address protocol changes in the exchange

The exchange now has a wad fee and truncates the payto hash in signatures

packages/taler-util/src/backupTypes.ts

@@ -1023,6 +1023,8 @@ export interface BackupExchangeWireFee {
    */
   wire_fee: string;
 
+  wad_fee: string;
+
   /**
    * Fees to close and refund a reserve.
    */

packages/taler-util/src/talerCrypto.ts

@@ -25,6 +25,7 @@ import * as nacl from "./nacl-fast.js";
 import { kdf, kdfKw } from "./kdf.js";
 import bigint from "big-integer";
 import {
+  Base32String,
   CoinEnvelope,
   DenominationPubKey,
   DenomKeyType,
@@ -598,6 +599,15 @@ export function hash(d: Uint8Array): Uint8Array {
   return nacl.hash(d);
 }
 
+/**
+ * Hash the input with SHA-512 and truncate the result
+ * to 32 bytes.
+ */
+export function hashTruncate32(d: Uint8Array): Uint8Array {
+  const sha512HashCode = nacl.hash(d);
+  return sha512HashCode.subarray(0, 32);
+}
+
 export function hashCoinEv(
   coinEv: CoinEnvelope,
   denomPubHash: HashCodeString,
@@ -608,7 +618,6 @@ export function hashCoinEv(
   return hashContext.finish();
 }
 
-
 const logger = new Logger("talerCrypto.ts");
 
 export function hashCoinEvInner(
@@ -683,7 +692,6 @@ export interface FreshCoin {
   bks: Uint8Array;
 }
 
-
 function bufferForUint32(n: number): Uint8Array {
   const arrBuf = new ArrayBuffer(4);
   const buf = new Uint8Array(arrBuf);

packages/taler-util/src/talerTypes.ts

@@ -738,6 +738,8 @@ export class WireFeesJson {
    */
   wire_fee: string;
 
+  wad_fee: string;
+
   /**
    * Cost of clising a reserve.
    */
@@ -1356,6 +1358,7 @@ export const codecForWireFeesJson = (): Codec<WireFeesJson> =>
   buildCodecForObject<WireFeesJson>()
     .property("wire_fee", codecForString())
     .property("closing_fee", codecForString())
+    .property("wad_fee", codecForString())
     .property("sig", codecForString())
     .property("start_date", codecForTimestamp)
     .property("end_date", codecForTimestamp)

packages/taler-wallet-cli/src/harness/harness.ts

@@ -1443,6 +1443,7 @@ export class ExchangeService implements ExchangeServiceInterface {
             accTargetType,
             `${this.exchangeConfig.currency}:0.01`,
             `${this.exchangeConfig.currency}:0.01`,
+            `${this.exchangeConfig.currency}:0.01`,
             "upload",
           ],
         );

packages/taler-wallet-core/src/crypto/workers/cryptoImplementation.ts

@@ -48,6 +48,7 @@ import {
   hashCoinEv,
   hashCoinEvInner,
   hashDenomPub,
+  hashTruncate32,
   keyExchangeEcdheEddsa,
   Logger,
   MakeSyncSignatureRequest,
@@ -329,6 +330,7 @@ export class CryptoImplementation {
       .put(timestampRoundedToBuffer(wf.endStamp))
       .put(amountToBuffer(wf.wireFee))
       .put(amountToBuffer(wf.closingFee))
+      .put(amountToBuffer(wf.wadFee))
       .build();
     const sig = decodeCrock(wf.sig);
     const pub = decodeCrock(masterPub);
@@ -376,7 +378,7 @@ export class CryptoImplementation {
     sig: string,
     masterPub: string,
   ): boolean {
-    const paytoHash = hash(stringToBytes(paytoUri + "\0"));
+    const paytoHash = hashTruncate32(stringToBytes(paytoUri + "\0"));
     const p = buildSigPS(TalerSignaturePurpose.MASTER_WIRE_DETAILS)
       .put(paytoHash)
       .build();

packages/taler-wallet-core/src/db.ts

@@ -1026,6 +1026,11 @@ export interface WireFee {
    */
   closingFee: AmountJson;
 
+  /**
+   * Fees for inter-exchange transfers from P2P payments.
+   */
+  wadFee: AmountJson;
+
   /**
    * Start date of the fee.
    */

packages/taler-wallet-core/src/operations/backup/export.ts

@@ -113,9 +113,8 @@ export async function exportBackup(
       } = {};
 
       await tx.withdrawalGroups.iter().forEachAsync(async (wg) => {
-        const withdrawalGroups = (withdrawalGroupsByReserve[
-          wg.reservePub
-        ] ??= []);
+        const withdrawalGroups = (withdrawalGroupsByReserve[wg.reservePub] ??=
+          []);
         withdrawalGroups.push({
           raw_withdrawal_amount: Amounts.stringify(wg.rawWithdrawalAmount),
           selected_denoms: wg.denomsSel.selectedDenoms.map((x) => ({
@@ -288,6 +287,7 @@ export async function exportBackup(
             wireFees.push({
               wire_type: x,
               closing_fee: Amounts.stringify(f.closingFee),
+              wad_fee: Amounts.stringify(f.wadFee),
               end_stamp: f.endStamp,
               sig: f.sig,
               start_stamp: f.startStamp,

packages/taler-wallet-core/src/operations/backup/import.ts

@@ -305,6 +305,7 @@ export async function importBackup(
               sig: fee.sig,
               startStamp: fee.start_stamp,
               wireFee: Amounts.parseOrThrow(fee.wire_fee),
+              wadFee: Amounts.parseOrThrow(fee.wad_fee),
             });
           }
           await tx.exchangeDetails.put({

packages/taler-wallet-core/src/operations/exchanges.ts

@@ -266,6 +266,7 @@ async function validateWireInfo(
         sig: x.sig,
         startStamp,
         wireFee: Amounts.parseOrThrow(x.wire_fee),
+        wadFee: Amounts.parseOrThrow(x.wad_fee),
       };
       let isValid = false;
       if (ws.insecureTrustExchange) {
@@ -451,7 +452,8 @@ export async function downloadTosFromAcceptedFormat(
   ws: InternalWalletState,
   baseUrl: string,
   timeout: Duration,
-  acceptedFormat?: string[]): Promise<ExchangeTosDownloadResult> {
+  acceptedFormat?: string[],
+): Promise<ExchangeTosDownloadResult> {
   let tosFound: ExchangeTosDownloadResult | undefined;
   //Remove this when exchange supports multiple content-type in accept header
   if (acceptedFormat)
@@ -467,7 +469,7 @@ export async function downloadTosFromAcceptedFormat(
         break;
       }
     }
-  if (tosFound !== undefined) return tosFound
+  if (tosFound !== undefined) return tosFound;
   // If none of the specified format was found try text/plain
   return await downloadExchangeWithTermsOfService(
     baseUrl,
@@ -550,8 +552,12 @@ async function updateExchangeFromUrlImpl(
 
   logger.info("finished validating exchange /wire info");
 
-
-  const tosDownload = await downloadTosFromAcceptedFormat(ws, baseUrl, timeout, acceptedFormat)
+  const tosDownload = await downloadTosFromAcceptedFormat(
+    ws,
+    baseUrl,
+    timeout,
+    acceptedFormat,
+  );
 
   let recoupGroupId: string | undefined;