DESedeKeySpec (Java Platform SE 6)

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Java^TM Platform
Standard Ed. 6

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javax.crypto.spec
�� DESedeKeySpec

java.lang.Object
  javax.crypto.spec.DESedeKeySpec

��ʵ�ֵĽӿڣ�: KeySpec

public class DESedeKeySpec
extends Object
implements KeySpec
extends Object
implements KeySpec

��ָ��һ�� DES-EDE ("triple-DES") ��Կ��

��°汾��ʼ��: 1.4

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`static int`	`DES_EDE_KEY_LEN` �� byte Ϊ��λ�� DESede ��Կ��ȵĳ��

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`DESedeKeySpec(byte[] key)` ��һ�� DESedeKeySpec ��ʹ�� `key` �е�ǰ 24 ��ֽ��Ϊ DES-EDE ��Կ��Կ��ݡ�
`DESedeKeySpec(byte[] key, int offset)` ��һ�� DESedeKeySpec ��ʹ�� `key` ��ʼ��Ұ�� `offset` ��ǰ 24 ��ֽ��Ϊ DES-EDE ��Կ��Կ��ݡ�

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`byte[]`	`getKey()` �� DES-EDE ��Կ��
`static boolean`	`isParityAdjusted(byte[] key, int offset)` ȷ��ʼ��Ұ�� `offset` �� DES-EDE ��Կ�Ƿ��żУ�� (parity-adjusted)��

�� java.lang.Object �̳еķ��
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

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DES_EDE_KEY_LEN

public static final int DES_EDE_KEY_LEN

�� byte Ϊ��λ�� DESede ��Կ��ȵĳ��

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DESedeKeySpec

public DESedeKeySpec(byte[] key)
              throws InvalidKeyException

��һ�� DESedeKeySpec ��ʹ�� key �е�ǰ 24 ��ֽ��Ϊ DES-EDE ��Կ��Կ��ݡ�

�� DES-EDE ��Կ��ֽ�� key[0] �� key[23] ��Χ�ڣ��ߣ�

��: key - �� DES-EDE ��Կ��ݵĻ��Ƹû��ǰ 24 ��ֽ��ֹ��޸ġ�
�׳��: NullPointerException - �� key Ϊ null��; InvalidKeyException - ��Կ��ݶ�� 24 ��ֽڡ�

DESedeKeySpec

public DESedeKeySpec(byte[] key,
                     int offset)
              throws InvalidKeyException

��һ�� DESedeKeySpec ��ʹ�� key ��ʼ��Ұ�� offset ��ǰ 24 ��ֽ��Ϊ DES-EDE ��Կ��Կ��ݡ�

�� DES-EDE ��Կ��ֽ�� key[offset] �� key[offset+23] ��Χ�ڣ��ߣ��

��: key - �� DES-EDE ��Կ��ݵĻ��Ƹû��ʼ��Ұ�� offset ��ǰ 24 ��ֽ��ֹ��޸ġ�; offset - key �е�ƫ��DES-EDE ��Կ��ݴӴ˴��ʼ��
�׳��: NullPointerException - �� key Ϊ null��; InvalidKeyException - ��ʼ��Ұ�� offset ��Կ��ݶ�� 24 ��ֽ�

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getKey

public byte[] getKey()

�� DES-EDE ��Կ��

��أ�: DES-EDE ��Կ��ÿһ�ε��ô˷��һ��顣

isParityAdjusted

public static boolean isParityAdjusted(byte[] key,
                                       int offset)
                                throws InvalidKeyException

ȷ��ʼ��Ұ�� offset �� DES-EDE ��Կ�Ƿ��żУ�� (parity-adjusted)��

��: key - ��Կֵ�� byte ��; offset - byte ��е�ƫ��
��أ�: �� DES-EDE ��Կ��żУ��ģ��򷵻� true��򷵻� false
�׳��: NullPointerException - �� key Ϊ null��; InvalidKeyException - ��ʼ��Ұ�� offset ��Կ��ݶ�� 24 ��ֽ