olm/javascript/olm_pk.js
Hubert Chathi ebc156e7c2 re-add null termination in javascript
because older versions of emscripten don't support the length argument to
UTF8ToString.
2019-04-08 15:54:02 -04:00

362 lines
12 KiB
JavaScript

function PkEncryption() {
var size = Module['_olm_pk_encryption_size']();
this.buf = malloc(size);
this.ptr = Module['_olm_pk_encryption'](this.buf);
}
function pk_encryption_method(wrapped) {
return function() {
var result = wrapped.apply(this, arguments);
if (result === OLM_ERROR) {
var message = UTF8ToString(
Module['_olm_pk_encryption_last_error'](arguments[0])
);
throw new Error("OLM." + message);
}
return result;
}
}
PkEncryption.prototype['free'] = function() {
Module['_olm_clear_pk_encryption'](this.ptr);
free(this.ptr);
}
PkEncryption.prototype['set_recipient_key'] = restore_stack(function(key) {
var key_array = array_from_string(key);
var key_buffer = stack(key_array);
pk_encryption_method(Module['_olm_pk_encryption_set_recipient_key'])(
this.ptr, key_buffer, key_array.length
);
});
PkEncryption.prototype['encrypt'] = restore_stack(function(
plaintext
) {
var plaintext_buffer, ciphertext_buffer, plaintext_length, random, random_length;
try {
plaintext_length = lengthBytesUTF8(plaintext)
plaintext_buffer = malloc(plaintext_length + 1);
stringToUTF8(plaintext, plaintext_buffer, plaintext_length + 1);
random_length = pk_encryption_method(
Module['_olm_pk_encrypt_random_length']
)();
random = random_stack(random_length);
var ciphertext_length = pk_encryption_method(
Module['_olm_pk_ciphertext_length']
)(this.ptr, plaintext_length);
ciphertext_buffer = malloc(ciphertext_length + NULL_BYTE_PADDING_LENGTH);
var mac_length = pk_encryption_method(
Module['_olm_pk_mac_length']
)(this.ptr);
var mac_buffer = stack(mac_length + NULL_BYTE_PADDING_LENGTH);
setValue(
mac_buffer + mac_length,
0, "i8"
);
var ephemeral_length = pk_encryption_method(
Module['_olm_pk_key_length']
)();
var ephemeral_buffer = stack(ephemeral_length + NULL_BYTE_PADDING_LENGTH);
setValue(
ephemeral_buffer + ephemeral_length,
0, "i8"
);
pk_encryption_method(Module['_olm_pk_encrypt'])(
this.ptr,
plaintext_buffer, plaintext_length,
ciphertext_buffer, ciphertext_length,
mac_buffer, mac_length,
ephemeral_buffer, ephemeral_length,
random, random_length
);
// UTF8ToString requires a null-terminated argument, so add the
// null terminator.
setValue(
ciphertext_buffer + ciphertext_length,
0, "i8"
);
return {
"ciphertext": UTF8ToString(ciphertext_buffer, ciphertext_length),
"mac": UTF8ToString(mac_buffer, mac_length),
"ephemeral": UTF8ToString(ephemeral_buffer, ephemeral_length)
};
} finally {
if (random !== undefined) {
// clear out the random buffer, since it is key data
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 (ciphertext_buffer !== undefined) {
free(ciphertext_buffer);
}
}
});
function PkDecryption() {
var size = Module['_olm_pk_decryption_size']();
this.buf = malloc(size);
this.ptr = Module['_olm_pk_decryption'](this.buf);
}
function pk_decryption_method(wrapped) {
return function() {
var result = wrapped.apply(this, arguments);
if (result === OLM_ERROR) {
var message = UTF8ToString(
Module['_olm_pk_decryption_last_error'](arguments[0])
);
throw new Error("OLM." + message);
}
return result;
}
}
PkDecryption.prototype['free'] = function() {
Module['_olm_clear_pk_decryption'](this.ptr);
free(this.ptr);
}
PkDecryption.prototype['init_with_private_key'] = restore_stack(function (private_key) {
var private_key_buffer = stack(private_key.length);
Module['HEAPU8'].set(private_key, private_key_buffer);
var pubkey_length = pk_decryption_method(
Module['_olm_pk_key_length']
)();
var pubkey_buffer = stack(pubkey_length + NULL_BYTE_PADDING_LENGTH);
try {
pk_decryption_method(Module['_olm_pk_key_from_private'])(
this.ptr,
pubkey_buffer, pubkey_length,
private_key_buffer, private_key.length
);
} finally {
// clear out our copy of the private key
bzero(private_key_buffer, private_key.length);
}
return UTF8ToString(pubkey_buffer, pubkey_length);
});
PkDecryption.prototype['generate_key'] = restore_stack(function () {
var random_length = pk_decryption_method(
Module['_olm_pk_private_key_length']
)();
var random_buffer = random_stack(random_length);
var pubkey_length = pk_decryption_method(
Module['_olm_pk_key_length']
)();
var pubkey_buffer = stack(pubkey_length + NULL_BYTE_PADDING_LENGTH);
try {
pk_decryption_method(Module['_olm_pk_key_from_private'])(
this.ptr,
pubkey_buffer, pubkey_length,
random_buffer, random_length
);
} finally {
// clear out the random buffer (= private key)
bzero(random_buffer, random_length);
}
return UTF8ToString(pubkey_buffer, pubkey_length);
});
PkDecryption.prototype['get_private_key'] = restore_stack(function () {
var privkey_length = pk_encryption_method(
Module['_olm_pk_private_key_length']
)();
var privkey_buffer = stack(privkey_length);
