程序包 javax.crypto

类 SecretKeyFactorySpi

java.lang.Object

javax.crypto.SecretKeyFactorySpi

public abstract class SecretKeyFactorySpi
extends Object

This class defines the Service Provider Interface (SPI) for the SecretKeyFactory class. All the abstract methods in this class must be implemented by each cryptographic service provider who wishes to supply the implementation of a secret-key factory for a particular algorithm.

A provider should document all the key specifications supported by its secret key factory. For example, the DES secret-key factory supplied by the "SunJCE" provider supports DESKeySpec as a transparent representation of DES keys, and that provider's secret-key factory for Triple DES keys supports DESedeKeySpec as a transparent representation of Triple DES keys.

从以下版本开始:

1.4

另请参阅:

SecretKey, DESKeySpec, DESedeKeySpec

构造器概要

构造器

构造器	说明
SecretKeyFactorySpi()

方法概要

限定符和类型	方法	说明
protected abstract SecretKey	engineGenerateSecret(KeySpec keySpec)	Generates a SecretKey object from the provided key specification (key material).
protected abstract KeySpec	engineGetKeySpec(SecretKey key, Class<?> keySpec)	Returns a specification (key material) of the given key object in the requested format.
protected abstract SecretKey	engineTranslateKey(SecretKey key)	Translates a key object, whose provider may be unknown or potentially untrusted, into a corresponding key object of this secret-key factory.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

SecretKeyFactorySpi

public SecretKeyFactorySpi()

方法详细资料

engineGenerateSecret

protected abstract SecretKey engineGenerateSecret(KeySpec keySpec)
                                           throws InvalidKeySpecException

Generates a SecretKey object from the provided key specification (key material).

参数:

keySpec - the specification (key material) of the secret key

返回:

the secret key

抛出:

InvalidKeySpecException - if the given key specification is inappropriate for this secret-key factory to produce a secret key.

engineGetKeySpec

protected abstract KeySpec engineGetKeySpec(SecretKey key,
                                            Class<?> keySpec)
                                     throws InvalidKeySpecException

Returns a specification (key material) of the given key object in the requested format.

参数:

key - the key

keySpec - the requested format in which the key material shall be returned

返回:

the underlying key specification (key material) in the requested format

抛出:

InvalidKeySpecException - if the requested key specification is inappropriate for the given key (e.g., the algorithms associated with key and keySpec do not match, or key references a key on a cryptographic hardware device whereas keySpec is the specification of a software-based key), or the given key cannot be dealt with (e.g., the given key has an algorithm or format not supported by this secret-key factory).

engineTranslateKey

protected abstract SecretKey engineTranslateKey(SecretKey key)
                                         throws InvalidKeyException

Translates a key object, whose provider may be unknown or potentially untrusted, into a corresponding key object of this secret-key factory.

参数:

key - the key whose provider is unknown or untrusted

返回:

the translated key

抛出:

InvalidKeyException - if the given key cannot be processed by this secret-key factory.