Added verifyTypedData utility (reported on Farcaster).

src.ts/ethers.ts

@@ -51,7 +51,8 @@ export {
     ensNormalize, isValidName, namehash, dnsEncode,
     hashMessage, verifyMessage,
     solidityPacked, solidityPackedKeccak256, solidityPackedSha256,
-    TypedDataEncoder
+    TypedDataEncoder,
+    verifyTypedData
 } from "./hash/index.js";
 
 export {
@@ -149,7 +150,8 @@ export type {
     ConstantContractMethod, ContractEvent, ContractEventArgs, ContractEventName,
     ContractInterface, ContractMethod, ContractMethodArgs, ContractTransaction,
     DeferredTopicFilter, Overrides,
-    BaseContractMethod, ContractDeployTransaction, PostfixOverrides
+    BaseContractMethod, ContractDeployTransaction, PostfixOverrides,
+    WrappedFallback
 } from "./contract/index.js";
 
 export type { ProgressCallback, SignatureLike } from "./crypto/index.js";

src.ts/hash/index.ts

@@ -10,6 +10,6 @@ export { hashMessage, verifyMessage } from "./message.js";
 export {
     solidityPacked, solidityPackedKeccak256, solidityPackedSha256
 } from "./solidity.js";
-export { TypedDataEncoder } from "./typed-data.js";
+export { TypedDataEncoder, verifyTypedData } from "./typed-data.js";
 
 export type { TypedDataDomain, TypedDataField } from "./typed-data.js";

src.ts/hash/typed-data.ts

@@ -1,6 +1,7 @@
 //import { TypedDataDomain, TypedDataField } from "@ethersproject/providerabstract-signer";
 import { getAddress } from "../address/index.js";
 import { keccak256 } from "../crypto/index.js";
+import { recoverAddress } from "../transaction/index.js";
 import {
     concat, defineProperties, getBigInt, getBytes, hexlify, isHexString, mask, toBeHex, toTwos, zeroPadValue,
     assertArgument
@@ -8,6 +9,7 @@ import {
 
 import { id } from "./id.js";
 
+import type { SignatureLike } from "../crypto/index.js";
 import type { BigNumberish, BytesLike } from "../utils/index.js";
 
 
@@ -487,3 +489,9 @@ export class TypedDataEncoder {
     }
 }
 
+/**
+ *  Compute the address used to sign the typed data for the %%signature%%.
+ */
+export function verifyTypedData(domain: TypedDataDomain, types: Record<string, Array<TypedDataField>>, value: Record<string, any>, signature: SignatureLike): string {
+    return recoverAddress(TypedDataEncoder.hash(domain, types, value), signature);
+}