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/*
This file is part of TALER
(C) 2015 GNUnet e.V.
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* Medium-level interface to emscripten-compiled modules used
* by the wallet. Handles memory management by allocating by allocating
* objects in arenas that then can be disposed of all at once.
*
* The high-level interface (using WebWorkers) is exposed in src/cryptoApi.ts.
*/
/**
* Imports.
*/
import { AmountJson } from "../amounts";
import { EmscFunGen, EmscLib } from "./emscLoader";
// Will be set only after initialization.
let maybeEmscEnv: EmscEnvironment | undefined = undefined;
export function isInitialized() {
return !!maybeEmscEnv;
}
export function initialize(lib: EmscLib) {
if (!lib) {
throw Error("library must be object");
}
if (maybeEmscEnv) {
throw Error("emsc lib already initialized");
}
maybeEmscEnv = new EmscEnvironment(lib);
}
function emsc() {
if (maybeEmscEnv) {
return maybeEmscEnv;
}
throw Error("cannot use taler emscripten before initialization");
}
/**
* Size of a native pointer. Must match the size
* use when compiling via emscripten.
*/
const PTR_SIZE = 4;
const GNUNET_OK = 1;
interface EmscFunctions {
amount_add(a1: number, a2: number, a3: number): number;
amount_cmp(a1: number, a2: number): number;
amount_get_zero(a1: string, a2: number): number;
amount_hton(a1: number, a2: number): void;
amount_normalize(a1: number): void;
amount_ntoh(a1: number, a2: number): void;
amount_subtract(a1: number, a2: number, a3: number): number;
ecdh_eddsa(a1: number, a2: number, a3: number): number;
eddsa_sign(a1: number, a2: number, a3: number): number;
eddsa_verify(a1: number, a2: number, a3: number, a4: number): number;
free(ptr: number): void;
get_currency(a: number): string;
get_fraction(a: number): number;
get_value(a: number): number;
hash(a1: number, a2: number, a3: number): void;
hash_context_abort(ctx: number): void;
hash_context_finish(a1: number, a2: number): void;
hash_context_read(a1: number, a2: number, a3: number): void;
hash_create_random(a1: number, a2: number): void;
memmove(a1: number, a2: number, a3: number): number;
random_block(a1: number, a2: number, a3: number): void;
rsa_blinding_key_free(a1: number): void;
rsa_public_key_free(a1: number): void;
rsa_signature_free(a1: number): void;
setup_fresh_coin(a1: number, a2: number, a3: number): void;
string_to_data(a1: number, a2: number, a3: number, a4: number): number;
}
interface EmscAllocFunctions {
data_to_string_alloc(a1: number, a2: number): number;
ecdhe_key_create(): number;
ecdhe_public_key_from_private(a1: number): number;
ecdsa_key_create(): number;
ecdsa_public_key_from_private(a1: number): number;
eddsa_key_create(): number;
eddsa_public_key_from_private(a1: number): number;
get_amount(a1: number, a2: number, a22: number, a3: string): number;
hash_context_start(): number;
malloc(size: number): number;
purpose_create(a1: number, a2: number, a3: number): number;
rsa_blind(a1: number, a2: number, a3: number, a4: number, a5: number): number;
rsa_blinding_key_create(a1: number): number;
rsa_blinding_key_decode(a1: number, a2: number): number;
rsa_blinding_key_encode(a1: number, a2: number): number;
rsa_public_key_decode(a1: number, a2: number): number;
rsa_public_key_encode(a1: number, a2: number): number;
rsa_signature_encode(a1: number, a2: number): number;
rsa_signature_decode(a1: number, a2: number): number;
rsa_unblind(a1: number, a2: number, a3: number): number;
}
class EmscEnvironment {
/**
* Emscripten functions that don't do any memory allocations.
*/
public funcs: EmscFunctions;
/**
* Emscripten functions that allocate memory.
