feat: add utils for verifying 6492 sigs and ensip-11 utils

packages/core/src/ens/utils.ts

@@ -0,0 +1,36 @@
+import * as chains from "viem/chains";
+import { mainnet, type Chain } from "viem/chains";
+
+export const ChainsById: Map<number, chains.Chain> = new Map(
+  Object.values(chains).map((x) => [x.id, x])
+);
+
+export const convertChainIdToCoinType = (chainId: number): number => {
+  if (chainId === mainnet.id) {
+    // this comes from [ensip-9](https://docs.ens.domains/ens-improvement-proposals/ensip-9-multichain-address-resolution)
+    return 60;
+  }
+
+  // this is using [ENSIP-11](https://docs.ens.domains/ens-improvement-proposals/ensip-11-evmchain-address-resolution) and assumes this is how mappings are stored for non mainnet chains
+  return (0x80000000 | chainId) >>> 0;
+};
+
+export const convertCoinTypeToChainId = (coinType: number): number => {
+  if (coinType === 60) {
+    // this comes from [ensip-9](https://docs.ens.domains/ens-improvement-proposals/ensip-9-multichain-address-resolution)
+    return mainnet.id;
+  }
+
+  // this is using [ENSIP-11](https://docs.ens.domains/ens-improvement-proposals/ensip-11-evmchain-address-resolution) and assumes this is how mappings are stored for non mainnet chains
+  return (0x7fffffff & coinType) >> 0;
+};
+
+export const convertCoinTypeToChain = (coinType: number): Chain => {
+  const chainId = convertCoinTypeToChainId(coinType);
+  const chain = ChainsById.get(chainId);
+  if (!chain) {
+    throw new Error("CoinType does not map to a supported chain");
+  }
+
+  return chain;
+};

packages/core/src/index.ts

@@ -18,14 +18,20 @@ export { HdAccountSigner } from "./signer/hd-account.js";
 export { LocalAccountSigner } from "./signer/local-account.js";
 export { PrivateKeySigner } from "./signer/private-key.js";
 export type { SmartAccountSigner } from "./signer/types.js";
-export { wrapWith6492 } from "./signer/utils.js";
+export { verifyEIP6492Signature, wrapWith6492 } from "./signer/utils.js";
 
 export {
   createPublicErc4337Client,
   createPublicErc4337FromClient,
 } from "./client/create-client.js";
 export type * from "./client/types.js";
 
+export {
+  convertChainIdToCoinType,
+  convertCoinTypeToChain,
+  convertCoinTypeToChainId,
+} from "./ens/utils.js";
+
 export { SmartAccountProvider, noOpMiddleware } from "./provider/base.js";
 export type {
   ConnectedSmartAccountProvider,

packages/core/src/signer/utils.ts

@@ -5,6 +5,7 @@ import {
   type Address,
   type Hash,
   type Hex,
+  type PublicClient,
 } from "viem";
 
 type SignWith6492Params = {
@@ -27,3 +28,32 @@ export const wrapWith6492 = ({
     "0x6492649264926492649264926492649264926492649264926492649264926492",
   ]);
 };
+
+// defined in https://github.com/AmbireTech/signature-validator/blob/main/index.ts#L13C17-L13C17
+const universalValidatorByteCode =
+  "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";
+
+export const verifyEIP6492Signature = async ({
+  signer,
+  hash,
+  signature,
+  client,
+}: {
+  signer: Address;
+  hash: Hash;
+  signature: Hash;
+  client: PublicClient;
+}): Promise<boolean> => {
+  const result = await client.call({
+    data: concat([
+      universalValidatorByteCode,
+      encodeAbiParameters(parseAbiParameters("address, bytes32, bytes"), [
+        signer,
+        hash,
+        signature,
+      ]),
+    ]),
+  });
+
+  return result.data === "0x01";
+};