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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 = Pointer_stringify(
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;
try {
plaintext_length = Module['lengthBytesUTF8'](plaintext)
plaintext_buffer = malloc(plaintext_length + 1);
Module['stringToUTF8'](plaintext, plaintext_buffer, plaintext_length + 1);
var random_length = pk_encryption_method(
Module['_olm_pk_encrypt_random_length']
)();
var 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);
Module['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);
Module['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.
Module['setValue'](
ciphertext_buffer+ciphertext_length,
0, "i8"
);
return {
"ciphertext": Module['UTF8ToString'](ciphertext_buffer),
"mac": Pointer_stringify(mac_buffer),
"ephemeral": Pointer_stringify(ephemeral_buffer)
};
} 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 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 = Pointer_stringify(
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['generate_key'] = restore_stack(function () {
var random_length = pk_decryption_method(
Module['_olm_pk_generate_key_random_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);
pk_decryption_method(Module['_olm_pk_generate_key'])(
this.ptr,
pubkey_buffer, pubkey_length,
random_buffer, random_length
);
return Pointer_stringify(pubkey_buffer);
});
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);
pk_decryption_method(Module['_olm_pickle_pk_decryption'])(
this.ptr, key_buffer, key_array.length, pickle_buffer, pickle_length
);
return Pointer_stringify(pickle_buffer);
});
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);
pk_decryption_method(Module['_olm_unpickle_pk_decryption'])(
this.ptr, key_buffer, key_array.length, pickle_buffer,
pickle_array.length, ephemeral_buffer, ephemeral_length
);
return Pointer_stringify(ephemeral_buffer);
});
PkDecryption.prototype['decrypt'] = restore_stack(function (
ephemeral_key, mac, ciphertext
) {
var plaintext_buffer, ciphertext_buffer, plaintext_max_length;
try {
ciphertext_length = Module['lengthBytesUTF8'](ciphertext)
ciphertext_buffer = malloc(ciphertext_length + 1);
Module['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.
Module['setValue'](
plaintext_buffer+plaintext_length,
0, "i8"
);
return Module['UTF8ToString'](plaintext_buffer);
} 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);
}
}
})
|