*/
public allocFuncs: EmscAllocFunctions;
public lib: EmscLib;
constructor(lib: EmscLib) {
const getEmsc: EmscFunGen = (name: string, ret: any, argTypes: any[]) => {
return (...args: any[]) => {
return lib.ccall(name, ret, argTypes, args);
};
};
this.lib = lib;
this.allocFuncs = {
data_to_string_alloc: getEmsc("GNUNET_STRINGS_data_to_string_alloc", "number", ["number", "number"]),
ecdhe_key_create: getEmsc("GNUNET_CRYPTO_ecdhe_key_create", "number", []),
ecdhe_public_key_from_private: getEmsc( "TALER_WRALL_ecdhe_public_key_from_private", "number", ["number"]),
ecdsa_key_create: getEmsc("GNUNET_CRYPTO_ecdsa_key_create", "number", []),
ecdsa_public_key_from_private: getEmsc( "TALER_WRALL_ecdsa_public_key_from_private", "number", ["number"]),
eddsa_key_create: getEmsc("GNUNET_CRYPTO_eddsa_key_create", "number", []),
eddsa_public_key_from_private: getEmsc( "TALER_WRALL_eddsa_public_key_from_private", "number", ["number"]),
get_amount: getEmsc("TALER_WRALL_get_amount", "number", ["number", "number", "string"]),
hash_context_start: getEmsc("GNUNET_CRYPTO_hash_context_start", "number", []),
malloc: (size: number) => lib._malloc(size),
purpose_create: getEmsc("TALER_WRALL_purpose_create", "number", ["number", "number", "number"]),
rsa_blind: getEmsc("GNUNET_CRYPTO_rsa_blind", "number", ["number", "number", "number", "number", "number"]),
rsa_blinding_key_create: getEmsc("GNUNET_CRYPTO_rsa_blinding_key_create", "number", ["number"]),
rsa_blinding_key_decode: getEmsc("GNUNET_CRYPTO_rsa_blinding_key_decode", "number", ["number", "number"]),
rsa_blinding_key_encode: getEmsc("GNUNET_CRYPTO_rsa_blinding_key_encode", "number", ["number", "number"]),
rsa_public_key_decode: getEmsc("GNUNET_CRYPTO_rsa_public_key_decode", "number", ["number", "number"]),
rsa_public_key_encode: getEmsc("GNUNET_CRYPTO_rsa_public_key_encode", "number", ["number", "number"]),
rsa_signature_decode: getEmsc("GNUNET_CRYPTO_rsa_signature_decode", "number", ["number", "number"]),
rsa_signature_encode: getEmsc("GNUNET_CRYPTO_rsa_signature_encode", "number", ["number", "number"]),
rsa_unblind: getEmsc("GNUNET_CRYPTO_rsa_unblind", "number", ["number", "number", "number"]),
};
this.funcs = {
amount_add: getEmsc("TALER_amount_add", "number", ["number", "number", "number"]),
amount_cmp: getEmsc("TALER_amount_cmp", "number", ["number", "number"]),
amount_get_zero: getEmsc("TALER_amount_get_zero", "number", ["string", "number"]),
amount_hton: getEmsc("TALER_amount_hton", "void", ["number", "number"]),
amount_normalize: getEmsc("TALER_amount_normalize", "void", ["number"]),
amount_ntoh: getEmsc("TALER_amount_ntoh", "void", ["number", "number"]),
amount_subtract: getEmsc("TALER_amount_subtract", "number", ["number", "number", "number"]),
ecdh_eddsa: getEmsc("GNUNET_CRYPTO_ecdh_eddsa", "number", ["number", "number", "number"]),
eddsa_sign: getEmsc("GNUNET_CRYPTO_eddsa_sign", "number", ["number", "number", "number"]),
eddsa_verify: getEmsc("GNUNET_CRYPTO_eddsa_verify", "number", ["number", "number", "number", "number"]),
free: (ptr: number) => lib._free(ptr),
get_currency: getEmsc("TALER_WR_get_currency", "string", ["number"]),
get_fraction: getEmsc("TALER_WR_get_fraction", "number", ["number"]),
get_value: getEmsc("TALER_WR_get_value", "number", ["number"]),
hash: getEmsc("GNUNET_CRYPTO_hash", "void", ["number", "number", "number"]),
hash_context_abort: getEmsc("GNUNET_CRYPTO_hash_context_abort", "void", ["number"]),
hash_context_finish: getEmsc("GNUNET_CRYPTO_hash_context_finish", "void", ["number", "number"]),
hash_context_read: getEmsc("GNUNET_CRYPTO_hash_context_read", "void", ["number", "number", "number"]),
hash_create_random: getEmsc("GNUNET_CRYPTO_hash_create_random", "void", ["number", "number"]),
memmove: getEmsc("memmove", "number", ["number", "number", "number"]),
random_block: getEmsc("GNUNET_CRYPTO_random_block", "void", ["number", "number", "number"]),
rsa_blinding_key_free: getEmsc("GNUNET_CRYPTO_rsa_blinding_key_free", "void", ["number"]),
rsa_public_key_free: getEmsc("GNUNET_CRYPTO_rsa_public_key_free", "void", ["number"]),
rsa_signature_free: getEmsc("GNUNET_CRYPTO_rsa_signature_free", "void", ["number"]),
setup_fresh_coin: getEmsc("TALER_setup_fresh_coin", "void", ["number", "number", "number"]),
string_to_data: getEmsc("GNUNET_STRINGS_string_to_data", "number", ["number", "number", "number", "number"]),
};
}
}
/**
* Constants for signatures purposes, define what the signatures vouches for.
*/
export enum SignaturePurpose {
RESERVE_WITHDRAW = 1200,
WALLET_COIN_DEPOSIT = 1201,
MASTER_DENOMINATION_KEY_VALIDITY = 1025,
WALLET_COIN_MELT = 1202,
TEST = 4242,
MERCHANT_PAYMENT_OK = 1104,
MASTER_WIRE_FEES = 1028,
WALLET_COIN_PAYBACK = 1203,
}
/**
* Desired quality levels for random numbers.
*/
export enum RandomQuality {
WEAK = 0,
STRONG = 1,
NONCE = 2,
}
/**
* Object that is allocated in some arena.
*/
interface ArenaObject {
destroy(): void;
}
/**
* Context for cummulative hashing.
*/
export class HashContext implements ArenaObject {
private hashContextPtr: number | undefined;
constructor() {
this.hashContextPtr = emsc().allocFuncs.hash_context_start();
}
/**
* Add data to be hashed.
