javax.crypto.spec
Class DESKeySpec
- KeySpec
This class is a transparent wrapper for DES keys, which are arrays
of 8 bytes.
static int | DES_KEY_LEN- The length of a DES key, in bytes.
|
DESKeySpec(byte[] key)- Create a new DES key spec, copying the first 8 bytes from the
byte array.
|
DESKeySpec(byte[] key, int offset)- Create a new DES key spec, starting at
offset in
the byte array.
|
byte[] | getKey()- Return the key as a byte array.
|
static boolean | isParityAdjusted(byte[] key, int offset)- Returns whether or not the given key is parity adjusted;
i.e. every byte in the key has an odd number of "1" bits.
|
static boolean | isWeak(byte[] key, int offset)- Tests if the bytes between
[offset, offset+7]
constitute a weak or semi-weak DES key.
|
clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
DES_KEY_LEN
public static final int DES_KEY_LEN
The length of a DES key, in bytes.
DESKeySpec
public DESKeySpec(byte[] key,
int offset)
throws InvalidKeyException Create a new DES key spec, starting at offset in
the byte array. The first 8 bytes starting at offset
are copied.
key - The key bytes.offset - The offset into the byte array at which to begin.
getKey
public byte[] getKey()
Return the key as a byte array. This method does not copy the byte
array.
isParityAdjusted
public static boolean isParityAdjusted(byte[] key,
int offset)
throws InvalidKeyException Returns whether or not the given key is parity adjusted;
i.e. every byte in the key has an odd number of "1" bits.
key - The key bytes, considered between [offset,
offset+7]offset - The offset into the byte array at which to begin.
- True if all bytes have an odd number of "1" bits.
isWeak
public static boolean isWeak(byte[] key,
int offset)
throws InvalidKeyException Tests if the bytes between [offset, offset+7]
constitute a weak or semi-weak DES key.
key - The key bytes to check.offset - The offset in the byte array to start.
- true If the key bytes are a weak key.
DESKeySpec -- Keys for DES.
Copyright (C) 2004 Free Software Foundation, Inc.
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