org.gudy.bouncycastle.crypto.params
Class DESParameters

java.lang.Object
  org.gudy.bouncycastle.crypto.params.KeyParameter
      org.gudy.bouncycastle.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.gudy.bouncycastle.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.