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private bool validatePKCS1Signature(string signatureFromAudkenni, string hashStringFromAuthenticationRequest, string usersCertFromAudkenni)
{
    byte[] orgHash = null;
    byte[] signedHash = null;
    byte[] certBytes = null;
    X509Certificate2 certificate = null;
    try
    {
        orgHash = Convert.FromBase64String(hashStringFromAuthenticationRequest);
        signedHash = Convert.FromBase64String(signatureFromAudkenni);
        certBytes = Convert.FromBase64String(usersCertFromAudkenni);
        certificate = new X509Certificate2(certBytes);
        RSA key = (RSA)certificate.PublicKey.Key;
        RSAPKCS1SignatureDeformatter formatter = new RSAPKCS1SignatureDeformatter(key);
        formatter.SetHashAlgorithm("SHA512");
        var result = formatter.VerifySignature(orgHash, signedHash);
        return result;
    }
    catch (CryptographicException e)
    {
        return false;
    }
}