SecretKeyFactorySpi

public abstract class SecretKeyFactorySpi
extends Object

java.lang.Object
↳	javax.crypto.SecretKeyFactorySpi

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.

See also:

Summary

Public constructors
`SecretKeyFactorySpi()`

Protected methods
`abstract SecretKey`	`engineGenerateSecret(KeySpec keySpec)` Generates a `SecretKey` object from the provided key specification (key material).
`abstract KeySpec`	`engineGetKeySpec(SecretKey key, Class<?> keySpec)` Returns a specification (key material) of the given key object in the requested format.
`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.

Inherited methods

From class


        
          java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeoutMillis, int nanos)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

Public constructors

SecretKeyFactorySpi

Added in API level 1

public SecretKeyFactorySpi ()

Protected methods

engineGenerateSecret

Added in API level 1

protected abstract SecretKey engineGenerateSecret (KeySpec keySpec)

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

Parameters
`keySpec`	`KeySpec`: the specification (key material) of the secret key

Returns
`SecretKey`	the secret key

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

engineGetKeySpec

Added in API level 1

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

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

Parameters
`key`	`SecretKey`: the key
`keySpec`	`Class`: the requested format in which the key material shall be returned

Returns
`KeySpec`	the underlying key specification (key material) in the requested format

Throws
`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

Added in API level 1

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.

Parameters
`key`	`SecretKey`: the key whose provider is unknown or untrusted

Returns
`SecretKey`	the translated key

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