byte[] originalDecKey = testDecryptionKey.clone();

        // Ensure keys are not zero initially
        assertFalse(isAllZeros(originalEncKey), "Original encryption key should not be all zeros");
        assertFalse(isAllZeros(originalDecKey), "Original decryption key should not be all zeros");

        // When
        encryptionContext.secureWipeKeys();

        assertEquals((byte) 0x53, aad[2]);
        assertEquals((byte) 0xFD, aad[3]);

        // Verify signature is zeroed out (16 bytes of zeros)
        for (int i = 4; i < 20; i++) {
            assertEquals(0, aad[i], "Signature bytes should be zero in AAD");
        }

        // Verify nonce matches at position 20
        for (int i = 0; i < 16; i++) {

            verify(mockNdrBuffer).advance(8); // sub_authority advance (4 * 2)
            verify(mockNdrBuffer, times(2)).derive(anyInt());

            // Verify identifier_authority bytes (5 zeros + 1 five)
            verify(mockNdrBuffer, times(5)).enc_ndr_small((byte) 0);
            verify(mockNdrBuffer).enc_ndr_small((byte) 5);

            // Verify sub_authority values

        srvsvc.ShareInfo502 info502 = new srvsvc.ShareInfo502();
        byte[] securityDescriptorBytes = new byte[20];
        securityDescriptorBytes[0] = 1; // revision
        // Rest are zeros - no DACL
        info502.security_descriptor = securityDescriptorBytes;
        info502.sd_size = securityDescriptorBytes.length;

        // Replace info field

        assertArrayEquals(testFileId, copiedFileId);
    }

    @Test
    @DisplayName("Test with various file ID patterns")
    void testWithVariousFileIdPatterns() {
        // Test with all zeros
        byte[] zeroFileId = new byte[16];
        Smb2CloseRequest zeroRequest = new Smb2CloseRequest(mockConfig, zeroFileId, testFileName);
        testFileIdInRequest(zeroRequest, zeroFileId);

 * @author Gregory Kick
 * @since 7.0
 */
@GwtCompatible
public final class Ascii {

  private Ascii() {}

  /* The ASCII control characters, per RFC 20. */
  /**
   * Null ('\0'): The all-zeros character which may serve to accomplish time fill and media fill.
   * Normally used as a C string terminator.
   *
   * <p>Although RFC 20 names this as "Null", note that it is distinct from the C/C++ "NULL"
   * pointer.

            buf.writeOctetArray(contextHandle, 0, Math.min(contextHandle.length, 20));
            // Pad with zeros if context handle is shorter than 20 bytes
            for (int i = contextHandle.length; i < 20; i++) {
                buf.enc_ndr_small(0);
            }
        } else {
            // Write 20 zero bytes for null context handle
            for (int i = 0; i < 20; i++) {
                buf.enc_ndr_small(0);

    }

    @Test
    @DisplayName("Should handle edge case with all zero session key")
    void testDeriveKeys_AllZeroSessionKey() {
        // Given
        byte[] zeroSessionKey = new byte[16]; // All zeros
        int dialect = Smb2Constants.SMB2_DIALECT_0311;

        // When

			c = ' ' // Treat the checksum field itself as all spaces.
		}
		unsigned += int64(c)
		signed += int64(int8(c))
	}
	return unsigned, signed
}

// reset clears the block with all zeros.
func (b *block) reset() {
	*b = block{}
}

type headerV7 [blockSize]byte

func (h *headerV7) name() []byte     { return h[000:][:100] }
func (h *headerV7) mode() []byte     { return h[100:][:8] }

   * @return the count of the element before the operation; possibly zero
   * @throws IllegalArgumentException if {@code count} is negative
   * @throws NullPointerException if {@code element} is null and this implementation does not permit
   *     null elements. Note that if {@code count} is zero, the implementor may optionally return
   *     zero instead.
   */
  @CanIgnoreReturnValue