Problems with X509Store Certificates.Find FindByThumbprint

Question

I\'m having a problem when I use the method X509Store.Certificates.Find

public static X509Certificate2 FromStore(StoreName storeName, 
                  


        

Answer 1

This tripped me up too, I wrote this function to clean the thumbprint when copied and pasted from MMC:

public string CleanThumbprint(string mmcThumbprint)
    {
        //replace spaces, non word chars and convert to uppercase
        return Regex.Replace(mmcThumbprint, @"\s|\W", "").ToUpper();
    }

...
        var myThumbprint = CleanThumbprint("‎b3 ab 84 e5 1e e5 e4 75 e7 a5 3e 27 8c 87 9d 2f 05 02 27 56");
        var myCertificate = certificates.Find(X509FindType.FindByThumbprint, myThumbprint, true)[0];