*/
read(obj: PackedArenaObject): void {
if (!this.hashContextPtr) {
throw Error("assertion failed");
}
emsc().funcs.hash_context_read(this.hashContextPtr, obj.nativePtr, obj.size());
}
/**
* Finish the hash computation.
*/
finish(h: HashCode) {
if (!this.hashContextPtr) {
throw Error("assertion failed");
}
h.alloc();
emsc().funcs.hash_context_finish(this.hashContextPtr, h.nativePtr);
}
/**
* Abort hashing without computing the result.
*/
destroy(): void {
if (this.hashContextPtr) {
emsc().funcs.hash_context_abort(this.hashContextPtr);
}
this.hashContextPtr = undefined;
}
}
/**
* Arena object that points to an allocated block of memory.
*/
abstract class MallocArenaObject implements ArenaObject {
protected _nativePtr: number | undefined = undefined;
/**
* Is this a weak reference to the underlying memory?
*/
isWeak = false;
destroy(): void {
if (this._nativePtr && !this.isWeak) {
emsc().funcs.free(this.nativePtr);
this._nativePtr = undefined;
}
}
constructor(arena?: Arena) {
if (!arena) {
if (arenaStack.length === 0) {
throw Error("No arena available");
}
arena = arenaStack[arenaStack.length - 1];
}
arena.put(this);
}
alloc(size: number) {
if (this._nativePtr !== undefined) {
throw Error("Double allocation");
}
this.nativePtr = emsc().allocFuncs.malloc(size);
}
set nativePtr(v: number) {
if (v === undefined) {
throw Error("Native pointer must be a number or null");
}
this._nativePtr = v;
}
get nativePtr() {
// We want to allow latent allocation
// of native wrappers, but we never want to
// pass 'undefined' to emscripten.
if (this._nativePtr === undefined) {
throw Error("Native pointer not initialized");
}
return this._nativePtr;
}
}
/**
* An arena stores objects that will be deallocated
* at the same time.
*/
interface Arena {
put(obj: ArenaObject): void;
destroy(): void;
}
/**
* Arena that must be manually destroyed.
*/
class SimpleArena implements Arena {
protected heap: ArenaObject[];
constructor() {
this.heap = [];
}
put(obj: ArenaObject) {
this.heap.push(obj);
}
destroy() {
for (const obj of this.heap) {
obj.destroy();
}
this.heap = [];
}
}
/**
* Arena that destroys all its objects once control has returned to the message
* loop.
*/
class SyncArena extends SimpleArena {
private isScheduled: boolean;
constructor() {
super();
}
pub(obj: MallocArenaObject) {
super.put(obj);
if (!this.isScheduled) {
this.schedule();
}
this.heap.push(obj);
}
private schedule() {
this.isScheduled = true;
Promise.resolve().then(() => {
this.isScheduled = false;
this.destroy();
});
}
}
export const arenaStack: Arena[] = [];
arenaStack.push(new SyncArena());
/**
* Representation of monetary value in a given currency.
*/
export class Amount extends MallocArenaObject {
constructor(args?: AmountJson, arena?: Arena) {
super(arena);
if (args) {
this.nativePtr = emsc().allocFuncs.get_amount(args.value,
0,
args.fraction,
args.currency);
} else {
this.nativePtr = emsc().allocFuncs.get_amount(0, 0, 0, "");
}
}
static getZero(currency: string, a?: Arena): Amount {
const am = new Amount(undefined, a);
const r = emsc().funcs.amount_get_zero(currency, am.nativePtr);
if (r !== GNUNET_OK) {
throw Error("invalid currency");
}
return am;
}
toNbo(a?: Arena): AmountNbo {
const x = new AmountNbo(a);
x.alloc();
emsc().funcs.amount_hton(x.nativePtr, this.nativePtr);
return x;
}
fromNbo(nbo: AmountNbo): void {
emsc().funcs.amount_ntoh(this.nativePtr, nbo.nativePtr);
}
get value() {
return emsc().funcs.get_value(this.nativePtr);
}
get fraction() {
return emsc().funcs.get_fraction(this.nativePtr);
}
get currency(): string {
return emsc().funcs.get_currency(this.nativePtr);
}
toJson(): AmountJson {
return {
currency: emsc().funcs.get_currency(this.nativePtr),
fraction: emsc().funcs.get_fraction(this.nativePtr),
value: emsc().funcs.get_value(this.nativePtr),
};
}
/**
* Add an amount to this amount.
*/
add(a: Amount) {
const res = emsc().funcs.amount_add(this.nativePtr, a.nativePtr, this.nativePtr);
if (res < 1) {
// Overflow
return false;
}
return true;
}
/**
* Perform saturating subtraction on amounts.
*/
sub(a: Amount) {
// this = this - a
const res = emsc().funcs.amount_subtract(this.nativePtr, this.nativePtr, a.nativePtr);
if (res === 0) {
// Underflow
return false;
}
if (res > 0) {
return true;
}
throw Error("Incompatible currencies");
}
cmp(a: Amount) {
// If we don't check this, the c code aborts.
if (this.currency !== a.currency) {
throw Error(`incomparable currencies (${this.currency} and ${a.currency})`);
}
return emsc().funcs.amount_cmp(this.nativePtr, a.nativePtr);
}
normalize() {
emsc().funcs.amount_normalize(this.nativePtr);
}
}
/**
* Count the UTF-8 characters in a JavaScript string.
