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authorHubert Chathi <hubert@uhoreg.ca>2018-12-27 18:16:56 -0500
committerHubert Chathi <hubert@uhoreg.ca>2018-12-27 18:16:56 -0500
commitded55f50536d852b544c7255551fc3b8c1e7b044 (patch)
tree9ec78736060fdebcf0eec7dfec6e8723af05caf1 /javascript/olm_sas.js
parentec2695b9c945fa577c6fc4501d65a186208ecfed (diff)
initial implementation of short authentication string generation
Diffstat (limited to 'javascript/olm_sas.js')
-rw-r--r--javascript/olm_sas.js71
1 files changed, 71 insertions, 0 deletions
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);
+});