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java.lang.Objectjavax.crypto.spec.DESKeySpec
public class DESKeySpec
This class is a transparent wrapper for DES keys, which are arrays of 8 bytes.
Field Summary | |
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static int |
DES_KEY_LEN
The length of a DES key, in bytes. |
Constructor Summary | |
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DESKeySpec(byte[] key)
Create a new DES key spec, copying the first 8 bytes from the byte array. |
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DESKeySpec(byte[] key,
int offset)
Create a new DES key spec, starting at offset in
the byte array. |
Method Summary | |
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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. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final int DES_KEY_LEN
Constructor Detail |
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public DESKeySpec(byte[] key) throws InvalidKeyException
key
- The key bytes.
InvalidKeyException
- If there are less than 8
bytes in the array.public DESKeySpec(byte[] key, int offset) throws InvalidKeyException
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.
InvalidKeyException
- If there are less than 8
bytes starting at offset
.Method Detail |
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public static boolean isParityAdjusted(byte[] key, int offset) throws InvalidKeyException
key
- The key bytes, considered between [offset,
offset+7]
offset
- The offset into the byte array at which to begin.
InvalidKeyException
- If there are not enough
bytes in the array.public static boolean isWeak(byte[] key, int offset) throws InvalidKeyException
[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.
InvalidKeyException
public byte[] getKey()
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