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Added in API level 1

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

public class DESedeKeySpec
extends Object implements KeySpec

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

该类指定了DES-EDE（“triple-DES”）密钥。

Constants
`int`	`DES_EDE_KEY_LEN` 以字节为单位定义DESede密钥长度的常量。

Public constructors
`DESedeKeySpec(byte[] key)` 创建使用前24个字节在一个DESedeKeySpec对象， `key`作为DES-EDE密钥的密钥材料。
`DESedeKeySpec(byte[] key, int offset)` 创建使用前24个字节在一个DESedeKeySpec对象， `key` ，在开始 `offset`以下，作为DES-EDE密钥的密钥材料。

Public methods
`byte[]`	`getKey()` 返回DES-EDE密钥。
`static boolean`	`isParityAdjusted(byte[] key, int offset)` 检查从 `offset`开始的给定DES-EDE密钥是否是奇偶校验调整的。

From class java.lang.Object

Added in API level 1

int DES_EDE_KEY_LEN

以字节为单位定义DESede密钥长度的常量。

常量值：24（0x00000018）

Added in API level 1

DESedeKeySpec (byte[] key)

创建使用前24个字节在一个DESedeKeySpec对象， key作为DES-EDE密钥的密钥材料。

构成DES-EDE密钥的字节是 key[0]和 key[23]之间的那些字节

Parameters
`key`	`byte`: the buffer with the DES-EDE key material. The first 24 bytes of the buffer are copied to protect against subsequent modification.

Throws
`NullPointerException`	if `key` is null.
`InvalidKeyException`	if the given key material is shorter than 24 bytes.

Added in API level 1

DESedeKeySpec (byte[] key, 
                int offset)

创建使用前24个字节在一个DESedeKeySpec对象， key ，在开始 offset以下，作为DES-EDE密钥的密钥材料。

构成DES-EDE密钥的字节是 key[offset]和 key[offset+23]之间的 key[offset] 。

Parameters
`key`	`byte`: the buffer with the DES-EDE key material. The first 24 bytes of the buffer beginning at `offset` inclusive are copied to protect against subsequent modification.
`offset`	`int`: the offset in `key`, where the DES-EDE key material starts.

Throws
`NullPointerException`	if `key` is null.
`InvalidKeyException`	if the given key material, starting at `offset` inclusive, is shorter than 24 bytes

Added in API level 1

byte[] getKey ()

返回DES-EDE密钥。

Returns
`byte[]`	the DES-EDE key. Returns a new array each time this method is called.

Added in API level 1

boolean isParityAdjusted (byte[] key, 
                int offset)

检查从 offset开始的给定DES-EDE密钥是否是奇偶校验调整的。

Parameters
`key`	`byte`: a byte array which holds the key value
`offset`	`int`: the offset into the byte array

Returns
`boolean`	true if the given DES-EDE key is parity-adjusted, false otherwise

Throws
`NullPointerException`	if `key` is null.
`InvalidKeyException`	if the given key material, starting at `offset` inclusive, is shorter than 24 bytes