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javax.crypto.spec
Class DESKeySpec
java.lang.Object
javax.crypto.spec.DESKeySpec
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All Implemented Interfaces:
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KeySpec
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public class
DESKeySpec
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extends
Object
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implements
KeySpec
This class specifies a DES key.
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Since:
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1.4
Field Summary
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static int |
DES_KEY_LEN
The constant which defines the length of a DES key in bytes. |
Constructor Summary
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DESKeySpec
(byte[] key)
Creates a DESKeySpec object using
Uses
the first 8 bytes in key as the key material for the DES key. |
DESKeySpec
(byte[] key, int offset)
Creates a DESKeySpec object using
Uses
the first 8 bytes in key, beginning at offset inclusive, as the key material for the DES key. |
Method Summary
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byte[] |
getKey
()
Returns the DES key material. |
static boolean |
isParityAdjusted
(byte[] key, int offset)
Checks if the given DES key material, starting at offset inclusive, is parity-adjusted. |
static boolean |
isWeak
(byte[] key, int offset)
Checks if the given DES key material is weak or semi-weak. |
Methods inherited from class java.lang.
Object
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clone
,
equals
,
finalize
,
getClass
,
hashCode
,
notify
,
notifyAll
,
toString
,
wait
,
wait
,
wait
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DES_KEY_LEN
public static final int DES_KEY_LEN
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The constant which defines the length of a DES key in bytes.
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See Also:
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Constant Field Values
DESKeySpec
public DESKeySpec(byte[] key)
throws InvalidKeyException
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Creates a DESKeySpec object using
Uses
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.
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Parameters:
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key - the buffer with the DES key material.
The first 8 bytes of the buffer are copied to protect against subsequent modification.
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Throws:
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InvalidKeyException
- if the given key material is shorter than 8 bytes.
DESKeySpec
public DESKeySpec(byte[] key,
int offset)
throws InvalidKeyException
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Creates a DESKeySpec object using
Uses
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.
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Parameters:
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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.
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offset - the offset in key, where the DES key material starts.
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Throws:
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InvalidKeyException
- if the given key material, starting at offset inclusive, is shorter than 8 bytes.
getKey
public byte[] getKey()
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Returns the DES key material.
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Returns:
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the DES key material.
Returns a new array each time this method is called.
isParityAdjusted
public static boolean isParityAdjusted(byte[] key,
int offset)
throws InvalidKeyException
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Checks if the given DES key material, starting at offset inclusive, is parity-adjusted.
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Parameters:
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key - the buffer with the DES key material.
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offset - the offset in key, where the DES key material starts.
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Returns:
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true if the given DES key material is parity-adjusted, false otherwise.
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Throws:
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InvalidKeyException
- if the given key material, starting at offset inclusive, is shorter than 8 bytes.
isWeak
public static boolean isWeak(byte[] key,
int offset)
throws InvalidKeyException
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Checks if the given DES key material is weak or semi-weak.
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Parameters:
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key - the buffer with the DES key material.
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offset - the offset in key, where the DES key material starts.
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Returns:
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true if the given DES key material is weak or semi-weak, false otherwise.
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Throws:
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InvalidKeyException
- if the given key material, starting at offset inclusive, is shorter than 8 bytes.