Added verifyMessage helper.

src.ts/ethers.ts

@@ -49,7 +49,7 @@ export {
 export {
     id,
     isValidName, namehash, dnsEncode,
-    hashMessage,
+    hashMessage, verifyMessage,
     solidityPacked, solidityPackedKeccak256, solidityPackedSha256,
     TypedDataEncoder
 } from "./hash/index.js";
@@ -59,6 +59,8 @@ export {
 
     Block, FeeData, Log, TransactionReceipt, TransactionResponse,
 
+    AbstractSigner, VoidSigner,
+
     AbstractProvider,
 
     FallbackProvider,

src.ts/hash/index.ts

@@ -6,7 +6,7 @@
 
 export { id } from "./id.js"
 export { isValidName, namehash, dnsEncode } from "./namehash.js";
-export { hashMessage } from "./message.js";
+export { hashMessage, verifyMessage } from "./message.js";
 export {
     solidityPacked, solidityPackedKeccak256, solidityPackedSha256
 } from "./solidity.js";

src.ts/hash/message.ts

@@ -1,7 +1,9 @@
 import { keccak256 } from "../crypto/index.js";
 import { MessagePrefix } from "../constants/index.js";
+import { recoverAddress } from "../transaction/index.js";
 import { concat, toUtf8Bytes } from "../utils/index.js";
 
+import type { SignatureLike } from "../crypto/index.js";
 /**
  *  Computes the [[link-eip-191]] personal-sign message digest to sign.
  *
@@ -38,3 +40,8 @@ export function hashMessage(message: Uint8Array | string): string {
         message
     ]));
 }
+
+export function verifyMessage(message: Uint8Array | string, sig: SignatureLike): string {
+    const digest = hashMessage(message);
+    return recoverAddress(digest, sig);
+}