*/
function countUtf8Bytes(str: string): number {
let s = str.length;
// JavaScript strings are UTF-16 arrays
for (let i = str.length - 1; i >= 0; i--) {
const code = str.charCodeAt(i);
if (code > 0x7f && code <= 0x7ff) {
// We need an extra byte in utf-8 here
s++;
} else if (code > 0x7ff && code <= 0xffff) {
// We need two extra bytes in utf-8 here
s += 2;
}
// Skip over the other surrogate
if (code >= 0xDC00 && code <= 0xDFFF) {
i--;
}
}
return s;
}
/**
* Managed reference to a contiguous block of memory in the Emscripten heap.
* Can be converted from / to a serialized representation.
* Should contain only data, not pointers.
*/
abstract class PackedArenaObject extends MallocArenaObject {
abstract size(): number;
constructor(a?: Arena) {
super(a);
}
randomize(qual: RandomQuality = RandomQuality.STRONG): void {
emsc().funcs.random_block(qual, this.nativePtr, this.size());
}
toCrock(): string {
const d = emsc().allocFuncs.data_to_string_alloc(this.nativePtr, this.size());
const s = emsc().lib.Pointer_stringify(d);
emsc().funcs.free(d);
return s;
}
toJson(): any {
// Per default, the json encoding of
// packed arena objects is just the crockford encoding.
// Subclasses typically want to override this.
return this.toCrock();
}
loadCrock(s: string) {
this.alloc();
// We need to get the javascript string
// to the emscripten heap first.
const buf = ByteArray.fromStringWithNull(s);
const res = emsc().funcs.string_to_data(buf.nativePtr,
s.length,
this.nativePtr,
this.size());
buf.destroy();
if (res < 1) {
throw {error: "wrong encoding"};
}
}
alloc() {
// FIXME: should the client be allowed to call alloc multiple times?
if (!this._nativePtr) {
this.nativePtr = emsc().allocFuncs.malloc(this.size());
}
}
hash(): HashCode {
const x = new HashCode();
x.alloc();
emsc().funcs.hash(this.nativePtr, this.size(), x.nativePtr);
return x;
}
hexdump() {
const bytes: string[] = [];
for (let i = 0; i < this.size(); i++) {
let b = emsc().lib.getValue(this.nativePtr + i, "i8");
b = (b + 256) % 256;
bytes.push("0".concat(b.toString(16)).slice(-2));
}
const lines: string[] = [];
for (let i = 0; i < bytes.length; i += 8) {
lines.push(bytes.slice(i, i + 8).join(","));
}
return lines.join("\n");
}
}
/**
* Amount, encoded for network transmission.
*/
export class AmountNbo extends PackedArenaObject {
size() {
return 24;
}
toJson(): any {
const a = new SimpleArena();
const am = new Amount(undefined, a);
am.fromNbo(this);
const json = am.toJson();
a.destroy();
return json;
}
}
/**
* Create a packed arena object from the base32 crockford encoding.
*/
function fromCrock<T extends PackedArenaObject>(s: string, ctor: Ctor<T>): T {
const x: T = new ctor();
x.alloc();
x.loadCrock(s);
return x;
}
/**
* Create a packed arena object from the base32 crockford encoding for objects
* that have a special decoding function.
*/
function fromCrockDecoded<T extends MallocArenaObject>(s: string,
ctor: Ctor<T>,
decodeFn: (p: number, s: number) => number): T {
const obj = new ctor();
const buf = ByteArray.fromCrock(s);
obj.nativePtr = decodeFn(buf.nativePtr, buf.size());
buf.destroy();
return obj;
}
/**
* Encode an object using a special encoding function.
*/
function encode<T extends MallocArenaObject>(obj: T, encodeFn: any, arena?: Arena): ByteArray {
const ptr = emsc().allocFuncs.malloc(PTR_SIZE);
const len = encodeFn(obj.nativePtr, ptr);
const res = new ByteArray(len, undefined, arena);
res.nativePtr = emsc().lib.getValue(ptr, "*");
emsc().funcs.free(ptr);
return res;
}
/**
* Private EdDSA key.
*/
export class EddsaPrivateKey extends PackedArenaObject {
static create(a?: Arena): EddsaPrivateKey {
const obj = new EddsaPrivateKey(a);
obj.nativePtr = emsc().allocFuncs.eddsa_key_create();
return obj;
}
size() {
return 32;
}
getPublicKey(a?: Arena): EddsaPublicKey {
const obj = new EddsaPublicKey(a);
obj.nativePtr = emsc().allocFuncs.eddsa_public_key_from_private(this.nativePtr);
return obj;
}
static fromCrock(s: string): EddsaPrivateKey {
return fromCrock(s, this);
}
}
/**
* Low-level handle to an EdDSA private key.
