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olm_post.js 18.65 KiB
var malloc = Module['_malloc'];
var free = Module['_free'];
var OLM_ERROR;
function filled_stack(size, filler) {
var ptr = stackAlloc(size);
filler(new Uint8Array(Module['HEAPU8'].buffer, ptr, size));
return ptr;
}
/* allocate a number of bytes of storage on the stack.
*
* If size_or_array is a Number, allocates that number of zero-initialised bytes.
*/
function stack(size_or_array) {
return (typeof size_or_array == 'number')
? filled_stack(size_or_array, function(x) { x.fill(0) })
: filled_stack(size_or_array.length, function(x) { x.set(size_or_array) });
}
function array_from_string(string) {
return string instanceof Uint8Array ? string : intArrayFromString(string, true);
}
function random_stack(size) {
return filled_stack(size, get_random_values);
}
function restore_stack(wrapped) {
return function() {
var sp = stackSave();
try {
return wrapped.apply(this, arguments);
} finally {
stackRestore(sp);
}
}
}
/* set a memory area to zero */
function bzero(ptr, n) {
while(n-- > 0) {
Module['HEAP8'][ptr++] = 0;
}
}
function Account() {
var size = Module['_olm_account_size']();
this.buf = malloc(size);
this.ptr = Module['_olm_account'](this.buf);
}
function account_method(wrapped) {
return function() {
var result = wrapped.apply(this, arguments);
if (result === OLM_ERROR) {
var message = UTF8ToString(
Module['_olm_account_last_error'](arguments[0])
);
throw new Error("OLM." + message);
}
return result;
}
}
Account.prototype['free'] = function() {
Module['_olm_clear_account'](this.ptr);
free(this.ptr);
}
Account.prototype['create'] = restore_stack(function() {
var random_length = account_method(
Module['_olm_create_account_random_length']
)(this.ptr);
var random = random_stack(random_length);
account_method(Module['_olm_create_account'])(
this.ptr, random, random_length
);
});
Account.prototype['identity_keys'] = restore_stack(function() {
var keys_length = account_method(
Module['_olm_account_identity_keys_length']
)(this.ptr);
var keys = stack(keys_length + NULL_BYTE_PADDING_LENGTH);
account_method(Module['_olm_account_identity_keys'])(
this.ptr, keys, keys_length
);
return UTF8ToString(keys, keys_length);
});
Account.prototype['sign'] = restore_stack(function(message) {
var signature_length = account_method(
Module['_olm_account_signature_length']
)(this.ptr);
var message_array = array_from_string(message);
var message_buffer = stack(message_array);
var signature_buffer = stack(signature_length + NULL_BYTE_PADDING_LENGTH);
try {
account_method(Module['_olm_account_sign'])(
this.ptr,
message_buffer, message_array.length,
signature_buffer, signature_length
);
} finally {
// clear out copies of the message, which may be plaintext
bzero(message_buffer, message_array.length);
for (var i = 0; i < message_array.length; i++) {
message_array[i] = 0;
}
}
return UTF8ToString(signature_buffer, signature_length);
});
Account.prototype['one_time_keys'] = restore_stack(function() {
var keys_length = account_method(
Module['_olm_account_one_time_keys_length']
)(this.ptr);
var keys = stack(keys_length + NULL_BYTE_PADDING_LENGTH);
account_method(Module['_olm_account_one_time_keys'])(
this.ptr, keys, keys_length
);
return UTF8ToString(keys, keys_length);
});
Account.prototype['mark_keys_as_published'] = restore_stack(function() {
account_method(Module['_olm_account_mark_keys_as_published'])(this.ptr);
});
Account.prototype['max_number_of_one_time_keys'] = restore_stack(function() {
return account_method(Module['_olm_account_max_number_of_one_time_keys'])(
this.ptr
);
});
Account.prototype['generate_one_time_keys'] = restore_stack(function(
number_of_keys
) {
var random_length = account_method(
Module['_olm_account_generate_one_time_keys_random_length'] )(this.ptr, number_of_keys);
var random = random_stack(random_length);
account_method(Module['_olm_account_generate_one_time_keys'])(
this.ptr, number_of_keys, random, random_length
);
