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JavaTM 2 Platform Standard Ed. 5.0 |
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java.lang.Object extended by javax.crypto.spec.DESKeySpec
This class specifies a DES key.
| Field Summary | |
|---|---|
static int |
DES_KEY_LEN
The constant which defines the length of a DES key in bytes. |
| Constructor Summary | |
|---|---|
DESKeySpec(byte[] key)
Creates a DESKeySpec object using the first 8 bytes in key as the key material for the DES key. |
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DESKeySpec(byte[] key,
int offset)
Creates a DESKeySpec object using the first 8 bytes in key, beginning at offset inclusive,
as the key material for the DES key. |
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| Method Summary | |
|---|---|
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 |
|---|
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 as the key material for the DES key.
The bytes that constitute the DES key are those between
key[0] and key[7] inclusive.
key - the buffer with the DES key material. The first 8 bytes
of the buffer are copied to protect against subsequent modification.
NullPointerException - if the given key material is
null
InvalidKeyException - if the given key material is shorter
than 8 bytes.public DESKeySpec(byte[] key, int offset) throws InvalidKeyException
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.
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.
NullPointerException - if the given key material is
null
InvalidKeyException - if the given key material, starting at
offset inclusive, is shorter than 8 bytes.| Method Detail |
|---|
public byte[] getKey()
public static boolean isParityAdjusted(byte[] key, int offset) throws InvalidKeyException
offset
inclusive, is parity-adjusted.
key - the buffer with the DES key material.offset - the offset in key, where the DES key
material starts.
InvalidKeyException - if the given key material is
null, or starting at offset inclusive, is
shorter than 8 bytes.public static boolean isWeak(byte[] key, int offset) throws InvalidKeyException
key - the buffer with the DES key material.offset - the offset in key, where the DES key
material starts.
InvalidKeyException - if the given key material is
null, or starting at offset inclusive, is
shorter than 8 bytes.
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JavaTM 2 Platform Standard Ed. 5.0 |
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