguments);
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} finally {
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runtime.stackRestore(sp);
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}
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}
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}
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function Account() {
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var size = Module['_axolotl_account_size']();
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this.buf = malloc(size);
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this.ptr = Module['_axolotl_account'](this.buf);
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}
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function account_method(wrapped) {
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return function() {
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var result = wrapped.apply(this, arguments);
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if (result === AXOLOTL_ERROR) {
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var message = Pointer_stringify(
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Module['_axolotl_account_last_error'](arguments[0])
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);
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throw "AXOLOTL." + message;
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}
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return result;
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}
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}
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Account.prototype['free'] = function() {
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free(this.ptr);
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}
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Account.prototype['create'] = restore_stack(function() {
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var random_length = account_method(
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Module['_axolotl_create_account_random_length']
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)(this.ptr);
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var random = random_stack(random_length);
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account_method(Module['_axolotl_create_account'])(
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this.ptr, random, random_length
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);
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});
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Account.prototype['identity_keys'] = restore_stack(function() {
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var keys_length = account_method(
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Module['_axolotl_account_identity_keys_length']
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)(this.ptr);
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var keys = stack(keys_length);
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account_method(Module['_axolotl_account_identity_keys'])(
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this.ptr, keys, keys_length
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);
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return Pointer_stringify(keys, keys_length);
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});
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Account.prototype['one_time_keys'] = restore_stack(function() {
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var keys_length = account_method(
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Module['_axolotl_account_one_time_keys_length']
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)(this.ptr);
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var keys = stack(keys_length);
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account_method(Module['_axolotl_account_one_time_keys'])(
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this.ptr, keys, keys_length
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);
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return Pointer_stringify(keys, keys_length);
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});
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Account.prototype['pickle'] = restore_stack(function(key) {
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var key_array = array_from_string(key);
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var pickle_length = account_method(
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Module['_axolotl_pickle_account_length']
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)(this.ptr);
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var key_buffer = stack(key_array);
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var pickle_buffer = stack(pickle_length);
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account_method(Module['_axolotl_pickle_account'])(
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this.ptr, key_buffer, key_array.length, pickle_buffer, pickle_length
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);
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return Pointer_stringify(pickle_buffer, pickle_length);
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});
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Account.prototype['unpickle'] = restore_stack(function(key, pickle) {
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var key_array = array_from_string(key);
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var key_buffer = stack(key_array);
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var pickle_array = array_from_string(pickle);
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var pickle_buffer = stack(pickle_length);
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account_method(Module['_axolotl_unpickle_account'])(
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this.ptr, key_buffer, key_array.length, pickle_buffer,
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pickle_array.length
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);
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});
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function Session() {
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var size = Module['_axolotl_session_size']();
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this.buf = malloc(size);
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this.ptr = Module['_axolotl_session'](this.buf);
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}
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function session_method(wrapped) {
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return function() {
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var result = wrapped.apply(this, arguments);
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if (result === AXOLOTL_ERROR) {
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var message = Pointer_stringify(
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Module['_axolotl_session_last_error'](arguments[0])
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);
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throw "AXOLOTL." + message;
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}
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return result;
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}
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}
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Session.prototype['free'] = function() {
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free(this.ptr);
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}
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Session.prototype['pickle'] = restore_stack(function(key) {
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var key_array = array_from_string(key);
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var pickle_length = session_method(
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Module['_axolotl_pickle_session_length']
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)(this.ptr);
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var key_buffer = stack(key_array);
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var pickle_buffer = stack(pickle_length);
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session_method(Module['_axolotl_pickle_session'])(
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this.ptr, key_buffer, key_array.length, pickle_buffer, pickle_length
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);
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return Pointer_stringify(pickle_buffer, pickle_length);
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});
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Session.prototype['unpickle'] = restore_stack(function(key, pickle) {
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var key_array = array_from_string(key);
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var key_buffer = stack(key_array);
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var pickle_array = array_from_string(pickle);
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var pickle_buffer = stack(pickle_array);
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session_method(Module['_axolotl_unpickle_session'])(
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this.ptr, key_buffer, key_array.length, pickle_buffer,
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pickle_array.length
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);
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});
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Session.prototype['create_outbound'] = restore_stack(function(
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account, their_identity_key, their_one_time_key_id, their_one_time_key
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) {
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var random_length = session_method(
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Module['_axolotl_create_outbound_session_random_length']
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)(this.ptr);
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var random = random_stack(random_length);
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var identity_key_array = array_from_string(their_identity_key);
