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-rw-r--r--javascript/olm_post.js1
-rw-r--r--javascript/olm_sas.js71
-rw-r--r--javascript/test/sas.spec.js53
3 files changed, 125 insertions, 0 deletions
diff --git a/javascript/olm_post.js b/javascript/olm_post.js
index 8c06fff..3bf0d66 100644
--- a/javascript/olm_post.js
+++ b/javascript/olm_post.js
@@ -534,6 +534,7 @@ olm_exports["Session"] = Session;
olm_exports["Utility"] = Utility;
olm_exports["PkEncryption"] = PkEncryption;
olm_exports["PkDecryption"] = PkDecryption;
+olm_exports["SAS"] = SAS;
olm_exports["get_library_version"] = restore_stack(function() {
var buf = stack(3);
diff --git a/javascript/olm_sas.js b/javascript/olm_sas.js
new file mode 100644
index 0000000..8fc535b
--- /dev/null
+++ b/javascript/olm_sas.js
@@ -0,0 +1,71 @@
+function SAS() {
+ var size = Module['_olm_sas_size']();
+ var random_length = Module['_olm_create_sas_random_length']();
+ var random = random_stack(random_length);
+ this.buf = malloc(size);
+ this.ptr = Module['_olm_sas'](this.buf);
+ Module['_olm_create_sas'](this.ptr, random, random_length);
+ bzero(random, random_length);
+}
+
+function sas_method(wrapped) {
+ return function() {
+ var result = wrapped.apply(this, arguments);
+ if (result === OLM_ERROR) {
+ var message = Pointer_stringify(
+ Module['_olm_sas_last_error'](arguments[0])
+ );
+ throw new Error("OLM." + message);
+ }
+ return result;
+ }
+}
+
+SAS.prototype['free'] = function() {
+ Module['_olm_clear_sas'](this.ptr);
+ free(this.ptr);
+};
+
+SAS.prototype['get_pubkey'] = restore_stack(function() {
+ var pubkey_length = sas_method(Module['_olm_sas_pubkey_length'])(this.ptr);
+ var pubkey_buffer = stack(pubkey_length + NULL_BYTE_PADDING_LENGTH);
+ sas_method(Module['_olm_sas_get_pubkey'])(this.ptr, pubkey_buffer, pubkey_length);
+ return Pointer_stringify(pubkey_buffer);
+});
+
+SAS.prototype['set_their_key'] = restore_stack(function(their_key) {
+ var their_key_array = array_from_string(their_key);
+ var their_key_buffer = stack(their_key_array);
+ sas_method(Module['_olm_sas_set_their_key'])(
+ this.ptr,
+ their_key_buffer, their_key_array.length
+ );
+});
+
+SAS.prototype['generate_bytes'] = restore_stack(function(length) {
+ var output_buffer = stack(length);
+ sas_method(Module['_olm_sas_generate_bytes'])(
+ this.ptr,
+ output_buffer, length
+ );
+ // The inner Uint8Array creates a view of the buffer. The outer Uint8Array
+ // copies it to a new array to return, since the original buffer will get
+ // deallocated from the stack and could get overwritten.
+ var output_arr = new Uint8Array(
+ new Uint8Array(Module['HEAPU8'].buffer, output_buffer, length)
+ );
+ return output_arr;
+});
+
+SAS.prototype['calculate_mac'] = restore_stack(function(input) {
+ var input_array = array_from_string(input);
+ var input_buffer = stack(input_array)
+ var mac_length = sas_method(Module['_olm_sas_mac_length'])(this.ptr);
+ var mac_buffer = stack(mac_length + NULL_BYTE_PADDING_LENGTH);
+ sas_method(Module['_olm_sas_calculate_mac'])(
+ this.ptr,
+ input_buffer, input_array.length,
+ mac_buffer, mac_length
+ );
+ return Pointer_stringify(mac_buffer);
+});
diff --git a/javascript/test/sas.spec.js b/javascript/test/sas.spec.js
new file mode 100644
index 0000000..544131d
--- /dev/null
+++ b/javascript/test/sas.spec.js
@@ -0,0 +1,53 @@
+/*
+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.
+You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+var Olm = require('../olm');
+
+describe("sas", function() {
+ var alice, bob;
+
+ beforeEach(async function(done) {
+ Olm.init().then(function() {
+ alice = new Olm.SAS();
+ bob = new Olm.SAS();
+
+ done();
+ });
+ });
+
+ afterEach(function () {
+ if (alice !== undefined) {
+ alice.free();
+ alice = undefined;
+ }
+ if (bob !== undefined) {
+ bob.free();
+ bob = undefined;
+ }
+ });
+
+ it('should create matching SAS bytes', function () {
+ alice.set_their_key(bob.get_pubkey());
+ bob.set_their_key(alice.get_pubkey());
+ expect(alice.generate_bytes(5).toString()).toEqual(bob.generate_bytes(5).toString());
+ });
+
+ it('should create matching MACs', function () {
+ alice.set_their_key(bob.get_pubkey());
+ bob.set_their_key(alice.get_pubkey());
+ expect(alice.calculate_mac("test").toString()).toEqual(bob.calculate_mac("test").toString());
+ });
+});