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

Fields

Modifier and Type

Field

Description

static final int

DES_KEY_LENGTH

private static byte[]

DES_weak_keys

private static final int

N_DES_WEAK_KEYS
Constructor Summary

Constructors

Constructor

Description

DESParameters(byte[] key)
Method Summary

Modifier and Type

Method

Description

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 KeyParameter
getKey

Methods inherited from class Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details
- DES_KEY_LENGTH
  public static final int DES_KEY_LENGTH
  
  See Also:
  
  Constant Field Values
- N_DES_WEAK_KEYS
  private static final int N_DES_WEAK_KEYS
  
  See Also:
  
  Constant Field Values
- DES_weak_keys
  
  private static byte[] DES_weak_keys
Constructor Details
- DESParameters
  
  public DESParameters(byte[] key)
Method Details
- 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.