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/*
This file is part of TALER
(C) 2016 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/>
*/
/**
* Web worker for crypto operations.
* @author Florian Dold
*/
"use strict";
import * as native from "./emscriptif";
import {PreCoin, Reserve, PayCoinInfo} from "./types";
import create = chrome.alarms.create;
import {Offer} from "./wallet";
import {CoinWithDenom} from "./wallet";
import {CoinPaySig} from "./types";
import {Denomination} from "./types";
import {Amount} from "./emscriptif";
export function main(worker: Worker) {
worker.onmessage = (msg: MessageEvent) => {
if (!Array.isArray(msg.data.args)) {
console.error("args must be array");
return;
}
if (typeof msg.data.id != "number") {
console.error("RPC id must be number");
}
if (typeof msg.data.operation != "string") {
console.error("RPC operation must be string");
}
let f = (RpcFunctions as any)[msg.data.operation];
if (!f) {
console.error(`unknown operation: '${msg.data.operation}'`);
return;
}
let res = f(...msg.data.args);
worker.postMessage({result: res, id: msg.data.id});
}
}
namespace RpcFunctions {
/**
* Create a pre-coin of the given denomination to be withdrawn from then given
* reserve.
*/
export function createPreCoin(denom: Denomination,
reserve: Reserve): PreCoin {
let reservePriv = new native.EddsaPrivateKey();
reservePriv.loadCrock(reserve.reserve_priv);
let reservePub = new native.EddsaPublicKey();
reservePub.loadCrock(reserve.reserve_pub);
let denomPub = native.RsaPublicKey.fromCrock(denom.denom_pub);
let coinPriv = native.EddsaPrivateKey.create();
let coinPub = coinPriv.getPublicKey();
let blindingFactor = native.RsaBlindingKeySecret.create();
let pubHash: native.HashCode = coinPub.hash();
let ev: native.ByteArray = native.rsaBlind(pubHash,
blindingFactor,
denomPub);
if (!denom.fee_withdraw) {
throw Error("Field fee_withdraw missing");
}
let amountWithFee = new native.Amount(denom.value);
amountWithFee.add(new native.Amount(denom.fee_withdraw));
let withdrawFee = new native.Amount(denom.fee_withdraw);
// Signature
let withdrawRequest = new native.WithdrawRequestPS({
reserve_pub: reservePub,
amount_with_fee: amountWithFee.toNbo(),
withdraw_fee: withdrawFee.toNbo(),
h_denomination_pub: denomPub.encode().hash(),
h_coin_envelope: ev.hash()
});
var sig = native.eddsaSign(withdrawRequest.toPurpose(), reservePriv);
let preCoin: PreCoin = {
reservePub: reservePub.toCrock(),
blindingKey: blindingFactor.toCrock(),
coinPub: coinPub.toCrock(),
coinPriv: coinPriv.toCrock(),
denomPub: denomPub.encode().toCrock(),
exchangeBaseUrl: reserve.exchange_base_url,
withdrawSig: sig.toCrock(),
coinEv: ev.toCrock(),
coinValue: denom.value
};
return preCoin;
}
export function isValidDenom(denom: Denomination,
masterPub: string): boolean {
let p = new native.DenominationKeyValidityPS({
master: native.EddsaPublicKey.fromCrock(masterPub),
denom_hash: native.RsaPublicKey.fromCrock(denom.denom_pub)
.encode()
.hash(),
expire_legal: native.AbsoluteTimeNbo.fromTalerString(denom.stamp_expire_legal),
expire_spend: native.AbsoluteTimeNbo.fromTalerString(denom.stamp_expire_deposit),
expire_withdraw: native.AbsoluteTimeNbo.fromTalerString(denom.stamp_expire_withdraw),
start: native.AbsoluteTimeNbo.fromTalerString(denom.stamp_start),
value: (new native.Amount(denom.value)).toNbo(),
fee_deposit: (new native.Amount(denom.fee_deposit)).toNbo(),
fee_refresh: (new native.Amount(denom.fee_refresh)).toNbo(),
fee_withdraw: (new native.Amount(denom.fee_withdraw)).toNbo(),
fee_refund: (new native.Amount(denom.fee_refund)).toNbo(),
});
let nativeSig = new native.EddsaSignature();
nativeSig.loadCrock(denom.master_sig);
let nativePub = native.EddsaPublicKey.fromCrock(masterPub);
return native.eddsaVerify(native.SignaturePurpose.MASTER_DENOMINATION_KEY_VALIDITY,
p.toPurpose(),
nativeSig,
nativePub);
}
export function hashString(str: string): string {
const b = native.ByteArray.fromString(str);
return b.hash().toCrock();
}
export function hashRsaPub(rsaPub: string): string {
return native.RsaPublicKey.fromCrock(rsaPub)
.encode()
.hash()
.toCrock();
}
export function createEddsaKeypair(): {priv: string, pub: string} {
const priv = native.EddsaPrivateKey.create();
const pub = priv.getPublicKey();
return {priv: priv.toCrock(), pub: pub.toCrock()};
}
export function rsaUnblind(sig: string, bk: string, pk: string): string {
let denomSig = native.rsaUnblind(native.RsaSignature.fromCrock(sig),
native.RsaBlindingKeySecret.fromCrock(bk),
native.RsaPublicKey.fromCrock(pk));
return denomSig.encode().toCrock()
}
/**
* Generate updated coins (to store in the database)
* and deposit permissions for each given coin.
*/
export function signDeposit(offer: Offer,
cds: CoinWithDenom[]): PayCoinInfo {
let ret: PayCoinInfo = [];
let amountSpent = native.Amount.getZero(cds[0].coin.currentAmount.currency);
let amountRemaining = new native.Amount(offer.contract.amount);
for (let cd of cds) {
let coinSpend: Amount;
if (amountRemaining.value == 0 && amountRemaining.fraction == 0) {
break;
}
if (amountRemaining.cmp(new native.Amount(cd.coin.currentAmount)) < 0) {
coinSpend = new native.Amount(amountRemaining.toJson());
} else {
coinSpend = new native.Amount(cd.coin.currentAmount);
}
amountSpent.add(coinSpend);
amountRemaining.sub(coinSpend);
let newAmount = new native.Amount(cd.coin.currentAmount);
newAmount.sub(coinSpend);
cd.coin.currentAmount = newAmount.toJson();
let d = new native.DepositRequestPS({
h_contract: native.HashCode.fromCrock(offer.H_contract),
h_wire: native.HashCode.fromCrock(offer.contract.H_wire),
amount_with_fee: coinSpend.toNbo(),
coin_pub: native.EddsaPublicKey.fromCrock(cd.coin.coinPub),
deposit_fee: new native.Amount(cd.denom.fee_deposit).toNbo(),
merchant: native.EddsaPublicKey.fromCrock(offer.contract.merchant_pub),
refund_deadline: native.AbsoluteTimeNbo.fromTalerString(offer.contract.refund_deadline),
timestamp: native.AbsoluteTimeNbo.fromTalerString(offer.contract.timestamp),
transaction_id: native.UInt64.fromNumber(offer.contract.transaction_id),
});
let coinSig = native.eddsaSign(d.toPurpose(),
native.EddsaPrivateKey.fromCrock(cd.coin.coinPriv))
.toCrock();
let s: CoinPaySig = {
coin_sig: coinSig,
coin_pub: cd.coin.coinPub,
ub_sig: cd.coin.denomSig,
denom_pub: cd.coin.denomPub,
f: coinSpend.toJson(),
};
ret.push({sig: s, updatedCoin: cd.coin});
}
return ret;
}
}
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