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DESKeySpec

public class DESKeySpec
extends Object implements KeySpec

java.lang.Object
↳	javax.crypto.spec.DESKeySpec

This class specifies a DES key.

Summary

Constants
`int`	`DES_KEY_LEN` The constant which defines the length of a DES key in bytes.

Public constructors
`DESKeySpec(byte[] key)` Creates a DESKeySpec object using the first 8 bytes in `key` as the key material for the DES key.
`DESKeySpec(byte[] key, int offset)` Creates a DESKeySpec object using the first 8 bytes in `key`, beginning at `offset` inclusive, as the key material for the DES key.

Public methods
`byte[]`	`getKey()` Returns the DES key material.
`static boolean`	`isParityAdjusted(byte[] key, int offset)` Checks if the given DES key material, starting at `offset` inclusive, is parity-adjusted.
`static boolean`	`isWeak(byte[] key, int offset)` Checks if the given DES key material is weak or semi-weak.

Inherited methods

From class


        
          java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the 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(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void`	`wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void`	`wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

Constants

DES_KEY_LEN

public static final int DES_KEY_LEN

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

Constant Value: 8 (0x00000008)

Public constructors

DESKeySpec

public DESKeySpec (byte[] key)

Creates a DESKeySpec object using the first 8 bytes in key as the key material for the DES key.

The bytes that constitute the DES key are those between key[0] and key[7] inclusive.

Parameters
`key`	`byte`: the buffer with the DES key material. The first 8 bytes of the buffer are copied to protect against subsequent modification.

Throws
`NullPointerException`	if the given key material is `null`
`InvalidKeyException`	if the given key material is shorter than 8 bytes.

DESKeySpec

public DESKeySpec (byte[] key, 
                int offset)

Creates a DESKeySpec object using the first 8 bytes in key, beginning at offset inclusive, as the key material for the DES key.

The bytes that constitute the DES key are those between key[offset] and key[offset+7] inclusive.

Parameters
`key`	`byte`: the buffer with the DES key material. The first 8 bytes of the buffer beginning at `offset` inclusive are copied to protect against subsequent modification.
`offset`	`int`: the offset in `key`, where the DES key material starts.

Throws
`NullPointerException`	if the given key material is `null`
`InvalidKeyException`	if the given key material, starting at `offset` inclusive, is shorter than 8 bytes.

Public methods

getKey

public byte[] getKey ()

Returns the DES key material.

Returns
`byte[]`	the DES key material. Returns a new array each time this method is called.

isParityAdjusted

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

Checks if the given DES key material, starting at offset inclusive, is parity-adjusted.

Parameters
`key`	`byte`: the buffer with the DES key material.
`offset`	`int`: the offset in `key`, where the DES key material starts.

Returns
`boolean`	true if the given DES key material is parity-adjusted, false otherwise.

Throws
`InvalidKeyException`	if the given key material is `null`, or starting at `offset` inclusive, is shorter than 8 bytes.

isWeak

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

Checks if the given DES key material is weak or semi-weak.

Parameters
`key`	`byte`: the buffer with the DES key material.
`offset`	`int`: the offset in `key`, where the DES key material starts.

Returns
`boolean`	true if the given DES key material is weak or semi-weak, false otherwise.

Throws
`InvalidKeyException`	if the given key material is `null`, or starting at `offset` inclusive, is shorter than 8 bytes.

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DESKeySpec

Summary

Constants

Public constructors

Public methods

Inherited methods

Constants

DES_KEY_LEN

Public constructors

DESKeySpec

DESKeySpec

Public methods

getKey

isParityAdjusted

isWeak