// When/Then
        assertThrows(IllegalArgumentException.class, () -> {
            transformHeader.setNonce(shortNonce);
        });

        assertThrows(IllegalArgumentException.class, () -> {
            transformHeader.setNonce(longNonce);
        });
    }

    @Test
    @DisplayName("Should handle null signature")
    void testNullSignature() {
        // When/Then

            if (logger.isDebugEnabled()) {
                logger.debug("nonce: {}", nonce);
            }
            if (StringUtils.isEmpty(nonce) || !nonce.equals(stateData.getNonce())) {
                throw new SsoLoginException("could not validate nonce");
            }
        } catch (final SsoLoginException e) {
            throw e;
        } catch (final Exception e) {

            final Smb2TransformHeader transformHeader = Smb2TransformHeader.decode(encryptedMessage, 0);
            final byte[] associatedData = transformHeader.getAssociatedData();
            byte[] nonce = transformHeader.getNonce();
            final byte[] authTag = transformHeader.getSignature();

            // Extract ciphertext
            final int ciphertextLength = encryptedMessage.length - Smb2TransformHeader.TRANSFORM_HEADER_SIZE;