if (log.isTraceEnabled()) {
            log.trace("update: " + this.updates + " " + offset + ":" + len);
            log.trace(Hexdump.toHexString(input, offset, Math.min(len, 256)));
        }
        if (len == 0) {
            return; /* CRITICAL */
        }
        this.digest.update(input, offset, len);
        this.updates++;
    }

    /**

        byte[] fileId = new byte[16];
        Arrays.fill(fileId, (byte) 0xCC);

        byte[] header = buildSmb2Header();
        int ctxOffsetFromHeader = 256; // arbitrary aligned location beyond header
        byte[] baseBody = buildCreateBodyWithContext(fileId, ctxOffsetFromHeader);

        // Build actual context bytes matching the pointers inside baseBody

	// While this format is compatible with most tar readers,
	// the format has several limitations making it unsuitable for some usages.
	// Most notably, it cannot support sparse files, files larger than 8GiB,
	// filenames larger than 256 characters, and non-ASCII filenames.
	//
	// Reference:
	//	http://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13_06
	FormatUSTAR

        if (context != null) {
            System.arraycopy(context, 0, input, pos, context.length);
        }

        // Use SHA-256 for derivation (placeholder)
        try {
            java.security.MessageDigest md = java.security.MessageDigest.getInstance("SHA-256");
            byte[] hash = md.digest(input);
            System.arraycopy(hash, 0, derived, 0, Math.min(length, hash.length));

functions are defined in gcm_*.s. //go:noescape func gcmAesInit(productTable *[256]byte, ks []uint32) //go:noescape func gcmAesData(productTable *[256]byte, data []byte, T *[16]byte) //go:noescape func gcmAesEnc(productTable *[256]byte, dst, src []byte, ctr, T *[16]byte, ks []uint32) //go:noescape func gcmAesDec(productTable *[256]byte, dst, src []byte, ctr, T *[16]byte, ks []uint32) //go:noescape func gcmAesFinish(productTable *[256]byte, tagMask, T *[16]byte, pLen, dLen uint64) // Keep in sync with cr...

            this.preauthSalt = salt;

            if (config.isEncryptionEnabled()) {
                // Build cipher list based on AES-256 support
                List<Integer> ciphers = new ArrayList<>();

                // Prefer GCM over CCM for better performance
                if (config.isAES256Enabled()) {

        }
    }

    /**
     * Counts the number of unique bytes in the data (for entropy estimation).
     */
    private int countUniqueBytes(byte[] data) {
        boolean[] seen = new boolean[256];
        int count = 0;

        for (byte b : data) {
            int index = b & 0xFF;
            if (!seen[index]) {
                seen[index] = true;
                count++;
            }

        @BeforeEach
        void setUp() {
            testName = "CREATE_CONTEXT_TEST".getBytes(StandardCharsets.UTF_8);
            testResponse = new TestCreateContextResponse(testName);
            testBuffer = new byte[256];
            Arrays.fill(testBuffer, (byte) 0x42);
        }

        @Test
        @DisplayName("Should correctly store and return name")
        void testNameStorage() {

    void testMaxOffsetBoundary() {
        // Arrange
        byte[] largeData = new byte[1000];
        for (int i = 0; i < largeData.length; i++) {
            largeData[i] = (byte) (i % 256);
        }
        int offset = 990;
        int length = 10;

        TransTransactNamedPipe trans = new TransTransactNamedPipe(mockConfig, TEST_FID, largeData, offset, length);
        byte[] dst = new byte[100];

	MOVD -391(R17), R3                         // 3b1e06d1630340f9
	MOVD -257(R17), R3                         // 3b0604d1630340f9
	MOVD -256(R17), R3                         // 230250f8
	MOVD 255(R17), R3                          // 23f24ff8
	MOVD 256(R17), R3                          // 238240f9
	MOVD 257(R17), R3                          // 3b060491630340f9
	MOVD 391(R17), R3                          // 3b1e0691630340f9