mirror of https://git.matrix.org/git/olm.git
109 lines
3.9 KiB
JavaScript
109 lines
3.9 KiB
JavaScript
/* The 'length' argument to Pointer_stringify doesn't work if the input includes
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* characters >= 128; we therefore need to add a NULL character to all of our
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* strings. This acts as a symbolic constant to help show what we're doing.
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*/
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var NULL_BYTE_PADDING_LENGTH = 1;
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function InboundGroupSession() {
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var size = Module['_olm_inbound_group_session_size']();
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this.buf = malloc(size);
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this.ptr = Module['_olm_inbound_group_session'](this.buf);
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}
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function inbound_group_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 === OLM_ERROR) {
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var message = Pointer_stringify(
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Module['_olm_inbound_group_session_last_error'](arguments[0])
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);
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throw new Error("OLM." + message);
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}
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return result;
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}
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}
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InboundGroupSession.prototype['free'] = function() {
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Module['_olm_clear_inbound_group_session'](this.ptr);
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free(this.ptr);
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}
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InboundGroupSession.prototype['pickle'] = restore_stack(function(key) {
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var key_array = array_from_string(key);
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var pickle_length = inbound_group_session_method(
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Module['_olm_pickle_inbound_group_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 + NULL_BYTE_PADDING_LENGTH);
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inbound_group_session_method(Module['_olm_pickle_inbound_group_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);
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});
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InboundGroupSession.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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inbound_group_session_method(Module['_olm_unpickle_inbound_group_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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InboundGroupSession.prototype['create'] = restore_stack(function(session_key) {
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var key_array = array_from_string(session_key);
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var key_buffer = stack(key_array);
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inbound_group_session_method(Module['_olm_init_inbound_group_session'])(
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this.ptr, key_buffer, key_array.length
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);
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});
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InboundGroupSession.prototype['decrypt'] = restore_stack(function(
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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 = inbound_group_session_method(
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Module['_olm_group_decrypt_max_plaintext_length']
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)(this.ptr, 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 + NULL_BYTE_PADDING_LENGTH);
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var message_index = stack(4);
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var plaintext_length = inbound_group_session_method(Module["_olm_group_decrypt"])(
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this.ptr,
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message_buffer, message_array.length,
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plaintext_buffer, max_plaintext_length,
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message_index
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);
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// Pointer_stringify requires a null-terminated argument (the optional
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// 'len' argument doesn't work for UTF-8 data).
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Module['setValue'](
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plaintext_buffer+plaintext_length,
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0, "i8"
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);
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return {
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"plaintext": Pointer_stringify(plaintext_buffer),
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"message_index": Module['getValue'](message_index, "i32")
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}
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});
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InboundGroupSession.prototype['session_id'] = restore_stack(function() {
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var length = inbound_group_session_method(
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Module['_olm_inbound_group_session_id_length']
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)(this.ptr);
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var session_id = stack(length + NULL_BYTE_PADDING_LENGTH);
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inbound_group_session_method(Module['_olm_inbound_group_session_id'])(
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this.ptr, session_id, length
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);
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return Pointer_stringify(session_id);
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});
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olm_exports['InboundGroupSession'] = InboundGroupSession;
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