org.apache.geronimo.util.crypto.params
Class DESParameters

java.lang.Object
  org.apache.geronimo.util.crypto.params.KeyParameter
      org.apache.geronimo.util.crypto.params.DESParameters

All Implemented Interfaces:

CipherParameters

Direct Known Subclasses:

DESedeParameters

public class DESParameters
extends KeyParameter

Field Summary

static int

DES_KEY_LENGTH

Constructor Summary

DESParameters(byte[] key)

Method Summary

static boolean	isWeakKey(byte[] key, int offset) DES has 16 weak keys.
static void	setOddParity(byte[] bytes) DES Keys use the LSB as the odd parity bit.

Methods inherited from class org.apache.geronimo.util.crypto.params.KeyParameter

getKey

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DES_KEY_LENGTH

public static final int DES_KEY_LENGTH

See Also:

Constant Field Values

Constructor Detail

DESParameters

public DESParameters(byte[] key)

Method Detail

isWeakKey

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

DES has 16 weak keys. This method will check if the given DES key material is weak or semi-weak. Key material that is too short is regarded as weak.

See "Applied Cryptography" by Bruce Schneier for more information.

Returns:

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

setOddParity

public static void setOddParity(byte[] bytes)

DES Keys use the LSB as the odd parity bit. This can be used to check for corrupt keys.

Parameters:

bytes - the byte array to set the parity on.