diff --git a/lib/app/shared/extension/string_extension.dart b/lib/app/shared/extension/string_extension.dart
index e57dcc269..d3b1f47f4 100644
--- a/lib/app/shared/extension/string_extension.dart
+++ b/lib/app/shared/extension/string_extension.dart
@@ -1,3 +1,6 @@
+import 'dart:convert';
+
+import 'package:convert/convert.dart';
 import 'package:flutter/material.dart';
 import 'package:intl/intl.dart';
 
@@ -34,4 +37,10 @@ extension StringExtension on String {
   }
 
   Characters get characters => Characters(this);
+
+  String get char2Bytes {
+    final List<int> encode = utf8.encode(this);
+    final String bytes = hex.encode(encode);
+    return bytes;
+  }
 }
diff --git a/lib/app/shared/helper_functions/helper_functions.dart b/lib/app/shared/helper_functions/helper_functions.dart
index b852d7552..ac7194c86 100644
--- a/lib/app/shared/helper_functions/helper_functions.dart
+++ b/lib/app/shared/helper_functions/helper_functions.dart
@@ -22,6 +22,9 @@ import 'package:key_generator/key_generator.dart';
 import 'package:oidc4vc/oidc4vc.dart';
 import 'package:permission_handler/permission_handler.dart';
 import 'package:secure_storage/secure_storage.dart';
+import 'package:pointycastle/pointycastle.dart' as pc;
+import 'package:asn1lib/asn1lib.dart' as asn1lib;
+import 'package:x509/x509.dart' as x509;
 
 String generateDefaultAccountName(
   int accountIndex,
@@ -81,23 +84,17 @@ String stringToHexPrefixedWith05({required String payload}) {
     payload,
   ].join(' ');
 
-  final String bytes = char2Bytes(formattedInput);
+  final String bytes = formattedInput.char2Bytes;
 
   const String prefix = '05';
   const String stringIsHex = '0100';
-  final String bytesOfByteLength = char2Bytes(bytes.length.toString());
+  final String bytesOfByteLength = bytes.length.toString().char2Bytes;
 
   final payloadBytes = '$prefix$stringIsHex$bytesOfByteLength$bytes';
 
   return payloadBytes;
 }
 
-String char2Bytes(String text) {
-  final List<int> encode = utf8.encode(text);
-  final String bytes = hex.encode(encode);
-  return bytes;
-}
-
 Future<bool> isConnected() async {
   final log = getLogger('Check Internet Connection');
 
@@ -1795,3 +1792,87 @@ List<dynamic> collectSdValues(Map<String, dynamic> data) {
 
   return result;
 }
+
+Future<Map<String, dynamic>?> checkX509({
+  required String encodedData,
+  required String clientId,
+  required JWTDecode jwtDecode,
+}) async {
+  final Map<String, dynamic> header =
+      decodeHeader(jwtDecode: jwtDecode, token: encodedData);
+
+  final x5c = header['x5c'];
+
+  if (x5c != null) {
+    if (x5c is! List) {
+      throw ResponseMessage(
+        data: {
+          'error': 'invalid_format',
+          'error_description': 'x509_san_dns scheme error',
+        },
+      );
+    }
+
+    //array x5c[0], it is a certificat in DER format (binary)
+    final certificate = x5c.firstOrNull;
+
+    if (certificate == null) {
+      throw ResponseMessage(
+        data: {
+          'error': 'invalid_format',
+          'error_description': 'x509_san_dns scheme error',
+        },
+      );
+    }
+
+    final decoded = base64Decode(certificate.toString());
+    final seq = asn1lib.ASN1Sequence.fromBytes(decoded);
+    final cert = x509.X509Certificate.fromAsn1(seq);
+
+    final subject = cert.tbsCertificate.subject;
+
+    if (subject == null) {
+      throw ResponseMessage(
+        data: {
+          'error': 'invalid_format',
+          'error_description': 'x509_san_dns scheme error',
+        },
+      );
+    }
+
+    final names = subject.names;
+
+    if (names.isEmpty) {
+      throw ResponseMessage(
+        data: {
+          'error': 'invalid_format',
+          'error_description': 'x509_san_dns scheme error',
+        },
+      );
+    }
+
+    final value = names[0].entries.map((element) => element.value).toList();
+
+    if (!value.contains(clientId)) {
+      throw ResponseMessage(
+        data: {
+          'error': 'invalid_format',
+          'error_description': 'x509_san_dns scheme error',
+        },
+      );
+    }
+
+    final publicKey = cert.publicKey;
+    if (publicKey is x509.RsaPublicKey) {
+      final BigInt modulus = BigInt.parse(publicKey.modulus.toString());
+      final n = base64Encode(modulus.toBytes);
+      final publicKeyJwk = {
+        'e': 'AQAB',
+        'kty': 'RSA',
+        'n': n.replaceAll('=', ''),
+      };
+      return publicKeyJwk;
+    }
+  }
+  return null;
+}
diff --git a/lib/dashboard/qr_code/qr_code_scan/cubit/qr_code_scan_cubit.dart b/lib/dashboard/qr_code/qr_code_scan/cubit/qr_code_scan_cubit.dart
index 04dcfe6e3..8f01cc428 100644
--- a/lib/dashboard/qr_code/qr_code_scan/cubit/qr_code_scan_cubit.dart
+++ b/lib/dashboard/qr_code/qr_code_scan/cubit/qr_code_scan_cubit.dart
@@ -13,11 +13,9 @@ import 'package:altme/polygon_id/polygon_id.dart';
 import 'package:altme/query_by_example/query_by_example.dart';
 import 'package:altme/scan/scan.dart';
 import 'package:altme/wallet/cubit/wallet_cubit.dart';
-import 'package:asn1lib/asn1lib.dart' as asn1lib;
 import 'package:beacon_flutter/beacon_flutter.dart';
 import 'package:bloc/bloc.dart';
 import 'package:credential_manifest/credential_manifest.dart';
-import 'package:dart_jsonwebtoken/dart_jsonwebtoken.dart';
 import 'package:did_kit/did_kit.dart';
 import 'package:dio/dio.dart';
 import 'package:equatable/equatable.dart';
@@ -25,9 +23,7 @@ import 'package:flutter/material.dart';
 import 'package:json_annotation/json_annotation.dart';
 import 'package:jwt_decode/jwt_decode.dart';
 import 'package:oidc4vc/oidc4vc.dart';
-import 'package:pointycastle/pointycastle.dart' as pc;
 import 'package:secure_storage/secure_storage.dart';
-import 'package:x509/x509.dart' as x509;
 part 'qr_code_scan_cubit.g.dart';
 part 'qr_code_scan_state.dart';
 
