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Added in API level 1

Summary: Constants | Ctors | Methods | Inherited Methods | [Expand All]

DESKeySpec

public class DESKeySpec
extends Object implements KeySpec

java.lang.Object
	javax.crypto.spec.DESKeySpec

这个类指定了一个DES密钥。

摘要(Summary)

常量(Constants)
`int`	`DES_KEY_LEN` 以字节为单位定义DES密钥长度的常量。

Public constructors
`DESKeySpec(byte[] key)` 创建使用前8个字节中一个DESKeySpec对象， `key`作为DES密钥的密钥材料。
`DESKeySpec(byte[] key, int offset)` 创建使用前8个字节中一个DESKeySpec对象， `key` ，在开始 `offset`以下，作为DES密钥的密钥材料。

公共方法(Public methods)
`byte[]`	`getKey()` 返回DES密钥材料。
`static boolean`	`isParityAdjusted(byte[] key, int offset)` 检查从 `offset`开始的给定DES密钥材料是否进行了奇偶校验。
`static boolean`	`isWeak(byte[] key, int offset)` 检查给定的DES密钥材料是弱还是半弱。

继承方法(Inherited methods)

From class java.lang.Object

常量(Constants)

DES_KEY_LEN

Added in API level 1

int DES_KEY_LEN

以字节为单位定义DES密钥长度的常量。

常量值：8（0x00000008）

Public constructors

DESKeySpec

Added in API level 1

DESKeySpec (byte[] key)

创建使用前8个字节中一个DESKeySpec对象， key作为DES密钥的密钥材料。

构成DES密钥的字节是 key[0]和 key[7]之间的那些字节。

参数(Parameters)
`key`	`byte`: the buffer with the DES key material. The first 8 bytes of the buffer are copied to protect against subsequent modification.

抛出异常(Throws)
`NullPointerException`	if the given key material is `null`
`InvalidKeyException`	if the given key material is shorter than 8 bytes.

DESKeySpec

Added in API level 1

DESKeySpec (byte[] key, 
                int offset)

创建使用前8个字节中一个DESKeySpec对象， key ，在开始 offset以下，作为DES密钥的密钥材料。

构成DES密钥的字节是 key[offset]和 key[offset+7]之间的字节。

参数(Parameters)
`key`	`byte`: 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`	`int`: the offset in `key`, where the DES key material starts.

抛出异常(Throws)
`NullPointerException`	if the given key material is `null`
`InvalidKeyException`	if the given key material, starting at `offset` inclusive, is shorter than 8 bytes.

公共方法(Public methods)

getKey

Added in API level 1

byte[] getKey ()

返回DES密钥材料。

返回(Returns)
`byte[]`	the DES key material. Returns a new array each time this method is called.

isParityAdjusted

Added in API level 1

boolean isParityAdjusted (byte[] key, 
                int offset)

检查从 offset开始的给定DES密钥材料是否进行了奇偶校验。

参数(Parameters)
`key`	`byte`: the buffer with the DES key material.
`offset`	`int`: the offset in `key`, where the DES key material starts.

返回(Returns)
`boolean`	true if the given DES key material is parity-adjusted, false otherwise.

抛出异常(Throws)
`InvalidKeyException`	if the given key material is `null`, or starting at `offset` inclusive, is shorter than 8 bytes.

isWeak

Added in API level 1

boolean isWeak (byte[] key, 
                int offset)

检查给定的DES密钥材料是弱还是半弱。

参数(Parameters)
`key`	`byte`: the buffer with the DES key material.
`offset`	`int`: the offset in `key`, where the DES key material starts.

返回(Returns)
`boolean`	true if the given DES key material is weak or semi-weak, false otherwise.

抛出异常(Throws)
`InvalidKeyException`	if the given key material is `null`, or starting at `offset` inclusive, is shorter than 8 bytes.