Package org.bouncycastle.crypto.params

## Class DESParameters

- java.lang.Object
- - org.bouncycastle.crypto.params.KeyParameter
  - - org.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 int` | `DES_KEY_LENGTH` |

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `DESParameters​(byte[] key)` |

  - ### Method Summary

    All Methods Static Methods Concrete Methods
    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 org.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.