Signed Application file - how to get the signature from the file?

To retrieve the digital signature information from a signed application file, you'll need to use specific APIs or tools that can read and interpret the digital signature. The exact method will depend on the type of file you're dealing with and the programming language you're using. Here are a few approaches you can consider:

Using Windows Command Line:
For Windows executables and installer files, you can use the signtool command-line utility that comes with the Windows SDK. Here's an example command to view signature information:

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signtool verify /pa "path_to_signed_file"

Using PowerShell:
You can use PowerShell to retrieve signature information using the Get-AuthenticodeSignature cmdlet. Here's an example:

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$signature = Get-AuthenticodeSignature "path_to_signed_file"

$signature.SignerCertificate

Using a Programming Language:
If you're using a programming language like C# or Python, you can use libraries and APIs to read digital signature information. For C#, you can use the System.Security.Cryptography namespace. For Python, you might use the cryptography library.

Here's an example in C#:

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using System.Security.Cryptography;

using System.Security.Cryptography.X509Certificates;



class Program

{

    static void Main(string[] args)

    {

        X509Certificate2 certificate = X509Certificate2.CreateFromSignedFile("path_to_signed_file");

        Console.WriteLine("Subject: " + certificate.Subject);

    }

}

Please note that the specifics will depend on the type of file you're dealing with (executable, installer, DLL, etc.) and the kind of signature it uses (Authenticode, code signing, etc.). It's also important to ensure that you're working with signed files from trusted sources to avoid potential security risks.