verify signatures

Author: aramikm

js/ethereum-utils/src/signature.ts

@@ -51,6 +51,25 @@ export async function signEip712(
   return { Ecdsa: signature } as EcdsaSignature;
 }
 
+/**
+ * Verify EIP-712 signatures
+ * @param ethereumAddress
+ * @param signature
+ * @param payload
+ */
+export function verifyEip712Signature(
+  ethereumAddress: HexString,
+  signature: HexString,
+  payload: SupportedPayload
+): boolean {
+  const types = getTypesFor(payload.type);
+  const normalizedPayload = normalizePayload(payload);
+  // TODO: use correct chainID for different networks
+  // TODO: use correct contract address for different payloads
+  const recoveredAddress = ethers.verifyTypedData(EIP712_DOMAIN_DEFAULT, types, normalizedPayload, signature);
+  return recoveredAddress.toLowerCase() === ethereumAddress.toLowerCase();
+}
+
 function normalizePayload(payload: SupportedPayload): Record<string, any> {
   const clonedPayload = Object.assign({}, payload);
   switch (clonedPayload.type) {

js/ethereum-utils/test/signature.test.ts

@@ -11,6 +11,7 @@ import {
   createPasskeyPublicKey,
   signEip712,
   HexString,
+  verifyEip712Signature,
 } from '../src';
 
 describe('Signature related tests', function () {
@@ -140,6 +141,10 @@ describe('Signature related tests', function () {
       };
 
       assert.deepEqual(signature, expected);
+      assert(
+        verifyEip712Signature('0xf24FF3a9CF04c71Dbc94D0b566f7A27B94566cac', expected.Ecdsa, payload1),
+        'should verify'
+      );
     });
 
     it('should create a valid signature for PaginatedDeleteSignaturePayloadV2', async function () {
@@ -152,6 +157,10 @@ describe('Signature related tests', function () {
       };
 
       assert.deepEqual(signature, expected);
+      assert(
+        verifyEip712Signature('0xf24FF3a9CF04c71Dbc94D0b566f7A27B94566cac', expected.Ecdsa, payload1),
+        'should verify'
+      );
     });
 
     it('should create a valid signature for ItemizedSignaturePayloadV2', async function () {
@@ -167,6 +176,10 @@ describe('Signature related tests', function () {
       };
 
       assert.deepEqual(signature, expected);
+      assert(
+        verifyEip712Signature('0xf24FF3a9CF04c71Dbc94D0b566f7A27B94566cac', expected.Ecdsa, payload1),
+        'should verify'
+      );
     });
 
     it('should create a valid signature for AddKeyData', async function () {
@@ -183,6 +196,10 @@ describe('Signature related tests', function () {
       };
 
       assert.deepEqual(signature, expected);
+      assert(
+        verifyEip712Signature('0xf24FF3a9CF04c71Dbc94D0b566f7A27B94566cac', expected.Ecdsa, payload1),
+        'should verify'
+      );
     });
 
     it('should create a valid signature for AddProvider', async function () {
@@ -195,6 +212,10 @@ describe('Signature related tests', function () {
       };
 
       assert.deepEqual(signature, expected);
+      assert(
+        verifyEip712Signature('0xf24FF3a9CF04c71Dbc94D0b566f7A27B94566cac', expected.Ecdsa, payload1),
+        'should verify'
+      );
     });
 
     it('should create a valid signature for ClaimHandlePayload', async function () {
@@ -207,6 +228,10 @@ describe('Signature related tests', function () {
       };
 
       assert.deepEqual(signature, expected);
+      assert(
+        verifyEip712Signature('0xf24FF3a9CF04c71Dbc94D0b566f7A27B94566cac', expected.Ecdsa, payload1),
+        'should verify'
+      );
     });
 
     it('should create a valid signature for PasskeyPublicKey', async function () {
@@ -219,6 +244,10 @@ describe('Signature related tests', function () {
       };
 
       assert.deepEqual(signature, expected);
+      assert(
+        verifyEip712Signature('0xf24FF3a9CF04c71Dbc94D0b566f7A27B94566cac', expected.Ecdsa, payload1),
+        'should verify'
+      );
     });
   });
 });