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()
    Answers a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
    boolean
    equals(Object o)
    Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
    protected void
    finalize()
    Deprecated, for removal: This API element is subject to removal in a future version.
    May cause performance issues, deadlocks and hangs.
    final Class<? extends Object>
    getClass()
    Answers the unique instance of java.lang.Class which represents the class of the receiver.
    int
    hashCode()
    Answers an integer hash code for the receiver.
    final void
    notify()
    Causes one thread which is waiting on the receiver to be made ready to run.
    final void
    notifyAll()
    Causes all threads which are waiting on the receiver to be made ready to run.
    String
    toString()
    Answers a string containing a concise, human-readable description of the receiver.
    final void
    wait()
    Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
    final void
    wait(long time)
    Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
    final void
    wait(long time, int frac)
    Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.

  • 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.
      ArrayIndexOutOfBoundsException - if offset is negative.

  • 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:
      InvalidKeyException - if the given key material is null, or starting at offset inclusive, is shorter than 24 bytes.
      ArrayIndexOutOfBoundsException - if offset is negative.