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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(info, length) {
var info_array = array_from_string(info);
var info_buffer = stack(info_array);
var output_buffer = stack(length);
sas_method(Module['_olm_sas_generate_bytes'])(
this.ptr,
info_buffer, info_array.length,
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, info) {
var input_array = array_from_string(input);
var input_buffer = stack(input_array);
var info_array = array_from_string(info);
var info_buffer = stack(info_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,
info_buffer, info_array.length,
mac_buffer, mac_length
);
return Pointer_stringify(mac_buffer);
});
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