Windows 10: Verify a signature file PKCS7 with WinCrypt

We are able to verify the signed document with the certificate in the p12 file if there is a single certificate in the p12 file. We are using CryptVerifyMessageSignature to verify the signer. How can we verify if there are multiple certificates in the p12 file?Code:#include<stdio.h>#include<windows.h>#include<wincrypt.h>#pragma comment lib, "crypt32"voidisi_hexdumpconst char *msg, const unsigned char *in, unsigned int len{ printf"%s [%d][", msg, len;

:)

 

When does the Operating system verify the Authenticode Signatures for signed EXEs and signed DLLs?

When PE Files (exes, dlls etc.) are code signed using signtool, they can be verified to check if they have been authored by trusted publishers. In which scenarios does the Operating system actually verify signed EXEs and DLLs?

1. Are signatures of EXEs verified every time they are run?
2. If an EXE has a dynamically linked DLL, is the DLL's signature verified when the EXE is run?
   
3. If the EXE dynamically loads a DLL using LoadLibrary, is the DLL's signature verified when the EXE is run?
4. When an EXE requires elevated privilege (UAC), is the signature of the EXE and the DLL dependencies verified as well? (1-3)

If this questions belongs in a different category or community, please let me know. Thanks.

 

Custom Signature in Mail??

Hi Eric,

Thank you for posting in Microsoft community.

1. Are you using outlook or other third party app?

If you are using mail app I suggest you to follow the steps below.

• Go to mail app.
• Tap on Switch to Setting icon on bottom left.
• Go to options.
• Turn on Signature; Choose the Signature you like.

Hope this helps. If the issue remains unresolved, please get back to us and we would be happy to help.

Thanks.

 

Adding signature...

Hi kathy,

Welcome to Microsoft Community and thank you for your interest in Windows 10.

I will definitely assist you, as per your query.

Please follow the below steps to add signature on mail app.

Step 1.

• Go the browser and open Outlook.com and log-in on the email.
• Click on gear box go to option.
• Locate for the Formatting, font and signature and click on it.

Once you create the signature go to mail app to turn on the signature option. Follow the below steps:

Step 2.

• 
  Open the mail app click on
  gear box.
  
• 
  Now click on option and turn on the
  signature option.
  

Hope this helps. If you need further assistance with Windows, let us know and will be glad to help.