Class DESedeKeySpec

java.lang.Object
javax.crypto.spec.DESedeKeySpec
All Implemented Interfaces:
KeySpec
public class DESedeKeySpec extends Object implements KeySpec
This class specifies a DES-EDE ("triple-DES") key.
Since:
1.4

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final int
    DES_EDE_KEY_LEN
    The constant which defines the length of a DESede key in bytes.

  • Constructor Summary

    Constructors
    Constructor
    Description
    DESedeKeySpec(byte[] key)
    Creates a DESedeKeySpec object using the first 24 bytes in key as the key material for the DES-EDE key.
    DESedeKeySpec(byte[] key, int offset)
    Creates a DESedeKeySpec object using the first 24 bytes in key, beginning at offset inclusive, as the key material for the DES-EDE key.

  • Method Summary

    Modifier and Type
    Method
    Description
    byte[]
    getKey()
    Returns the DES-EDE key.
    static boolean
    isParityAdjusted(byte[] key, int offset)
    Checks if the given DES-EDE key, starting at offset inclusive, is parity-adjusted.

    Methods declared in class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    Modifier and Type
    Method
    Description
    protected Object
    clone()
    Creates and returns a copy of this object.
    boolean
    equals(Object obj)
    Indicates whether some other object is "equal to" this one.
    protected void
    finalize()
    Deprecated, for removal: This API element is subject to removal in a future version.
    Finalization is deprecated and subject to removal in a future release.
    final Class<?>
    getClass()
    Returns the runtime class of this Object.
    int
    hashCode()
    Returns a hash code value for this object.
    final void
    notify()
    Wakes up a single thread that is waiting on this object's monitor.
    final void
    notifyAll()
    Wakes up all threads that are waiting on this object's monitor.
    String
    toString()
    Returns a string representation of the object.
    final void
    wait()
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
    final void
    wait(long timeoutMillis)
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
    final void
    wait(long timeoutMillis, int nanos)
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

  • Field Details

    • DES_EDE_KEY_LEN

      public static final int DES_EDE_KEY_LEN
      The constant which defines the length of a DESede key in bytes.
      See Also:

  • Constructor Details

    • DESedeKeySpec

      public DESedeKeySpec(byte[] key) throws InvalidKeyException
      Creates a DESedeKeySpec object using the first 24 bytes in key as the key material for the DES-EDE key.

      The bytes that constitute the DES-EDE key are those between key[0] and key[23] inclusive

      Parameters:
      key - the buffer with the DES-EDE key material. The first 24 bytes of the buffer are copied to protect against subsequent modification.
      Throws:
      NullPointerException - if key is null.
      InvalidKeyException - if the given key material is shorter than 24 bytes.

    • DESedeKeySpec

      public DESedeKeySpec(byte[] key, int offset) throws InvalidKeyException
      Creates a DESedeKeySpec object using the first 24 bytes in key, beginning at offset inclusive, as the key material for the DES-EDE key.

      The bytes that constitute the DES-EDE key are those between key[offset] and key[offset+23] inclusive.

      Parameters:
      key - the buffer with the DES-EDE key material. The first 24 bytes of the buffer beginning at offset inclusive are copied to protect against subsequent modification.
      offset - the offset in key, where the DES-EDE key material starts.
      Throws:
      NullPointerException - if key is null.
      InvalidKeyException - if the given key material, starting at offset inclusive, is shorter than 24 bytes

  • Method Details

    • getKey

      public byte[] getKey()
      Returns the DES-EDE key.
      Returns:
      the DES-EDE key. Returns a new array each time this method is called.

    • isParityAdjusted

      public static boolean isParityAdjusted(byte[] key, int offset) throws InvalidKeyException
      Checks if the given DES-EDE key, starting at offset inclusive, is parity-adjusted.
      Parameters:
      key - a byte array which holds the key value
      offset - the offset into the byte array
      Returns:
      true if the given DES-EDE key is parity-adjusted, false otherwise
      Throws:
      NullPointerException - if key is null.
      InvalidKeyException - if the given key material, starting at offset inclusive, is shorter than 24 bytes