diff --git a/src/api/addAttachedSignature.test.ts b/src/api/addAttachedSignature.test.ts
index 620a696..ddb04f0 100644
--- a/src/api/addAttachedSignature.test.ts
+++ b/src/api/addAttachedSignature.test.ts
@@ -31,6 +31,7 @@ const executionFlow = {
     propset_ContentEncoding: jest.fn(),
     propset_Content: jest.fn(),
     SignCades: jest.fn(() => executionSteps[4]),
+    VerifyCades: jest.fn(),
     CoSignCades: jest.fn(() => executionSteps[5]),
   },
   [executionSteps[2]]: {
diff --git a/src/api/addAttachedSignature.ts b/src/api/addAttachedSignature.ts
index f9d2f0a..48ee4a0 100644
--- a/src/api/addAttachedSignature.ts
+++ b/src/api/addAttachedSignature.ts
@@ -72,6 +72,7 @@ export const addAttachedSignature = _afterPluginsLoaded(
         let signature: string;
 
         try {
+          void (__cadesAsyncToken__ + cadesSignedData.VerifyCades(messageBase64, cadesplugin.CADESCOM_PKCS7_TYPE));
           signature = __cadesAsyncToken__ + cadesSignedData.CoSignCades(cadesSigner, cadesplugin.CADESCOM_PKCS7_TYPE);
         } catch (error) {
           console.error(error);
diff --git a/src/api/addDetachedSignature.test.ts b/src/api/addDetachedSignature.test.ts
index 25a1f57..6225f62 100644
--- a/src/api/addDetachedSignature.test.ts
+++ b/src/api/addDetachedSignature.test.ts
@@ -32,6 +32,7 @@ const executionFlow = {
     propset_ContentEncoding: jest.fn(),
     propset_Content: jest.fn(),
     SignHash: jest.fn(() => executionSteps[4]),
+    VerifyCades: jest.fn(),
     CoSignHash: jest.fn(() => executionSteps[6]),
   },
   [executionSteps[2]]: {
diff --git a/src/api/addDetachedSignature.ts b/src/api/addDetachedSignature.ts
index adfa75c..abd57d6 100644
--- a/src/api/addDetachedSignature.ts
+++ b/src/api/addDetachedSignature.ts
@@ -74,6 +74,7 @@ export const addDetachedSignature = _afterPluginsLoaded(
         let signature: string;
 
         try {
+          void (__cadesAsyncToken__ + cadesSignedData.VerifyCades(cadesHashedData, cadesplugin.CADESCOM_PKCS7_TYPE));
           signature =
             __cadesAsyncToken__ +
             cadesSignedData.CoSignHash(cadesHashedData, cadesSigner, cadesplugin.CADESCOM_PKCS7_TYPE);