*/
export class EcdsaPrivateKey extends PackedArenaObject {
static create(a?: Arena): EcdsaPrivateKey {
const obj = new EcdsaPrivateKey(a);
obj.nativePtr = emsc().allocFuncs.ecdsa_key_create();
return obj;
}
size() {
return 32;
}
getPublicKey(a?: Arena): EcdsaPublicKey {
const obj = new EcdsaPublicKey(a);
obj.nativePtr = emsc().allocFuncs.ecdsa_public_key_from_private(this.nativePtr);
return obj;
}
static fromCrock(s: string): EcdsaPrivateKey {
return fromCrock(s, this);
}
}
/**
* Low-level handle to an ECDHE private key.
*/
export class EcdhePrivateKey extends PackedArenaObject {
static create(a?: Arena): EcdhePrivateKey {
const obj = new EcdhePrivateKey(a);
obj.nativePtr = emsc().allocFuncs.ecdhe_key_create();
return obj;
}
size() {
return 32;
}
getPublicKey(a?: Arena): EcdhePublicKey {
const obj = new EcdhePublicKey(a);
obj.nativePtr = emsc().allocFuncs.ecdhe_public_key_from_private(this.nativePtr);
return obj;
}
static fromCrock(s: string): EcdhePrivateKey {
return fromCrock(s, this);
}
}
/**
* Constructor for a given type.
*/
interface Ctor<T> {
new(): T;
}
/**
* Low-level handle to an EdDSA public key.
*/
export class EddsaPublicKey extends PackedArenaObject {
size() {
return 32;
}
static fromCrock(s: string): EddsaPublicKey {
return fromCrock(s, this);
}
}
/**
* Low-level handle to an ECDSA public key.
*/
export class EcdsaPublicKey extends PackedArenaObject {
size() {
return 32;
}
static fromCrock(s: string): EcdsaPublicKey {
return fromCrock(s, this);
}
}
/**
* Low-level handle to an ECDHE public key.
*/
export class EcdhePublicKey extends PackedArenaObject {
size() {
return 32;
}
static fromCrock(s: string): EcdhePublicKey {
return fromCrock(s, this);
}
}
/**
* Low-level handle to a blinding key secret.
*/
export class RsaBlindingKeySecret extends PackedArenaObject {
size() {
return 32;
}
/**
* Create a random blinding key secret.
*/
static create(a?: Arena): RsaBlindingKeySecret {
const o = new RsaBlindingKeySecret(a);
o.alloc();
o.randomize();
return o;
}
static fromCrock(s: string): RsaBlindingKeySecret {
return fromCrock(s, this);
}
}
/**
* Low-level handle to a hash code.
*/
export class HashCode extends PackedArenaObject {
size() {
return 64;
}
static fromCrock(s: string): HashCode {
return fromCrock(s, this);
}
random(qual: RandomQuality = RandomQuality.STRONG) {
this.alloc();
emsc().funcs.hash_create_random(qual, this.nativePtr);
}
}
/**
* Low-level handle to a byte array.
*/
export class ByteArray extends PackedArenaObject {
private allocatedSize: number;
size() {
return this.allocatedSize;
}
constructor(desiredSize: number, init?: number, a?: Arena) {
super(a);
if (init === undefined) {
this.nativePtr = emsc().allocFuncs.malloc(desiredSize);
} else {
this.nativePtr = init;
}
this.allocatedSize = desiredSize;
}
static fromStringWithoutNull(s: string, a?: Arena): ByteArray {
// UTF-8 bytes, including 0-terminator
const terminatedByteLength = countUtf8Bytes(s) + 1;
const hstr = emsc().allocFuncs.malloc(terminatedByteLength);
emsc().lib.stringToUTF8(s, hstr, terminatedByteLength);
return new ByteArray(terminatedByteLength - 1, hstr, a);
}
static fromStringWithNull(s: string, a?: Arena): ByteArray {
// UTF-8 bytes, including 0-terminator
const terminatedByteLength = countUtf8Bytes(s) + 1;
const hstr = emsc().allocFuncs.malloc(terminatedByteLength);
emsc().lib.stringToUTF8(s, hstr, terminatedByteLength);
return new ByteArray(terminatedByteLength, hstr, a);
}
static fromCrock(s: string, a?: Arena): ByteArray {
// this one is a bit more complicated than the other fromCrock functions,
// since we don't have a fixed size
const byteLength = countUtf8Bytes(s);
const hstr = emsc().allocFuncs.malloc(byteLength + 1);
emsc().lib.stringToUTF8(s, hstr, byteLength + 1);
const decodedLen = Math.floor((byteLength * 5) / 8);
const ba = new ByteArray(decodedLen, undefined, a);
const res = emsc().funcs.string_to_data(hstr, byteLength, ba.nativePtr, decodedLen);
emsc().funcs.free(hstr);
if (res !== GNUNET_OK) {
throw Error("decoding failed");
}
return ba;
}
}
/**
* Data to sign, together with a header that includes a purpose id
* and size.
