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

I took some of the answers here and combined them into a static method that takes care of removing special characters and upper cases everything. Hopefully someone else can use it.

    public static X509Certificate2 GetCertificate(string thumbprint)
    {
        // strip any non-hexadecimal values and make uppercase
        thumbprint = Regex.Replace(thumbprint, @"[^\da-fA-F]", string.Empty).ToUpper();
        var store = new X509Store(StoreName.My, StoreLocation.LocalMachine);

        try
        {
            store.Open(OpenFlags.ReadOnly);

            var certCollection = store.Certificates;
            var signingCert = certCollection.Find(X509FindType.FindByThumbprint, thumbprint, false);
            if (signingCert.Count == 0)
            {
                throw new FileNotFoundException(string.Format("Cert with thumbprint: '{0}' not found in local machine cert store.", thumbprint));
            }

            return signingCert[0];
        }
        finally
        {
            store.Close();
        }
    }