/**
     * Calculates a MAC using the ARCFOUR-HMAC-MD5 algorithm.
     * This method implements the Microsoft variant of the Kerberos ARCFOUR-HMAC-MD5 checksum.
     *
     * @param keyusage the Kerberos key usage number for this operation
     * @param key the encryption key to use for MAC calculation
     * @param data the data to calculate the MAC for
     * @return the calculated MAC bytes

    /**
     * Calculate average send latency in microseconds
     *
     * @return average send latency
     */
    public double getAverageSendLatencyMicros() {
        long sends = rdmaSends.get();
        if (sends == 0) {
            return 0.0;
        }
        return totalSendTime.get() / (double) sends / 1000.0; // Convert to microseconds
    }

    /**

        @Test
        @DisplayName("Should calculate size for null ciphers")
        void testSizeWithNullCiphers() {
            EncryptionNegotiateContext context = new EncryptionNegotiateContext(mockConfig, null);

            assertEquals(4, context.size());
        }

        @Test
        @DisplayName("Should calculate size for empty ciphers")
        void testSizeWithEmptyCiphers() {

        for (int i = keyLen; i < 64; i++) {
            ipad[i] = 0x36;
            opad[i] = 0x5c;
        }

        // Calculate inner hash
        md5.reset();
        md5.update(ipad);
        md5.update(data);
        byte[] innerHash = md5.digest();

        // Calculate outer hash
        md5.reset();
        md5.update(opad);
        return md5.digest(innerHash);
    }

        }
    }

    @Nested
    @DisplayName("Size Calculation Tests")
    class SizeCalculationTests {

        @Test
        @DisplayName("Should calculate size correctly with single lock")
        void testSizeWithSingleLock() {
            Smb2Lock[] singleLock = new Smb2Lock[] { new Smb2Lock(0L, 100L, Smb2Lock.SMB2_LOCKFLAG_EXCLUSIVE_LOCK) };

        for (int i = keyLen; i < 64; i++) {
            ipad[i] = 0x36;
            opad[i] = 0x5c;
        }

        // Calculate inner hash
        md5.reset();
        md5.update(ipad);
        md5.update(data);
        byte[] innerHash = md5.digest();

        // Calculate outer hash
        md5.reset();
        md5.update(opad);
        byte[] expectedResult = md5.digest(innerHash);

import jcifs.BaseTest;

/**
 * Test class for Crypto utility functionality
 */
@DisplayName("Crypto Utility Tests")
class CryptoTest extends BaseTest {

    @Test
    @DisplayName("Should calculate MD4 hash correctly")
    void testMD4Hash() {
        // Given
        String input = "Hello World";
        byte[] data = input.getBytes();

        // When
        MessageDigest md4 = Crypto.getMD4();

        @Test
        @DisplayName("Should calculate size correctly with no data")
        void testSizeWithNoData() {
            request.setData(new byte[0], 0, 0);
            int expectedSize = ((Smb2Constants.SMB2_HEADER_LENGTH + 48 + 7) / 8) * 8;
            assertEquals(expectedSize, request.size());
        }

        @Test
        @DisplayName("Should calculate size correctly with data")

        @Test
        @DisplayName("Should calculate size for null hash algorithms and salt")
        void testSizeWithNullHashAlgosAndSalt() {
            PreauthIntegrityNegotiateContext context = new PreauthIntegrityNegotiateContext(mockConfig, null, null);

            assertEquals(4, context.size());
        }

        @Test
        @DisplayName("Should calculate size for empty arrays")

            responseTimeHistory.removeFirst();
        }

        // Calculate moving average (simple approach)
        if (!responseTimeHistory.isEmpty()) {
            long sum = responseTimeHistory.stream().mapToLong(Long::longValue).sum();
            avgResponseTime.set(sum / responseTimeHistory.size());

            // Calculate 95th percentile