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class:DESKeySpec [NONE]
All Implemented Interfaces:
KeySpec
public class DESKeySpecextends Object implements KeySpec
This class specifies a DES key.
Since:
1.4

field:DES_KEY_LEN [NONE]

  • DES_KEY_LEN

    public static final  int DES_KEY_LEN
    The constant which defines the length of a DES key in bytes.
    See Also:

constructor:DESKeySpec(byte[]) [NONE]

  • DESKeySpec

    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 - the buffer with the DES key material. The first 8 bytes of the buffer are copied to protect against subsequent modification.
    Throws:
    NullPointerException - if the given key material is null
    InvalidKeyException - if the given key material is shorter than 8 bytes.

    • constructor:DESKeySpec(byte[],int) [NONE]

    DESKeySpec

    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 - 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 - the offset in key, where the DES key material starts.
    Throws:
    NullPointerException - if the given key material is null
    InvalidKeyException - if the given key material, starting at offset inclusive, is shorter than 8 bytes.

    method:getKey() [NONE]

  • getKey

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

    • method:isParityAdjusted(byte[],int) [NONE]

    isParityAdjusted

    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 - the buffer with the DES key material.
    offset - the offset in key, where the DES key material starts.
    Returns:
    true if the given DES key material is parity-adjusted, false otherwise.
    Throws:
    InvalidKeyException - if the given key material is null, or starting at offset inclusive, is shorter than 8 bytes.

    method:isWeak(byte[],int) [NONE]

    isWeak

    public static  boolean isWeak (byte[] key, int offset) throws InvalidKeyException
    Checks if the given DES key material is weak or semi-weak.
    Parameters:
    key - the buffer with the DES key material.
    offset - the offset in key, where the DES key material starts.
    Returns:
    true if the given DES key material is weak or semi-weak, false otherwise.
    Throws:
    InvalidKeyException - if the given key material is null, or starting at offset inclusive, is shorter than 8 bytes.

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