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。
常量(Constants) |
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int |
DES_EDE_KEY_LEN 以字节为单位定义DESede密钥长度的常量。 |
Public constructors |
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DESedeKeySpec(byte[] key) 创建使用前24个字节在一个DESedeKeySpec对象, |
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DESedeKeySpec(byte[] key, int offset) 创建使用前24个字节在一个DESedeKeySpec对象, |
公共方法(Public methods) |
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byte[] |
getKey() 返回DES-EDE密钥。 |
static boolean |
isParityAdjusted(byte[] key, int offset) 检查从 |
继承方法(Inherited methods) |
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![]() java.lang.Object
|
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
参数(Parameters) | |
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key |
byte : the buffer with the DES-EDE key material. The first 24 bytes of the buffer are copied to protect against subsequent modification. |
抛出异常(Throws) | |
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NullPointerException |
if key is null. |
InvalidKeyException |
if the given key material is shorter than 24 bytes. |
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]
。
参数(Parameters) | |
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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. |
抛出异常(Throws) | |
---|---|
NullPointerException |
if key is null. |
InvalidKeyException |
if the given key material, starting at offset inclusive, is shorter than 24 bytes |
byte[] getKey ()
返回DES-EDE密钥。
返回(Returns) | |
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byte[] |
the DES-EDE key. Returns a new array each time this method is called. |
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。
参数(Parameters) | |
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key |
byte : a byte array which holds the key value |
offset |
int : the offset into the byte array |
返回(Returns) | |
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boolean |
true if the given DES-EDE key is parity-adjusted, false otherwise |
抛出异常(Throws) | |
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NullPointerException |
if key is null. |
InvalidKeyException |
if the given key material, starting at offset inclusive, is shorter than 24 bytes |