1 files changed, 16 insertions, 0 deletions
diff --git a/packages/taler-util/src/taler-crypto.ts b/packages/taler-util/src/taler-crypto.ts
index db64efcf2..fa92f5683 100644
--- a/packages/taler-util/src/taler-crypto.ts
+++ b/packages/taler-util/src/taler-crypto.ts
@@ -868,6 +868,21 @@ export function bufferForUint32(n: number): Uint8Array {
   return buf;
 }
 
+/**
+ * This makes the assumption that the uint64 fits a float,
+ * which should be true for all Taler protocol messages.
+ */
+export function bufferForUint64(n: number): Uint8Array {
+  const arrBuf = new ArrayBuffer(4);
+  const buf = new Uint8Array(arrBuf);
+  const dv = new DataView(arrBuf);
+  if (n < 0 || !Number.isInteger(n)) {
+    throw Error("non-negative integer expected");
+  }
+  dv.setBigUint64(0, BigInt(n));
+  return buf;
+}
+
 export function bufferForUint8(n: number): Uint8Array {
   const arrBuf = new ArrayBuffer(1);
   const buf = new Uint8Array(arrBuf);
@@ -933,6 +948,7 @@ export enum TalerSignaturePurpose {
   TEST = 4242,
   MERCHANT_PAYMENT_OK = 1104,
   MERCHANT_CONTRACT = 1101,
+  MERCHANT_REFUND = 1102,
   WALLET_COIN_RECOUP = 1203,
   WALLET_COIN_LINK = 1204,
   WALLET_COIN_RECOUP_REFRESH = 1206,