diff --git a/packages/login/package.json b/packages/login/package.json
index 72480db2..25466b65 100644
--- a/packages/login/package.json
+++ b/packages/login/package.json
@@ -55,6 +55,7 @@
     "@portkey/services": "1.3.0-alpha.3",
     "@portkey/types": "1.3.0-alpha.3",
     "@portkey/utils": "1.3.0-alpha.3",
+    "@types/bn.js": "^5.1.3",
     "aelf-bridge": "^0.0.10",
     "aelf-sdk": "^3.2.40",
     "ahooks": "^3.7.7",
diff --git a/packages/login/src/utils/zeroFill.ts b/packages/login/src/utils/zeroFill.ts
new file mode 100644
index 00000000..e590d338
--- /dev/null
+++ b/packages/login/src/utils/zeroFill.ts
@@ -0,0 +1,4 @@
+import BN, { isBN } from 'bn.js';
+export function zeroFill(str: string | BN) {
+  return isBN(str) ? str.toString(16, 64) : str.padStart(64, '0');
+}
diff --git a/packages/login/src/wallets/discover/useDiscover.ts b/packages/login/src/wallets/discover/useDiscover.ts
index c020d3b6..dd8a5dc1 100644
--- a/packages/login/src/wallets/discover/useDiscover.ts
+++ b/packages/login/src/wallets/discover/useDiscover.ts
@@ -18,7 +18,8 @@ import { DiscoverOptions } from 'src/types';
 import useChainIdsSync from './useChainIdsSync';
 import { ERR_CODE, makeError } from '../../errors';
 import wait from '../../utils/waitForSeconds';
-import BN from 'bn.js';
+import { zeroFill } from '../../utils/zeroFill';
+
 export type DiscoverDetectState = 'unknown' | 'detected' | 'not-detected';
 export type DiscoverInterface = WalletHookInterface & {
   discoverDetected: DiscoverDetectState;
@@ -263,12 +264,11 @@ export function useDiscover({
           data: signInfo || params.hexToBeSign,
         },
       });
-      signedMsgObject.r = '1';
-      signedMsgObject.s = '2';
-      const r = BN.isBN(signedMsgObject.r) ? signedMsgObject.r.toString(16, 64) : signedMsgObject.r.padStart(64, '0');
-      const s = BN.isBN(signedMsgObject.s) ? signedMsgObject.s.toString(16, 64) : signedMsgObject.s.padStart(64, '0');
-      const signedMsgString = [r, s, `0${signedMsgObject.recoveryParam!.toString()}`].join('');
-
+      const signedMsgString = [
+        zeroFill(signedMsgObject.r),
+        zeroFill(signedMsgObject.s),
+        `0${signedMsgObject.recoveryParam!.toString()}`,
+      ].join('');
       return {
         error: 0,
         errorMessage: '',
diff --git a/packages/login/src/wallets/elf/useElf.ts b/packages/login/src/wallets/elf/useElf.ts
index a8427a23..a73d8998 100644
--- a/packages/login/src/wallets/elf/useElf.ts
+++ b/packages/login/src/wallets/elf/useElf.ts
@@ -8,7 +8,7 @@ import { WalletType, WebLoginState, WebLoginEvents } from '../../constants';
 import isMobile from '../../utils/isMobile';
 import checkSignatureParams from '../../utils/signatureParams';
 import detectNightElf from './detectNightElf';
-import BN from 'bn.js';
+import { zeroFill } from '../../utils/zeroFill';
 
 export function useElf({
   options,
@@ -235,9 +235,11 @@ export function useElf({
           signedMsgObject.errorMessage.message || signedMsgObject.errorMessage || signedMsgObject.message,
         );
       }
-      const r = BN.isBN(signedMsgObject.r) ? signedMsgObject.r.toString(16, 64) : signedMsgObject.r.padStart(64, '0');
-      const s = BN.isBN(signedMsgObject.s) ? signedMsgObject.s.toString(16, 64) : signedMsgObject.s.padStart(64, '0');
-      const signedMsgString = [r, s, `0${signedMsgObject.recoveryParam.toString()}`].join('');
+      const signedMsgString = [
+        zeroFill(signedMsgObject.r),
+        zeroFill(signedMsgObject.s),
+        `0${signedMsgObject.recoveryParam.toString()}`,
+      ].join('');
       return {
         error: 0,
         errorMessage: '',
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 5c38de50..7a2418fb 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -133,6 +133,7 @@ importers:
       '@portkey/services': 1.3.0-alpha.3
       '@portkey/types': 1.3.0-alpha.3
       '@portkey/utils': 1.3.0-alpha.3
+      '@types/bn.js': ^5.1.3
       '@types/uuid': ^8.3.4
       aelf-bridge: ^0.0.10
       aelf-sdk: ^3.2.40
@@ -152,6 +153,7 @@ importers:
       '@portkey/services': registry.npmjs.org/@portkey/services/1.3.0-alpha.3
       '@portkey/types': registry.npmjs.org/@portkey/types/1.3.0-alpha.3
       '@portkey/utils': registry.npmjs.org/@portkey/utils/1.3.0-alpha.3
+      '@types/bn.js': registry.npmjs.org/@types/bn.js/5.1.3
       aelf-bridge: registry.npmjs.org/aelf-bridge/0.0.10
       aelf-sdk: registry.npmjs.org/aelf-sdk/3.2.44
       ahooks: registry.npmjs.org/ahooks/3.7.8