*/
export class EccSignaturePurpose extends PackedArenaObject {
size() {
return this.payloadSize + 8;
}
private payloadSize: number;
constructor(purpose: SignaturePurpose,
payload: PackedArenaObject,
a?: Arena) {
super(a);
this.nativePtr = emsc().allocFuncs.purpose_create(purpose,
payload.nativePtr,
payload.size());
this.payloadSize = payload.size();
}
}
abstract class SignatureStruct {
abstract fieldTypes(): any[];
abstract purpose(): SignaturePurpose;
private members: any = {};
constructor(x: { [name: string]: any }) {
for (const k in x) {
this.set(k, x[k]);
}
}
toPurpose(a?: Arena): EccSignaturePurpose {
let totalSize = 0;
for (const f of this.fieldTypes()) {
const name = f[0];
const member = this.members[name];
if (!member) {
throw Error(`Member ${name} not set`);
}
totalSize += member.size();
}
const buf = emsc().allocFuncs.malloc(totalSize);
let ptr = buf;
for (const f of this.fieldTypes()) {
const name = f[0];
const member = this.members[name];
const size = member.size();
emsc().funcs.memmove(ptr, member.nativePtr, size);
ptr += size;
}
const ba = new ByteArray(totalSize, buf, a);
return new EccSignaturePurpose(this.purpose(), ba);
}
toJson() {
const res: any = {};
for (const f of this.fieldTypes()) {
const name = f[0];
const member = this.members[name];
if (!member) {
throw Error(`Member ${name} not set`);
}
res[name] = member.toJson();
}
res.purpose = this.purpose();
return res;
}
protected set(name: string, value: PackedArenaObject) {
const typemap: any = {};
for (const f of this.fieldTypes()) {
typemap[f[0]] = f[1];
}
if (!(name in typemap)) {
throw Error(`Key ${name} not found`);
}
if (!(value instanceof typemap[name])) {
throw Error("Wrong type for ${name}");
}
this.members[name] = value;
}
}
/**
* Arguments to constructor of [[WithdrawRequestPS]].
*/
export interface WithdrawRequestPS_Args {
/**
* Reserve public key.
*/
reserve_pub: EddsaPublicKey;
/**
* Amount with fee.
*/
amount_with_fee: AmountNbo;
/**
* Withdraw fee.
*/
withdraw_fee: AmountNbo;
/**
* Hash of denomination public key.
*/
h_denomination_pub: HashCode;
/**
* Hash of coin envelope.
*/
h_coin_envelope: HashCode;
}
/**
* Low-level handle to a WithdrawRequest signature structure.
*/
export class WithdrawRequestPS extends SignatureStruct {
constructor(w: WithdrawRequestPS_Args) {
super(w);
}
purpose() {
return SignaturePurpose.RESERVE_WITHDRAW;
}
fieldTypes() {
return [
["reserve_pub", EddsaPublicKey],
["amount_with_fee", AmountNbo],
["withdraw_fee", AmountNbo],
["h_denomination_pub", HashCode],
["h_coin_envelope", HashCode],
];
}
}
/**
* Arguments for constructor or [[PaybackRequestPS]].
*/
export interface PaybackRequestPS_args {
coin_pub: EddsaPublicKey;
h_denom_pub: HashCode;
coin_blind: RsaBlindingKeySecret;
}
/**
* Low-level handle to a PaybackRequest signature structure.
*/
export class PaybackRequestPS extends SignatureStruct {
constructor(w: PaybackRequestPS_args) {
super(w);
}
purpose() {
return SignaturePurpose.WALLET_COIN_PAYBACK;
}
fieldTypes() {
return [
["coin_pub", EddsaPublicKey],
["h_denom_pub", HashCode],
["coin_blind", RsaBlindingKeySecret],
];
}
}
/**
* Arguments for constructor of [[RefreshMeltCoinAffirmationPS]].
*/
interface RefreshMeltCoinAffirmationPS_Args {
session_hash: HashCode;
amount_with_fee: AmountNbo;
melt_fee: AmountNbo;
coin_pub: EddsaPublicKey;
}
/**
* Low-level handle to a RefreshMeltCoinAffirmationPS signature structure.
*/
export class RefreshMeltCoinAffirmationPS extends SignatureStruct {
constructor(w: RefreshMeltCoinAffirmationPS_Args) {
super(w);
}
purpose() {
return SignaturePurpose.WALLET_COIN_MELT;
}
fieldTypes() {
return [
["session_hash", HashCode],
["amount_with_fee", AmountNbo],
["melt_fee", AmountNbo],
["coin_pub", EddsaPublicKey],
];
}
}
/**
* Arguments for constructor of [[MasterWireFeePS]].
*/
interface MasterWireFeePS_Args {
/**
* Hash of wire method.
*/
h_wire_method: HashCode;
/**
* Start date.
*/
start_date: AbsoluteTimeNbo;
/**
* End date.
*/
end_date: AbsoluteTimeNbo;
/**
* Wire fee.
*/
wire_fee: AmountNbo;
/**
* Closing fee.
*/
closing_fee: AmountNbo;
}
/**
* Low-level handle to a structure being signed over.
*/
export class MasterWireFeePS extends SignatureStruct {
constructor(w: MasterWireFeePS_Args) {
super(w);
}
purpose() {
return SignaturePurpose.MASTER_WIRE_FEES;
}
fieldTypes() {
return [
["h_wire_method", HashCode],
["start_date", AbsoluteTimeNbo],
["end_date", AbsoluteTimeNbo],
["wire_fee", AmountNbo],
["closing_fee", AmountNbo],
];
}
}
/**
* Low-level handle to an absolute time in network byte order (NBO).