});
Account.prototype['remove_one_time_keys'] = restore_stack(function(session) {
account_method(Module['_olm_remove_one_time_keys'])(
this.ptr, session.ptr
);
});
Account.prototype['generate_fallback_key'] = restore_stack(function() {
var random_length = account_method(
Module['_olm_account_generate_fallback_key_random_length']
)(this.ptr);
var random = random_stack(random_length);
account_method(Module['_olm_account_generate_fallback_key'])(
this.ptr, random, random_length
);
});
Account.prototype['fallback_key'] = restore_stack(function() {
var keys_length = account_method(
Module['_olm_account_fallback_key_length']
)(this.ptr);
var keys = stack(keys_length + NULL_BYTE_PADDING_LENGTH);
account_method(Module['_olm_account_fallback_key'])(
this.ptr, keys, keys_length
);
return UTF8ToString(keys, keys_length);
});
Account.prototype['pickle'] = restore_stack(function(key) {
var key_array = array_from_string(key);
var pickle_length = account_method(
Module['_olm_pickle_account_length']
)(this.ptr);
var key_buffer = stack(key_array);
var pickle_buffer = stack(pickle_length + NULL_BYTE_PADDING_LENGTH);
try {
account_method(Module['_olm_pickle_account'])(
this.ptr, key_buffer, key_array.length, pickle_buffer, pickle_length
);
} finally {
// clear out copies of the pickle key
bzero(key_buffer, key_array.length)
for (var i = 0; i < key_array.length; i++) {
key_array[i] = 0;
}
}
return UTF8ToString(pickle_buffer, pickle_length);
});
Account.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);
try {
account_method(Module['_olm_unpickle_account'])(
this.ptr, key_buffer, key_array.length, pickle_buffer,
pickle_array.length
);
} finally {
// clear out copies of the pickle key
bzero(key_buffer, key_array.length)
for (var i = 0; i < key_array.length; i++) {
key_array[i] = 0; }
}
});
function Session() {
var size = Module['_olm_session_size']();
this.buf = malloc(size);
this.ptr = Module['_olm_session'](this.buf);
}
function session_method(wrapped) {
return function() {
var result = wrapped.apply(this, arguments);
if (result === OLM_ERROR) {
var message = UTF8ToString(
Module['_olm_session_last_error'](arguments[0])
);
throw new Error("OLM." + message);
}
return result;
}
}
Session.prototype['free'] = function() {
Module['_olm_clear_session'](this.ptr);
free(this.ptr);
}
Session.prototype['pickle'] = restore_stack(function(key) {
var key_array = array_from_string(key);
var pickle_length = session_method(
Module['_olm_pickle_session_length']
)(this.ptr);
var key_buffer = stack(key_array);
var pickle_buffer = stack(pickle_length + NULL_BYTE_PADDING_LENGTH);
try {
session_method(Module['_olm_pickle_session'])(
this.ptr, key_buffer, key_array.length, pickle_buffer, pickle_length
);
} finally {
// clear out copies of the pickle key
bzero(key_buffer, key_array.length)
for (var i = 0; i < key_array.length; i++) {
key_array[i] = 0;
}
}
return UTF8ToString(pickle_buffer, pickle_length);
});
Session.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);
try {
session_method(Module['_olm_unpickle_session'])(
this.ptr, key_buffer, key_array.length, pickle_buffer,
pickle_array.length
);
} finally {
// clear out copies of the pickle key
bzero(key_buffer, key_array.length)
for (var i = 0; i < key_array.length; i++) {
key_array[i] = 0;
}
}
});
Session.prototype['create_outbound'] = restore_stack(function(
account, their_identity_key, their_one_time_key) {
var random_length = session_method(
Module['_olm_create_outbound_session_random_length']
)(this.ptr);
var random = random_stack(random_length);
var identity_key_array = array_from_string(their_identity_key);
var one_time_key_array = array_from_string(their_one_time_key);
var identity_key_buffer = stack(identity_key_array);
var one_time_key_buffer = stack(one_time_key_array);
try {
session_method(Module['_olm_create_outbound_session'])(
this.ptr, account.ptr,
identity_key_buffer, identity_key_array.length,
one_time_key_buffer, one_time_key_array.length,
