import java.security.MessageDigest;

/**
 * This is an implementation of the HMACT64 keyed hashing algorithm.
 * HMACT64 is defined by Luke Leighton as a modified HMAC-MD5 (RFC 2104)
 * in which the key is truncated at 64 bytes (rather than being hashed
 * via MD5).
 */
class HMACT64 extends MessageDigest implements Cloneable {

    private static final int BLOCK_LENGTH = 64;

    private static final byte IPAD = (byte) 0x36;

  }

  private int nextRandomKey() {
    int a = random.nextInt(max);

    /*
     * For example, if concentration=2.0, the following takes the square root of
     * the uniformly-distributed random integer, then truncates any fractional
     * part, so higher integers would appear (in this case linearly) more often
     * than lower ones.
     */
    return (int) Math.pow(a, 1.0 / concentration);
  }

  @AfterExperiment

            // Challenge bytes would be at 24-31 but we're truncated

            // When & Then
            assertThrows(ArrayIndexOutOfBoundsException.class, () -> new Type2Message(truncatedMessage));
        }

        @Test
        @DisplayName("parse should handle truncated message missing target info")
        void testParse_InputLengthTooSmallForTargetInfo() {
            // Given

- Protobuf serialization of metav1.MicroTime timestamps (used in `Lease` and `Event` API objects) has been corrected to truncate to microsecond precision, to match the documented behavior and JSON/YAML serialization. Any existing persisted data is truncated to microsecond when read from etcd. ([#111936](https://github.com/kubernetes/kubernetes/pull/111936), [@haoruan](https://github.com/haoruan))

              rangeToRemove.upperBound,
              rangeMapEntry.getUpperBound(),
              mapEntryBelowToTruncate.getValue().getValue());
        }
        // overwrite mapEntryToTruncateBelow with a truncated range
        putRangeMapEntry(
            rangeMapEntry.getLowerBound(),
            rangeToRemove.lowerBound,
            mapEntryBelowToTruncate.getValue().getValue());
      }
    }

pkg syscall (freebsd-arm64), func SysctlUint32(string) (uint32, error)
pkg syscall (freebsd-arm64), func TimevalToNsec(Timeval) int64
pkg syscall (freebsd-arm64), func Truncate(string, int64) error
pkg syscall (freebsd-arm64), func Umask(int) int
pkg syscall (freebsd-arm64), func Undelete(string) error
pkg syscall (freebsd-arm64), func UnixRights(...int) []uint8

pkg syscall (darwin-arm64), func Sysctl(string) (string, error)
pkg syscall (darwin-arm64), func SysctlUint32(string) (uint32, error)
pkg syscall (darwin-arm64), func TimevalToNsec(Timeval) int64
pkg syscall (darwin-arm64), func Truncate(string, int64) error
pkg syscall (darwin-arm64), func Umask(int) int
pkg syscall (darwin-arm64), func Undelete(string) error
pkg syscall (darwin-arm64), func UnixRights(...int) []uint8

pkg syscall (netbsd-arm64-cgo), func SysctlUint32(string) (uint32, error)
pkg syscall (netbsd-arm64-cgo), func TimevalToNsec(Timeval) int64
pkg syscall (netbsd-arm64-cgo), func Truncate(string, int64) error
pkg syscall (netbsd-arm64-cgo), func Umask(int) int
pkg syscall (netbsd-arm64-cgo), func UnixRights(...int) []uint8
pkg syscall (netbsd-arm64-cgo), func Unmount(string, int) error

* Pre-existing log files are now opened with O_APPEND, instead of O_TRUNC. This helps prevent losing logs when components crash-loop, and also enables external log rotation utilities to truncate log files in-place without components extending log files to their pre-truncation sizes on subsequent writes. ([#74837](https://github.com/kubernetes/kubernetes/pull/74837), [@mtaufen](https://github.com/mtaufen))

     * @param usage the Kerberos key usage number for this operation
     * @param baseKey the base Kerberos key for key derivation
     * @param input the data to calculate the MAC for
     * @return the calculated MAC bytes (truncated to 12 bytes)
     * @throws GeneralSecurityException if cryptographic operations fail
     */
    public static byte[] calculateMacHMACAES(int usage, KerberosKey baseKey, byte[] input) throws GeneralSecurityException {