*/
export class AbsoluteTimeNbo extends PackedArenaObject {
static fromTalerString(s: string): AbsoluteTimeNbo {
const x = new AbsoluteTimeNbo();
x.alloc();
const r = /Date\(([0-9]+)\)/;
const m = r.exec(s);
if (!m || m.length !== 2) {
throw Error();
}
const n = parseInt(m[1], 10) * 1000000;
// XXX: This only works up to 54 bit numbers.
set64(x.nativePtr, n);
return x;
}
static fromStampSeconds(stamp: number): AbsoluteTimeNbo {
const x = new AbsoluteTimeNbo();
x.alloc();
// XXX: This only works up to 54 bit numbers.
set64(x.nativePtr, stamp * 1000000);
return x;
}
size() {
return 8;
}
}
// XXX: This only works up to 54 bit numbers.
function set64(p: number, n: number) {
for (let i = 0; i < 8; ++i) {
emsc().lib.setValue(p + (7 - i), n & 0xFF, "i8");
n = Math.floor(n / 256);
}
}
// XXX: This only works up to 54 bit numbers.
function set32(p: number, n: number) {
for (let i = 0; i < 4; ++i) {
emsc().lib.setValue(p + (3 - i), n & 0xFF, "i8");
n = Math.floor(n / 256);
}
}
/**
* Low-level handle to an unsigned 64-bit value.
*/
export class UInt64 extends PackedArenaObject {
static fromNumber(n: number): UInt64 {
const x = new UInt64();
x.alloc();
set64(x.nativePtr, n);
return x;
}
size() {
return 8;
}
}
/**
* Low-level handle to an unsigned 32-bit value.
*/
export class UInt32 extends PackedArenaObject {
static fromNumber(n: number): UInt32 {
const x = new UInt32();
x.alloc();
set32(x.nativePtr, n);
return x;
}
size() {
return 4;
}
}
/**
* Argument to the constructor of [[DepositRequestPS]].
*/
export interface DepositRequestPS_Args {
/**
* Contract hash.
*/
h_contract: HashCode;
/**
* Wire info hash.
*/
h_wire: HashCode;
/**
* Timestamp.
*/
timestamp: AbsoluteTimeNbo;
/**
* Refund deadline.
*/
refund_deadline: AbsoluteTimeNbo;
/**
* Amount with fee.
*/
amount_with_fee: AmountNbo;
/**
* Deposit fee.
*/
deposit_fee: AmountNbo;
/**
* Merchant public key.
*/
merchant: EddsaPublicKey;
/**
* Public key of the coin being deposited.
*/
coin_pub: EddsaPublicKey;
}
/**
* Low-level handle to a struct being signed over.
*/
export class DepositRequestPS extends SignatureStruct {
constructor(w: DepositRequestPS_Args) {
super(w);
}
purpose() {
return SignaturePurpose.WALLET_COIN_DEPOSIT;
}
fieldTypes() {
return [
["h_contract", HashCode],
["h_wire", HashCode],
["timestamp", AbsoluteTimeNbo],
["refund_deadline", AbsoluteTimeNbo],
["amount_with_fee", AmountNbo],
["deposit_fee", AmountNbo],
["merchant", EddsaPublicKey],
["coin_pub", EddsaPublicKey],
];
}
}
/**
* Arguments for constuctor of [[DenominationKeyValidityPS]].
*/
export interface DenominationKeyValidityPS_args {
master: EddsaPublicKey;
start: AbsoluteTimeNbo;
expire_withdraw: AbsoluteTimeNbo;
expire_spend: AbsoluteTimeNbo;
expire_legal: AbsoluteTimeNbo;
value: AmountNbo;
fee_withdraw: AmountNbo;
fee_deposit: AmountNbo;
fee_refresh: AmountNbo;
fee_refund: AmountNbo;
denom_hash: HashCode;
}
/**
* Low-level handle to a structure being signed over.
*/
export class DenominationKeyValidityPS extends SignatureStruct {
constructor(w: DenominationKeyValidityPS_args) {
super(w);
}
purpose() {
return SignaturePurpose.MASTER_DENOMINATION_KEY_VALIDITY;
}
fieldTypes() {
return [
["master", EddsaPublicKey],
["start", AbsoluteTimeNbo],
["expire_withdraw", AbsoluteTimeNbo],
["expire_spend", AbsoluteTimeNbo],
["expire_legal", AbsoluteTimeNbo],
["value", AmountNbo],
["fee_withdraw", AmountNbo],
["fee_deposit", AmountNbo],
["fee_refresh", AmountNbo],
["fee_refund", AmountNbo],
["denom_hash", HashCode],
];
}
}
/**
* Arguments to constructor of [[PaymentSignaturePS]].
*/
export interface PaymentSignaturePS_args {
/**
* Contract hash.
*/
contract_hash: HashCode;
}
/**
* Low-level handle to a structure being signed over.