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var one_time_key_array = array_from_string(their_one_time_key);
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var identity_key_buffer = stack(identity_key_array);
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var one_time_key_buffer = stack(one_time_key_array);
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session_method(Module['_axolotl_create_outbound_session'])(
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this.ptr, account.ptr,
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identity_key_buffer, identity_key_array.length,
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their_one_time_key_id,
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one_time_key_buffer, one_time_key_array.length,
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random, random_length
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);
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});
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Session.prototype['create_inbound'] = restore_stack(function(
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account, one_time_key_message
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) {
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var message_array = array_from_string(one_time_key_message);
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var message_buffer = stack(message_array);
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session_method(Module['_axolotl_create_inbound_session'])(
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this.ptr, account.ptr, message_buffer, message_array.length
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);
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});
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Session.prototype['matches_inbound'] = restore_stack(function(
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account, one_time_key_message
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) {
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var message_array = array_from_string(one_time_key_message);
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var message_buffer = stack(message_array);
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return session_method(Module['_axolotl_matches_inbound_session'])(
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this.ptr, account.ptr, message_buffer, message_array.length
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) ? true : false;
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});
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Session.prototype['encrypt'] = restore_stack(function(
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plaintext
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) {
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var random_length = session_method(
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Module['_axolotl_encrypt_random_length']
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)(this.ptr);
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var message_type = session_method(
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Module['_axolotl_encrypt_message_type']
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)(this.ptr);
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var plaintext_array = array_from_string(plaintext);
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var message_length = session_method(
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Module['_axolotl_encrypt_message_length']
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)(this.ptr, plaintext_array.length);
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var random = random_stack(random_length);
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var plaintext_buffer = stack(plaintext_array);
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var message_buffer = stack(message_length);
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session_method(Module['_axolotl_encrypt'])(
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this.ptr,
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plaintext_buffer, plaintext_array.length,
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random, random_length,
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message_buffer, message_length
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);
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return {
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"type": message_type,
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"body": Pointer_stringify(message_buffer, message_length)
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};
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});
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Session.prototype['decrypt'] = restore_stack(function(
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message_type, message
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) {
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var message_array = array_from_string(message);
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var message_buffer = stack(message_array);
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var max_plaintext_length = session_method(
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Module['_axolotl_decrypt_max_plaintext_length']
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)(this.ptr, message_type, message_buffer, message_array.length);
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// caculating the length destroys the input buffer.
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// So we copy the array to a new buffer
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var message_buffer = stack(message_array);
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var plaintext_buffer = stack(max_plaintext_length);
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var plaintext_length = session_method(Module["_axolotl_decrypt"])(
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this.ptr, message_type,
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message_buffer, message.length,
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plaintext_buffer, max_plaintext_length
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);
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return Pointer_stringify(plaintext_buffer, plaintext_length);
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});
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return {"Account": Account, "Session": Session};
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}();
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1
javascript/axolotl_pre.js
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1
javascript/axolotl_pre.js
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Axolotl = function() {
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69
javascript/build.py
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69
javascript/build.py
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#! /usr/bin/python
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# Copyright 2015 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import subprocess
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import glob
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import os
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import sys
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import re
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import json
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source_files = glob.glob("src/*.cpp")
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pre_js, = glob.glob("javascript/*pre.js")
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post_js, = glob.glob("javascript/*post.js")
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functions = set()
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RE_FUNCTION=re.compile("(axolotl_[^( ]*)\\(")
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with open("include/axolotl/axolotl.hh") as header:
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for line in header:
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match = RE_FUNCTION.search(line)
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if match:
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functions.add(match.groups()[0])
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exported_functions = os.path.abspath("build/exported_functions.json")
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with open(exported_functions, "w") as json_file:
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json.dump(["_" + function for function in functions], json_file)
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emcc = os.environ.get("EMCC", "emcc")
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compile_args = [emcc]
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compile_args += """
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-O3
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-Iinclude
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-Ilib
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-std=c++11
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--closure 1
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--memory-init-file 0
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-s NO_FILESYSTEM=1
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-s NO_BROWSER=1
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-s INVOKE_RUN=0
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""".split()
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compile_args += source_files
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compile_args += ("--pre-js", pre_js)
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compile_args += ("--post-js", post_js)
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compile_args += ("-s", "EXPORTED_FUNCTIONS=@" + exported_functions)
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library = "build/axolotl.js"
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def run(args):
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print args
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print " ".join(args)
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subprocess.check_call(args)
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run(compile_args + ["-o", library])
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