fix biginttobytes

Author: chaitanyapotti

src/Point.ts

@@ -1,8 +1,8 @@
 import { ed25519 } from "@noble/curves/ed25519.js";
 import { secp256k1 } from "@noble/curves/secp256k1.js";
-import { concatBytes, hexToBytes } from "@noble/curves/utils.js";
+import { concatBytes, hexToBytes, numberToBytesBE } from "@noble/curves/utils.js";
 
-import { bigintToHex, toBigIntBE } from "./helpers/common";
+import { toBigIntBE } from "./helpers/common";
 import { BigIntString, KeyType } from "./interfaces";
 
 class Point {
@@ -21,7 +21,7 @@ class Point {
   encode(enc: string): Uint8Array {
     switch (enc) {
       case "arr":
-        return concatBytes(hexToBytes("04"), hexToBytes(bigintToHex(this.x)), hexToBytes(bigintToHex(this.y)));
+        return concatBytes(hexToBytes("04"), numberToBytesBE(this.x, 32), numberToBytesBE(this.y, 32));
       case "elliptic-compressed": {
         if (this.keyType === "secp256k1") {
           const point = secp256k1.Point.fromAffine({ x: this.x, y: this.y });

src/helpers/metadataUtils.ts

@@ -96,7 +96,7 @@ export function generateMetadataParams(ecCurve: Curve, serverTimeOffset: number,
   };
   const msgHash = keccak256Bytes(utf8ToBytes(stringify(setData)));
   // metadata only uses secp for sig validation; prehash: false because msgHash is already hashed
-  const sig = secp256k1.sign(msgHash, hexToBytes(bigintToHex(privateKey)), { prehash: false });
+  const sig = secp256k1.sign(msgHash, numberToBytesBE(privateKey, 32), { prehash: false });
   const pubKey = derivePubKey(ecCurve, privateKey);
   return {
     pub_key_X: pubKey.x.toString(16), // DO NOT PAD THIS. BACKEND DOESN'T
@@ -148,7 +148,7 @@ export function generateNonceMetadataParams(
   }
 
   const msgHash = keccak256Bytes(utf8ToBytes(stringify(setData)));
-  const sig = secp256k1.sign(msgHash, hexToBytes(bigintToHex(privateKey)), { prehash: false });
+  const sig = secp256k1.sign(msgHash, numberToBytesBE(privateKey, 32), { prehash: false });
   const pubKey = derivePubKey(secp256k1, privateKey);
   return {
     pub_key_X: bigintToHex(pubKey.x),
@@ -259,7 +259,7 @@ export async function getOrSetSapphireMetadataNonce(
       timestamp: (~~(serverTimeOffset + Date.now() / 1000)).toString(16),
     };
     const msgHash = keccak256Bytes(utf8ToBytes(stringify(setData)));
-    const sig = secp256k1.sign(msgHash, hexToBytes(bigintToHex(privKey)), { prehash: false });
+    const sig = secp256k1.sign(msgHash, numberToBytesBE(privKey, 32), { prehash: false });
     const pubKey = derivePubKey(secp256k1, privKey);
     data = {
       ...data,