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Javascript bindings for group sessions

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This commit is contained in:
Richard van der Hoff 2016-05-25 14:42:49 +01:00
parent ee8172d882
commit 013f27f3dc
4 changed files with 206 additions and 4 deletions
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11
Makefile
View file

@ -15,7 +15,7 @@ JS_TARGET := javascript/olm.js
JS_EXPORTED_FUNCTIONS := javascript/exported_functions.json
PUBLIC_HEADERS := include/olm/olm.h
PUBLIC_HEADERS := include/olm/olm.h include/olm/outbound_group_session.h include/olm/inbound_group_session.h
SOURCES := $(wildcard src/*.cpp) $(wildcard src/*.c) \
lib/crypto-algorithms/sha256.c \
@ -34,7 +34,9 @@ FUZZER_DEBUG_BINARIES := $(patsubst $(BUILD_DIR)/fuzzers/fuzz_%,$(BUILD_DIR)/fuz
TEST_BINARIES := $(patsubst tests/%,$(BUILD_DIR)/tests/%,$(basename $(TEST_SOURCES)))
JS_OBJECTS := $(addprefix $(BUILD_DIR)/javascript/,$(OBJECTS))
JS_PRE := $(wildcard javascript/*pre.js)
JS_POST := $(wildcard javascript/*post.js)
JS_POST := javascript/olm_outbound_group_session.js \
javascript/olm_inbound_group_session.js \
javascript/olm_post.js
CPPFLAGS += -Iinclude -Ilib
# we rely on <stdint.h>, which was introduced in C99
@ -106,7 +108,8 @@ js: $(JS_TARGET)
$(JS_TARGET): $(JS_OBJECTS) $(JS_PRE) $(JS_POST) $(JS_EXPORTED_FUNCTIONS)
$(EMCC_LINK) \
--pre-js $(JS_PRE) --post-js $(JS_POST) \
$(foreach f,$(JS_PRE),--pre-js $(f)) \
$(foreach f,$(JS_POST),--post-js $(f)) \
-s "EXPORTED_FUNCTIONS=@$(JS_EXPORTED_FUNCTIONS)" \
$(JS_OBJECTS) -o $@
@ -122,7 +125,7 @@ fuzzers: $(FUZZER_BINARIES) $(FUZZER_DEBUG_BINARIES)
.PHONY: fuzzers
$(JS_EXPORTED_FUNCTIONS): $(PUBLIC_HEADERS)
perl -MJSON -ne '/(olm_[^( ]*)\(/ && push @f, "_$$1"; END { print encode_json \@f }' $^ > $@.tmp
perl -MJSON -ne '$$f{"_$$1"}=1 if /(olm_[^( ]*)\(/; END { @f=sort keys %f; print encode_json \@f }' $^ > $@.tmp
mv $@.tmp $@
all: test js lib debug

17
javascript/README.md
View file

@ -23,3 +23,20 @@ Example:
bob_session.create_inbound(bob, bob_message);
var plaintext = bob_session.decrypt(message_1.type, bob_message);
bob.remove_one_time_keys(bob_session);
Group chat:
var outbound_session = new Olm.OutboundGroupSession();
outbound_session.create();
// exchange these over a secure channel
var session_id = group_session.session_id();
var session_key = group_session.session_key();
var message_index = group_session.message_index();
var inbound_session = new Olm.InboundGroupSession();
inbound_session.create(message_index, session_key);
var ciphertext = outbound_session.encrypt("Hello");
var plaintext = inbound_session.decrypt(ciphertext);

78
javascript/olm_inbound_group_session.js Normal file
View file

@ -0,0 +1,78 @@
function InboundGroupSession() {
var size = Module['_olm_inbound_group_session_size']();
this.buf = malloc(size);
this.ptr = Module['_olm_inbound_group_session'](this.buf);
}
function inbound_group_session_method(wrapped) {
return function() {
var result = wrapped.apply(this, arguments);
if (result === OLM_ERROR) {
var message = Pointer_stringify(
Module['_olm_inbound_group_session_last_error'](arguments[0])
);
throw new Error("OLM." + message);
}
return result;
}
}
InboundGroupSession.prototype['free'] = function() {
Module['_olm_clear_inbound_group_session'](this.ptr);
free(this.ptr);
}
InboundGroupSession.prototype['pickle'] = restore_stack(function(key) {
var key_array = array_from_string(key);
var pickle_length = inbound_group_session_method(
Module['_olm_pickle_inbound_group_session_length']
)(this.ptr);
var key_buffer = stack(key_array);
var pickle_buffer = stack(pickle_length);
inbound_group_session_method(Module['_olm_pickle_inbound_group_session'])(
this.ptr, key_buffer, key_array.length, pickle_buffer, pickle_length
);
return Pointer_stringify(pickle_buffer, pickle_length);
});
InboundGroupSession.prototype['unpickle'] = restore_stack(function(key, pickle) {
var key_array = array_from_string(key);
var key_buffer = stack(key_array);
var pickle_array = array_from_string(pickle);
var pickle_buffer = stack(pickle_array);
inbound_group_session_method(Module['_olm_unpickle_inbound_group_session'])(
this.ptr, key_buffer, key_array.length, pickle_buffer,
pickle_array.length
);
});
InboundGroupSession.prototype['create'] = restore_stack(function(message_index, session_key) {
var key_array = array_from_string(session_key);
var key_buffer = stack(key_array);
inbound_group_session_method(Module['_olm_init_inbound_group_session'])(
this.ptr, message_index, key_buffer, key_array.length
);
});
InboundGroupSession.prototype['decrypt'] = restore_stack(function(
message
) {
var message_array = array_from_string(message);
var message_buffer = stack(message_array);
var max_plaintext_length = session_method(
Module['_olm_group_decrypt_max_plaintext_length']
)(this.ptr, message_buffer, message_array.length);
// caculating the length destroys the input buffer.
// So we copy the array to a new buffer
var message_buffer = stack(message_array);
var plaintext_buffer = stack(max_plaintext_length);
var plaintext_length = session_method(Module["_olm_group_decrypt"])(
this.ptr,
message_buffer, message.length,
plaintext_buffer, max_plaintext_length
);
return Pointer_stringify(plaintext_buffer, plaintext_length);
});
olm_exports['InboundGroupSession'] = InboundGroupSession;

