KeySpecpublic class DESKeySpec extends Object implements KeySpec
| Modifier and Type | Field | Description |
|---|---|---|
static final int |
DES_KEY_LEN |
The constant which defines the length of a DES key in bytes. |
| Constructor | Description |
|---|---|
DESKeySpec |
Creates a DESKeySpec object using the first 8 bytes in key as the key material for the DES key. |
DESKeySpec |
Creates a DESKeySpec object using the first 8 bytes in key, beginning at offset inclusive, as the key material for the DES key. |
| Modifier and Type | Method | Description |
|---|---|---|
byte[] |
getKey() |
Returns the DES key material. |
static boolean |
isParityAdjusted |
Checks if the given DES key material, starting at offset inclusive, is parity-adjusted. |
static boolean |
isWeak |
Checks if the given DES key material is weak or semi-weak. |
public static final int DES_KEY_LEN
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.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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https://docs.oracle.com/en/java/javase/21/docs/api/java.base/javax/crypto/spec/DESKeySpec.html