@@ -1094,8 +1090,11 @@ class QRCodeScanCubit extends Cubit<QRCodeScanState> {
 
         if (clientIdScheme != null) {
           if (clientIdScheme == 'x509_san_dns') {
-            publicKeyJwk =
-                await checkX509(clientId: clientId, encodedData: encodedData);
+            publicKeyJwk = await checkX509(
+              clientId: clientId,
+              encodedData: encodedData,
+              jwtDecode: jwtDecode,
+            );
           }
         }
 
@@ -1127,89 +1126,6 @@ class QRCodeScanCubit extends Cubit<QRCodeScanState> {
     }
   }
 
-  Future<Map<String, dynamic>?> checkX509({
-    required String encodedData,
-    required String clientId,
-  }) async {
-    final Map<String, dynamic> header =
-        decodeHeader(jwtDecode: jwtDecode, token: encodedData);
-
-    final x5c = header['x5c'];
-
-    if (x5c != null) {
-      if (x5c is! List) {
-        throw ResponseMessage(
-          data: {
-            'error': 'invalid_format',
-            'error_description': 'x509_san_dns scheme error',
-          },
-        );
-      }
-
-      //array x5c[0], it is a certificat in DER format (binary)
-      final certificate = x5c.firstOrNull;
-
-      if (certificate == null) {
-        throw ResponseMessage(
-          data: {
-            'error': 'invalid_format',
-            'error_description': 'x509_san_dns scheme error',
-          },
-        );
-      }
-
-      final decoded = base64Decode(certificate.toString());
-      final seq = asn1lib.ASN1Sequence.fromBytes(decoded);
-      final cert = x509.X509Certificate.fromAsn1(seq);
-
-      final subject = cert.tbsCertificate.subject;
-
-      if (subject == null) {
-        throw ResponseMessage(
-          data: {
-            'error': 'invalid_format',
-            'error_description': 'x509_san_dns scheme error',
-          },
-        );
-      }
-
-      final names = subject.names;
-
-      if (names.isEmpty) {
-        throw ResponseMessage(
-          data: {
-            'error': 'invalid_format',
-            'error_description': 'x509_san_dns scheme error',
-          },
-        );
-      }
-
-      final value = names[0].entries.map((element) => element.value).toList();
-
-      if (!value.contains(clientId)) {
-        throw ResponseMessage(
-          data: {
-            'error': 'invalid_format',
-            'error_description': 'x509_san_dns scheme error',
-          },
-        );
-      }
-
-      final publicKey = cert.publicKey;
-      if (publicKey is x509.RsaPublicKey) {
-        final BigInt modulus = BigInt.parse(publicKey.modulus.toString());
-        final n = base64Encode(modulus.toBytes);
-        final publicKeyJwk = {
-          'e': 'AQAB',
-          'kty': 'RSA',
-          'n': n.replaceAll('=', ''),
-        };
-        return publicKeyJwk;
-      }
-    }
-    return null;
-  }
-
   /// complete SIOPV2 Flow
   Future<void> completeSiopV2Flow() async {
     try {