Merge pull request #1989 from Web3Auth/fix/strip0x

fix: strip 0x from the unsignned data

packages/providers/ethereum-mpc-provider/src/providers/signingProviders/signingUtils.ts

@@ -12,7 +12,7 @@ import {
   TypedMessageParams,
   validateTypedSignMessageDataV4,
 } from "@web3auth/ethereum-provider";
-import { hashMessage, TypedDataEncoder } from "ethers";
+import { hashMessage, Signature, TypedDataEncoder } from "ethers";
 
 async function signTx(
   txParams: TransactionParams & { gas?: string },
@@ -25,8 +25,8 @@ async function signTx(
     ...finalTxParams,
     from: undefined, // from is already calculated inside Transaction.from and is not allowed to be passed in
   });
-
-  const vrs = await sign(Buffer.from(ethTx.unsignedHash));
+  const msgHash = stripHexPrefix(ethTx.unsignedHash);
+  const vrs = await sign(Buffer.from(msgHash, "hex"));
   let { v } = vrs;
   const { r, s } = vrs;
 
@@ -37,9 +37,7 @@ async function signTx(
 
   // addSignature will handle the v value
   const tx = ethTx;
-  tx.signature.v = BigInt(v);
-  tx.signature.r = r;
-  tx.signature.s = s;
+  tx.signature = Signature.from({ v, r: `0x${r.toString("hex")}`, s: `0x${s.toString("hex")}` });
 
   return tx.serialized as PrefixedHexString;
 }