random, random_length
);
} finally {
// clear the random buffer, which is key data
bzero(random, random_length);
}
});
Session.prototype['create_inbound'] = restore_stack(function(
account, one_time_key_message
) {
var message_array = array_from_string(one_time_key_message);
var message_buffer = stack(message_array);
try {
session_method(Module['_olm_create_inbound_session'])(
this.ptr, account.ptr, message_buffer, message_array.length
);
} finally {
// clear out copies of the key
bzero(message_buffer, message_array.length);
for (var i = 0; i < message_array.length; i++) {
message_array[i] = 0;
}
}
});
Session.prototype['create_inbound_from'] = restore_stack(function(
account, identity_key, one_time_key_message
) {
var identity_key_array = array_from_string(identity_key);
var identity_key_buffer = stack(identity_key_array);
var message_array = array_from_string(one_time_key_message);
var message_buffer = stack(message_array);
try {
session_method(Module['_olm_create_inbound_session_from'])(
this.ptr, account.ptr,
identity_key_buffer, identity_key_array.length,
message_buffer, message_array.length
);
} finally {
// clear out copies of the key
bzero(message_buffer, message_array.length);
for (var i = 0; i < message_array.length; i++) {
message_array[i] = 0;
}
}
});
Session.prototype['session_id'] = restore_stack(function() {
var id_length = session_method(Module['_olm_session_id_length'])(this.ptr);
var id_buffer = stack(id_length + NULL_BYTE_PADDING_LENGTH);
session_method(Module['_olm_session_id'])(
this.ptr, id_buffer, id_length
);
return UTF8ToString(id_buffer, id_length);
});
Session.prototype['has_received_message'] = function() {
return session_method(Module['_olm_session_has_received_message'])(
this.ptr
) ? true : false;
};
Session.prototype['matches_inbound'] = restore_stack(function(
one_time_key_message
) {
var message_array = array_from_string(one_time_key_message);
var message_buffer = stack(message_array);
return session_method(Module['_olm_matches_inbound_session'])(
this.ptr, message_buffer, message_array.length
) ? true : false;
});
Session.prototype['matches_inbound_from'] = restore_stack(function(
identity_key, one_time_key_message
) {
var identity_key_array = array_from_string(identity_key);
var identity_key_buffer = stack(identity_key_array);
var message_array = array_from_string(one_time_key_message);
var message_buffer = stack(message_array);
return session_method(Module['_olm_matches_inbound_session_from'])(
this.ptr,
identity_key_buffer, identity_key_array.length,
message_buffer, message_array.length
) ? true : false;
});
Session.prototype['encrypt'] = restore_stack(function(
plaintext
) {
var plaintext_buffer, message_buffer, plaintext_length, random, random_length;
try {
random_length = session_method(
Module['_olm_encrypt_random_length']
)(this.ptr);
var message_type = session_method(
Module['_olm_encrypt_message_type']
)(this.ptr);
plaintext_length = lengthBytesUTF8(plaintext);
var message_length = session_method(
Module['_olm_encrypt_message_length']
)(this.ptr, plaintext_length);
random = random_stack(random_length);
// need to allow space for the terminator (which stringToUTF8 always
// writes), hence + 1.
plaintext_buffer = malloc(plaintext_length + 1);
stringToUTF8(plaintext, plaintext_buffer, plaintext_length + 1);
message_buffer = malloc(message_length + NULL_BYTE_PADDING_LENGTH);
session_method(Module['_olm_encrypt'])(
this.ptr,
plaintext_buffer, plaintext_length,
random, random_length,
message_buffer, message_length
);
// UTF8ToString requires a null-terminated argument, so add the
// null terminator.
setValue(
message_buffer+message_length,
0, "i8" );
return {
"type": message_type,
"body": UTF8ToString(message_buffer, message_length),
};
} finally {
if (random !== undefined) {
// clear out the random buffer, since it is the private key
bzero(random, random_length);
}
if (plaintext_buffer !== undefined) {
// don't leave a copy of the plaintext in the heap.
