public class

DESedeKeySpec

extends Object
implements KeySpec
java.lang.Object
   ↳ javax.crypto.spec.DESedeKeySpec

Class Overview

This class specifies a DES-EDE ("triple-DES") key.

Summary

Constants
int DES_EDE_KEY_LEN The constant which defines the length of a DESede key in bytes.
Public Constructors
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.
Public Methods
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.
[Expand]
Inherited Methods
From class java.lang.Object

Constants

public static final int DES_EDE_KEY_LEN

The constant which defines the length of a DESede key in bytes.

Constant Value: 24 (0x00000018)

Public Constructors

public DESedeKeySpec (byte[] key)

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.

public 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.

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

Public Methods

public byte[] getKey ()

Returns the DES-EDE key.

Returns
  • the DES-EDE key. Returns a new array each time this method is called.

public static boolean isParityAdjusted (byte[] key, int offset)

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