<example>
      ${fe:label("value")}
    </example>
  </function>

  <function>
    <description>
      Returns Date from a given value.
    </description>
    <name>date</name>
    <function-class>org.codelibs.fess.taglib.FessFunctions</function-class>
    <function-signature>java.util.Date date(java.lang.Long)</function-signature>
    <example>

            // Zero signature field for calculation
            for (int i = 0; i < SIGNATURE_LENGTH; i++) {
                data[SIGNATURE_OFFSET + i] = 0;
            }

            mac.update(data, 0, data.length);
            byte[] signature = mac.doFinal();

            // Place signature in data
            System.arraycopy(signature, 0, data, SIGNATURE_OFFSET, SIGNATURE_LENGTH);

    }

    /**
     * Gets the signature or authentication tag for the encrypted message
     *
     * @return the signature/authentication tag
     */
    public byte[] getSignature() {
        return this.signature;
    }

    /**
     * Sets the signature or authentication tag for the encrypted message
     *
     * @param signature
     *            the signature/authentication tag to set
     */

    }

    /**
     * Returns the server signature used to validate PAC integrity.
     * @return the server signature
     */
    public PacSignature getServerSignature() {
        return this.serverSignature;
    }

    /**
     * Returns the KDC signature used to validate PAC authenticity.
     * @return the KDC signature
     */
    public PacSignature getKdcSignature() {

        }
        final byte[] signature = digest();
        for (int i = 0; i < 8; i++) {
            if (signature[i] != data[offset + SmbConstants.SIGNATURE_OFFSET + i]) {
                if (LogStream.level >= 2) {
                    log.println("signature verification failure");
                    Hexdump.hexdump(log, signature, 0, 8);

    /**
     * Verifies the signature of this response.
     *
     * @param buffer the buffer containing the signature data
     * @param i the starting index in the buffer
     * @param size the size of the signature data
     * @return whether signature verification is successful
     */
    boolean verifySignature(byte[] buffer, int i, int size);

    /**
     * Checks if signature verification failed.
     *

 */
package jcifs.smb;

/**
 * Exception thrown when SMB message signature validation fails.
 * Indicates that the integrity of an SMB message could not be verified.
 *
 * @author mbechler
 *
 */
public class SMBSignatureValidationException extends SmbException {

    /**
     * Default constructor for SMB signature validation exception.
     */
    public SMBSignatureValidationException() {
    }

    @Test
    @DisplayName("Should set and get signature")
    void testSignature() {
        // Given
        byte[] signature = new byte[16];
        new SecureRandom().nextBytes(signature);

        // When
        transformHeader.setSignature(signature);

        // Then
        assertArrayEquals(signature, transformHeader.getSignature());
    }

    @Test

          issuerUniqueID = null,
          subjectUniqueID = null,
          extensions = extensions(),
        )

      // Signature.
      val signature =
        Signature.getInstance(tbsCertificate.signatureAlgorithmName).run {
          initSign(issuerKeyPair.private)
          update(CertificateAdapters.tbsCertificate.toDer(tbsCertificate).toByteArray())
          sign().toByteString()

 */
package jcifs.pac;

import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;

/**
 * Represents a PAC signature structure containing checksum type and data.
 * This class parses and holds signature information from Kerberos PAC data,
 * supporting various checksum algorithms including HMAC-MD5 and HMAC-SHA1 with AES.
 */
public class PacSignature {

    /**