bzero(plaintext_buffer, plaintext_length + 1);
free(plaintext_buffer);
}
if (message_buffer !== undefined) {
free(message_buffer);
}
}
});
Session.prototype['decrypt'] = restore_stack(function(
message_type, message
) {
var message_buffer, plaintext_buffer, max_plaintext_length;
try {
message_buffer = malloc(message.length);
writeAsciiToMemory(message, message_buffer, true);
max_plaintext_length = session_method(
Module['_olm_decrypt_max_plaintext_length']
)(this.ptr, message_type, message_buffer, message.length);
// caculating the length destroys the input buffer, so we need to re-copy it.
writeAsciiToMemory(message, message_buffer, true);
plaintext_buffer = malloc(max_plaintext_length + NULL_BYTE_PADDING_LENGTH);
var plaintext_length = session_method(Module["_olm_decrypt"])(
this.ptr, message_type,
message_buffer, message.length,
plaintext_buffer, max_plaintext_length
);
// UTF8ToString requires a null-terminated argument, so add the
// null terminator.
setValue(
plaintext_buffer+plaintext_length,
0, "i8"
);
return UTF8ToString(plaintext_buffer, plaintext_length);
} finally {
if (message_buffer !== undefined) {
free(message_buffer);
}
if (plaintext_buffer !== undefined) {
// don't leave a copy of the plaintext in the heap.
bzero(plaintext_buffer, max_plaintext_length);
free(plaintext_buffer);
}
}
});
Session.prototype['describe'] = restore_stack(function() {
var description_buf;
try { description_buf = malloc(256);
session_method(Module['_olm_session_describe'])(
this.ptr, description_buf, 256
);
return UTF8ToString(description_buf);
} finally {
if (description_buf !== undefined) free(description_buf);
}
});
function Utility() {
var size = Module['_olm_utility_size']();
this.buf = malloc(size);
this.ptr = Module['_olm_utility'](this.buf);
}
function utility_method(wrapped) {
return function() {
var result = wrapped.apply(this, arguments);
if (result === OLM_ERROR) {
var message = UTF8ToString(
Module['_olm_utility_last_error'](arguments[0])
);
throw new Error("OLM." + message);
}
return result;
}
}
Utility.prototype['free'] = function() {
Module['_olm_clear_utility'](this.ptr);
free(this.ptr);
}
Utility.prototype['sha256'] = restore_stack(function(input) {
var output_length = utility_method(Module['_olm_sha256_length'])(this.ptr);
var input_array = array_from_string(input);
var input_buffer = stack(input_array);
var output_buffer = stack(output_length + NULL_BYTE_PADDING_LENGTH);
try {
utility_method(Module['_olm_sha256'])(
this.ptr,
input_buffer, input_array.length,
output_buffer, output_length
);
} finally {
// clear out copies of the input buffer, which may be plaintext
bzero(input_buffer, input_array.length);
for (var i = 0; i < input_array.length; i++) {
input_array[i] = 0;
}
}
return UTF8ToString(output_buffer, output_length);
});
Utility.prototype['ed25519_verify'] = restore_stack(function(
key, message, signature
) {
var key_array = array_from_string(key);
var key_buffer = stack(key_array);
var message_array = array_from_string(message);
var message_buffer = stack(message_array);
var signature_array = array_from_string(signature);
var signature_buffer = stack(signature_array);
try {
utility_method(Module['_olm_ed25519_verify'])(
this.ptr,
key_buffer, key_array.length,
message_buffer, message_array.length,
signature_buffer, signature_array.length );
} finally {
// clear out copies of the input buffer, which may be plaintext
bzero(message_buffer, message_array.length);
for (var i = 0; i < message_array.length; i++) {
message_array[i] = 0;
}
}
});
olm_exports["Account"] = Account;
olm_exports["Session"] = Session;
olm_exports["Utility"] = Utility;
olm_exports["PkEncryption"] = PkEncryption;
olm_exports["PkDecryption"] = PkDecryption;
olm_exports["PkSigning"] = PkSigning;
olm_exports["SAS"] = SAS;
olm_exports["get_library_version"] = restore_stack(function() {
var buf = stack(3);
Module['_olm_get_library_version'](buf, buf+1, buf+2);
return [
getValue(buf, 'i8'),
getValue(buf+1, 'i8'),
getValue(buf+2, 'i8'),
];
});