OpenJDK 27 · javax.crypto.spec.DESKeySpec · APIdia, the JavaDoc alternative

Modifier and Type	Field and Description
public static final int	DES_KEY_LEN The constant which defines the length of a DES key in bytes.
private final byte[]	key
private static final byte[][]	WEAK_KEYS

Constructor Summary

Access	Constructor and Description
public	DESKeySpec(byte[] the buffer with the DES key material. The first 8 bytes of the buffer are copied to protect against subsequent modification. key) Creates a DESKeySpec object using the first 8 bytes in `key` as the key material for the DES key.
public	DESKeySpec(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. key, int the offset in `key`, where the DES key material starts. offset) Creates a DESKeySpec object using the first 8 bytes in `key`, beginning at `offset` inclusive, as the key material for the DES key.

Method Summary

Modifier and Type	Method and Description
public byte[]	Returns: the DES key material. Returns a new array each time this method is called. getKey() Returns the DES key material.
public static boolean	Returns: true if the given DES key material is parity-adjusted, false otherwise. isParityAdjusted(byte[] the buffer with the DES key material. key, int the offset in `key`, where the DES key material starts. offset) Checks if the given DES key material, starting at `offset` inclusive, is parity-adjusted.
public static boolean	Returns: true if the given DES key material is weak or semi-weak, false otherwise. isWeak(byte[] the buffer with the DES key material. key, int the offset in `key`, where the DES key material starts. offset) Checks if the given DES key material is weak or semi-weak.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

Field Detail

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

key	back to summary
private final byte[] key

WEAK_KEYS	back to summary
private static final byte[][] WEAK_KEYS

Constructor Detail

DESKeySpec back to summary

DESKeySpec	back to summary
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:byte[] the buffer with the DES key material. The first 8 bytes of the buffer are copied to protect against subsequent modification. Exceptions InvalidKeyException: if the given key material is shorter than 8 bytes. NullPointerException: if the given key material is `null`.

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

Exceptions

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

DESKeySpec back to summary

DESKeySpec	back to summary
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: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. Exceptions InvalidKeyException: if the given key material, starting at `offset` inclusive, is shorter than 8 bytes. NullPointerException: if the given key material is `null`. ArrayIndexOutOfBoundsException: if `offset` is negative.

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: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.

Exceptions

InvalidKeyException:: if the given key material, starting at offset inclusive, is shorter than 8 bytes.
NullPointerException:: if the given key material is null.
ArrayIndexOutOfBoundsException:: if offset is negative.

Method Detail

getKey	back to summary
public byte[] getKey() Returns the DES key material. Returns:byte[] the DES key material. Returns a new array each time this method is called.

getKey

back to summary

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 back to summary

isParityAdjusted	back to summary
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: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. Exceptions InvalidKeyException: if the given key material is `null`, or starting at `offset` inclusive, is shorter than 8 bytes. ArrayIndexOutOfBoundsException: if `offset` is negative.

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: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.

Exceptions

InvalidKeyException:: if the given key material is null, or starting at offset inclusive, is shorter than 8 bytes.
ArrayIndexOutOfBoundsException:: if offset is negative.

isWeak back to summary

isWeak	back to summary
public static boolean isWeak(byte[] key, int offset) throws InvalidKeyException 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. Exceptions InvalidKeyException: if the given key material is `null`, or starting at `offset` inclusive, is shorter than 8 bytes. ArrayIndexOutOfBoundsException: if `offset` is negative.

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

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.

Exceptions

InvalidKeyException:: if the given key material is null, or starting at offset inclusive, is shorter than 8 bytes.
ArrayIndexOutOfBoundsException:: if offset is negative.

public Class DESKeySpec

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