104
javascript/olm_outbound_group_session.js Normal file
View file

@ -0,0 +1,104 @@
function OutboundGroupSession() {
var size = Module['_olm_outbound_group_session_size']();
this.buf = malloc(size);
this.ptr = Module['_olm_outbound_group_session'](this.buf);
}
function outbound_group_session_method(wrapped) {
return function() {
var result = wrapped.apply(this, arguments);
if (result === OLM_ERROR) {
var message = Pointer_stringify(
Module['_olm_outbound_group_session_last_error'](arguments[0])
);
throw new Error("OLM." + message);
}
return result;
}
}
OutboundGroupSession.prototype['free'] = function() {
Module['_olm_clear_outbound_group_session'](this.ptr);
free(this.ptr);
}
OutboundGroupSession.prototype['pickle'] = restore_stack(function(key) {
var key_array = array_from_string(key);
var pickle_length = outbound_group_session_method(
Module['_olm_pickle_outbound_group_session_length']
)(this.ptr);
var key_buffer = stack(key_array);
var pickle_buffer = stack(pickle_length);
outbound_group_session_method(Module['_olm_pickle_outbound_group_session'])(
this.ptr, key_buffer, key_array.length, pickle_buffer, pickle_length
);
return Pointer_stringify(pickle_buffer, pickle_length);
});
OutboundGroupSession.prototype['unpickle'] = restore_stack(function(key, pickle) {
var key_array = array_from_string(key);
var key_buffer = stack(key_array);
var pickle_array = array_from_string(pickle);
var pickle_buffer = stack(pickle_array);
outbound_group_session_method(Module['_olm_unpickle_outbound_group_session'])(
this.ptr, key_buffer, key_array.length, pickle_buffer,
pickle_array.length
);
});
OutboundGroupSession.prototype['create'] = restore_stack(function(key) {
var random_length = session_method(
Module['_olm_init_outbound_group_session_random_length']
)(this.ptr);
var random = random_stack(random_length);
outbound_group_session_method(Module['_olm_init_outbound_group_session'])(
this.ptr, random, random_length
);
});
OutboundGroupSession.prototype['encrypt'] = restore_stack(function(plaintext) {
var plaintext_array = array_from_string(plaintext);
var message_length = outbound_group_session_method(
Module['_olm_group_encrypt_message_length']
)(this.ptr, plaintext_array.length);
var plaintext_buffer = stack(plaintext_array);
var message_buffer = stack(message_length);
outbound_group_session_method(Module['_olm_group_encrypt'])(
this.ptr,
plaintext_buffer, plaintext_array.length,
message_buffer, message_length
);
return Pointer_stringify(message_buffer, message_length);
});
OutboundGroupSession.prototype['session_id'] = restore_stack(function(key) {
var length = outbound_group_session_method(
Module['_olm_outbound_group_session_id_length']
)(this.ptr);
var session_id = stack(length);
outbound_group_session_method(Module['_olm_outbound_group_session_id'])(
this.ptr, session_id, length
);
return Pointer_stringify(session_id, length);
});
OutboundGroupSession.prototype['session_key'] = restore_stack(function(key) {
var key_length = outbound_group_session_method(
Module['_olm_outbound_group_session_key_length']
)(this.ptr);
var key = stack(key_length);
outbound_group_session_method(Module['_olm_outbound_group_session_key'])(
this.ptr, key, key_length
);
return Pointer_stringify(key, key_length);
});
OutboundGroupSession.prototype['message_index'] = function() {
var idx = outbound_group_session_method(
Module['_olm_outbound_group_session_message_index']
)(this.ptr);
return idx;
};
olm_exports['OutboundGroupSession'] = OutboundGroupSession;