pk_decryption_method(Module['_olm_pk_get_private_key'])(
this.ptr,
privkey_buffer, privkey_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 key_arr = new Uint8Array(
new Uint8Array(Module['HEAPU8'].buffer, privkey_buffer, privkey_length)
);
bzero(privkey_buffer, privkey_length); // clear out our copy of the key
return key_arr;
});
PkDecryption.prototype['pickle'] = restore_stack(function (key) {
var key_array = array_from_string(key);
var pickle_length = pk_decryption_method(
Module['_olm_pickle_pk_decryption_length']
)(this.ptr);
var key_buffer = stack(key_array);
var pickle_buffer = stack(pickle_length + NULL_BYTE_PADDING_LENGTH);
try {
pk_decryption_method(Module['_olm_pickle_pk_decryption'])(
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);
});
PkDecryption.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);
var ephemeral_length = pk_decryption_method(
Module["_olm_pk_key_length"]
)();
var ephemeral_buffer = stack(ephemeral_length + NULL_BYTE_PADDING_LENGTH);
try {
pk_decryption_method(Module['_olm_unpickle_pk_decryption'])(
this.ptr, key_buffer, key_array.length, pickle_buffer,
pickle_array.length, ephemeral_buffer, ephemeral_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(ephemeral_buffer, ephemeral_length);
});
PkDecryption.prototype['decrypt'] = restore_stack(function (
ephemeral_key, mac, ciphertext
) {
var plaintext_buffer, ciphertext_buffer, plaintext_max_length;
try {
var ciphertext_length = lengthBytesUTF8(ciphertext)
ciphertext_buffer = malloc(ciphertext_length + 1);
stringToUTF8(ciphertext, ciphertext_buffer, ciphertext_length + 1);
var ephemeralkey_array = array_from_string(ephemeral_key);
var ephemeralkey_buffer = stack(ephemeralkey_array);
var mac_array = array_from_string(mac);
var mac_buffer = stack(mac_array);
plaintext_max_length = pk_decryption_method(Module['_olm_pk_max_plaintext_length'])(
this.ptr,
ciphertext_length
);
plaintext_buffer = malloc(plaintext_max_length + NULL_BYTE_PADDING_LENGTH);
var plaintext_length = pk_decryption_method(Module['_olm_pk_decrypt'])(
this.ptr,
ephemeralkey_buffer, ephemeralkey_array.length,
mac_buffer, mac_array.length,
ciphertext_buffer, ciphertext_length,
plaintext_buffer, plaintext_max_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 (plaintext_buffer !== undefined) {
// don't leave a copy of the plaintext in the heap.
bzero(plaintext_buffer, plaintext_length + 1);
free(plaintext_buffer);
}
if (ciphertext_buffer !== undefined) {
free(ciphertext_buffer);
}
}
})
function PkSigning() {
var size = Module['_olm_pk_signing_size']();
this.buf = malloc(size);
this.ptr = Module['_olm_pk_signing'](this.buf);
}
function pk_signing_method(wrapped) {
return function() {
var result = wrapped.apply(this, arguments);
if (result === OLM_ERROR) {
var message = UTF8ToString(
Module['_olm_pk_signing_last_error'](arguments[0])
);
throw new Error("OLM." + message);
}
return result;
}
}
PkSigning.prototype['free'] = function() {
Module['_olm_clear_pk_signing'](this.ptr);
free(this.ptr);
}
PkSigning.prototype['init_with_seed'] = restore_stack(function (seed) {
var seed_buffer = stack(seed.length);
Module['HEAPU8'].set(seed, seed_buffer);
var pubkey_length = pk_signing_method(
Module['_olm_pk_signing_public_key_length']
)();
var pubkey_buffer = stack(pubkey_length + NULL_BYTE_PADDING_LENGTH);
try {
pk_signing_method(Module['_olm_pk_signing_key_from_seed'])(
this.ptr,
pubkey_buffer, pubkey_length,
seed_buffer, seed.length
);
} finally {
// clear out our copy of the seed
bzero(seed_buffer, seed.length);
}
return UTF8ToString(pubkey_buffer, pubkey_length);
});
PkSigning.prototype['generate_seed'] = restore_stack(function () {
var random_length = pk_signing_method(
Module['_olm_pk_signing_seed_length']
)();
var random_buffer = random_stack(random_length);
var key_arr = new Uint8Array(
new Uint8Array(Module['HEAPU8'].buffer, random_buffer, random_length)
);
bzero(random_buffer, random_length);
return key_arr;
});
PkSigning.prototype['sign'] = restore_stack(function (message) {
// XXX: Should be able to sign any bytes rather than just strings,
// but this is consistent with encrypt for now.
//var message_buffer = stack(message.length);
//Module['HEAPU8'].set(message, message_buffer);
var message_buffer, message_length;
try {
message_length = lengthBytesUTF8(message)
message_buffer = malloc(message_length + 1);
stringToUTF8(message, message_buffer, message_length + 1);
var sig_length = pk_signing_method(
Module['_olm_pk_signature_length']
)();
var sig_buffer = stack(sig_length + NULL_BYTE_PADDING_LENGTH);
pk_signing_method(Module['_olm_pk_sign'])(
this.ptr,
message_buffer, message_length,
sig_buffer, sig_length
);
return UTF8ToString(sig_buffer, sig_length);
} finally {
if (message_buffer !== undefined) {
// don't leave a copy of the plaintext in the heap.
bzero(message_buffer, message_length + 1);
free(message_buffer);
}
}
});