Package Summary Overview Summary

class:DESKeySpec [NONE]

All Implemented Interfaces:

KeySpec
```
public class DESKeySpec
extends Object
implements KeySpec
```
This class specifies a DES key.

Since:

1.4

field:DES_KEY_LEN [NONE]

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

See Also:

Constant Field Values

constructor:<init>(byte[]) [NONE]

DESKeySpec
```
public DESKeySpec(byte[] key)
           throws InvalidKeyException
```
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 - 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.

constructor:<init>(byte[],int) [NONE]

DESKeySpec
```
public DESKeySpec(byte[] key,
                  int offset)
           throws InvalidKeyException
```
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 - 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 - 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.

method:getKey() [NONE]

getKey
```
public byte[] getKey()
```
Returns the DES key material.

Returns:

the DES key material. Returns a new array each time this method is called.

method:isParityAdjusted(byte[],int) [NONE]

isParityAdjusted
```
public static boolean isParityAdjusted(byte[] key,
                                       int offset)
                                throws InvalidKeyException
```
Checks if the given DES key material, starting at offset inclusive, is parity-adjusted.

Parameters:

key - the buffer with the DES key material.

offset - the offset in key, where the DES key material starts.

Returns:

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.

method:isWeak(byte[],int) [NONE]

isWeak
```
public static boolean isWeak(byte[] key,
                             int offset)
                      throws InvalidKeyException
```
Checks if the given DES key material is weak or semi-weak.

Parameters:

key - the buffer with the DES key material.

offset - the offset in key, where the DES key material starts.

Returns:

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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