*/
export class PaymentSignaturePS extends SignatureStruct {
constructor(w: PaymentSignaturePS_args) {
super(w);
}
purpose() {
return SignaturePurpose.MERCHANT_PAYMENT_OK;
}
fieldTypes() {
return [
["contract_hash", HashCode],
];
}
}
/**
* Low-level handle to an RsaPublicKey.
*/
export class RsaPublicKey extends MallocArenaObject {
static fromCrock(s: string): RsaPublicKey {
return fromCrockDecoded(s, this, emsc().allocFuncs.rsa_public_key_decode);
}
toCrock() {
return this.encode().toCrock();
}
destroy() {
emsc().funcs.rsa_public_key_free(this.nativePtr);
this.nativePtr = 0;
}
encode(arena?: Arena): ByteArray {
return encode(this, emsc().allocFuncs.rsa_public_key_encode);
}
}
/**
* Low-level handle to an EddsaSignature.
*/
export class EddsaSignature extends PackedArenaObject {
size() {
return 64;
}
static fromCrock(s: string): EddsaSignature {
return fromCrock(s, this);
}
}
/**
* Low-level handle to an RsaSignature.
*/
export class RsaSignature extends MallocArenaObject {
static fromCrock(s: string, a?: Arena) {
return fromCrockDecoded(s, this, emsc().allocFuncs.rsa_signature_decode);
}
encode(arena?: Arena): ByteArray {
return encode(this, emsc().allocFuncs.rsa_signature_encode);
}
destroy() {
emsc().funcs.rsa_signature_free(this.nativePtr);
this.nativePtr = 0;
}
}
/**
* Blind a value so it can be blindly signed.
*/
export function rsaBlind(hashCode: HashCode,
blindingKey: RsaBlindingKeySecret,
pkey: RsaPublicKey,
arena?: Arena): ByteArray|null {
const buf_ptr_out = emsc().allocFuncs.malloc(PTR_SIZE);
const buf_size_out = emsc().allocFuncs.malloc(PTR_SIZE);
const res = emsc().allocFuncs.rsa_blind(hashCode.nativePtr,
blindingKey.nativePtr,
pkey.nativePtr,
buf_ptr_out,
buf_size_out);
const buf_ptr = emsc().lib.getValue(buf_ptr_out, "*");
const buf_size = emsc().lib.getValue(buf_size_out, "*");
emsc().funcs.free(buf_ptr_out);
emsc().funcs.free(buf_size_out);
if (res !== GNUNET_OK) {
// malicious key
return null;
}
return new ByteArray(buf_size, buf_ptr, arena);
}
/**
* Sign data using EdDSA.
*/
export function eddsaSign(purpose: EccSignaturePurpose,
priv: EddsaPrivateKey,
a?: Arena): EddsaSignature {
const sig = new EddsaSignature(a);
sig.alloc();
const res = emsc().funcs.eddsa_sign(priv.nativePtr, purpose.nativePtr, sig.nativePtr);
if (res < 1) {
throw Error("EdDSA signing failed");
}
return sig;
}
/**
* Verify EdDSA-signed data.
*/
export function eddsaVerify(purposeNum: number,
verify: EccSignaturePurpose,
sig: EddsaSignature,
pub: EddsaPublicKey,
a?: Arena): boolean {
const r = emsc().funcs.eddsa_verify(purposeNum,
verify.nativePtr,
sig.nativePtr,
pub.nativePtr);
return r === GNUNET_OK;
}
/**
* Unblind a blindly signed value.
*/
export function rsaUnblind(sig: RsaSignature,
bk: RsaBlindingKeySecret,
pk: RsaPublicKey,
a?: Arena): RsaSignature {
const x = new RsaSignature(a);
x.nativePtr = emsc().allocFuncs.rsa_unblind(sig.nativePtr,
bk.nativePtr,
pk.nativePtr);
return x;
}
type TransferSecretP = HashCode;
/**
* A fresh coin generated from a sed.
*/
export interface FreshCoin {
/**
* The coin's private key.
*/
priv: EddsaPrivateKey;
/**
* The blinding key to use for withdrawal.
*/
blindingKey: RsaBlindingKeySecret;
}
/**
* Diffie-Hellman operation between an ECDHE private key
* and an EdDSA public key.
*/
export function ecdhEddsa(priv: EcdhePrivateKey,
pub: EddsaPublicKey): HashCode {
const h = new HashCode();
h.alloc();
const res = emsc().funcs.ecdh_eddsa(priv.nativePtr, pub.nativePtr, h.nativePtr);
if (res !== GNUNET_OK) {
throw Error("ecdh_eddsa failed");
}
return h;
}
/**
* Derive a fresh coin from the given seed. Used during refreshing.
*/
export function setupFreshCoin(secretSeed: TransferSecretP,
coinIndex: number): FreshCoin {
const priv = new EddsaPrivateKey();
priv.isWeak = true;
const blindingKey = new RsaBlindingKeySecret();
blindingKey.isWeak = true;
const buf = new ByteArray(priv.size() + blindingKey.size());
emsc().funcs.setup_fresh_coin(secretSeed.nativePtr, coinIndex, buf.nativePtr);
priv.nativePtr = buf.nativePtr;
blindingKey.nativePtr = buf.nativePtr + priv.size();
return { priv, blindingKey };
}
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