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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。

Summary

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。

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。

Inherited methods
From class java.lang.Object

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。

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

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.
Throws
NullPointerException if the given key material is null
InvalidKeyException if the given key material, starting at offset inclusive, is shorter than 8 bytes.

Public methods

getKey

Added in API level 1 
byte[] getKey ()

返回DES密钥材料。

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。

Parameters
key byte: the buffer with the DES key material.
offset int: the offset in key, where the DES key material starts.
Returns
boolean true if the given DES key material is parity-adjusted, false otherwise.
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。

Parameters
key byte: the buffer with the DES key material.
offset int: the offset in key, where the DES key material starts.
Returns
boolean true if the given DES key material is weak or semi-weak, false otherwise.
Throws
InvalidKeyException if the given key material is null, or starting at offset inclusive, is shorter than 8 bytes.
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