move amount and time function to util

1 files changed, 61 insertions, 0 deletions

diff --git a/packages/taler-util/src/taler-crypto.ts b/packages/taler-util/src/taler-crypto.ts
index dd8d7dd7b..e3f7d49a8 100644
--- a/packages/taler-util/src/taler-crypto.ts
+++ b/packages/taler-util/src/taler-crypto.ts
@@ -35,6 +35,8 @@ import { Logger } from "./logging.js";
 import { secretbox } from "./nacl-fast.js";
 import * as fflate from "fflate";
 import { canonicalJson } from "./helpers.js";
+import { TalerProtocolDuration, TalerProtocolTimestamp } from "./time.js";
+import { AmountLike, Amounts } from "./amounts.js";
 
 export type Flavor<T, FlavorT extends string> = T & {
   _flavor?: `taler.${FlavorT}`;
@@ -963,6 +965,7 @@ export enum TalerSignaturePurpose {
   EXCHANGE_CONFIRM_RECOUP_REFRESH = 1041,
   TALER_SIGNATURE_AML_DECISION = 1350,
   TALER_SIGNATURE_AML_QUERY = 1351,
+  TALER_SIGNATURE_MASTER_AML_KEY = 1017,
   ANASTASIS_POLICY_UPLOAD = 1400,
   ANASTASIS_POLICY_DOWNLOAD = 1401,
   SYNC_BACKUP_UPLOAD = 1450,
@@ -1546,3 +1549,61 @@ export async function decryptContractForDeposit(
     contractTerms: JSON.parse(contractTermsString),
   };
 }
+
+export function amountToBuffer(amount: AmountLike): Uint8Array {
+  const amountJ = Amounts.jsonifyAmount(amount);
+  const buffer = new ArrayBuffer(8 + 4 + 12);
+  const dvbuf = new DataView(buffer);
+  const u8buf = new Uint8Array(buffer);
+  const curr = stringToBytes(amountJ.currency);
+  if (typeof dvbuf.setBigUint64 !== "undefined") {
+    dvbuf.setBigUint64(0, BigInt(amountJ.value));
+  } else {
+    const arr = bigint(amountJ.value).toArray(2 ** 8).value;
+    let offset = 8 - arr.length;
+    for (let i = 0; i < arr.length; i++) {
+      dvbuf.setUint8(offset++, arr[i]);
+    }
+  }
+  dvbuf.setUint32(8, amountJ.fraction);
+  u8buf.set(curr, 8 + 4);
+
+  return u8buf;
+}
+
+export function timestampRoundedToBuffer(ts: TalerProtocolTimestamp): Uint8Array {
+  const b = new ArrayBuffer(8);
+  const v = new DataView(b);
+  // The buffer we sign over represents the timestamp in microseconds.
+  if (typeof v.setBigUint64 !== "undefined") {
+    const s = BigInt(ts.t_s) * BigInt(1000 * 1000);
+    v.setBigUint64(0, s);
+  } else {
+    const s =
+      ts.t_s === "never" ? bigint.zero : bigint(ts.t_s).multiply(1000 * 1000);
+    const arr = s.toArray(2 ** 8).value;
+    let offset = 8 - arr.length;
+    for (let i = 0; i < arr.length; i++) {
+      v.setUint8(offset++, arr[i]);
+    }
+  }
+  return new Uint8Array(b);
+}
+
+export function durationRoundedToBuffer(ts: TalerProtocolDuration): Uint8Array {
+  const b = new ArrayBuffer(8);
+  const v = new DataView(b);
+  // The buffer we sign over represents the timestamp in microseconds.
+  if (typeof v.setBigUint64 !== "undefined") {
+    const s = BigInt(ts.d_us);
+    v.setBigUint64(0, s);
+  } else {
+    const s = ts.d_us === "forever" ? bigint.zero : bigint(ts.d_us);
+    const arr = s.toArray(2 ** 8).value;
+    let offset = 8 - arr.length;
+    for (let i = 0; i < arr.length; i++) {
+      v.setUint8(offset++, arr[i]);
+    }
+  }
+  return new Uint8Array(b);
+}