java.util.Arrays.fill(this.nonce, (byte) 0);
            System.arraycopy(nonce, 0, this.nonce, 0, 12);
        } else if (nonce.length == 16) {
            // For GCM cipher, use full 16-byte nonce
            System.arraycopy(nonce, 0, this.nonce, 0, 16);
        } else {
            throw new IllegalArgumentException("Nonce must be 12 bytes (CCM) or 16 bytes (GCM)");
        }

        return metrics;
    }

    /**
     * Generate a unique nonce for encryption following SMB3 specification.
     * Uses SMB3-compliant nonce generation with guaranteed uniqueness.
     *
     * @return nonce appropriate for the dialect (16 bytes for GCM, 12 bytes for CCM)
     */
    public byte[] generateNonce() {
        final byte[] nonce = new byte[isGCMCipher() ? 16 : 12];

        if (isGCMCipher()) {

            }

            final String nonce = (String) claimsSet.getClaim("nonce");
            if (logger.isDebugEnabled()) {
                logger.debug("nonce={}", nonce);
            }
            if (StringUtils.isEmpty(nonce) || !nonce.equals(stateData.getNonce())) {
                throw new SsoLoginException("could not validate nonce");
            }

            byte[] nonce = context.generateNonce();
            assertNotNull(nonce, "Nonce should not be null");
            assertTrue(nonce.length > 0, "Nonce should have length > 0");

            // Convert to string for uniqueness check
            String nonceStr = Arrays.toString(nonce);
            assertFalse(nonces.contains(nonceStr), "Nonce should be unique");
            nonces.add(nonceStr);

        });
    }

    @Test
    @DisplayName("Should handle null nonce")
    void testNullNonce() {
        // When/Then
        assertThrows(NullPointerException.class, () -> {
            transformHeader.setNonce(null);
        });
    }

    @Test
    @DisplayName("Should handle invalid nonce length")
    void testInvalidNonceLength() {
        // Given

     * @param password
     *            The user's password.
     * @param challenge
     *            The server challenge.
     * @param clientChallenge
     *            The client challenge (nonce).
     * @return the calculated response
     * @throws GeneralSecurityException if a cryptographic error occurs
     */

- **Pre-Authentication Integrity**: SMB 3.1.1 PAI for preventing downgrade attacks
- **Automatic Detection**: Encryption automatically enabled when servers require it
- **Secure Key Management**: Proper key derivation and nonce generation

### Core Features
- **Per-context configuration**: No global state, each context encapsulates configuration
- **Authentication**: NTLM, Kerberos, SPNEGO unified subsystem

     * @param user The username.
     * @param password The user's password.
     * @param challenge The server challenge.
     * @param clientChallenge The client challenge (nonce).
     * @return the LMv2 response bytes
     */
    public static byte[] getLMv2Response(final String domain, final String user, final String password, final byte[] challenge,
            final byte[] clientChallenge) {

### Feature

        verify(dcerpcSecurityProvider, times(1)).wrap(mockNdrBuffer);
    }

    @Test
    void testUnwrapMethodIsCalled() throws DcerpcException {
        // Test that the unwrap method can be called without throwing an exception
        dcerpcSecurityProvider.unwrap(mockNdrBuffer);

        // Verify that the unwrap method was called exactly once with the mockNdrBuffer